orderin g numbe r : ena1759a bi-cmos lsi 1-channel step-down switching regulator LV5747NTT overview the LV5747NTT is a 1-channel step-down switching regulator. functions ? 1 channel step-down switching regulator controller. ? f requency decrease function at pendent. ? l oad-independent soft start circuit. ? on/off function. ? bu ilt-in pulse-by-pulse ocp circuit. it is detect ed b y using on resistance of an external mos. specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit supply voltage v in max 45 v v in , sw 45 v hdrv, cboot 52 v ldrv 6.0 v between cboot to sw between cboot to hdrv 6.0 v en, ilim v in +0.3 v between v in to ilim 1.0 v v dd 6.0 v allowable pin voltage ss, fb, comp v dd +0.3 v allowable power dissipation pd max mounted on a specified board. * 0.75 w operating temperature topr -40 to +85 c storage temperature tstg -55 to +150 c * specified board : 35mm 32mm 1.6mm, glass epoxy 2-layer board. 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/60210 sy pc 20100517-s00001 no.a1759-1/5
LV5747NTT no.a1759-2/5 recommended operating range at ta = 25 c parameter symbol conditions ratings unit supply voltage range v in 8.0 to 42 v error amplifier input voltage v fb 0 to 1.6 v electrical characteristics at ta = 25 c, v in = 24v ratings parameter symbol conditions min typ max unit reference voltage block internal reference voltage vref incl uding offset of e/a 0.698 0.708 0.718 v 5v power supply v dd i out = 0 to 5ma 4.7 5.2 5.7 v triangular waveform oscillator block oscillation frequency f osc 260 300 340 khz frequency variation f osc dv v in = 8 to 42v 1 % oscillation frequency fold back detection voltage v osc fb fb voltage detection after ss ends 0.5 v oscillation frequency after fold back f osc fb v fb = 0v 25 45 60 khz on/off circuit block ic start-up en voltage v en on v in = 8 to 42v 3.4 4.3 v ic off en voltage v en of f 1.1 1.3 v soft start circuit block soft start source current i ss sc en > 4. 3v 4 5 6 a soft start sink current i ss sk en < 1v , v dd = 5v 2 ma soft start end voltage v ss end 0.9 1.1 1.3 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 in 100 na error amplifier gain g ea 1000 1400 1800 a/v common mode input range v ea r v in = 8 to 42v 0.0 1.6 v sink output current i ea osk fb = 1.0v -100 a source output current i ea osc 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 vt max duty cycle = dmax, sw = v in 1.0 1.1 1.2 v input threshold voltage vt0 duty cycle = 0%, sw = v in 0.4 0.5 0.6 v maximum on duty dmax 92 % output block output stage on resistance (the upper side) r onh 5 output stage on resistance (the under side) r onl 5 output stage on current (the upper side) i onh 240 ma output stage on current (the under side) i onl 240 ma the whole device standby current i ccs en < 1v 60 a mean consumption current i cca en > 4 .3v 3.3 ma
LV5747NTT package dimensions unit : mm (typ) 3375 pd max -- ta 0 0.36 0.2 0.4 0.6 0.8 0.75 1.0 --40 --20 40 60 20 8085 0 100 ambient temperature, ta -- c allowable power dissipation, pd max -- w specified board : 35 32 1.6mm 3 glass epoxy 2-layer board. sanyo : msop12(150mil) 3.0 1.1 max 3.0 0.5 4.9 12 12 0.2 0.5 (0.25) (0.85) 0.125 0.08 pin assignment 1 2 3 4 5 6 7 8 12 11 10 9 fb comp en sw cboot hdrv ss ilim v in gnd v dd ldrv LV5747NTT top view no.a1759-3/5
LV5747NTT block diagram 10v in v in 11 ilim 12ss 1fb comp 9 gnd 7 ldrv 8v dd + - + - + - + - 0.7v sd + + - 1.1v sd + - 0.5v ocp comp current amp err amp ffold amp dmax = 90% pwm comp shut down(sd) 1.1v 0.5v 5v 20a 5a 5v regulator reference voltage saw wave oscillator fosc forcec 1/8 s r q control logic uvlo tsd s r q en 3 4sw 6 hdrv 5 cboot 2 pin function pin no. pin name description 1 fb error amplifier reverse input pin. by operating t he converter, the voltage of this pin becomes 0.708v. the voltage in which the output voltage is divided by an external re sistance is applied to this pin. moreover, when this pin voltage becomes 0.5v or less after a soft start ends, the frequency fold back function operations, and the oscillating frequenc y is falling with the fb voltage. 2 comp error amplifier output pin. connect a p hase compensation circuit between this pin and fb. 3 en on/off pin. 4 sw pin to connect with switching node. the source of nchmosfet connects to this pin. 5 cboot bootstrap capacity connection pin. this pin become s a gate drive power supply of an external nchmosfet. connect a bypath capacitor between cboot and sw. 6 hdrv an external the upper mosfet gate drive pin. 7 ldrv an external the lower mosfet gate drive pin. 8 v dd power supply pin for an external the lower mos-fet gate drive. 9 gnd ground pin. each reference voltage is based on the voltage of the ground pin. 10 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. 11 ilim reference current pin for current de tection. 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 nchm osfet is off by operating the current limiter comparator. this operation is reset with respect to each pwm pulse. 12 ss pin to connect a capacitor for soft start. a capacitor for soft start is charged by using the voltage of about 5 a. this pin ends the soft start period by using the voltage of about 1.1v a nd the frequency fold back function becomes active. no.a1759-4/5
LV5747NTT sample application circuit c10 c4 c11 q1 q2 d1 d2 l en ss comp cboot c1 c9 c7 c2 c8 c5 c3 on/off v in = 8.0 to 42v out c6 r5 r3 r1 r2 r4 hdrv sw ldrv fb v dd gnd v in ilim gnd 1 2 3 4 5 6 7 8 9 10 11 12 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.a1759-5/5
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