orderin g numbe r : ena1768 bi-cmos ic step-down switching regulato r LV5762LF overview LV5762LF is a 1ch step-down voltage switching regulator. functions ? 1ch step-down switching regulator controller ? f requency fold back function ? l oad-independent soft start circuit ? on/off function ? built-in pulse-by-pulse ocp circuit. it is detect ed b y using on resistance of an external mos. specifications maximum ratings at ta = 25 c parameter symbol conditions ratings unit supply voltage v in max 45 v allowable power dissipation pd max *) 0.65 w operating temperature topr -40 to 85 c storage temperature tstg -55 to 150 c * s pecified board: 24.0mm 15.0mm ? 1.6mm, glass epoxy board (2-layer). recommended operating conditions at ta = 25 c parameter symbol conditions ratings unit supply voltage range 1 v in 8 to 42 v error amplifier input coltage v fb 0 to 1.6 v electrical characteristics at ta = 25 c, v in = 12v ratings parameter symbol conditions min typ max unit reference voltage block internal reference voltage vref including offset of e/a 0.695 0.705 0.715 v 5v power supply v dd i out =0 to 5ma 4.7 5.2 5.7 v continued on next page. specifications of any and all sanyo semiconductor co.,l td. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer ' s products or equipment. to verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer ' sproductsor equipment. any and all sanyo semiconductor co.,ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, av equipment, communication device, office equipment, industrial equ ipment etc.). the products mentioned herein shall not be intended for use for any "special application" (medica l equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, t ransportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of re liability and can directly threaten human lives in case of failure or malfunction of the product or may cause har m to human bodies, nor shall they grant any guarantee thereof. if you should intend to use our products for app lications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. if there is n o consultation or inquiry before the intended use, our customer shall be solely responsible for the use. 60910 sy 20100524-s00001 no.a1768-1/5
LV5762LF no.a1768-2/5 continued from preceding page. ratings parameter symbol conditions min typ max unit triangular waveform oscillator block oscillation frequency f osc 870 1000 1130 khz frequency variation f osc _dv v in =8 to 42v 1 % oscillatory frequency fold back detection voltage v osc _fb detect in voltage after the end of ss 0.5 v oscillatory frequency after fold back f osc _fb 100 150 200 khz on/off circuit block ic start-up voltage v en _on v in =8 to 42v 3.4 4.3 v ic off voltage v en _of f v in =8 to 42v 1.1 1.3 v soft start circuit block soft start source current i ss _sc en ? 5v, ss=0v 3.4 4.3 5.2 a soft start sink current i ss _sk en ? 1v, v dd =5v , ss=1v 2 ma voltage to end the soft start function v ss _end 0.7 0.9 1.1 v uvlo circuit block uvlo lock release voltage v uvlo 7.0 7.4 7.8 v uvlo hysteresis v uvlo _h 0.6 v error amplifier input bias current i ea _i n 100 a error amplifier transconductance gea 1000 1400 1800 a/v common mode input voltage range v ea _r v in =8 to 42v 0.0 1.6 v sink output current i ea _o sk fb=1.0v -100 a source output current i ea _o sc fb=0v 100 a current detection amplifier gain gisns 1.3 over current limiter circuit block reference current i lim -10% 20 +10% a over current detection comparator offset voltage v lim _ofs -5 +5 mv over current detection comparator common mode input range v in -0.45 v in v pwm comparator vtmax duty cycle=dmax 0.95 1.1 1.25 v input threshold voltage vt0 duty cycle=0% 0.35 0.45 0.55 v maximum on duty dmax 75 80 % output block output stage on resistance(the upper side) r on h 5 output stage on resistance(the under side) r on l 5 output stage on current(the upper side) i on h 240 ma output stage on current(the under side) i on l 240 ma the whole device standby current i cc s en ? 1v 60 a mean consumption current i cc a en ? 5v 3.6 ma
LV5762LF pin assignment 1 2 3 4 8 7 6 5 comp v in gnd fb sw cboot top view en 9 10 11 12 13 14 15 16 LV5762LF v dd nc nc ss/ hiccup hdrv nc nc ldrv pin function pin no. pin name function 1 comp error amplifier output pin. connect a phase compensation circuit between this pin and gnd. 2 en on/off pin. 3 sw pin to connect with switching node. the sour ce o f nch mosfet connects to this pin. 4 cboot bootstrap capacity connection pin. this pin becomes a gate drive power supply of an external nch mosfet. connect a bypath capacitor between cboot and sw. 5 hdrv an external the upper mosfet gate drive pin. 6, 7 14, 15 nc no connection 8 ldrv an external the lower mosfet gate drive pin. 9 v dd power supply pin for an external the mos-fet gate drive. 10 gnd ground pin. each reference voltage is based on the voltage of the ground pin. 11 v in power supply pin. this pin is monitored by uvlo function. when the voltage of this pin becomes 7.8v or more by uvlo function, the ic starts and the soft start function operates. 12 i lim reference current pin for current detection. the sink current of about 20 a flows to this pin. when a resistance is connected between this pin and v in outside and the voltage applied to the sw pin is lower than the voltage of the terminal side of the resistance, the upper nch mosfet is off by operating the current limiter comparator. this operation is reset with respect to each pwn pulse. 13 ss/hiccup pin to connect a capacitor for soft start. a capacitor for soft start is charged by using the voltage of about 4.3 a. this pin ends the soft start period by using the voltage of about 0.9v and the frequency fo ld back function becomes active. 16 fb error amplifier reverse input pin. by operating the converter, the voltage of this pin becomes 0.7v. the voltage in which the output voltage is divided by an ex ternal resistance is applied to this pin. also, the oscillation frequency become one-eighth when the volt age o f this pin becomes 0.4v or less after soft start function. no.a1768-3/5
LV5762LF package dimensions unit : mm (typ) 3394 no.a1768-4/5 sanyo : vqfn16(3.0x3.0) 3.0 3.0 0.85 max 0.0 nom (0.8) top view side view side view bottom view exposed die-pad do not connect (1.5) (1.5) 0.4 1 12 2 16 (0.75) 0.5 0.25 -40 0 20 40 60 80 100 0 1.0 0.2 pd max -- ta ambient temperature, ta -- c allowable power dissipation, pd max -- w 0.34 mounted on a specified board: 24.0 15.0 1.6mm 3 2 laery glass epoxy board (2-layer) 0.4 0.6 0.8 -20 0.65 block diagram fb comp + saw wave oscillator 5v regulator reference voltage + + - + - + - ocp comp v in current amp + - d-max=90% 1.1v 0.45v uvlo control logic shutdown(sd) sw en v in tsd i lim 0.7v s r q s r q sd + - + - hiccup comp + - ss comp 1.3v ocp 0.9v sd 0.5v fosc forced 1/8 hiccup comp cboot hdrv v dd ldrv gnd ss/ hiccup
LV5762LF sample application circuit en ss/hiccup comp v in i lim cboot hdrv sw ldrv fb v dd gnd LV5762LF c7 r5 c6 c1 c2 q1 q2 r4 c4 c9 c10 out gnd l r3 d2 d1 c8 c31 c3 c5 r2 r1 on/off v in =8v to 42v sanyo semiconductor co.,ltd. assumes no responsib ility for equipment failures that result from using products at values that exceed, even momentarily, rate d values (such as maximum ra tings, operating condition ranges, or other parameters) listed in products specif ications of any and all sanyo semiconductor co.,ltd. products described or contained herein. sanyo semiconductor co.,ltd. strives to supply high-qual ity high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. it is possible that these probabilistic failures or malfunction could give rise to acci dents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause dam age to other property. when designing equipment, adopt safety measures so that these kinds of accidents or e vents cannot occur. such measures include but are not limited to protective circuits and error prevention c ircuits for safe design, redundant design, and structural design. upon using the technical information or products descri bed herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of sanyo semiconductor co.,ltd. or any third party. sanyo semiconductor co.,ltd. shall not be liable f or any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. information (including circuit diagr ams and circuit parameters) herein is for example only; it is not guaranteed for volume production. any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. when designing equi pment, refer to the "delivery specification" for the sanyo semiconductor co.,ltd. product that you intend to use. in the event that any or all sanyo semiconductor c o.,ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities conc erned in accordance with the above law. no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any in formation storage or retrieval system, or otherwise, without the prior written consent of sanyo semiconductor co.,ltd. this catalog provides information as of june, 2010. specifications and information herein are subject to change without notice. ps no.a1768-5/5
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