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  rev.1.1 _00 step-up, super-small package, 1.2 mhz pwm control or pwm/pfm switchable switch ing regulator controller S-8365/8366 series seiko instruments inc. 1 the S-8365/8366 series is a cmos step-up switching regulator controller which mainly consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation circuit, a timer latch short-circuit protection circuit, a pwm control circuit (S-8365 series) and a pwm / pfm switching control circuit (s-8366 series). with an external low-on-resistance nch power mos, this product is ideal for applications requiring high efficiency and a high output current. the S-8365 series efficiently works on vo ltage?s condit ion of large i/o difference due to the pwm control circuit linearly varies the duty ratio to 90%. during light-load, the s-8366 series switch es its operation to the pfm control by the pwm / pfm switching control circuit in order to prevent efficiency decline due to the ic operating current. ceramic capacitors can be used for output capacitor. small packages snt-6a, sot-23-5 and sot-23-6 enable high-density mounting. ? features ? low operation voltage : start at 1.1 v (1 ma) guaranteed (in the product without uvlo function) ? input voltage range : 1.8 v to 5.5 v ? oscillation frequency : 1.2 mhz, 600 khz ? reference voltage : 0.6 v 2.0% ? soft start function : 7 ms typ. ? low current consumption : 70 a typ. at switching off ? duty ratio : built-in pwm / pfm switching control circuit (s-8366 series) 28% to 85% (1.2 mhz product) 28% to 90% (600 khz product) ? shutdown function : current consumption 1.0 a max. at shutdown ? external parts : inductor, diode, capacitor, transistor ? timer latch short-circuit protection circuit : selectable with / without short-circui t protection circuit for each product settable delay time by external capacitor (in the product with short-circuit protection) ? uvlo (under-voltage lockout) function : selectable with / without uvlo for each product ? small packages : snt-6a, sot-23-5, sot-23-6 ? lead-free product ? applications ? mp3 players, digital audio players ? digital cameras, gps, wireless transceiver ? portable devices ? packages drawing code package name package tape reel land snt-6a pg006-a pg006-a pg006-a pg006-a sot-23-5 mp005-a mp005-a mp005-a ? sot-23-6 mp006-a mp006-a mp006-a ?
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 2 ? block diagram 1. with uvlo function and short-circuit protection fb triangular wave oscillation circuit pwm comparator uvlo vss r fb1 r fb2 v out error amplifier v in c in ? + ? + timer latch short-circuit protection csp l c out on/off m1 vdd c fb ext sd on/off circuit pwm control, or pwm / pfm switching control circuit reference voltage with soft-start circuit figure 1 2. with uvlo function, without short-circuit protection fb triangular wave oscillation circuit pwm comparator uvlo on/off circuit vss r fb1 r fb2 v out error amplifier v in c in ? + ? + l c out m1 sd c fb on/off vdd ext pwm control, or pwm / pfm switching control circuit reference voltage with soft-start circuit figure 2
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 3 3. without uvlo and short-circuit protection fb pwm comparator vss r fb1 r fb2 v out error amplifier v in c in ? + ? + reference voltage with soft-start circuit l c out m1 sd c fb ic internal power supply vdd on/off ext on/off circuit triangular wave oscillation circuit pwm control, or pwm / pfm switching control circuit figure 3 caution to stabilize the output voltage and oscillation fre quency of the S-8365 /8366 series, the input voltage of 1.8 v v dd 5.5 v is necessary. when connecting the vout output to the vdd pin, set the input voltage (v out ) as to satisfy the above range, including the spike voltage generated in vout.
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 4 ? product name structure users can select the control system, os cillation frequency, short-circuit prot ection, uvlo function, packages for the S-8365/8366 series. refer to ? 1. product name ? regarding the contents of product name, ? 2. product list ? regarding the product type. 1. product name (1) snt-6a s-836 x a x x x x - i6t1 g2 package name (abbreviation) and ic packing specification *1 i6t1: snt-6a, tape off / on pin pull-down a: unavailable b: available uvlo function a: unavailable b: available short-circuit protection a: unavailable b: available oscillation frequency a: 1.2 mhz b: 600 khz control system 5: pwm control 6: pwm / pfm switching control *1. refer to the tape specification.
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 5 (2) sot-23-5, sot-23-6 s-836 x a x x x x - xxxx s2 package name (abbreviation) and ic packing specification *1 m5t1: sot-23-5, tape m6t1: sot-23-6, tape off / on pin pull-down a: unavailable b: available uvlo function a: unavailable b: available short-circuit protection a: unavailable (sot-23-5) b: available (sot-23-6) oscillation frequency a: 1.2 mhz b: 600 khz control system 5: pwm control 6: pwm / pfm switching control *1. refer to the tape specification.
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 6 2. product list (1) S-8365 series (pwm control) table 1 sot-23-5 sot-23-6 snt-6a oscillation frequency short-circuit protection uvlo function off / on pin pull-down ? S-8365aabba-m6t1s2 S-8365aabba-i6t1g2 1.2 mhz available available unavailable S-8365aaaba-m5t1s2 ? S-8365aaaba-i6t1g2 1.2 mhz unavailable available unavailable S-8365aaaaa-m5t1s2 ? S-8365aaaaa-i6t1g2 1.2 mhz unavailable unavailable unavailable ? S-8365abbba-m6t1s2 S-8365abbba-i6t1g2 600 khz available available unavailable S-8365ababa-m5t1s2 ? S-8365ababa-i6t1g2 600 khz unavailable available unavailable S-8365abaaa-m5t1s2 ? S-8365abaaa-i6t1g2 600 khz unavailable unavailable unavailable remark 1. contact our sales office for S-8365axbaa (witho ut uvlo function, with short-circuit protection). 2. contact our sales office for S-8365axxxb ( off on/ pin pull-down). (2) s-8366 series (pwm / pfm switching control) table 2 sot-23-5 sot-23-6 snt-6a oscillation frequency short-circuit protection uvlo function off / on pin pull-down ? s-8366aabba-m6t1s2 s-8366aabba-i6t1g2 1.2 mhz available available unavailable s-8366aaaba-m5t1s2 ? s-8366aaaba-i6t1g2 1.2 mhz unavailable available unavailable s-8366aaaaa-m5t1s2 ? s-8366aaaaa-i6t1g2 1.2 mhz unavailable unavailable unavailable ? s-8366abbba-m6t1s2 s-8366abbba-i6t1g2 600 khz available available unavailable s-8366ababa-m5t1s2 ? s-8366ababa-i6t1g2 600 khz unavailable available unavailable s-8366abaaa-m5t1s2 ? s-8366abaaa-i6t1g2 600 khz unavailable unavailable unavailable remark 1. contact our sales office for s-8366axbaa (witho ut uvlo function, with short-circuit protection). 2. contact our sales office for s-8366axxxb ( off on/ pin pull-down).
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 7 ? pin configurations table 3 with short-circuit protection pin no. symbol description 1 ext external transistor connection pin 2 vss gnd pin 3 off / on power-off pin ?h? : power-on (normal operation) ?l? : power-off (standby) 4 fb output voltage feedback pin snt-6a top view 1 2 3 4 6 5 5 csp delay time setting pin for short-circuit protection 6 vdd ic power supply pin figure 4 table 4 without short-circuit protection pin no. symbol description 1 ext external transistor connection pin 2 vss gnd pin 3 off / on power-off pin ?h? : power-on (normal operation) ?l? : power-off (standby) 4 fb output voltage feedback pin 5 nc *1 no connection 6 vdd ic power supply pin *1. the nc pin indicates electrically open. the nc pin can be connected to vdd or vss. table 5 without short-circuit protection pin no. symbol description 1 off / on power-off pin ?h? : power-on (normal operation) ?l? : power-off (standby) 2 vss gnd pin 3 ext external transistor connection pin 4 vdd ic power supply pin 5 fb output voltage feedback pin 5 4 1 3 2 sot-23-5 top vie w figure 5
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 8 table 6 with short-circuit protection pin no. symbol description 1 vdd ic power supply pin 2 csp delay time setting pin for short-circuit protection 3 fb output voltage feedback pin 4 off / on power-off pin ?h? : power-on (normal operation) ?l? : power-off (standby) 5 vss gnd pin 6 ext external transistor connection pin 6 4 1 3 2 sot-23-6 top view 5 figure 6
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 9 ? absolute maximum ratings table 7 absolute maximum ratings (ta = 25 c, v ss = 0 v unless otherwise specified) item symbol abso lute maximum ratings unit vdd pin voltage v dd v ss ? 0.3 to v ss + 6.0 v fb pin voltage v fb v ss ? 0.3 to v dd + 0.3 v ext pin voltage v ext v ss ? 0.3 to v dd + 0.3 v off on/ pin voltage off / on v v ss ? 0.3 to v dd + 0.3 v csp pin voltage v csp v ss ? 0.3 to v dd + 0.3 v snt-6a 400 *1 mw sot-23-5 600 *1 mw power dissipation sot-23-6 p d 650 *1 mw operating ambient temperature t opr ? 40 to + 85 c storage temperature t stg ? 40 to + 125 c *1. when mounted on board [mounted board] (1) board size : 114.3 mm 76.2 mm t1.6 mm (2) name : jedec standard51-7 caution the absolute maximum ra tings are rated values exceeding whic h the product could suffer physical damage. these values must therefor e not be exceeded under any conditions. 0 50 100 150 400 200 0 power dissipation (p d ) [mw] ambient temperature (ta) [ c] 700 300 100 snt-6a sot-23-6 500 600 sot-23-5 figure 7 package power dissipation (when mounted on board)
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 10 ? electrical characteristics 1. 1.2 mhz product table 8 electrical characteristics (v dd = 3.3 v, ta = 25 c unless otherwise specified) item symbol conditions min. typ. max. unit test circuit input voltage *1 v dd ? 1.8 ? 5.5 v 2 operating start voltage *2 v st1 product without uvlo function, i out = 1 ma ? ? 1.1 v 3 oscillation start voltage v st2 no external parts for product without uvlo function, ? ? 1.0 v 1 operation holding voltage v hld product without uvlo function, i out = 1 ma, determined by decreasing v dd gradually 0.8 ? ? v 3 fb voltage v fb ? 0.588 0.6 0.612 v 1 fb voltage temperature coefficient ? v fb ? ta ta = ? 40 c to + 85 c ? 100 ? ppm/ c1 fb pin input current i fb v dd = 1.8 v to 5.5 v, fb pin 0.1 ? 0.1 a 1 current consumption at operation *3 i ss1 at switching operation, no load v fb = v fb(s) 0.95 ? 500 ? a 1 current consumption at switching off i ss2 at switching stop, v fb = v fb(s) 1.5 ? 70 120 a 1 current consumption at shutdown i sss off / on v = 0 v ? ? 1.0 a 1 i exth v ext = v dd ? 0.4 v ? ? 130 ? 60 ma 1 ext pin output current i extl v ext = 0.4 v 100 200 ? ma 1 oscillation frequency f osc ? 1.0 1.2 1.4 mhz 1 maximum duty ratio max duty v fb = v fb(s) 0.95 80 85 90 % 1 pwm / pfm switching duty ratio *4 pfm duty v dd = v out(s) ? 0.1 v, no load 20 28 36 % 2 short-circuit protection delay time *5 t pro product with short-circuit protection, at csp = 0.1 f 37.5 50 75 ms 1 uvlo release voltage v uvlo + product with uvlo function 1.60 1.70 1.78 v 1 uvlo hysteresis width v uvlohys product with uvlo function 0.05 0.10 0.15 v 1 high level input voltage v sh v dd = 1.8 v to 5.5 v, off on/ pin 0.75 ? ? v 1 low level input voltage v sl v dd = 1.8 v to 5.5 v, off on/ pin ? ? 0.3 v 1 product without off on/ pin pull-down, v dd = 1.8 v to 5.5 v, off on/ pin ? 0.1 ? 0.1 a 1 high level input current i sh product with off on/ pin pull-down, v dd = 1.8 v to 5.5 v, off on/ pin 0.2 1.0 2.5 a 1 low level input current i sl v dd = 1.8 v to 5.5 v, off on/ pin ? 0.1 ? 0.1 a 1 soft-start time t ss ? 5 7 10 ms 2 *1. the S-8365/8366 series steps up from v dd = 1.1 v, but set the i nput voltage as to 1.8 v v dd 5.5 v for stabilizing the output voltage and oscillation frequency. *2. this is the guaranteed value measured with external parts shown in ? table 10 external parts list ? and with test circuits shown in figure 10 . the operating start voltage varies larg ely depending on diode?s forward voltage. evaluate sufficiently with actual device. *3. v fb(s) is a setting value for fb voltage. *4. v out(s) is a setting value for output voltage. v out is the typical value of actual output voltage. v out(s) can be set by using the rate of v fb and the output voltage setting resistors (r fb1 , r fb2 ). *5. the short-circuit protection time can be set by the external capacitor, and the maximum set value by the external capacitor is unlimited when an ideal case is assumed. but use csp = approximately 0.47 f as a target maximum value due to the need to consider the discharge time of the capacitor.
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 11 2. 600 khz product table 9 electrical characteristics (v dd = 3.3 v, ta = 25 c unless otherwise specified) item symbol conditions min. typ. max. unit test circuit input voltage *1 v dd ? 1.8 ? 5.5 v 2 operating start voltage *2 v st1 product without uvlo function, i out = 1 ma ? ? 1.0 v 3 oscillation start voltage v st2 no external parts for product without uvlo function, ? ? 0.9 v 1 operation holding voltage v hld product without uvlo function, i out = 1 ma, determined by decreasing v dd gradually 0.8 ? ? v 3 fb voltage v fb ? 0.588 0.6 0.612 v 1 fb voltage temperature coefficient ? v fb ? ta ta = ? 40 c to + 85 c ? 100 ? ppm/ c1 fb pin input current i fb v dd = 1.8 v to 5.5 v, fb pin ? 0.1 ? 0.1 a 1 current consumption at operation *3 i ss1 at switching operation, no load v fb = v fb(s) 0.95 ? 300 ? a 1 current consumption at switching off i ss2 at switching stop, v fb = v fb(s) 1.5 ? 70 120 a 1 current consumption at shutdown i sss off / on v = 0 v ? ? 1.0 a 1 i exth v ext = v dd ? 0.4 v ? ? 130 ? 60 ma 1 ext pin output current i extl v ext = 0.4 v 100 200 ? ma 1 oscillation frequency f osc ? 510 600 690 khz 1 maximum duty ratio max duty v fb = v fb(s) 0.95 85 90 95 % 1 pwm / pfm switching duty ratio *4 pfm duty v dd = v out(s) ? 0.1 v, no load 20 28 36 % 2 short-circuit protection delay time *5 t pro product with short-circuit protection, at csp = 0.1 f 37.5 50 75 ms 1 uvlo release voltage v uvlo + product with uvlo function 1.60 1.70 1.78 v 1 uvlo hysteresis width v uvlohys product with uvlo function 0.05 0.10 0.15 v 1 high level input voltage v sh v dd = 1.8 v to 5.5 v, off on/ pin 0.75 ? ? v 1 low level input voltage v sl v dd = 1.8 v to 5.5 v, off on/ pin ? ? 0.3 v 1 product without off on/ pin pull-down, v dd = 1.8 v to 5.5 v, off on/ pin ? 0.1 ? 0.1 a 1 high level input current i sh product with off on/ pin pull-down, v dd = 1.8 v to 5.5 v, off on/ pin 0.2 1.0 2.5 a 1 low level input current i sl v dd = 1.8 v to 5.5 v, off on/ pin ? 0.1 ? 0.1 a 1 soft-start time t ss ? 5 7 10 ms 2 *1. the S-8365/8366 series steps up from v dd = 1.0 v, but set the i nput voltage as to 1.8 v v dd 5.5 v for stabilizing the output voltage and oscillation frequency. *2. this is the guaranteed value measured with external parts shown in ? table 10 external parts list ? and with test circuits shown in figure 10 . the operating start voltage varies larg ely depending on diode?s forward voltage. evaluate sufficiently with actual device. *3. v fb(s) is a setting value for fb voltage. *4. v out(s) is a setting value for output voltage. v out is the typical value of actual output voltage. v out(s) can be set by using the rate of v fb and the output voltage setting resistors (r fb1 , r fb2 ). *5. the short-circuit protection time can be set by the external capacitor, and the maximum set value by the external capacitor is unlimited when an ideal case is assumed. but use csp = approximately 0.47 f as a target maximum value due to the need to consider the discharge time of the capacitor.
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 12 ? external parts list when m easuring electrical characteristics table 10 external parts list element name symbol consonants manufacturer part number 2.2 h (1.2 mhz product) taiyo yuden co., ltd. nr6028t inductor l 3.3 h (600 khz product) tdk corporation ltf5022 m1 ? vishay intertechnology, inc. si3460bdv transistor q1 ? toshiba corporation 2sd2652 diode sd ? shindengen electric manufacturing co.,ltd d1fh3 input capacitor c in 10 f tdk corporation c3225x7r1e106mb output capacitor c out 22 f tdk corporation c4532x7r1e226mb fb pin capacitor c fb 47 pf murata manufacturing co., ltd. grm1882c1h series csp pin capacitor csp 0.1 f tdk corporation c1220x7r1e104mb speed-up capacitor c b 2200 pf tdk corporation c1005x7r1h222k base resistor r b 1 k ? rohm co., ltd. mcr03 series output voltage setting resistor 1 r fb1 220 k ? rohm co., ltd. mcr03 series output voltage setting resistor 2 r fb2 30 k ? rohm co., ltd. mcr03 series
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 13 ? test circuits 1. S-8365/8366 series a c in ext fb vss vdd a csp on/off v csp a figure 8 2. S-8365/8366 series c in ext fb vss vdd a csp on/off csp l r fb1 r fb2 c fb c out v sd v out i ou t m1 figure 9 3. S-8365/8366 series c in ext fb vss vdd a on/off l r fb1 r fb2 c fb c out v sd v out i ou t q1 c b r b figure 10
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 14 ? operation 1. switching control method 1.1 pwm control (S-8365 series) the S-8365 series is a switching regulator controller th at uses a pulse width modulation method (pwm). in conventional pwm control switching regulators, pul ses are skipped when the output load current is small, causing a fluctuation in the ripple fr equency of the output voltage, result ing in increased ripple voltage. for the S-8365 series, although the pulse width changes from 0% to 90% in accordance with each load current (or 0% to 85% for 1.2 mhz products), since the swit ching frequency does not change, the ripple voltage generated due to switching can be eliminated by filtering. the ripple voltage can thus be lowered in the wide input voltage and load current ranges. 1.2 pwm / pfm switching control (s-8366 series) the s-8366 series switching regulator controller automatically switches between the pulse width modulation method (pwm) and pulse frequency modulation method (pfm) according to the load current. a low ripple power can be supplied by operating on pwm control for which the pulse width changes from 28% to 90% (or 28% to 85% for 1.2 mhz products) in the range where the output load current is large. the s-8366 series operates on pfm control when the out put load current is small and the fixed pulses which have the width of 28% are skipped according to the lo ad current amount. therefore, the oscillation circuit intermittently oscillates, reducing the self-current c onsumption. this avoids decreased efficiency when the output load current is small. the point at which pwm control switches to pfm control varies depending on the external element (inductor, diode, etc.), input voltage va lue, and output voltage value, and this method achieves high efficiency in the output load current of about 100 a. 2. soft-start function the S-8365/8366 series has a soft-st art circuit. the output voltage (v out ) gradually rises after power-on or startup when the on/off pin is set to high, suppressing rush cu rrent and overshooting the out put voltage. the soft-start time (t ss ) for the S-8365/8366 series is defi ned as the time from startup until v out reaches 90% of the output set voltage value (v out(s) ). a reference voltage adjustment method is used as the soft-start method and the reference voltage gradually rises from 0 v after soft-start. a soft-start performs by controlling the fb pin voltage so that it follows the rise of the reference voltage. after the reference voltage rises once, it is reset to 0 if the on/of f pin voltage drops to low, the power supply voltage drops to the uvlo detection voltage, or the S-8365/8366 seri es enters the short-circuit protection latch status. a soft-start is performed regardless of cond itions when resuming step-up operation.
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 15 3. shutdown pin this pin stops or starts step-up operations. 3.1 without on/off pin pull-down when this pin is set to the low level, the voltage of the ex t pin is fixed to 0 v, and the external transistor and all internal circuits stop, substantially reducing the current consumption. do not use the on/off pin in a floating state because it is set up as shown in figure 11 and is not internally pulled up or down. do not apply a voltage of between 0.3 v and 0.75 v to the on/off pin because applying such a voltage increases the current consumption. if the on/off pin is not used, connect it to the vdd pin. table 11 off on/ pin cr oscillation circuit output voltage ?h? operates set value ?l? stops ? v in *1 *1. voltage obtained by subtracting the voltage drop d ue to the dc resistance of t he inductor and the diode forward voltage from v in . vdd on/off vss figure 11 3.2 with on/off pin pull-down when the on/off pin is set to the low level, the voltag e of the ext pin is fixed to 0 v, and the external transistor and all internal circuits stop subs tantially reducing the current consumption. the on/off pin is set up as shown in figure 12 and is internally pulled down by using the depression transistor, so all circuits stop even if this pin is float ing. do not apply a voltage of between 0.3 v and 0.75 v to the on/off pin because applying such a voltage increase s the current consumption. if the on/off pin is not used, connect it to the vdd pin. table 12 off on/ pin cr oscillation circuit output voltage ?h? operates set value ?l? stops ? v in *1 high-z stops ? v in *1 *1. voltage obtained by subtracting the voltage drop d ue to the dc resistance of t he inductor and the diode forward voltage from v in . vdd on/off vss figure 12
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 16 4. timer latch type short-circuit protection (p roducts with short-circuit protection function) the S-8365/8366 series incorporates a timer latch type shor t-circuit protection circuit that stops switching operation if the output short circuits for a certain time or more. conne ct a capacitor (csp) to the csp pin to set the delay time of this circuit. the S-8365/8366 series operates on the ma ximum duty if the output voltage drops due to output short-circuiting or other factors. when it enters the maxi mum duty status, charging the constant current to csp is started. if this status is held for the short-circuit protection delay time or more, the voltage of the csp pin exceeds the reference voltage and the ic enters the latch mode. note that switching operation stops in latch mode but the internal circuits normally operate, which differs from the power-off status. the constant current is continuously c harged to csp even in latch mode, so the voltage of the csp pin rises to the v dd level. to reset the latch mode of short-circuit protection, lower v dd to the uvlo detection voltage or lower or set the on/ off pin to the low level. short-circuit protection delay time input voltage (v dd ) output load csp pin voltage (v csp ) latch mode short-circuit state 50 ms (csp = 0.1 f) normal state short circuit protection delay time latch period reset period reset period short-circuit protection delay time uvlo release uvlo detection reference voltage figure 13 5. uvlo function (products with uvlo function) the S-8365/8366 series has a uvlo ( undervoltage lockout) circuit for avoiding ic malfunctions due to power supply voltage drops. the S-8365/8366 series stops sw itching operation upon uvlo detection and retains the external transistor in the off state. after entering the uvlo detection status once, the soft-start function is reset. note, however, that the other internal circuits operate normal ly and that the status differs from the power-off status.
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 17 ? operation principles the S-8365/8366 series is a step-up switching regulator controller. figure 14 shows the basic circuit diagram. step-up switching regulators start cu rrent supply by the input voltage (v in ) when the nch power mos fet is turned on and holds energy in the inductor at the same time . when the nch power mos fet is turned off, the cont pin voltage is stepped up to discharge the energy held in the inductor and the current is discharged to v out through the diode. when the discharged current is stored in c l , a voltage is generated , and the potential of v out increases until the voltage of the fb pin reaches the same pot ential as the internal reference voltage. for the pwm control method, the switching frequency (f osc ) is fixed and the v out voltage is held constant according to the ratio of the on ti me and off time (on duty) of the nch power mos fet in each period. for the pwm control method, the v out voltage is held constant by controlling the on time. in the s-8366 series, the nch power mos fet is turned on when the fixed duty cycle is 28% for the pfm control method. when energy is discharged to v out once and the v out potential exceeds the set value, the nch power mos fet stays in the off status until v out decreases to the set value or less due to the load discharge. time v out decreases to the set value or less depends on the amount of load current, so, the switching frequency varies depending on this current. vss fb ext c out r l v out cont i out i 2 v in l i 1 nch power mos fet sd figure 14 basic circuit of step-up switching regulator the on duty in the current continuous mode can be calcul ated by using the equation below. use the S-8365/8366 series in the range where the on duty is less than the ma ximum duty. note that the products with short-circuit protection is set in the timer-latch status if the maximum duty lasts the short-circuit protection delay time (t pro ) or more. the maximum duty is 85% typ. for 1.2 mhz products and 90% for 600 khz products. on duty = ? ? ? ? 1 ? v in v out + v d *1 100 [%] the on time (t on ) can be calculated by using the following equation : t on = f 1 osc on duty = f 1 osc ? ? ? ? 1 ? v in v out + v d *1 (1) *1. v d : forward voltage of diode
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 18 1. continuous current mode the following explains the current that flows into the in ductor when the step-up operation stabilizes in a certain status and i out is sufficiently large. when the nch power mos fet is turned on, current (i 1 ) flows in the direction shown in figure 14 . the inductor current (i l ) at this time gradually increases in proportion with the on time (t on ) of the nch power mos fet. current change of inductor within t on : ? i l(on) = i l max. ? i l min. = v in l t on when the nch power mos fet is turned off, the vo ltage of the cont pi n is stepped up to v out + v d and the voltage on both ends of the inductor becomes v out + v d ? v in . however, it is assumed here that v out >> v d and v d is ignored. current change of inductor within t off : ? i l(off) = v out ? v in l t off the input power equals the output power in an idea l situation where there is no loss by components. i in(av) : p in = p out i in(av) v in = i out v out i in(av) = v out v in i out .................. (2) the current that flows in the inductor consists of a ripple current that changes due to variation over time and a direct current. from figure 15 : i in(av) : i in(av) = i in(dc) + ? i l 2 = i in(dc) + v out ? v in 2 l t off = i in(dc) + v in 2 l t on .......... (3) above, the continuous mode is the operation mode when i in(dc) > 0 as shown in figure 15 and the inductor current continuously flows. while the output current (i out ) continues to decrease, i in(dc) reaches 0 as shown in figure 16 . this point is the critical point of the continuous mode. as shown in equations (2) and (3), the direct current component (i in(dc) ) depends on i out . i out(0) when i in(dc) reaches 0 (critical point) : i out(0) = t on v in 2 2 l v out t on can be calculated using equation (1). when the output current decreases below i out(0) , the current flowing in the inductor stops flowing in the t off period as shown in figure 17 . this is the discontinuous mode.
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 19 t i in(dc) t off t on t = 1 / f osc i l min. i l max. i in(av) i l figure 15 continuous mode (current cycle of inductor current i l ) t t off t on t = 1 / f osc i l min. i l max. i l figure 16 critical point (current cycle of inductor current i l ) t t off t on t = 1 / f osc i l min. i l max. i l figure 17 discontinuous mode (current cycle of inductor current i l )
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 20 ? external parts selection 1. inductor the recommended l value of the S-8365/8366 series is 2.2 h for 1.2 mhz products and 3.3 h for 600 khz products. note the following when changing the inductance. the inductance (l) has a strong influe nce on the maximum output current (i out ) and efficiency ( ). the inductor peak current (i pk ) increases when l is decreased, which improves the circuit stability and increases the i out users can obtain. if l is decreased fu rther, the ability of the external tr ansistor to drive the current becomes insufficient, reducing the efficiency and decreasing i out . the loss due to the i pk of the switching transistor is decreased by increasing l and the efficiency maximizes at a certain l value. if l is increased further, the loss due to the serial resistance of the inductor increases, lowering the efficiency. caution when selecting an inductor, be careful about its allowable current. if a current exceeding the allowable current flows through the inductor, magnetic saturation occurs, substantially lowering the efficiency and destroying ics due to large current. therefore, select an inductor such that i pk does not exceed the allowable current. the following equations express i pk in the ideal statuses in the discontinuous and continuous modes : i pk = 2 i out (v out + v d *2 ? v in ) f osc *1 l (discontinuous mode) i pk = v out + v d *2 v in i out + (v out + v d *2 ? v in ) v in 2 (v out + v d *2 ) f osc *1 l (continuous mode) *1. f osc : oscillation frequency *2. v d is the forward voltage of a dio de. the reference value is 0.4 v. however, current exceeding the above equation flows because conditions are practically not ideal. perform sufficient evaluation with actual application. table 13 typical inductors (for small low-profile devices) manufacture product name l value dc resistance rated current dimensions (l w h) [mm] vlf3010st-2r2m 2.2 h 0.092 ? max. 1.1 a max. 2.8 3.0 1.0 vlf3010st-3r3m 3.3 h 0.130 ? max. 0.88 a max. 2.8 3.0 1.0 vls252010-2r2m 2.2 h 0.190 ? max. 1.2 a max. 2.5 2.0 1.0 tdk corporation vls252010-3r3m 3.3 h 0.304 ? max. 1.0 a max. 2.5 2.0 1.0 lps3008-222ml 2.2 h 0.175 ? max. 1.1 a max. 3.0 3.0 0.8 coilcraft, inc. lps3008-332ml 3.3 h 0.285 ? max. 0.88 a max. 3.0 3.0 0.8 nr3010t2r2m 2.2 h 0.114 ? max. 1.1 a max. 3.0 3.0 1.0 taiyo yuden co., ltd. nr3010t3r3m 3.3 h 0.168 ? max. 0.87 a max. 3.0 3.0 1.0 cdrh2d11bnp-2r2n 2.2 h 0.0955 ? max. 1.4 a max. 3.0 3.0 1.2 sumida corporation cdrh2d11bnp-3r3n 3.3 h 0.154 ? max. 1.0 a max. 3.0 3.0 1.2 table 14 typical inductors (for large current, high step-up rate) manufacture product name l value dc resistance rated current dimensions (l w h) [mm] ltf5022t-2r2m 2.2 h 0.040 ? max. 3.4 a max. 5.0 5.2 2.2 tdk corporation ltf5022t-3r3m 3.3 h 0.060 ? max. 2.7 a max. 5.0 5.2 2.2 lps6225-222ml 2.2 h 0.045 ? max. 4.1 a max. 6.0 6.0 2.4 coilcraft, inc. lps6225-332ml 3.3 h 0.055 ? max. 3.6 a max. 6.0 6.0 2.4 taiyo yuden co., ltd. nr6028t2r2m 2.2 h 0.020 ? max. 4.2 a max. 6.0 6.0 2.8
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 21 2. diode use an externally mounted that meets the following conditions. ? low forward voltage (schottky barrier diode or similar type) ? high switching speed ? reverse withstand voltage of v out + spike voltage or more ? rated current of i pk or more 3. input capacitor (c in ) and output capacitor (c out ) to improve efficiency, an input capacitor (c in ) lowers the power supply impedance and averages the input current. select c in according to the impedance of the power supply used. the recommended capacitance is 10 f for the S-8365/8366 series. an output capacitor (c out ), which is used to smooth t he output voltage, requires a capac itance larger than that of the step-down type because the current is intermittently s upplied from the input to the output side in the step-up type. a 22 f ceramic capacitor is recommended for the S-8365/8366 series. however, a higher capacitance is recommended if the output voltage is hi gh or the load current is large. if t he output voltage or load current is low, about 10 f can be used without problems. select c out after sufficient evaluation with actual application. a ceramic capacitor can be used for both the input and output. 4. capacitor for setting short-circuit protection delay time (csp) (products with short-circuit protection) for the S-8365/8366 series, the short-circuit protection delay time can be set to any value by using an external capacitor. connect the capa citor between the csp and vss pins. select the capacitor valu e according to the equation below and figure 18 . note, however, that the equation and figure show a theoret ical value assuming an ideal capacitor value and typ. ic conditions. variations of the capac itor and ic are not considered. for the ic variations, see the short-circuit protection delay time (t pro ) in ? ? electrical characteristics ?. csp [ f] ? t pro [ms] 1.2 10 ? 3 0.6 csp [ f] t pro [ms] 0 0.05 0.10 0.15 0.20 0.25 0 20 40 60 80 100 120 figure 18 csp vs. t pro
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 22 5. external transistor a bipolar (npn) or enhanced (nch) mos fet transistor can be used as an external transistor. 5.1 bipolar npn type the driving ability to increase output current by using a bipolar transistor is determined based on the h fe value and r b value of the bipolar transistor. figure 19 shows the peripheral circuit. nch pch v dd i pk ext c b 2200 pf r b 1 k ? figure 19 external transistor peripheral circuit the recommended r b value is around 1 k ? . calculate the required base current (i b ) based on the h fe value of the bipolar transistor by using i b = i pk h fe , and then select an r b value smaller than that determined using: r b = v dd ? 0.7 i b 0.4 i exth smaller r b values increase the output current, but decrease the efficiency. actually, the current might flow on pulses or the v dd or v ss voltage might drop due to wiring resistance, so determine the optimum value based on experimentation. inserting a speed-up capacitor (c b ) in parallel with the r b resistor as shown in figure 19 reduces switching loss and increases efficiency. select a speed-up capacitor for which the c b value satisfies c b 1 2 r b f osc 0.7 . actually, however, the optimum c b value varies depending on the characteristics of the bipolar transistor used, so determine the optimum value based on experimentation. 5.2 enhanced mos fet type use an nch power mos fet. a mos fet that has low on-resistance (r on ) and input capacitance (c iss ) is ideal for gaining efficiency. the on-resistance and input capacitance generally have a tradeoff relationship. on-resistance is efficient in the range where the output cu rrent is high with relatively low frequency switching, and input capacitance is efficient in the range where the output current is medium to low with high frequency switching. therefore, select a mos fet for which the on-resistance and input capacitance are optimum under your usage conditions. the input voltage (v dd ) is supplied as the gate voltage of a mos fe t, so select a mos fet for which the gate withstand voltage is higher than the maximum value used for the input voltage, and for which the drain withstand voltage is greater than or equal to the output voltage (v out ) + the forward voltage of the diode (v d ). if a mos fet for which the threshold value is near the uvlo detection voltage is used, a high current flows upon power-on, and, in the worst case, the output vo ltage might not increase and the timer latch type short-circuit protection circuit might operate. therefore, se lect a mos fet for which the threshold value is sufficiently lower than the uvlo detection voltage.
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 23 6. output voltage setting resistors (r fb1 , r fb2 ), capacitor for phase compensation (c fb ) for the S-8365/8366 series, v out can be set to any value by using external divider resistors. connect the divider resistors between the vout and vss pins. because v fb = 0.6 v typ., v out can be calculated by using the following equation : v out = r fb1 + r fb2 r fb2 0.6 connect divider resistors r fb1 and r fb2 as close to the ic as possible to mini mize the effects of noise. if noise has an effect, adjust the values of r fb1 and r fb2 so that r fb1 + r fb2 < 100 k ? . c fb , which is connected in parallel with r fb1 , is a capacitor for phase compensation. by setting the zero point (the phase feedback) by adding capacitor c fb to output voltage setting resistor r fb1 in parallel, the phase margin increases, improving the stabi lity of the feedback loop. to effectively use the feedback portion of the phase based on the zero point, define c fb by using the following equation : c fb ? l c out 3 r fb1 v out v dd this equation is only a guide. the following explains the optimum setting. to efficiently use the feedback portion of the phase bas ed on the zero point, specify settings so that the phase feeds back at the zero point frequency (f zero ) of r fb1 and c fb according to the phase delay at the pole frequency (f pole ) of l and c out . the zero point frequency is generally set slightly higher than the pole frequency. the following equations are used to determine the pole frequency of l and c out and the zero point frequency set using r fb1 and c fb . f pole ? 1 2 l c out v dd v out f zero ? 1 2 r fb1 c fb the transient response can be improved by setting the zero point frequency in a lower frequency range. if, however, the zero point frequency is set in a significantly lower ran ge, the gain increases in the range of high frequency and the phase margin decreases. this might result in unstab le operation. determine the proper value after sufficient evaluation with actual application. the typical constants based on our evaluation are shown in table 15 . table 15 example of constant for external parts v out(s) [v] v dd [v] r fb1 [k ? ] r fb2 [k ? ] c fb [pf] l [ h] c out [ f] 1.8 1.2 30 15 100 3.3 10 1.8 1.2 30 15 82 2.2 10 3.32 1.2 68 15 82 3.3 10 3.32 1.2 68 15 68 2.2 10 5.0 1.8 110 15 68 3.3 22 5.0 1.8 110 15 56 2.2 22 9.0 3.3 210 15 39 3.3 22 9.0 3.3 210 15 33 2.2 22 15.0 3.3 360 15 39 3.3 22 15.0 3.3 360 15 33 2.2 22
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 24 ? standard circuit (1) with short-circuit protection (snt-6a, sot-23-6) fb triangular wave oscillation circuit pwm comparato r uvlo circuit vss r fb1 r fb2 v out v in c in ? + ? + csp reference voltage with soft-start circuit l c out m1 sd c fb 0.1 f ground point pwm control, o r pwm / pfm switching control circuit timer latch short-circuit protection circuit on/off vdd ext on/off circuit error amplifier figure 20 (2) without short-circuit protection (sot-23-5) v in fb pwm comparator uvlo circuit vss r fb1 r fb2 v out ? + ? + reference voltage with soft-start circuit m1 sd c fb ground point pwm control, o r pwm / pfm switching control circuit 0.1 f on/off vdd ext on/off circuit c out l c in error amplifier triangular wave oscillation circuit figure 21
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 25 (3) low input voltage (sot-23-5) q1 c b r b fb vss r fb1 r fb2 v out v in c in ? + ? + l c out sd c fb ic internal power supply ground point 0.1 f vdd on/off ext on/off circuit pwm control, o r pwm / pfm switching control circuit pwm comparator triangular wave oscillation circuit error amplifier reference voltage with soft-start circuit figure 22 caution the above connection diagram and constant will not guarantee successful operation. perform thorough evaluation using an actual application to set the constants. ? precaution ? mount external capacitors and inductor as close as possible to the ic. set single point ground. ? characteristics ripple voltage and spike noise occur in ic containing switching regulators. moreover rush current flows at the time of a power supply injection. because these largely depend on the inductor, the capacitor and impedance of power supply used, fully check them using an actually mounted model. ? the 0.1 f capacitor connected between the vdd and vss pins is a bypass capacitor. it stabilizes the power supply in the ic when application is used with a heav y load, and thus effectively works for stable switching regulator operation. allocate the bypass capacitor as clos e to the ic as possible, prioritized over other parts. ? although the ic contains a static elec tricity protection circuit, static electricit y or voltage that exceeds the limit of the protection circuit should not be applied. ? the power dissipation of the ic greatly varies dependin g on the size and material of the board to be connected. perform sufficient evaluation using an actual application before designing. ? sii claims no responsibility for any disputes arising out of or in connection with any infringement by products including this ic of patents owned by a third party.
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 26 ? application circuits application circuits are examples. they may always not guarantee successful operation. 1. external parts for application circuits table 16 characteristics of external parts part part name manfuacturer characteristics nr6028t-2r2m taiyo yuden co., ltd. 2.2 h, dcr *1 = 0.020 ? , i max *2 = 4.2 a, l w h = 6.0 6.0 2.8 mm ltf5022t-3r3m 3.3 h, dcr *1 = 0.060 ? , i max *2 = 2.7 a, l w h = 5.0 5.2 2.2 mm vlf3010st-2r2m 2.2 h, dcr *1 = 0.114 ? , i max *2 = 1.1 a, l w h = 3.0 3.0 1.0 mm inductor vlf3010st-3r3m tdk corporation 3.3 h, dcr *1 = 0.168 ? , i max *2 = 0.87 a, l w h = 3.0 3.0 1.0 mm rb070m-30tr v f *3 = 0.44 v, i f *4 = 1.5 a, v r *5 = 30 v l w h = 3.5 1.6 0.9 mm diode rb050la-30 rohm co., ltd. v f *3 = 0.45 v, i f *4 = 3.0 a, v r *5 = 30 v l w h = 4.7 2.6 1.05 mm si2312bds vishay intertechnology, inc. v dss *6 = 20 v, v gss *7 = 8 v, i d *8 = 5.0 a, q g *9 = 12 nc max. r ds(on) *10 = 0.047 ? max. (v gs *11 = 2.5 v) l w h = 2.9 2.64 1.12 mm transistor 2sd2652 rohm co., ltd. v ceo *12 = 12 v, v ebo *13 = 6 v, i c *14 = 1.5 a, h fe *15 = 270 min./680 max. (v ce /i c = 2 v/200 ma) l w h = 2.0 1.25 0.9 mm jmk107bj106ma-t 10 f, e dc *16 = 6.3 v, x5r, l w h = 1.6 0.8 0.95 mm lmk212bj106kd-t 10 f, e dc *16 = 10 v, x5r, l w h = 2.0 1.25 0.95 mm emk316bj106kf-t 10 f, e dc *16 = 16 v, x5r, l w h = 3.2 1.6 1.25 mm tmk325b7106mn-t taiyo yuden co., ltd. 10 f, e dc *16 = 25 v, x7r, l w h = 3.2 2.5 2.1 mm c2012x5r1a106kt 10 f, e dc *16 = 10 v, x5r, l w h = 2.0 1.25 1.45 mm c1005x7r1c104kt tdk corporation 0.1 f, e dc *16 = 16 v, x7r, l w h = 1.0 0.5 0.55 mm capacitor grm31cr71a106ka murata manufacturing, co., ltd. 10 f, e dc *16 = 10 v, x7r, l w h = 3.2 1.6 1.6 mm * 1. dcr : dc resistance * 2. i max : maximum allowable current * 3. v f : forward voltage * 4. i f : forward current * 5. v r : reverse voltage * 6. v dss : drain-source voltage (during short-circuiting between the gate and source) * 7. v gss : gate-source voltage (during short-circuiting between the drain and source) * 8. i d : drain current * 9. q g : gate charge *10. r ds(on ) : on-resistance between the drain and source *11. v gs : gate-source voltage *12. v ceo : collector-emitter voltage *13. v ebo : emitter-base voltage *14. i c : collector current *15. h fe : direct current gain *16. e dc : rated voltage
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 27 2. power supply for lcd following shows a circuit example and its characterist ics for driving an lcd panel (with 9 v and 15 v outputs). l S-8365/8366 series vdd vss on/off fb ext c dd c out r fb1 r fb2 c fb v out csp csp m1 c in sd figure 23 circuit example (power supply for lcd) table 17 external part examples (power supply for lcd) (1 / 2) condition output voltage ic product name l product name m1 product name sd product name 1 9 v S-8365aabba nr6028t2r2m si2312bds rb050la-30 2 9 v s-8366aabba nr6028t2r2m si2312bds rb050la-30 3 15 v S-8365aabba nr6028t2r2m si2312bds rb050la-30 4 15 v s-8366aabba nr6028t2r2m si2312bds rb050la-30 table 17 external part examples (power supply for lcd) (2 / 2) condition c in product name c out product name r fb1 r fb2 c fb c dd 1 lmk212bj106kg-t emk316bj106kf-t 2 280 k ? 20 k ? 22 pf 0.1 f 2 lmk212bj106kg-t emk316bj106kf-t 1 280 k ? 20 k ? 27 pf 0.1 f 3 lmk212bj106kg-t tmk325b7106mn-t 2 360 k ? 15 k ? 27 pf 0.1 f 4 lmk212bj106kg-t tmk325b7106mn-t 1 360 k ? 15 k ? 33 pf 0.1 f caution the above connection will not guarantee successful operation. perform thorough evaluation using an actual application to set the constant.
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 28 3. output characteristics of power supply for lcd following shows the output current (i out ) vs. efficiency ( ) and output current (i out ) vs. output voltage (v out ) characteristics for conditions 1 to 4 in table 17 . condition 1         
         

   
                 
           
 condition 2 0.1 1000 1 10 100 [%] 100 0 50 70 80 30 10 20 40 60 90 v in = 2.0 v v in = 3.3 v v in = 3.6 v i out [ma] 0.1 1000 1 10 100 9.2 7.8 9.0 8.8 8.6 8.4 8.2 8.0 v in = 2.0 v v in = 3.3 v v in = 3.6 v v out [v] i out [ma] condition 3         
    

   
          0.1 1000 1 10 100 15.5 13.0 15.0 14.5 14.0 13.5 v in = 3.3 v v in = 3.6 v v in = 5.5 v i out [ma] v out [v] condition 4 0.1 1000 1 10 100 [%] 100 0 50 70 80 30 10 20 40 60 90 v in = 5.5 v v in = 3.6 v v in = 3.3 v i out [ma] 0.1 1000 1 10 100 15.5 13.0 15.0 14.5 14.0 13.5 v in = 3.3 v v in = 3.6 v v in = 5.5 v v out [v] i out [ma]
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 29 4. power supply for high output current following shows a circuit example and its characteristics for outputting 3.3 v from two dry cells (1.8 v) and satisfying i out = 800 ma. l S-8365/8366 series vdd vss on/off fb ext c out r fb1 r fb2 c fb v out csp csp m1 c dd c in sd figure 24 circuit example (power supply for high output current) table 18 external part examples (power supply for high output current) (1 / 2) condition output voltage ic product name l product name m1 product name sd product name 1 3.32 v S-8365aabba nr6028t2r2m si2312bds rb050la-30 2 3.32 v S-8365abbba ltf5022-3r3m si2312bds rb050la-30 3 3.32 v s-8366aabba nr6028t2r2m si2312bds rb050la-30 4 3.32 v s-8366abbba ltf5022-3r3m si2312bds rb050la-30 table 18 external part examples (power supply for high output current) (2 / 2) condition c in product name c out product name r fb1 r fb2 c fb c dd 1 c2012x5r1a106kt grm31cr71a106ka 2 68 k ? 15 k ? 68 pf 0.1 f 2 c2012x5r1a106kt grm31cr71a106ka 2 68 k ? 15 k ? 82 pf 0.1 f 3 c2012x5r1a106kt grm31cr71a106ka 2 68 k ? 15 k ? 68 pf 0.1 f 4 c2012x5r1a106kt grm31cr71a106ka 2 68 k ? 15 k ? 82 pf 0.1 f caution the above connection will not guarantee successful operation. perform thorough evaluation using an actual application to set the constant.
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 30 5. output characteristics of power supply for high output current following shows the output current (i out ) vs. efficiency ( ) and output current (i out ) vs. output voltage (v out ) characteristics for conditions 1 to 4 in table 18 . condition 1      
                   0.1 10000 3.5 2.5 3.0 3.2 3.3 2.8 2.6 2.7 2.9 3.1 3.4 1 10 100 1000 v in = 1.8 v v in = 2.7 v v out [v] i out [ma] condition 2 0.1 10000 [%] 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 v in = 1.8 v v in = 2.7 v i out [ma]             
             condition 3 0.1 10000 [%] 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 v in = 1.8 v v in = 2.7 v i out [ma] 0.1 10000 3.5 2.5 3.0 3.2 3.3 2.8 2.6 2.7 2.9 3.1 3.4 1 10 100 1000 v in = 1.8 v v in = 2.7 v v out [v] i out [ma] condition 4 0.1 10000 [%] 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 v in = 1.8 v v in = 2.7 v i out [ma]             
            
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 31 6. circuit for low power supply voltage applications following shows a circuit example that starts up by using a dry cell (1.2 v) and its characteristics. l S-8365/8366 series vdd vss on/off fb ext c out r fb1 r fb2 c fb v out q1 cb rb c dd c in sd figure 25 circuit example (circuit for low power supply voltage applications) table 19 external part examples (circuit for low power supply voltage applications) (1 / 2) condition output voltage ic product name l product name q1 product name sd product name 1 3.32 v s-8366aaaaa vlf3010st-2r2m 2sd2652 rb070m-30tr 2 3.32 v s-8366abaaa vlf3010st-3r3m 2sd2652 rb070m-30tr table 19 external part examples (circuit for low power supply voltage applications) (2 / 2) condition c in product name c out product name r fb1 r fb2 c fb c dd 1 jmk107bj106ma-t lmk212bj106kd-t 1 68 k ? 15 k ? 68 pf 0.1 f 2 jmk107bj106ma-t lmk212bj106kd-t 1 68 k ? 15 k ? 82 pf 0.1 f caution the above connection will not guarantee successful operation. perform thorough evaluation using an actual application to set the constant.
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 32 7. output characteristics of circuits for low power supply voltage applications following shows the output current (i out ) vs. efficiency ( ) and output current (i out ) vs. output voltage (v out ) characteristics for conditions 1 and 2 in table 19 . condition 1        
                                   
           condition 2 0.1 1000 1 10 100 [%] 90 0 80 70 60 50 40 30 20 10 v in = 0.9 v v in = 1.2 v v in = 1.5 v i out [ma] 0.1 1000 1 10 100 3.5 2.5 3.0 3.2 3.3 2.8 2.6 2.7 2.9 3.1 3.4 v in = 0.9 v v in = 1.2 v v in = 1.5 v v out [v] i out [ma]
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 33 ? characteristics (typical data) 1. examples of major power supply dependence characteristics (ta = 25 c) (1) current consumption during operation (i ss1 ) vs. input voltage (v in ) (2) current consumption during shutdown (i sss ) vs. input voltage (v in ) i ss1 [ a] 700 0 600 500 400 300 200 100 1.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 1.2 mhz 600 khz v in [v] i sss [ a] 1.0 0.0 0.8 0.6 0.4 0.2 v in [v] 1.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 (3) oscillation frequency (f osc ) vs. input voltage (v in ) f osc = 1.2 mhz f osc = 600 khz 1.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 f osc [mhz] 1.4 1.0 1.3 1.2 1.1 v in [v] 1.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 500 650 600 550 700 f osc [khz] v in [v] (4) maximum duty ratio (maxduty) vs. input voltage (v in ) (5) soft-start time (t ss ) vs. input voltage (v in ) 1.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 maxduty [%] 100 70 95 90 85 80 75 1.2 mhz 600 khz v in [v] 1.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 t ss [ms] 10 0 9 8 7 6 5 4 3 2 1 v in [v] (6) pwm / pfm switching duty ratio (pfmduty) vs. input voltage (v in ) 1.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 pfmduty [%] 40 0 35 30 25 20 15 10 5 v in [v]
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 34 (7) high level input voltage (v sh ) vs. input voltage (v in ) (8) low level input voltage (v sl ) vs. input voltage (v in ) 1.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 v sh [v] 0.3 0.8 0.7 0.6 0.5 0.4 v in [v] 1.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 v sl [v] 0.3 0.8 0.7 0.6 0.5 0.4 v in [v] (9) fb voltage (v fb ) vs. input voltage (v in ) (10) short-circuit protection delay time (t pro ) vs. input voltage (v in ) csp = 0.1 f 1.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 v fb [v] 0.3 0.8 0.7 0.6 0.5 0.4 v in [v] 1.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 t pro [ms] 0 80 70 60 50 40 30 20 10 v in [v] (11) ext pin output current ?h? (i exth ) vs. input voltage (v in ) (12) ext pin output current ?l? (i extl ) vs. input voltage (v in ) 1.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 i exth [ma] 0 ? 300 ? 250 ? 200 ? 150 ? 100 ? 50 v in [v] 1.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0 300 250 200 150 100 50 i exth [ma] v in [v]
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 35 2. examples of major temperature characteristics (ta = ? 40 to 85 c) (1) current consumption during operation (i ss1 ) vs. temperature (ta) f osc = 1.2 mhz f osc = 600 khz 0 ? 40 85 75 50 25 0 ? 25 700 100 200 300 400 500 600 ta [ c] i ss1 [ a] v dd = 5.5 v v dd = 3.6 v v dd = 2.0 v ? 40 85 75 50 25 0 ? 25 0 700 100 200 300 400 500 600 ta [ c] i ss1 [ a] v dd = 5.5 v v dd = 3.6 v v dd = 2.0 v (2) current consumption during shutdown (i sss ) vs. temperature (ta) ? 40 85 75 50 25 0 ? 25 0.0 1.0 ta [ c] 0.5 0.7 0.8 0.3 0.1 0.2 0.4 0.6 0.9 i sss [ a] v dd = 5.5 v v dd = 3.6 v v dd = 2.0 v (3) oscillation frequency (f osc ) vs. temperature (ta) f osc = 1.2 mhz f osc = 600 khz ? 40 85 75 50 25 0 ? 25 ta [ c] 1.4 1.0 1.3 1.2 1.1 v dd = 5.5 v v dd = 3.6 v v dd = 2.0 v f osc [mhz] ? 40 85 75 50 25 0 ? 25 ta [ c] 700 500 650 600 550 v dd = 5.5 v v dd = 3.6 v v dd = 2.0 v f osc [khz] (4) maximum duty ratio (maxduty) vs. temperature (ta) f osc = 1.2 mhz f osc = 600 khz ? 40 85 75 50 25 0 ? 25 ta [ c] maxduty [%] 100 70 95 90 85 80 75 v dd = 5.5 v v dd = 3.6 v v dd = 2.0 v ? 40 85 75 50 25 0 ? 25 ta [ c] maxduty [%] 100 70 95 90 85 80 75 v dd = 5.5 v v dd = 3.6 v v dd = 2.0 v
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 36 (5) soft-start time (t ss ) vs. temperature (ta) (6) pwm / pfm switching duty ratio (pfmduty) vs. temperature (ta) ? 40 85 75 50 25 0 ? 25 ta [ c] 3 10 4 5 6 7 8 9 t ss [ms] v dd = 5.5 v v dd = 3.6 v v dd = 2.0 v ? 40 85 75 50 25 0 ? 25 ta [ c] 20 36 34 32 30 28 26 24 22 pfmduty [%] v dd = 5.5 v v dd = 3.6 v v dd = 2.0 v (7) high level input voltage (v sh ) vs. temperature (ta) (8) low level input voltage (v sl ) vs. temperature (ta) ? 40 85 75 50 25 0 ? 25 ta [ c] 0.3 0.8 0.7 0.6 0.5 0.4 v sh [v] v dd = 5.5 v v dd = 3.6 v v dd = 2.0 v ? 40 85 75 50 25 0 ? 25 ta [ c] 0.3 0.8 0.7 0.6 0.5 0.4 v sl [v] v dd = 5.5 v v dd = 3.6 v v dd = 2.0 v (9) uvlo release voltage (v uvlo+ ) vs. temperature (ta) (10) uvlo hysteresis width (v uvlohys ) vs. temperature (ta) ? 40 85 75 50 25 0 ? 25 ta [ c] 1.40 1.80 1.75 1.70 1.65 1.60 1.55 1.50 1.45 v uvlo+ [v] ? 40 85 75 50 25 0 ? 25 ta [ c] v uvlohys [v] 0.20 0.00 0.10 0.14 0.16 0.06 0.02 0.04 0.08 0.12 0.18 (11) fb voltage (v fb ) vs. temperature (ta) (12) shor t-circuit protection delay time (t pro ) vs. temperature (ta) csp = 0.1 f ? 40 85 75 50 25 0 ? 25 ta [ c] v fb [v] 0.62 0.58 0.61 0.60 0.59 v dd = 5.5 v v dd = 3.6 v v dd = 2.0 v ? 40 85 75 50 25 0 ? 25 ta [ c] 30 80 70 60 50 40 t pro [ms] v dd = 5.5 v v dd = 3.6 v v dd = 2.0 v
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 37 (13) ext pin output current ?h? (i exth ) vs. temperature (ta) (14) ext pin output current ?l? (i extl ) vs. temperature (ta) ? 40 85 75 50 25 0 ? 25 ta [ c] 0 ? 350 ? 50 ? 100 ? 150 ? 200 ? 250 ? 300 v dd = 5.5 v v dd = 3.6 v v dd = 2.0 v i exth [ma] ? 40 85 75 50 25 0 ? 25 ta [ c] 0 350 50 100 150 200 250 300 i extl [ma] v dd = 5.5 v v dd = 3.6 v v dd = 2.0 v (15) operating start voltage (v st1 ) vs. temperature (ta) f osc = 1.2 mhz f osc = 600 khz ? 40 85 75 50 25 0 ? 25 ta [ c] 0.0 1.0 0.8 0.6 0.4 0.2 S-8365 series s-8366 series v st1 [v] ? 40 85 75 50 25 0 ? 25 ta [ c] 0.0 1.0 0.8 0.6 0.4 0.2 S-8365 series s-8366 series v st1 [v] (16) oscillation start voltage (v st2 ) vs. temperature (ta) f osc = 1.2 mhz f osc = 600 khz ? 40 85 75 50 25 0 ? 25 ta [ c] 0.0 1.4 0.2 0.4 0.6 0.8 1.0 1.2 S-8365 series s-8366 series v st2 [v] ? 40 85 75 50 25 0 ? 25 ta [ c] v st2 [v] 0.0 1.4 0.2 0.4 0.6 0.8 1.0 1.2 S-8365 series s-8366 series (17) operation holding voltage (v hld ) vs. temperature (ta) f osc = 1.2 mhz f osc = 600 khz ? 40 85 75 50 25 0 ? 25 ta [ c] 0.0 1.4 0.2 0.4 0.6 0.8 1.0 1.2 S-8365 series s-8366 series v hld [v] ? 40 85 75 50 25 0 ? 25 ta [ c] v hld [v] 0.0 1.4 0.2 0.4 0.6 0.8 1.0 1.2 S-8365 series s-8366 series
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 38 3. examples of transient response characteristics unless otherwise specified, the used parts are those in table 10 external parts list . 3.1 at power-on (v out(s) = 5.0 v, v in = 0 v 3.3 v, pwm control, ta = 25 c) (1) f osc = 1.2 mhz, i out = 1 ma S-8365aabba (2) f osc = 1.2 mhz, i out = 600 ma S-8365aabba         
                
  
 0 0.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 6.0 5.0 4.0 3.0 2.0 1.0 5101520 t [ms] v out v in i l i l [a] v in , v out [v] (3) f osc = 600 khz, i out = 1 ma S-8365abbba (4) f osc = 600 khz, i out = 600 ma S-8365abbba         
                
  
 0 0.0 6.0 5.0 4.0 3.0 2.0 1.0 5101520 t [ms] 0.0 6.0 5.0 4.0 3.0 2.0 1.0 v out v in i l i l [a] v in , v out [v] 3.2 at power-on (v out(s) = 5.0 v, v in = 0 v 3.3 v, pwm / pfm switching control, ta = 25 c)) (1) f osc = 1.2 mhz, i out = 1 ma s-8366aabba (2) f osc = 1.2 mhz, i out = 600 ma s-8366aabba         
                
  
 0 0.0 6.0 5.0 4.0 3.0 2.0 1.0 5101520 t [ms] 0.0 6.0 5.0 4.0 3.0 2.0 1.0 v out v in i l i l [a] v in , v out [v] (3) f osc = 600 khz, i out = 1 ma s-8366abbba (4) f osc = 600 khz, i out = 600 ma s-8366abbba 0 0.0 6.0 5.0 4.0 3.0 2.0 1.0 5101520 t [ms] 0.0 6.0 5.0 4.0 3.0 2.0 1.0 v out v in i l v in , v out [v] i l [a] 0 0.0 6.0 5.0 4.0 3.0 2.0 1.0 5101520 t [ms] v out v in i l 0.0 6.0 5.0 4.0 3.0 2.0 1.0 i l [a] v in , v out [v]
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 39 3.3 shutdown pin response (v out = 5.0 v, v in = 3.3 v, v on/off = 0 v 3.3 v, pwm control, ta = 25 c) (1) f osc = 1.2 mhz, i out = 1 ma S-8365aabba (2) f osc = 1.2 mhz, i out = 600 ma S-8365aabba 0 0.0 6.0 5.0 4.0 3.0 2.0 1.0 5101520 t [ms] 0.0 6.0 5.0 4.0 3.0 2.0 1.0 i l v out v on/off i l [a] v on/off , v out [v] 0 0.0 6.0 5.0 4.0 3.0 2.0 1.0 5101520 t [ms] 0.0 6.0 5.0 4.0 3.0 2.0 1.0 i l v out v on/off i l [a] v on/off , v out [v] (3) f osc = 600 khz, i out = 1 ma S-8365abbba (4) f osc = 600 khz, i out = 600 ma S-8365abbba 0 0.0 6.0 5.0 4.0 3.0 2.0 1.0 5101520 t [ms] 0.0 6.0 5.0 4.0 3.0 2.0 1.0 i l v out v on/off i l [a] v on/off , v out [v]         
              
    
 3.4 shutdown pin response (v out = 5.0 v, v in = 3.3 v, v on/off = 0 v 3.3 v, pwm / pfm switching control, ta = 25 c) (1) f osc = 1.2 mhz, i out = 1 ma s-8366aabba (2) f osc = 1.2 mhz, i out = 600 ma s-8366aabba 0 0.0 6.0 5.0 4.0 3.0 2.0 1.0 5101520 t [ms] 0.0 6.0 5.0 4.0 3.0 2.0 1.0 i l v out v on/off i l [a] v on/off , v out [v] 0 0.0 6.0 5.0 4.0 3.0 2.0 1.0 5101520 t [ms] 0.0 6.0 5.0 4.0 3.0 2.0 1.0 i l v out v on/off i l [a] v on/off , v out [v] (3) f osc = 600 khz, i out = 1 ma s-8366abbba (4) f osc = 600 khz, i out = 600 ma s-8366abbba 0 0.0 6.0 5.0 4.0 3.0 2.0 1.0 5101520 t [ms] 0.0 6.0 5.0 4.0 3.0 2.0 1.0 i l [a] v on/off , v out [v] v out v on/off i l 0 0.0 6.0 5.0 4.0 3.0 2.0 1.0 5101520 t [ms] 0.0 6.0 5.0 4.0 3.0 2.0 1.0 v out v on/off i l i l [a] v on/off , v out [v]
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 40 3.5 power supply voltage fluctuations (v out = 5.0 v, i out = 1 ma, pwm control, ta = 25 c) (1) f osc = 1.2 mhz, v in = 2.8 v 3.8 v S-8365aabba (2) f osc = 1.2 mhz, v in = 3.8 v 2.8 v S-8365aabba 0 4.75 5.05 5.00 4.95 4.90 4.85 4.80 10 2468 t [ms] 0 12 10 8 6 4 2 v in [v] v out [v] v out v in                
                 (3) f osc = 600 khz, v in = 2.8 v 3.8 v S-8365abbba (4) f osc = 600 khz, v in = 3.8 v 2.8 v S-8365abbba                                                            3.6 power supply voltage fluctuations (v out = 5.0 v, i out = 1 ma, pwm / pfm switching control, ta = 25 c) (1) f osc = 1.2 mhz, v in = 2.8 v 3.8 v s-8366aabba (2) f osc = 1.2 mhz, v in = 3.8 v 2.8 v s-8366aabba 0 4.85 5.15 5.10 5.05 5.00 4.95 4.90 10 2468 t [ms] 0 12 10 8 6 4 2 v in [v] v out [v] v out v in 4.85 5.15 5.10 5.05 5.00 4.95 4.90 2.0 0.0 t [ms] 0 12 10 8 6 4 2 v in [v] v out [v] 1.6 1.2 0.8 0.4 v out v in (3) f osc = 600 khz, v in = 2.8 v 3.8 v s-8366abbba (4) f osc = 600 khz, v in = 3.8 v 2.8 v s-8366abbba 0 4.85 5.15 5.10 5.05 5.00 4.95 4.90 10 2468 t [ms] 0 12 10 8 6 4 2 v in [v] v out [v] v out v in          
       
  
        
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 41 3.7 power supply voltage fluctuations (v out = 5.0 v, i out = 500 ma, pwm control, ta = 25 c) (1) f osc = 1.2 mhz, v in = 2.8 v 3.8 v S-8365aabba (2) f osc = 1.2 mhz, v in = 3.8 v 2.8 v S-8365aabba 4.00 5.60 5.40 5.20 5.00 4.80 4.60 4.40 4.20 1.0 0.0 t [ms] 0 16 v in [v] v out [v] 0.8 0.6 0.4 0.2 2 4 6 8 10 12 14 v out v in            
   
  
               (3) f osc = 600 khz, v in = 2.8 v 3.8 v S-8365abbba (4) f osc = 600 khz, v in = 3.8 v 2.8 v S-8365abbba            
   
  
               4.00 5.60 5.40 5.20 5.00 4.80 4.60 4.40 4.20 1.0 0.0 t [ms] 0 16 v in [v] v out [v] 0.8 0.6 0.4 0.2 2 4 6 8 10 12 14 v out v in 3.8 power supply voltage fluctuations (v out = 5.0 v, i out = 500 ma, pwm / pfm switching control, ta = 25 c) (1) f osc = 1.2 mhz, v in = 2.8 v 3.8 v s-8366aabba (2) f osc = 1.2 mhz, v in = 3.8 v 2.8 v s-8366aabba 4.00 5.60 5.40 5.20 5.00 4.80 4.60 4.40 4.20 1.0 0.0 t [ms] 0 16 v in [v] v out [v] 0.8 0.6 0.4 0.2 2 4 6 8 10 12 14 v out v in 4.00 5.60 5.40 5.20 5.00 4.80 4.60 4.40 4.20 1.0 0.0 t [ms] 0 16 v in [v] v out [v] 0.8 0.6 0.4 0.2 2 4 6 8 10 12 14 v out v in (3) f osc = 600 khz, v in = 2.8 v 3.8 v s-8366abbba (4) f osc = 600 khz, v in = 3.8 v 2.8 v s-8366abbba 4.00 5.60 5.40 5.20 5.00 4.80 4.60 4.40 4.20 1.0 0.0 t [ms] 0 16 v in [v] v out [v] 0.8 0.6 0.4 0.2 2 4 6 8 10 12 14 v out v in 4.00 5.60 5.40 5.20 5.00 4.80 4.60 4.40 4.20 1.0 0.0 t [ms] 0 16 v in [v] v out [v] 0.8 0.6 0.4 0.2 2 4 6 8 10 12 14
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 42 3.9 load fluctuations (v out = 5.0 v, v in = 3.3 v, i out = 0.1 ma 100 ma 0.1 ma, pwm control, ta = 25 c) (1) f osc = 1.2 mhz, i out = 0.1 ma 100 ma S-8365aabba (2) f osc = 1.2 mhz, i out = 100 ma 0.1 ma S-8365aabba 4.60 5.40 5.30 5.20 5.10 5.00 4.90 4.80 4.70 4.0 0.0 t [ms] 0 1600 i out [ma] v out [v] 3.0 2.5 3.5 2.0 1.5 1.0 0.5 200 400 600 800 1000 1200 1400 v out i out          
                              (3) f osc = 600 khz, i out = 0.1 ma 100 ma S-8365abbba (4) f osc = 600 khz, i out = 100 ma 0.1 ma S-8365abbba 4.60 5.40 5.30 5.20 5.10 5.00 4.90 4.80 4.70 4.0 0.0 t [ms] 0 1600 i out [ma] v out [v] 3.0 3.5 2.0 2.5 1.5 1.0 0.5 200 400 600 800 1000 1200 1400 v out i out          
                              3.10 load fluctuations (v out = 5.0 v, v in = 3.3 v, i out = 0.1 ma 100 ma 0.1 ma, pwm / pfm switching control, ta = 25 c) (1) f osc = 1.2 mhz, i out = 0.1 ma 100 ma s-8366aabba (2) f osc = 1.2 mhz, i out = 100 ma 0.1 ma s-8366aabba          
                                       
                              (3) f osc = 600 khz, i out = 0.1 ma 100 ma s-8366abbba (4) f osc = 600 khz, i out = 100 ma 0.1 ma s-8366abbba 4.60 5.40 5.30 5.20 5.10 5.00 4.90 4.80 4.70 4.0 0.0 t [ms] 0 1600 i out [ma] v out [v] 3.0 2.5 3.5 2.0 1.0 1.5 0.5 200 400 600 800 1000 1200 1400 v out i out 4.60 5.40 5.30 5.20 5.10 5.00 4.90 4.80 4.70 t [ms] 0 1600 i out [ma] v out [v] 200 400 600 800 1000 1200 1400 40 35 30 25 20 15 10 5 0 v out i out
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 43 3.11 load fluctuations (v out = 5.0 v, v in = 3.3 v, i out = 0.1 ma 300 ma 0.1 ma, pwm control, ta = 25 c) (1) f osc = 1.2 mhz, i out = 0.1 ma 300 ma S-8365aabba (2) f osc = 1.2 mhz, i out = 300 ma 0.1 ma S-8365aabba 4.00 5.60 5.40 5.20 5.00 4.80 4.60 4.40 4.20 1.0 0.0 t [ms] 0 1600 i out [ma] v out [v] 0.8 0.6 0.4 0.2 200 400 600 800 1000 1200 1400 v out i out t [ms] 0 1600 i out [ma] v out [v] 200 400 600 800 1000 1200 1400 40 35 30 25 20 15 10 5 0 4.00 5.60 5.40 5.20 5.00 4.80 4.60 4.40 4.20 v out i out (3) f osc = 600 khz, i out = 0.1 ma 300 ma S-8365abbba (4) f osc = 600 khz, i out = 300 ma 0.1 ma S-8365abbba 4.00 5.60 5.40 5.20 5.00 4.80 4.60 4.40 4.20 1.0 0.0 t [ms] 0 1600 i out [ma] v out [v] 0.8 0.6 0.4 0.2 200 400 600 800 1000 1200 1400 v out i out t [ms] 0 1600 i out [ma] v out [v] 200 400 600 800 1000 1200 1400 40 35 30 25 20 15 10 5 0 4.00 5.60 5.40 5.20 5.00 4.80 4.60 4.40 4.20 v out i out 3.12 load fluctuations (v out = 5.0 v, v in = 3.3 v, i out = 0.1 ma 300 ma 0.1 ma, pwm / pfm switching control, ta = 25 ) (1) f osc = 1.2 mhz, i out = 0.1 ma 300 ma s-8366aabba (2) f osc = 1.2 mhz, i out = 300 ma 0.1 ma s-8366aabba 4.00 5.60 5.40 5.20 5.00 4.80 4.60 4.40 4.20 1.0 0.0 t [ms] 0 1600 i out [ma] v out [v] 0.8 0.6 0.4 0.2 200 400 600 800 1000 1200 1400 v out i out t [ms] 0 1600 i out [ma] v out [v] 200 400 600 800 1000 1200 1400 40 35 30 25 20 15 10 5 0 4.00 5.60 5.40 5.20 5.00 4.80 4.60 4.40 4.20 v out i out (3) f osc = 600 khz, i out = 0.1 ma 300 ma s-8366abbba (4) f osc = 600 khz, i out = 300 ma 0.1 ma s-8366abbba            
   
  
                t [ms] 0 1600 i out [ma] v out [v] 200 400 600 800 1000 1200 1400 50 40 30 20 10 0 4.00 5.60 5.40 5.20 5.00 4.80 4.60 4.40 4.20 v out i out
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 44 ? reference data reference data is provided to determine specific extern al components. therefore, the following data shows the characteristics of the recommended external components selected for various applications. 1. external parts table 20 efficiency vs. output current characteristics a nd output voltage vs. output current characteristics for external parts (1 / 2) condition product name oscillation frequency control system output voltage l m1 sd 1 S-8365aabba 1.2 mhz pwm 2.5 v nr6028t-2r2m mch3406 rb050la-30 2 S-8365abbba 600 khz pwm 2.5 v ltf5022t-3r3m mch3406 rb050la-30 3 s-8366aabba 1.2 mhz pwm / pfm 2.5 v nr6028t-2r2m mch3406 rb050la-30 4 s-8366abbba 600 khz pwm / pfm 2.5 v ltf5022t-3r3m mch3406 rb050la-30 5 S-8365aabba 1.2 mhz pwm 3.3 v nr6028t-2r2m mch3406 rb050la-30 6 S-8365abbba 600 khz pwm 3.3 v ltf5022t-3r3m mch3406 rb050la-30 7 s-8366aabba 1.2 mhz pwm / pfm 3.3 v nr6028t-2r2m mch3406 rb050la-30 8 s-8366abbba 600 khz pwm / pfm 3.3 v ltf5022t-3r3m mch3406 rb050la-30 9 S-8365aabba 1.2 mhz pwm 5.0 v nr6028t-2r2m mch3406 rb050la-30 10 S-8365abbba 600 khz pwm 5.0 v ltf5022t-3r3m mch3406 rb050la-30 11 s-8366aabba 1.2 mhz pwm / pfm 5.0 v nr6028t-2r2m mch3406 rb050la-30 12 s-8366abbba 600 khz pwm / pfm 5.0 v ltf5022t-3r3m mch3406 rb050la-30 table 20 efficiency vs. output current characteristics a nd output voltage vs. output current characteristics for external parts (2 / 2) condition c in c out r fb1 r fb2 c fb c dd 1 c2012x5r1a106kt grm31cr71a106ka 2 47 k ? 15 k ? 68 pf 0.1 f 2 c2012x5r1a106kt grm31cr71a106ka 2 47 k ? 15 k ? 82 pf 0.1 f 3 c2012x5r1a106kt grm31cr71a106ka 2 47 k ? 15 k ? 68 pf 0.1 f 4 c2012x5r1a106kt grm31cr71a106ka 2 47 k ? 15 k ? 82 pf 0.1 f 5 c2012x5r1a106kt grm31cr71a106ka 2 68 k ? 15 k ? 68 pf 0.1 f 6 c2012x5r1a106kt grm31cr71a106ka 2 68 k ? 15 k ? 82 pf 0.1 f 7 c2012x5r1a106kt grm31cr71a106ka 2 68 k ? 15 k ? 68 pf 0.1 f 8 c2012x5r1a106kt grm31cr71a106ka 2 68 k ? 15 k ? 82 pf 0.1 f 9 c2012x5r1a106kt grm31cr71a106ka 2 110 k ? 15 k ? 56 pf 0.1 f 10 c2012x5r1a106kt grm31cr71a106ka 2 110 k ? 15 k ? 68 pf 0.1 f 11 c2012x5r1a106kt grm31cr71a106ka 2 110 k ? 15 k ? 56 pf 0.1 f 12 c2012x5r1a106kt grm31cr71a106ka 2 110 k ? 15 k ? 68 pf 0.1 f
step-up , super-small package , 1.2 mhz pwm control or pwm / pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 45 the properties of the external parts are shown below. table 21 characteristics of external parts part part name manfuacturer characteristics nr6028t-2r2m taiyo yuden co., ltd. 2.2 h, dcr *1 = 0.020 ? , i max *2 = 4.2 a, l w h = 6.0 6.0 2.8 mm inductor ltf5022t-3r3m tdk corporation 3.3 h, dcr *1 = 0.060 ? , i max *2 = 2.7 a, l w h = 5.0 5.2 2.2 mm diode rb050la-30 rohm co., ltd. v f *3 = 0.45 v, i f *4 = 3.0 a, v r *5 = 30 v l w h = 4.7 2.6 1.05 mm transistor mch3406 sanyo semiconductor co., ltd. v dss *6 = 20 v, v gss *7 = 10 v, i d *8 = 3.0 a, q g *9 = 8.8 nc typ., r ds(on) *10 = 0.082 ? max. (v gs *11 = 2.5 v) l w h = 2.1 2.0 0.85 mm c2012x5r1a106kt 10 f, e dc *12 = 10 v, x5r, l w h = 2.0 1.25 1.45 mm c1005x7r1c104kt tdk corporation 0.1 f, e dc *12 = 16 v, x7r, l w h = 1.0 0.5 0.55 mm capacitor grm31cr71a106ka murata manufacturing, co., ltd. 10 f, e dc *12 = 10 v, x7r, l w h = 3.2 1.6 1.6 mm * 1. dcr : dc resistance * 2. i max : maximum allowable current * 3. v f : forward voltage * 4. i f : forward current * 5. v r : reverse voltage * 6. v dss : drain-source voltage (during short-circuiting between the gate and source) * 7. v gss : gate-source voltage (during short-circuiting between the drain and source) * 8. i d : drain current * 9. q g : gate charge *10. r ds(on ) : on-resistance between the drain and source *11. v gs : gate-source voltage *12. e dc : rated voltage caution the values shown in the characteristics column of table 21 above are based on the materials provided by each manufacture. however, consider the charact eristics of the original materials when using the above products.
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 46 2. output current (i out ) vs. efficiency ( ) characteristics, output current (i out ) vs. output voltage (v out ) characteristics following shows the actual output current (i out ) vs. efficiency ( ) and output current (i out ) vs. output voltage (v out ) characteristics for conditions 1 to 12 in table 20 . condition 1 S-8365aabba (v out(s) = 2.5 v) 0.1 10000 [%] 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v in = 1.8 v 0.1 10000 1 10 100 1000 i out [ma] 2.60 2.55 2.50 2.45 2.40 2.35 2.30 2.25 2.20 2.15 2.10 2.05 2.00 v out [v] v in = 1.8 v condition 2 S-8365abbba (v out(s) = 2.5 v) 0.1 10000 [%] 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v in = 1.8 v 0.1 10000 1 10 100 1000 i out [ma] 2.60 2.55 2.50 2.45 2.40 2.35 2.30 2.25 2.20 2.15 2.10 2.05 2.00 v out [v] v in = 1.8 v condition 3 s-8366aabba (v out(s) = 2.5 v) 0.1 10000 [%] 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v in = 1.8 v 0.1 10000 1 10 100 1000 i out [ma] 2.60 2.55 2.50 2.45 2.40 2.35 2.30 2.25 2.20 2.15 2.10 2.05 2.00 v out [v] v in = 1.8 v condition 4 s-8366abbba (v out(s) = 2.5 v) 0.1 10000 [%] 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v in = 1.8 v 0.1 10000 1 10 100 1000 i out [ma] 2.60 2.55 2.50 2.45 2.40 2.35 2.30 2.25 2.20 2.15 2.10 2.05 2.00 v out [v] v in = 1.8 v
step-up , super-small package , 1.2 mhz pwm control or pwm / pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 47 condition 5 S-8365aabba (v out(s) = 3.3 v) 0.1 10000 [%] 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v in = 1.8 v v in = 2.4 v v in = 3.0 v 0.1 10000 3.5 2.5 3.0 3.2 3.3 2.8 2.6 2.7 2.9 3.1 3.4 1 10 100 1000 i out [ma] v out [v] v in = 1.8 v v in = 2.4 v v in = 3.0 v condition 6 S-8365abbba (v out(s) = 3.3 v) 0.1 10000 [%] 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v in = 1.8 v v in = 2.4 v v in = 3.0 v 0.1 10000 3.5 2.5 3.0 3.2 3.3 2.8 2.6 2.7 2.9 3.1 3.4 1 10 100 1000 i out [ma] v out [v] v in = 1.8 v v in = 2.4 v v in = 3.0 v condition 7 s-8366aabba (v out(s) = 3.3 v) 0.1 10000 [%] 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v in = 1.8 v v in = 2.4 v v in = 3.0 v 0.1 10000 3.5 2.5 3.0 3.2 3.3 2.8 2.6 2.7 2.9 3.1 3.4 1 10 100 1000 i out [ma] v out [v] v in = 1.8 v v in = 2.4 v v in = 3.0 v condition 8 s-8366abbba (v out(s) = 3.3 v) 0.1 10000 [%] 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v in = 1.8 v v in = 2.4 v v in = 3.0 v 0.1 10000 3.5 2.5 3.0 3.2 3.3 2.8 2.6 2.7 2.9 3.1 3.4 1 10 100 1000 i out [ma] v out [v] v in = 1.8 v v in = 2.4 v v in = 3.0 v
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 48 condition 9 S-8365aabba (v out(s) = 5.0 v) 0.1 10000 [%] 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v in = 1.8 v v in = 2.4 v v in = 3.0 v v in = 4.2 v 0.1 10000 5.2 4.2 4.7 4.9 5.0 4.5 4.3 4.4 4.6 4.8 5.1 1 10 100 1000 i out [ma] v out [v] v in = 1.8 v v in = 2.4 v v in = 3.0 v v in = 4.2 v condition 10 S-8365abbba (v out(s) = 5.0 v) 0.1 10000 [%] 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v in = 1.8 v v in = 2.4 v v in = 3.0 v v in = 4.2 v 0.1 10000 5.2 4.2 4.7 4.9 5.0 4.5 4.3 4.4 4.6 4.8 5.1 1 10 100 1000 i out [ma] v out [v] v in = 1.8 v v in = 2.4 v v in = 3.0 v v in = 4.2 v condition 11 s-8366aabba (v out(s) = 5.0 v) 0.1 10000 [%] 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v in = 1.8 v v in = 2.4 v v in = 3.0 v v in = 4.2 v 0.1 10000 5.2 4.2 4.7 4.9 5.0 4.5 4.3 4.4 4.6 4.8 5.1 1 10 100 1000 i out [ma] v out [v] v in = 1.8 v v in = 2.4 v v in = 3.0 v v in = 4.2 v condition 12 s-8366abbba (v out(s) = 5.0 v) 0.1 10000 [%] 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v in = 1.8 v v in = 2.4 v v in = 3.0 v v in = 4.2 v 0.1 10000 5.2 4.2 4.7 4.9 5.0 4.5 4.3 4.4 4.6 4.8 5.1 1 10 100 1000 i out [ma] v out [v] v in = 1.8 v v in = 2.4 v v in = 3.0 v v in = 4.2 v
step-up , super-small package , 1.2 mhz pwm control or pwm / pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 49 3. output current (i out ) vs. ripple voltage (v r ) characteristics following shows the actual output current (i out ) vs. ripple voltage (v r ) characteristics for conditions of 1 to 12 in table 20 . condition 1 S-8365aabba (v out(s) = 2.5 v) condition 2 S-8365abbba (v out(s) = 2.5 v) 0.1 10000 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v r [v] v in = 1.8 v 0.1 10000 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v r [v] v in = 1.8 v condition 3 s-8366aabba (v out(s) = 2.5 v) condition 4 s-8366abbba (v out(s) = 2.5 v) 0.1 10000 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v r [v] v in = 1.8 v 0.1 10000 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v r [v] v in = 1.8 v condition 5 S-8365aabba (v out(s) = 3.3 v) condition 6 S-8365abbba (v out(s) = 3.3 v) 0.1 10000 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v r [v] v in = 1.8 v v in = 2.4 v v in = 3.0 v 0.1 10000 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v r [v] v in = 1.8 v v in = 2.4 v v in = 3.0 v condition 7 s-8366aabba (v out(s) = 3.3 v) condition 8 s-8366abbba (v out(s) = 3.3 v) 0.1 10000 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v r [v] v in = 1.8 v v in = 2.4 v v in = 3.0 v 0.1 10000 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v r [v] v in = 1.8 v v in = 2.4 v v in = 3.0 v
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 50 condition 9 S-8365aabba (v out(s) = 5.0 v) condition 10 S-8365abbba (v out(s) = 5.0 v) 0.1 10000 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v r [v] v in = 1.8 v v in = 2.4 v v in = 3.0 v v in = 4.2 v 0.1 10000 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v r [v] v in = 1.8 v v in = 2.4 v v in = 3.0 v v in = 4.2 v condition 11 s-8366aabba (v out(s) = 5.0 v) condition 12 s-8366abbba (v out(s) = 5.0 v) 0.1 10000 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v r [v] v in = 1.8 v v in = 2.4 v v in = 3.0 v v in = 4.2 v 0.1 10000 100 0 50 70 80 30 10 20 40 60 90 1 10 100 1000 i out [ma] v r [v] v in = 1.8 v v in = 2.4 v v in = 3.0 v v in = 4.2 v
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller rev.1.1 _00 S-8365/8366 series seiko instruments inc. 51 ? marking specification (1) snt-6a (1) to (3) : product code (refer to product name vs. product code) (4) to (6) : lot number snt-6a top view 1 2 3 4 6 5 (1) (4) (2) (5) (3) (6) product name vs. product code (a) S-8365 series (b) s-8366 series product code product code product name (1) (2) (3) product name (1) (2) (3) S-8365aaaaa-i6t1g2 u q a s-8366aaaaa-i6t1g2 u q r S-8365aaaba-i6t1g2 u q c s-8366aaaba-i6t1g2 u q t S-8365aabba-i6t1g2 u q g s-8366aabba-i6t1g2 u q x S-8365abaaa-i6t1g2 u q i s-8366abaaa-i6t1g2 u q z S-8365ababa-i6t1g2 u q k s-8366ababa-i6t1g2 u q 3 S-8365abbba-i6t1g2 u q o s-8366abbba-i6t1g2 u q 7 (2) sot-23-5 (1) to (3) : product code (refer to product name vs. product code) (4) : lot number 5 4 1 3 2 (1) (2) (3) (4) sot-23-5 top view product name vs. product code (a) S-8365 series (b) s-8366 series product code product code product name (1) (2) (3) product name (1) (2) (3) S-8365aaaaa-m5t1s2 u q a s-8366aaaaa-m5t1s2 u q r S-8365aaaba-m5t1s2 u q c s-8366aaaba-m5t1s2 u q t S-8365abaaa-m5t1s2 u q i s-8366abaaa-m5t1s2 u q z S-8365ababa-m5t1s2 u q k s-8366ababa-m5t1s2 u q 3
step-up , super-small package , 1.2 mhz pwm control or pwm/pfm switchable switching regulator controller S-8365/8366 series rev.1.1 _00 seiko instruments inc. 52 (3) sot-23-6 (1) to (3) : product code (refer to product name vs. product code ) (4) : lot number 6 4 1 3 2 (1) (2) (3) (4) sot-23-6 top view 5 product name vs. product code (a) S-8365 series (b) s-8366 series product code product code product name (1) (2) (3) product name (1) (2) (3) S-8365aabba-m6t1s2 u q g s-8366aabba-m6t1s2 u q x S-8365abbba-m6t1s2 u q o s-8366abbba-m6t1s2 u q 7
  
     

  
 
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the information described herein is subject to change without notice. seiko instruments inc. is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. the application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. when the products described herein are regulated products subject to the wassenaar arrangement or other agreements, they may not be exported without authorization from the appropriate governmental authority. use of the information described herein for other purposes and/or reproduction or copying without the express permission of seiko instruments inc. is strictly prohibited. the products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of seiko instruments inc. although seiko instruments inc. exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may occur. the user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue.


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