View BD8355MWV_4073591.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

1/20 www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. regulators ics for digita l cameras and camcorders system switching regulator ic with built-in fet (10v) BD8355MWV description BD8355MWV is a system switching regulator for li 2 cell co mposed of 6 step-down synchronous rectification channels and 1 step-up di rectification channel for led ap plication. using a charge-pump system for high side fet driver and including power mosfet reduce the number of peripher al devices and realize high efficiency. functions 1) includes step-down 6 ch (ch1~6), step-up for led 1ch (7ch) total 7ch included. 2) includes power mosfet for all channels. 3) includes charge-pump circuit for high side driver. 4) operating freq uency of 750 khz. 5) ch1 and 4 are common, 3 and 5 are also common, and others are possible to turn on/off independently. 6) includes short circuit protection (scp), under voltage lock out (uvlo) and thermal shut down (tsd). 7) includes short circuit protection for ch6 (scp6). 8) includes over voltage protection for ch7. 9) thermally enhanced uqfn056v7070 package (7mm7mm, 0.4mm pitch) applications for digital single-lens reflex camera, digital video camera absolute maximum ratings ta 25 parameter symbol ratings unit power supply voltage vcc, vbat, vhx1~6 -0.3~11.0 v vlx1~6 -0.3~vhx v vlx7 -0.3~28.0 v hvreg -0.3~15.0 v ctl14, ctl2, ctl35, ctl6 -0.3~11.0 v ctl7 -0.3~7.0 v maximum current iomaxlx1, lx4, lx5 1.5 a iomaxlx2, lx3 0.8 a iomaxlx6 2.0 a iomaxlx7 +1.0 a power dissipation pd 420 (*1) mw 930 (*2) mw operating temperat ure topr -25~+85 storage temperature tstg -55~+125 junction temperature tjmax 125 *1 without external heat sink, power dissipation degrades by 4.2mw/ above 25 . *2 power dissipation degrades by 9.3mw/ above 25 , when mounted on a 74.2mm74.2mm1.6mmt grass epoxy pcb. no.11036eat20 www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 2/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. recommended operating conditions(ta=-25~+85 ) parameter symbol ratings unit min. typ. max. power supply voltage vcc, vbat, vhx1~6 4.0 7.2 10.0 v vrega output capacitor cvrega 0.47 1.0 2.2 f vregd output capacitor cvregd 0.47 1.0 2.2 f hvreg output capacitor chvreg 0.47 1.0 2.2 f flying capacitor cfly 0.047 0.1 0.22 f oscillator frequency fosc 500 750 1800 khz timing resistor rrt 15 47 82 k ? electrical characteristics(ta=25 ,vcc=vbat=7.2v, fosc=750khz with no designation) parameter symbol limits unit conditions min. typ. max. reference voltage vrega output voltage vrega 3. 54 3.60 3.66 v vrega=-1ma line regulation dvli - - 10 mv vcc=4v~10v, vrega=-1ma load regulation dvlo - - 10 mv vrega=-1ma~-5ma bias voltage vregd output voltage vregd 3. 50 3.60 3.70 v vregd=-10ma charge pump hvreg output voltage hvreg vbat +3.50 vbat +3.60 - v iout=0ma, fb=2.5v output impedance rhvreg - 24 40 ? iout=-30ma, cfly=0.1f oscillator oscillator frequency fosc 650 750 850 khz rt=47k ? oscillator frequency cofficient df - 0 2 % vcc=4v ~ 10v pwm comparator ch7 0% duty threshold voltage vth0 0.2 0.3 - v ch7 max duty dmax 86 92 96 % error amplifier 1 (ch1) threshold voltage veth1 0.790 0.800 0.810 v output voltage l vfbl1 - 0.03 0.2 v inv1=0.9v output voltage h vfbh1 3.3 3.5 - v inv1=0.7v output sink current isink1 4.0 17.0 - ma inv1=0.9v, fb1=1.75v output source current isource1 - -140 -70 a inv1=0.7v, fb1=1.75v input bias current ibias1 -100 0 100 na inv1=0v error amplifier 2 (ch2~6) threshold voltage veth 0.990 1.000 1.010 v output voltage l vfbl - 0.03 0.2 v inv=1.1v output voltage h vfbh 3.3 3.5 - v inv=0.9v output sink current isink 4. 0 17.0 - ma inv=1.1v, fb=1.75v output source current isource - -140 -70 a inv=0.9v, fb=1.75v input bias current ibias -100 0 100 na inv=0v error amplifier 3 (ch7) threshold voltage veth7 0.285 0.300 0.315 v output voltage l vfbl7 - 0.03 0.2 v inv=0.4v output voltage h vfbh7 3.3 3.5 - v inv=0.2v output sink current isink7 4. 0 17.0 - ma inv=0.4v, fb=1.75v output source current isource7 - -140 -70 a inv=0.2v, fb=1.75v input bias current ibias7 -50 0 50 na inv7=0v www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 3/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. parameter symbol limits unit conditions min. typ. max. soft start ch1 soft start time tss1 1.3 2.5 3.7 msec ch1 ch2-6 soft start time tss2-6 1.5 3.1 4.6 msec ch2 ~ 6 ch7 duty restriction time tdtc7 12.0 15.0 18.0 msec ch7 driver ch1~6 lx pull-down resistor rlx 300 500 700 ? ctl=0v ch1 high side nch fet on resistor ronh1 - 0.27 0.44 ? lx1=-50ma ch1 low side nch fet on resistor ronl1 - 0.15 0.24 ? lx1=50ma ch2 high side nch fet on resistor ronh2 - 0.42 0.68 ? lx2=-50ma ch2 low side nch fet on resistor ronl2 - 0.30 0.48 ? lx2=50ma ch3 high side nch fet on resistor ronh3 - 0.52 0.84 ? lx3=-50ma ch3 low side nch fet on resistor ronl3 - 0.20 0.32 ? lx3=50ma ch4 high side nch fet on resistor ronh4 - 0.20 0.32 ? lx4=-50ma ch4 low side nch fet on resistor ronl4 - 0.30 0.48 ? lx4=50ma ch5 high side nch fet on resistor ronh5 - 0.23 0.37 ? lx5=-50ma ch5 low side nch fet on resistor ronl5 - 0.22 0.36 ? lx5=50ma ch6 high side nch fet on resistor ronh6 - 0.22 0.36 ? lx6=-50ma ch6 low side nch fet on resistor ronl6 - 0.30 0.48 ? lx6=50ma ch7 nch fet on resistor ron7 - 0.50 0.80 ? lx7=50ma under voltage lock out(uvlo) threshold voltage1 vthuvlo1 3.3 3.4 3.5 v vcc pin voltage hysteresis voltage dvuv 25 100 200 mv vcc pin voltage threshold voltage2 vthuvlo2 - 2.5 2.7 v vrega pin voltage threshold voltage3 vthuvlo3 - 3.15 3.35 v vregd pin voltage short circuit protection(scp) timer start voltage vstart 2.65 2.8 2.95 v fb1~5, 7 pin v oltage ch6 timer start voltage vstart6 0.45 0.50 0.55 v inv6 pin voltage scp pin threshold voltage vscpth 0.9 1.0 1.1 v scp6 pin threshold voltage vscp6th 0.9 1.0 1.1 v scp pin source current iscp -1.4 -1.0 -0.6 a scp=0.1v scp6 pin source current iscp6 -1.4 -1.0 -0.6 a scp6=0.1v scp pin stand-by voltage vstscp - 10 100 mv ctl=3v, fb=0v scp6 pin stand-by voltage vstscp6 - 10 100 mv ctl6=3v, inv6=1.0v over voltage protection(ovp) ch7 ovp threshold voltage vovp7 26.5 28.0 29.5 v vo7 pin voltage control ctl1-6 control voltage active vctlh 2 - vcc v non-active vctll -0.3 - 0.4 v ctl7 control voltage active vctlh 2 - 5.5 v non-active vctll -0.3 - 0.4 v ctl pin pull-down resistor rctl 0.6 1.0 1.4 m ? whole device stand-by current vcc pin istb1 - 0 5 a ctl=0v hx pin istb2 - 0 5 a hx1~6=10v, sum of hx1~6 lx7 pin istb3 - 0 5 a lx7=28v circuit current icc - 6.0 9.0 ma ctl=3v, fb=2.5v this product is not designed for normal operation within a radioactive environment. www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 4/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. package dimensions fig. 1 package dimension www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 5/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. pin assignments pin no. pin name pin descriptions pin no. pin name pin descriptions 1 inv7 ch7 error amplifier negative i nput pin 29 ctl35 ch3, 5 on/off control pin 2 fb6 ch6 error amplifier output pin 30 ctl14 ch1, 4 on/off control pin 3 inv6 ch6 error amplifier negative input pin 31 pgnd12 ground pin for ch1, 2 output 4 fb5 ch5 error amplifier output pin 32 pgnd12 ground pin for ch1, 2 output 5 inv5 ch5 error amplifier negative input pin 33 lx2 pin for connecting to inductor of ch2 6 gnd ground pin 34 hx2 ch2 highside transistor and driver supply voltage 7 fb4 ch4 error amplifier output pin 35 hx3 ch3 highside transistor and driver supply voltage 8 inv4 ch4 error amplifier negative input pin 36 lx3 pin for connecting to inductor of ch3 9 inv3 ch3 error amplifier negative input pin 37 pgnd34 ground pin for ch3, 4 output 10 fb3 ch3 error amplifier output pin 38 pgnd34 ground pin for ch3, 4 output 11 inv2 ch2 error amplifier negative input pin 39 lx4 pin for connecting to inductor of ch4 12 fb2 ch2 error amplifier output pin 40 lx4 pin for connecting to inductor of ch4 13 scp6 ch6 short circuit protection delay time setting pin with external capacitor 41 ctl6 ch6 on/off control pin 14 ctl7 ch7 on/off control pin 42 ctl2 ch2 on/off control pin 15 inv1 ch1 error amplifier negative input pin 43 hx 4 ch4 highside transistor and driver supply voltage 16 fb1 ch1 error amplifier output pin 44 hx4 ch4 highside transistor and driver supply voltage 17 scp ch1-5 and ch7 short circui t protection delay time setting 45 hx5 ch5 highside transistor and driver supply voltage pin 18 rt oscillator frequency adjustment pin with exter nal 46 lx5 pin for connecting to inductor of ch5 19 vrega 3.6v reference output voltage pin 47 pgnd56 ground pin for ch5, 6 output 20 vcc input supply voltage pin 48 pgnd56 ground pin for ch5, 6 output 21 vregd 3.6v lowside transistor bias voltage output pin 49 lx6 pin for connecting to inductor of ch6 22 cminus pin for connecting chargepump flying capacito r 50 lx6 pin for connecting to inductor of ch6 23 hvreg chargepump voltage output pin 51 hx6 ch6 highside transistor and driver supply voltage 24 cplus pin for connecting chargepump flying capacitor 52 hx6 ch6 highside transistor and driver supply voltage 25 vbat chargepump input supply voltage pin 53 lx7 pin for connecting to inductor of ch7 26 hx1 ch1 highside transistor and driver supply voltage 54 pgnd7 ground pin for ch7 output 27 lx1 pin for connecting to inductor of ch1 55 vo7 voltage monitor pin for ch7 over voltage protection 28 lx1 pin for connecting to inductor of ch1 56 fb7 ch7 error amplifier output pin pin assignments fig. 2 pin assignments www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 6/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. block diagram and application circuit uvlo scp rt 2.8v vregd scp timer inv1 erroramp1 ch1 step down dc/dc (current mode) lx1 pgnd12 hx1 a vo1=1.15v iomax=1.2a a driver driver unreg 0.8v fb1 hvreg vregd ch2 step down dc/dc (current mode) ch3 step down dc/dc (current mode) ch4 step down dc/dc (current mode) ch5 step down dc/dc (current mode) ch6 step down dc/dc (current mode) inv2 erroramp2 lx2 hx2 b vo2=3.8v iomax=0.6a b driver driver 1.0v fb2 hvreg vregd inv3 erroramp3 lx3 hx3 c vo3=1.8v iomax=0.6a c driver driver 1.0v fb3 hvreg vregd inv4 erroramp4 d driver driver 1.0v fb4 hvreg vregd inv5 erroramp5 lx5 hx5 e vo5=3.2v iomax=1.2a e driver driver 1.0v fb5 hvreg vregd inv6 erroramp6 f driver driver 1.0v fb6 hvreg vregd inv7 erroramp7 driver 0.3v vregd ch7 step up dc/dc (voltage mode) g osc shut down vregd=3.6v c- c+ hvreg pgnd7 lx7 lx6 pgnd56 hx6 f vo6=4.2v iomax=1.8a lx4 pgnd34 hx4 d vo4=4.6v iomax=1.2a vo7=wled iomax=50ma ocp vo7 ctl7 latch ovpcomp fb7 scp6 scp6 timer ss timer 0.5v protection vrega vrega=3.6v vbat cp driver cp_sw cp_sw vregd 4.7uf 10uf 4.7uh 4.7uf 10uf 10uh 4.7uf 10uh 10uf 4.7uf 10uh 10uf 4.7uf 10uh 10uf 4.7uf 10uh 10uf 1.0uf 33uh 1uf 10 1.0uf 0.1uf 0.1uf 1.0uf 1.0uf vcc gnd 10uf 47k 0.047uf 0.047uf g 2.7k 6800pf 30k 560pf 39k 1000pf 51k 16k 20k 1000pf 33k 15k 39k 1000pf 20k 12k 330pf 43k 91k//130k 47k 1000pf 56k 20k 16k 330pf 33k 75k 3.3k 220pf 6.8k 330pf ctl35 ctl2 ctl6 ctl7 ctl14 36k+36k fig. 3 application circuit * we are confident that the above applied circuit diagra m should be recommended, but please thoroughly confirm its cha- racteristics when using it. in addition, when using it with the external circuit?s constant changed, please make a decision that allows a sufficient margin in light of the fluctuations of external components a nd rohm?s ic in terms of not only static characteristic but also transient characteristic. www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 7/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. timing chart fig. 4 ch1-6 startup sequence fig. 5 ch7 startup sequence fig. 6 stop sequence www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 8/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. functional description / peripheral devices setting 1. internal regulator (vrega, vregd) both vrega and vregd are internal regulator of 3.6 v output. bypass vrega/vregd to gnd with a capacitor be- tween 0.47 f and 2.2 f. in addition, it needs care fo r the voltage between vrega and vregd not to excess 0.3 v to avoid ic malfunctions. 2. control block (shut down) inputting voltages to ctl14, 2, 35, 6, and 7 control on/off of respective channels. note that it is impossible to inde- pendently control ch1 and 4, and to independently control ch3 and 5. in addition, turn on any ctl1-6 and wait 500 usec before turning on ctl7. input higher voltage than 2 v to ctl14, 2, 35, or 6 to turn on each channel. open or in- put voltage -0.3 ~ 0.4 v to those to turn off. input 2 ~ 5.5 v to ctl7 to turn on ch7. open or input voltage -0.3 ~ 0.4 v to ctl7 to turn off. the states of output terminals (lx1-7), fb terminals, scp/scp6 terminals, and internal regulator (vrega and vregd) are written below. each ctl terminal contains pull down resistor of 1m ? (typ.) 142356712345671234567 lllllllllll h-z lllllllllll hllllallall h-z allalllaaal lhllllallll h-z lalllllaaal llhllllalal h-z llalallaaal lllhlllllla h-z lllllalaala l*l*l*l*hl*l*l*l*l*l*al*l*l*l*l*l*aaaal* hhhhhaaaaaaaaaaaaaaaaaa a: active scp6 * turn on any ctl1-6 before turn on ctl7. conditions of lx1 6, fb1 6, scp6 are changed with active channel. ctl lx fb vrega vregd scp 3. output voltage/current setting fig. 7 setting of feedback resistance (a) setting output voltage of ch1-6 the reference voltages of error amp. are 0.8 v (ch1) and 1 v (ch2-6). the output voltages are determined as equation (1) and (2). set the value of feedback resist ance r1 and r2 which are connected to inv1-6 pin. (b) setting output current of ch7 the reference voltage of ch7 error amp. is 0.3 v. the current flowing led is determined as equation (3). set the value of feedback resistance r3, cons idering the tolerance current of led. 4. startup/stop sequence to avoid rush current on startup, each channel has soft start function. the output voltage of ch1 reaches to the target in tss1=2.5msec (typ.) and the output voltage of ch2 ~ 6 reac hes to the target in tss2-6=3 .1msec (typ.). in case of ch7, the output of error amplifier is restricted in tdtc7=15msec (typ.). note that tss1-6, tdtc7 vary from typical value tt yp as following with setting of switching frequency. 5. protection matrix the following table displays state of outputs when protection is operating. lx1-5 lx6 lx7 fb1-6 fb7 vrega vregd hvreg scp scp6 short circuit protection (ch1-5,7) h-z a h-z a a a a a - a short circuit protection (ch6) a h-z a a a a a a a - under voltage lockout (vcc) h-z h-z h-z na na a a na na na under voltage lockout (vrega) h-z h-z h-z na na - a na na na under voltage lockout (vregd) h-z h-z h-z na na a - na na na under voltage lockout (hvreg) h-z h-z a na a a a - na na thermal shutdown tsd h-zh-zh-znanananananana a: active na: non-active www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 9/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. 6. short circuit protection (scp, scp6) for ch1 ~ 5 and 7, monitoring the output voltages of error am- plifier (fb voltage), if the volt ages become more than 2.8 v, the output of scpcomp will become ?l ? level, and transistor ?m1? will turn off. thus the current ?1a? be supplied to cscp the capacitor connected to scp terminal. the outputs stop when scp terminal voltage reaches 1 v. the time from short circuit detect to outputs stop (tscp) is set as shown below. tscp[s] = 1.0 cscp[f] on the other hand, short circuit of ch6 is detected when the error amplifier input of ch6 (inv6) becomes less than 0.5 v. the time from short circuit detect to output stop (tscp6) is set with cscp6 as tscp. to release from short circuit pr otection latch state, turn ctl terminal to ?l? level. connect scp/scp6 terminal to gnd when the function of short circuit protection is not used. 7. over voltage protection(ovp) in ch7, when led is open, inv7 become l and output voltage increase suddenly. if that condition continues lx7 voltage in- crease and exceed break down voltage.ch7 has over voltage protection circuit (ovp) not to exceed break down voltage. when the voltage of vo7 terminal becomes more than 28v (typ.), ovp function works and ch7 stops operating. once ovp is detected, ch7 becomes la tch state. to release from latch state, turn off ctl7. 8. thermal shutdown circuit (tsd) the tsd circuit protects the ic against thermal runaway and heat damage. the tsd thermal sensor detects junction tem- perature. when the temperatur e reaches the tsd threshold (typ: 175), the circuit switches the outputs of all channels, vrega, and vregd off. at the same time, it sets the fb1-7 terminals ?l? level. the hysteresis width (typ: 15) provided between the tsd function start temperature (threshold) and the stop temperature serves to prevent malfunctions from tem- perature fluctuations. 9. under voltage lockout (uvlo) under voltage lockout prevents ic malfunctions that could oth- erwise occur due to power supply fluctuation at power on or abrupt power off. this system turns off each channel out- put when the vcc voltage becomes lower than 3.4 v. the uvlo detect voltage has 0.1 v hysteresis to prevent malfunc- tions from power supply fluctuation. in addition, uvlo works when an internal regulator voltage drops down. the outputs of all channels are turned off when vregd becomes lower t han 3.15 v or vrega becomes lower than 2.4 v. moreover, the outputs of ch1-6 are turned off when hvreg becomes lower than vcc+2.5 v. the switching frequency the switching frequency is set by the resistor connected to the rt terminal. set the frequency with referring fig. 19. fb6 inv6 scp6 c scp6 1a 0.5v vo6 m2 ` ss timer fb1 fb1 inv1 fb2 fb2 inv2 fb3 fb3 inv3 fb4 fb4 inv4 fb5 fb5 inv5 fb7 fb7 inv7 scp c scp 1a 2.8v vo1 vo2 vo3 vo4 vo5 vo7 m1 fig. 8 block diagram of short circuit protection circuit. fig. 9 block diagram of short circuit protection6 circuit. www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 10/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. 10. selection of output inductor a combination of the output inductor and the output capacitor form a second-order smoothing filter for switch waveform and provide dc output voltage. if the induc tance is low, its package size is minimized, but the penalty is higher ripple current, with lower efficiency and an increase of output no ise. conversely, higher inductance increases the package size, but lowers ripple current, consequently, and suppress the out put ripple voltage. generally, set inductance as that the ripple current is about 20-50 % of their output current. below equations are the relations of between inductance and ripple current. (step down) l[h] (v in [v] \ v out [v]) i l [a] v out [v] v in [v] 1 f osc [hz] (step up) l[h] (v out [v] \ v in [v]) i l [a] v in [v] v out [v] 1 f osc [hz] l: inductance v in : input voltage v out : output voltage S i l : ripple current fosc: switching frequency i out : output load current in addition, set larger values than i peak that is calculated from below equation. (step down) i peak =i out i l 2 ? (step up) i peak = i out v out v in ? 100 ? ? + i l 2 ? : efficiency[%] 11. phase compensation the components shown will add poles and zeros to the loop gain as given by the following expression: ? cfb adds a pole whose frequency is given by: (a: error amplifier open loop gain) ? rfb adds a zero whose frequency is given by: ? the output capacitor adds both a pole and a zero to the loop: where, rl is output load resi stance, and esr is the equivalent series resist ance of the output capacitor. cfb forms a pole and a zero. changing the value of cfb moves the frequency of both the pole and the zero. the cfb pole is typically referred to as the dominant pole, and its primary f unction is to roll off loop gain and reduce the bandwidth. the rfb zero is required to add some positive phase shift to offset some of the negativ e phase shift from the two low- frequency poles. without this zero, these two poles would cause -180 of phase shift at the unity-gain crossover, which is clearly unstable. 12. precaution in the layout of printed circuit board ? when switching regulator is operating, large current flow through the path of power supply ? inductor ? output capacitor. in laying a pattern of the board, make this line as short and wide as possible to decrease impedance. ? the switching noise on inv1-7 terminals may cause the out put oscillation. to avoid interference of the noise, make the line between voltage divider resistor and inv terminals as shortened as possible a nd not crossed at switching line. cout rl vout r1 erroramp r2 (inv) rfb cfb (fb) vout application fig. 10 phase compensation setting www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 11/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. reference data 0.00 2.00 4.00 6.00 8.00 10.00 0 2 4 6 8 10 12 icc [ma] vcc [v] fig. 11 circuit current vs supply voltage (all cannels on) 0.00 1.00 2.00 3.00 4.00 5.00 0 2 4 6 8 10 12 vrega [v] vcc [v] fig. 12 vrega vs supply voltage 3.56 3.58 3.60 3.62 3.64 -40 -20 0 20 40 60 80 100 vrega [v] ambient temperature [ ] fig. 13 vrega vs ambient temperature 0.76 0.78 0.80 0.82 0.84 -40 -20 0 20 40 60 80 100 inv1 threshold [v] ambient temperature [ ] fig. 14 ch1 erroramp. inv threshold vs ambient temperature 0.96 0.98 1.00 1.02 1.04 -40 -20 0 20 40 60 80 100 inv2 threshold [v] ambient temperature [ ] fig. 15 ch2 erroramp. inv threshold vs ambient temperature 0.96 0.98 1.00 1.02 1.04 -40 -20 0 20 40 60 80 100 inv6 threshold [v] ambient temperature [ ] fig. 16 ch6 erroramp. inv threshold vs ambient temperature 0.26 0.28 0.30 0.32 0.34 -40 -20 0 20 40 60 80 100 inv7 threshold [v] ambient temperature [ ] fig. 17 ch7 erroramp. inv threshold vs ambient temperature 600 650 700 750 800 850 900 -40 -20 0 20 40 60 80 100 frequency[khz] ambient temperature [ ] \ conditions \ ? rt=47k fig. 18 frequency vs ambient temperature www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 12/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. 100 1000 10000 10 100 frequency [khz] rt [k ? ] fig. 19 switching frequency vs timing resistance 0.0 1.0 2.0 3.0 4.0 5.0 0 1 2 3 4 vrega [v] ctl [v] fig. 20 ctl terminal characteristic 1msec ctl14 vo 1 (0.5v/div) lx1 (5v/div) iin (50ma) fig. 21 ch1 startup waveform 1msec ctl14 vo 1 (0.5v/div) lx1 (5v/div) iin (50ma) fig. 22 ch1 stop waveform 1msec ctl2 vo 2 (2v/div) lx2 (5v/div) iin (50ma) fig. 23 ch2 startup waveform 1msec ctl2 vo 2 (2v/div) lx2 (5v/div) iin (50ma) fig. 24 ch2 stop waveform 1msec ctl35 vo 3 (1v/div) lx3 (5v/div) iin (50ma) fig. 25 ch3 startup waveform 1msec ctl35 vo 3 (1v/div) lx3 (5v/div) iin (50ma) fig. 26 ch3 stop waveform www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 13/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. 1msec ctl14 vo 4 (2v/div) lx4 (5v/div) iin (50ma) fig. 27 ch4 startup waveform 1msec ctl4 vo 4 (2v/div) lx4(5v/div) iin (50ma) fig. 28 ch4 stop waveform 1msec ctl35 vo 5 (2v/div) lx5 (5v/div) iin (50ma) fig. 29 ch5 startup waveform 1msec ctl35 vo 5 (2v/div) lx5 (5v/div) iin (50ma) fig. 30 ch5 stop waveform 1msec ctl6 vo 6 (2v/div) lx6 (5v/div) iin (100ma) fig. 31 ch6 startup waveform 1msec ctl6 vo 6 (2v/div) lx6 (5v/div) iin (100ma) fig. 32 ch6 stop waveform 2msec ctl7 vo 7 (3v/d iv) offset: 7.2v lx7 (8v/div) iin (300ma) fig. 33 ch7 startup waveform 2msec ctl7 vo 7 (3v/d iv) offset: 7.2v lx7 (8v/div) iin (300ma) fig. 34 ch7 stop waveform www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 14/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. 50 55 60 65 70 75 80 85 90 95 100 0 200 400 600 800 1000 1200 1400 efficiency [%] iout [ma] vbat=4.2v vbat=5.0v vbat=7.2v vbat=8.4v vbat=10v l1: dem3518c 4.7uh (toko) vo1=1.15v fosc=750khz fig. 35 efficiency vs load current (ch1) 50 55 60 65 70 75 80 85 90 95 100 0 100 200 300 400 500 600 700 800 efficiency [%] iout [ma] vbat=4.2v vbat=5.0v vbat=7.2v vbat=8.4v vbat=10v l2: dem3518c 10uh (toko) vo2=3.8v fosc=750khz fig. 36 efficiency vs load current (ch2) 50 55 60 65 70 75 80 85 90 95 100 0 100 200 300 400 500 600 700 800 efficiency [%] iou t [ma] vbat=4.2v vbat=5.0v vbat=7.2v vbat=8.4v vbat=10v l3: dem3518c 10uh (toko) vo3=1.8v fosc=750khz fig. 37 efficiency vs load current (ch3) 50 55 60 65 70 75 80 85 90 95 100 0 200 400 600 800 1000 1200 1400 efficiency [%] iout [ma] vbat=5.5v vbat=7.2v vbat=8.4v vbat=10v l4: dem3518c 10uh (toko) vo4=4.6v fosc=750khz fig. 38 efficiency vs load current (ch4) 50 55 60 65 70 75 80 85 90 95 100 0 200 400 600 800 1000 1200 1400 efficiency [%] iou t [ma] vbat=4.2v vbat=5.0v vbat=7.2v vbat=8.4v vbat=10v l5: dem3518c 10uh (toko) vo5=3.2v fosc=750khzv fig. 39 efficiency vs load current (ch5) 50 55 60 65 70 75 80 85 90 95 100 0 200 400 600 800 1000 1200 1400 1600 1800 2000 efficiency [%] iout [ma] vbat=5.5v vbat=7.2v vbat=8.4v vbat=10v l6: dem4518c 10uh (toko) vo6=4.2v fosc=750khz fig. 40 efficiency vs load current (ch6) 50 55 60 65 70 75 80 85 90 95 100 0 10203040506070 efficient [%] iou t [ma] vbat=10v vbat=8.4v vbat=7.2v vbat=5.0v vbat=4.2v l7: nr3015t330m 33uh (taiyo yuden) led x 4 fosc=750khzv fig. 41 efficiency vs load current (ch7) www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 15/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. power dissipation reduction fig. 42 power dissipation vs ambient temperature www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 16/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. pin equivalent circuit pin name equivalent circuit pin name equivalent circuit inv1 inv2 inv3 inv4 inv5 inv6 inv7 gnd inv vrega fb1 fb2 fb3 fb4 fb5 fb6 fb7 ctl14 ctl2 ctl35 ctl6 ctl7 scp scp6 rt vcc vrega gnd vregd cminus www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 17/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. pin name equivalent circuit pin name equivalent circuit hvreg cplus vbat hvreg vbat cplus vcc gnd hx1 lx1 hx2 lx2 pgnd12 hx3 lx3 hx4 lx4 pgnd34 hx5 lx5 hx6 lx6 pgnd56 hx pgnd lx gnd hvreg vregd lx7 pgnd7 vo7 www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 18/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. output pin vcc counterdurrent prevention di bypass di notes for use 1.) absolute maximum ratings this product is produced with strict quality control. howeve r, the ic may be destroyed if operated beyond its absolute maximum ratings. if the device is destroyed by exceedi ng the recommended maximum ratings, the failure mode will be difficult to determine (e.g. short mode, open mode). therefor e, physical protection counter-measures (like fuse) should be implemented when operating conditions beyon d the absolute maximum ratings anticipated. 2.) gnd potential ensure a minimum gnd pin potential in all operating conditi ons. in addition, ensure that no pins other than the gnd pin carry a voltage lower than or equal to the gnd pi n, including during actual transient phenomena. 3.) thermal design use a thermal design that allows for a sufficient margin in light of the power dissipation (p d) in actual operating condi- tions. 4.) inter-pin shorts and mounting errors use caution direction and position the ic for mounting on printed circuit boards . improper mounting may result in dam- age the ic. in addition, output-output short and output-po wer supply/ground short condition may destroy the ic 5.) operation in a str ong electromagnetic field exposing the ic within a strong electric /magnetic field may cause malfunction. 6.) common impedance power supply and ground wiring should reflect consideration of the need to lower common impedance and minimize ripple as much as possible (by making wiring as short and th ick as possible or rejecting ripple by incorporating induc- tance and capacitance). 7.) voltage of ctl pins the threshold voltage of ctl pins are 0.4 v and 2.0 v. standb y state is set below 0.4 v while running state is set beyond 2.0 v. the region between 0.4 v and 2.0 v is not recommended and may cause improper operation. the rise and fall time must be under 10 msec. in case to put capacitors to ctl pins, it is recommended using under 0.01f. the maximum permissible voltage of ctl7 is 5.5 v. ctl7 pin should not be connected to vcc voltage. turn on any ctl1-6 and wait more than 500 usec before turn on ctl7. 8.) thermal shutdown circuit (tsd circuit) the ic incorporates a built-in thermal shutdown circuit (tsd ci rcuit). the tsd circuit is designed only to shut the ic off to prevent runaway thermal operation. it is not designed to protect the ic or guar antee its operation. do not continue to use the ic after operating this circuit or use the ic in an environment where the operation of this circuit is assumed. 9.) applications with modes that vcc /gnd and other pins except lx and hvre g potential are reversed may cause dam- age internal ic circuits. in addition, modes that each pins si nk current may also cause dam age the circuits. therefore, it is recommended to insert a diode to prevent back current flow or bypass diodes. www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 19/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. parasitic element (terminal a) gnd b c e parasitic element neighboring element parasitic element resistor p-board gnd p (terminal a) p n transistor (npn) gnd gnd (terminal a) parasitic element p-board (terminal b) gnd 10.) rush current at the time of power supply injection. an ic which has plural power supplies could have momentary ru sh current at the time of power supply injection. please take care about power supply coupling capacity and width of power supply and gnd pattern wiring 11.) please use it so that vcc and pvcc terminal should not exceed the absolute maximum ratings. ringing might be caused by l element of the pattern according to the posit ion of the input capacitor, and ratings be exceeded. please will assume the example of the reference ,the distance of ic and capacitor, use it by 5.0mm or less when thickness of print pattern are 35um, pattern width are 1.0mm. 12.) testing on application boards when testing the ic on an application board, connecting a ca pacitor to a pin with low impedance subjects the ic to stress. always discharge capacitors after each process or st ep. ground the ic during assembly steps as an antistatic measure, and use similar caution when tr ansporting or storing the ic. always turn the ic?s power supply off before connecting it to or removing it from a jig or fixture during the inspection process. 13.) thermal fin. there is no problem in the operating of ic even if the thermal fin on the back of package doesn?t connect anywhere. but it is recommended to connect gnd on the pcb board for radiation. 14.) ic terminal input this ic is a monolithic ic that has a p- board and p+ isolat ion for the purpose of keeping distance between elements. a p-n junction is formed between the p-layer and the n-layer of each element, and various types of parasitic elements are then formed. for example, an applicati on where a resistor and transistor are connected to a terminal (shown in fig.43) when gnd > (terminal a) at the resist or and gnd > (terminal b) at the trans istor (npn), the p-n junction oper- ates as a parasitic diode when gnd > (terminal b) at the transistor (npn), a parasi tic npn transistor operates as a result of the n layers of other elements in the proximity of the aforementioned parasitic diode. parasitic elements are structurally inevitable in the ic due to electric potential relationships. the operation of parasitic elements induces the interference of circuit operations, causing malfunctions and possibly the destruction of the ic. please be careful not to use the ic in a way that would caus e parasitic elements to operate. for example, by applying a voltage that is lower than the g nd (p-board) to the input terminal. fig. 43 simple structure of bipolar ic (sample) www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 20/20 BD8355MWV www.rohm.com 2011.12 - rev. a ? 2011 rohm co., ltd. all rights reserved. ordering part number b d 8 3 5 5 m w v - e 2 part no. part no. package mwv: uqfn056v7070 packaging and forming specification e2: embossed tape and reel (unit : mm) uqfn056v7070 0.08 s s 42 29 1 14 56 43 15 28 0.02 +0.03 - 0.02 1pin mark 0.2 +0.05 -0.04 c0.2 4.7 0.1 7.0 0.1 7.0 0.1 0.5 0.1 0.4 4.7 0.1 0.9 1.0max (0.22) ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 1500pcs e2 () direction of feed reel 1pin www.datasheet.co.kr datasheet pdf - http://www..net/
r1120 a www.rohm.com ? 2011 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specied herein is subject to change for improvement without notice. the content specied herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specied in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specied herein is intended only to show the typical functions of and examples of application circuits for the produc ts. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, re or any other damage caused in the event of the failure of any product, such as derating, redundancy, re control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel- controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specied herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law. www.datasheet.co.kr datasheet pdf - http://www..net/

▲Up To Search▲

Price & Availability of BD8355MWV

	To Download BD8355MWV Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .