View TB7102F_4721750.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

TB7102F 2007-06-20 1 toshiba bicd integrated ci rcuit silicon monolithic TB7102F step-down dc-dc converter ic the TB7102F is a single-chip step-down dc-dc converter ic. equipped with a built-in high-speed and low on-resistance power mosfet, and utilizing a synchronous rectifier circuit, this ic can achieve high efficiency. features ? capable of high current drive (i out = maximum of 1 a), using only a few external components ? high efficiency ( = 95% ) (@v in = 5v, v out = 3.3v, and i out = 300 ma). ? operating voltage (v in ) range: 2.7v to 5.5 v ? high oscillation frequency of 1 mhz (typ.), making it possible to use small external components. ? uses internal phase compensation, achieving high efficiency using only a few external components. ? a small surface mount-type ceramic capacitor can be used as an output smoothing capacitor. ? housed in a small surface-mount package (ps-8) with low thermal resistance. ? under voltage lock out (u.v.l.o), heat protecti on, and over current protection is built into. pin assignment marking due to its mos structure, this product is sensit ive to electrostatic discharge. handle with care. son8-p-0303-0.65a weight : 0.017 g (typ.) 1 2 3 4 8 7 6 5 l x pgnd v in en v fb n.c n.c sgnd 7102 part number ? the dot ( ? ) on the top surface indicates pin 1. *: lot number manufacturing week code (the first week of the year is 01,continuing up to 52 or 53) manufacturing year code (last digit of the year of manufacture) * the lot number comprises three numerals. the first num eral represents the last digit of the year of manufacture, and the following two digits indicate the week of manufacture, beginning with 01 and continuing to either 52 or 53.
TB7102F 2007-06-20 2 how to order product no. package type and capacity TB7102F(te85l,f) emboss taping (3000pcs / reel ) block diagram pin descriptions pin no. pin symbol pin description 1 pgn power ground 2 v in input pin. this pin is plac ed in the standby state if v enb = low. 1 a or lower operating current. 3 en enable pin. this pin is connec ted to the cmos inverter. applying 3.5 v or higher (@ v in = 5 v) to this pin starts the inter nal circuit switching control. 4 sgnd signal ground 5 n.c. no connection 6 n.c. no connection 7 v fb output voltage feedback pin. this is connected to the internal error amplifier, which is supplied with a reference voltage of 0.8 v (typ.). 8 l x switching pin. this pin is connected to high side pch mos fet and low side nch mos fet. pgnd sgnd l x en v in driver oscillator current detection + - driver v fb + - v comp error amplifier slope compensation + - control logic phase com p ensation pwm comparator 0.8v(typ.) heat protection under voltage lock out soft start reference volage
TB7102F 2007-06-20 3 timing chart overheat state operation low voltage operation normal operation osc 0 i out i l v out v comp 0 t v lx t on 0 0 0 0 osc v lx t ch 0 v in 0 osc v lx 0 0 the peak switch current is determined v comp . hysteresis: 25 c (typ.) hysteresis: 0.1 v (typ) t ch increase osc : i nterna l osc ill ator output vo l tage i out : load current v out : output voltage v comp : output voltage of error amplifier i l : inductor current v lx : lx pin voltage v in : input pin voltage t ch : channel temperature
TB7102F 2007-06-20 4 absolute maximum ratings (ta = 25c) characteristics symbol rating unit input voltage v in -0.3 6 v switch pin voltage v lx -0.3 6 v feedback pin voltage v fb -0.3 6 v enable pin voltage v en -0.3 6 v input-enable pin voltage v en -v in v en -v in <0.3 v power dissipation (note 1) p d 0.7 w operating temperature t opr -40 85 o c operating junction temperature t jopr -40 125 o c channel temperature t ch 150 o c storage temperature t stg -55 150 o c note 2: using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the significant change in temperature, etc.) may signi ficantly reduce the reliability of this product even if the operating conditions (i.e. operating temper ature/current/voltage, etc. ) are within the absolute maximum ratings and the operating ranges. please consult the toshiba semiconductor reliability handbook (?handling precautions?/derating concept and methods) and individual reliability data (i.e. reliability test report and estimated failure rate, etc) wh en designing the appropriate reliability while. thermal resistance characteristic characteristics symbol max unit thermal resistance, channel and ambient r th (ch-a) 178.6 (note 1) c /w (note 1) glass epoxy board material : fr-4 25.4 25.4 0.8 (unit: mm)
TB7102F 2007-06-20 5 electrical characteristics (unless otherwise specified: tj = 25 c and v in = 2.7 to 5.5 v) characteristics symbol test circuit test condition min typ. max unit operating supply voltage v in(opr) 2.7 5.5 v i in(1) v in = 5v, v en = 5v, v fb =5v 0.68 0.9 ma operating current i in(2) v in = 2.7v, v en = 2.7v, v fb =2.7v 0.55 0.7 ma i in(stby)(1) v in = 5v, v en = 0v 1 a standby current i in(stby)(2) v in = 2.7v, v en = 0v 1 a v ih(en)(1) v in = 5v 3.5 v v ih(en)(2) v in = 2.7v 1.9 v v il(en)(1) v in = 5v 1.5 v enable pin threshold voltage v il(en)(2) v in = 2.7v 0.8 v i ih(en)(1) v in = 5v, v en = 5v 6 20 a enable pin input current i ih(en)(2) v in = 2.7v, v en = 2.7v 3 10 a v fb(1) v in = 5v, v en = 5v 0.776 0.8 0.824 v feedback pin voltage v fb(2) v in = 2.7v, v en = 2.7v 0.776 0.8 0.824 v i fb(1) v in = 5v, v en = 5v -1 1 a feedback pin current i fb(1) v in = 2.7v, v en = 2.7v -1 1 a line regulation line reg v in = v en = 2.7v 5.5v v out =2.0v i out = 10ma 3.2 10 mv/v load regulation load reg v in =5v, v out =2.0v i out = 10ma 500ma 9 40 mv/a r ds(on)(h)(1) v in = 5v, v en = 5v, i lx = 0.5a 0.27 ? high-side on-state resistance r ds(on)(h)(2) v in = 2.7v, v en = 2.7v i lx = 0.5a 0.36 ? r ds(on)(l)(1) v in = 5v, v en = 5v i lx = 0.5a 0.27 ? low-side on-state resistance r ds(on)(l)(2) v in = 2.7v, v en = 2.7v i lx = 0.5a 0.3 ? high-side leakage current i leak(h) v in = 5v, v en = 0v, v lx = 0v -1 a low-side leakage current i leak(l) v in = 5v, v en = 0v, v lx = 5v 1 a f osc(1) v in = 5v, v en = 5v 0.85 1 1.15 mhz oscillation frequency f osc(2) v in = 2.7v, v en = 2.7v 0.85 1 1.15 mhz tss(1) v in =5v , v en =5v, (no load) 1 2 ms soft start time tss(2) v in =2.7v , v en =2.7v, (no load) 1.3 2.4 ms detection v uv 2.2 2.5 2.7 v undervoltage protection hysteresis v uv 0.1 v
TB7102F 2007-06-20 6 electrical characteristics common to all products when a pulse test is carried out, tj = 25c is the standard condition in the measurements for each item. any drift in the electrical characteristic due to a rise in the junction temperature of the chip may be disregarded. protection function (reference data) detection t sd 160 o c overheat protection hysteresis t sd 20 o c application circuit example figure 1: TB7102F application circuit example component constants the following values are given only for your referenc e and may need tuning depending on your input/output conditions and board layout. c in : input smoothing capacitance of 10 f (multilayer ceramic capacitor jmk212bj106kg, manufactured by taiyo yuden co., ltd.) c out : output smoothing capacitance of 10 f (multilayer ceramic capacitor jmk212bj106kg manufactured by taiyo yuden co., ltd.) r fb1 : output voltage setting resistance of 75 k (@ v in = 5 v, v out = 3.3 v) r fb2 : output voltage setting resistance of 24 k (@ v in = 5 v, v out = 3.3 v) l: inductor3.3 h (@ v in = 5 v, v out = 3.3 v); cdrh4d28c/ld series, manufactured by sumida corporation how to use setting the inductance the required inductance can be calculat ed by using the following equation: in out l osc out in v v if vv l ? ? ? = ? (1) v in : input voltage (v) f osc : oscillation frequency (hz) v out : output voltage (v) i l : inductor ripple current (a) * generally, i l should be set to 30% to 40% of the ma ximum output current . for the TB7102F, set i l to 0.3 a, as its maximum current [i lx(max) ] is 1 a (min). therefore select an inductor whose current rating is no lower than the peak switch current [1.15 a (min)] of the TB7102F. if t he current rating is exceeded, the inductor becomes saturated, leading to an unstable dc-dc converter operation. if v in = 5 v and v out = 3.3 v, the required inductanc e can be calculated as below. be sure to select an inductor TB7102F r fb1 r fb2 c out c in v fb pgnd sgnd en v in v out gnd gnd l lx v in
TB7102F 2007-06-20 7 with an optimum constant by taking v in variations into consideration. h v v ma mhz vv v v if vv l in out l osc out in 7.3 5 3.3 3001 3.35 = ? ? ? = ? ? ? = figure 2: inductor current waveform setting the output voltage for the TB7102F, the output voltage is set using the voltage dividing resistors r fb1 and r fb2 according to the reference voltage [0.8 v (typ.)] of the error amplifier conn ected to the fb pin. the output voltage can be calculated by using equation 2 below. if the r fb1 value is extremely large, a delay can occur due to parasitic capacitance at the fb pin. keep the r fb1 value at approximately 10 k . output voltage that can be set is from 0. 8 v (typ.) to input voltage -1v. it is recommended that a resistor with a precision of 1% or higher be used for setting the output voltage. ) 2fb r 1fb r 1(8.0 ) 2fb r 1fb r 1( ref v out v += +?= figure 3: output voltage setting resistors output capacitor the capacitance of the output ceramic capacitor is great ly affected by temperature. select a product whose temperature characteristics (such as b- characteristic) are excellent. the capacity value should be adjusted to about 10 f(@output voltage 2.0v~4.5v), or about 22 f(@output voltage 1.2v~2.0v),and th e capacitance set to an optimum value that meets the set's ripple requireme nt. ceramic capacitors can be used to achieve low output ripple. it is more difficult to achieve phase compensation with ceramic capaci tors because the equivalent series resistance (esr) of the former is lower. for this reason, perform a ca reful evaluation when using ceramic capacitors. precautions ? please select parts after confirming the actual operation in the customer set and considering the input voltage the output voltage, the output current, the temperature, the characteristics or the kind of capacitor, the inductor and resistance . ? if the voltage between the input and output is low, the in fluence of the on-state voltage of the switch power mosfet is greater, causing the volt age across the inductor to decrease. for this reason, it may become impossible for the required inductor current to flow, re sulting in lower performance or unstable operation of the dc-dc converter. as a rough standard, keep the input-output voltage potential difference at or above 1 v, taking the on-state voltage of the power mosfet into consideration. ? the lowest output voltage that can be set is 0.8 v (typ.). ? there is an antistatic diode between the enb and v in pins. the voltage between the enb and v in pins should satisfy the rating v enb - v in < 0.3 v ? if the operation becomes unstable due to the switching noise under a heavy load, please mount a by-pass capacitor c cc between the sgnd pin and the vin pin. output voltage r fb1 r fb2 1.2v 1.2k 2.4k 1.5v 2.1k ? 2.4k 1.8v 3.0k ? 2.4k 2.5v 5.1k 2.4k 3.3v 7.5k 2.4k lx v out r fb1 fb r fb2 osc f 1 t = in out on v v tt ?= ? (2) table1 :example of output voltage setting
TB7102F 2007-06-20 8 characteristic data en pin input current i ih ( a) input voltage v in (v ) 0 2 4 8 10 20 0 6 v in = v en ta = 25c i ih ? v in operating current i in ( a) input voltage v in (v ) 0 2 4 6 200 400 600 800 0 v in = v en = v fb t a = 25 o c i in ? v in en pin threshold voltage v ih, v il (v) ambient temperature t a (c ) -80 -40 0 40 80 120 160 2 2.5 3.5 1.5 3 v in = 5v v out = 3.3v v ih ,v il ? t a v ih v il en pin threshold voltage v ih, v il (v) ambient temperature t a (c ) -80 -40 0 40 80 120 160 1 2 3 0 v in = 2.7v v out = 1.5v v ih ,v il ? t a v ih v il operating current i in ( a) ambient temperature t a (c ) -80 -40 0 40 80 120 160 300 v in = 2.7v v en = 2.7v v in = v fb i in ? t a 500 600 700 800 400 ambient temperature t a (c ) operating current i in ( a) -80 -40 0 40 80 120 160 v in = 5.5v v en = 5.5v v in = v fb i in ? t a 400 500 600 700 800 900
TB7102F 2007-06-20 9 en pin input current i ih ( a) ambient temperature t a (c ) -80 -40 0 40 80 120 160 4 8 12 20 0 16 v in = 5v v en = 5v v out = 3.3v i ih ? t a undervoltage detection v uv (v) ambient temperature t a (c ) -80 -40 0 40 80 120 160 2.45 2.5 2.6 2.4 2.55 return detection v uv ? t a feedback pin voltage v fb (v) input voltage v in (v ) 2 3 4 5 6 0.8 0.85 0.75 v in = v en v out = 1.5v ta = 25c v fb ? v in 4 0 4 2 output voltage v out (v) v in = v en v out = 3.3v ta = 25c 2 3 2.5 3.5 v out ? v in 4 input voltage v in (v ) feedback pin voltage v fb (v) ambient temperature t a (c ) -80 -40 0 40 80 160 0.85 0.75 v in = 2.7v v en = 2.7v v out = 1.5v v fb ? t a 0.8 100 feedback pin voltage v fb (v) ambient temperature t a (c ) -80 -40 0 40 80 120 v in = 5v v en = 5v v out = 3.3v v fb ? t a 0.8 0.85 0.75 140
TB7102F 2007-06-20 10 oscillation frequency f osc (khz) ambient temperature t a (c ) -80 -40 0 40 80 120 160 v in = 5v v en = 5v v out = 3.3v f osc ? t a 1100 1200 800 900 1000 oscillation frequency f osc (khz) input voltage v in (v ) 2 3 4 5 6 1100 1200 800 f osc ? v in v in = v en v out = 1.5v ta = 25c 900 1000 output voltage v out (v) 0.01 0.1 1 1.26 1.14 v in = 5.0v v out ? i out v out = 1.2v l = 3.3 h c out = 22 f ta = 25c 1.24 1.22 1.18 1.16 1.2 load current i out (a) output voltage v out (v) 0.01 0.1 1 1.26 1.14 v in =3.3 v v out ? i out v out = 1.2v l = 3.3 h c out = 22 f ta = 2 5 c 1.24 1.22 1.18 1.16 load current i out (a) load current i out (a) output volatage v out (v) 0.01 0.1 1 v in =5.0 v v out = 3.3v l = 3.3 h c out = 10 f ta = 25c 3.3 3.465 3.135 3.410 3.355 3.245 3.190 v out ? i out output voltage v out (v) input voltage v in (v) 2 4 6 1.2 1.26 1.14 i out = 0.2a v out = 1.2v l = 3.3 h c out = 22 f ta =2 5 c 1.24 1.22 1.18 1.16 3 5 v out ? v in
TB7102F 2007-06-20 11 load current i out (a) ? i out efficiency (%) v out = 1.2v l = 3.3 h c out = 22 f ta = 25c v in = 3.3v 0 80 20 100 60 40 0 0.2 1 0.4 0.6 0.8 load current i out (a) ? i out efficiency (%) v out = 1.2v l = 3.3 h c out = 22 f ta = 25c v in = 5.0v 0 80 20 100 60 40 0 0.2 1 0.4 0.6 0.8 input voltage v in (v) output voltage v out (v) v out ? v in v out = 3.3v l = 3.3 h c out = 10 f ta = 25c 3.3 3.465 3.135 3.410 3.355 3.245 3.190 2 4 6 3 5 i out = 0.2a ? i out efficiency (%) v out = 3.3v l = 3.3 h c out = 10 f ta = 25c v in = 5.0v 0 80 20 100 60 40 0 0.2 1 0.4 0.6 0.8 load current i out (a)
TB7102F 2007-06-20 12 package dimensions son8-p-0303-0.65a unit: mm weight: 0.017 g (typ.) 14 5 8 0.33 0.05 0.475 0.65 0.1 max 2.9 0.1 a 2.4 0.1 2.8 0.1 b 0.8 0.05 s 0.17 0.02 0.025 s 0.28 +0.1 - 0.11 0.28 +0.1 - 0.11 1.12 +0.13 - 0.12 1.12 +0.13 - 0.12 0.05 b m 0.05 a m
TB7102F 2007-06-20 13 restrictions on product use 20070701-en ? the information contained herein is subject to change without notice. ? toshiba is continually working to improve the quality and reliability of its products. nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity an d vulnerability to physical stress. it is the responsibility of the buyer, when utilizing toshiba produc ts, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such toshiba products could cause loss of human life, bodily injury or damage to property. in developing your designs, please ensure that toshiba products are used within specified operating ranges as set forth in the most recent toshib a products specifications. also, please keep in mind the precautions and conditions set forth in the ?handling guide for semiconduct or devices,? or ?toshiba semiconductor reliability handbook? etc. ? the toshiba products listed in this document are in tended for usage in general electronics applications (computer, personal equipment, office equipment, measuri ng equipment, industrial robotics, domestic appliances, etc.).these toshiba products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfuncti on or failure of which may cause loss of human life or bodily injury (?unintended usage?). unintended usage incl ude atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, et c.. unintended usage of toshiba products listed in his document shall be made at the customer?s own risk. ? the products described in this document shall not be used or embedded to any downstream products of which manufacture, use and/or sale are prohibited under any applicable laws and regulations. ? please contact your sales representative for product- by-product details in this document regarding rohs compatibility. please use these products in this document in compliance with all applicable laws and regulations that regulate the inclusion or use of controlled substances. toshiba assumes no liability for damage or losses occurring as a result of noncompliance with applicable laws and regulations.

▲Up To Search▲

Price & Availability of TB7102F

	To Download TB7102F Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .