specifications of any and all sanyo semiconductor co.,ltd. 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 ' s products or 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. the products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appli ances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliab ility and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. if you should intend to use our products for new introduction or other application different from current conditions on the usage of automotive device, communication device, office equipment, industrial equipment etc. , please consult with us about usage condition (temperature, operation time etc.) prior to the intended use. if there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. o0312 20120928-s00001 no.a2134-1/6 LV5747QA overview the LV5747QA is a 1-channel step-down switching regulator. functions ? 1 channel step-down switching regulator controller. ? frequency decrease function at pendent. ? load-independent soft start circuit. ? on/off function. ? built-in pulse-by-pulse ocp circuit. it is detect ed by 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 allowable pin voltage 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 ss, fb, comp v dd +0.3 v allowable power dissipation pd max mounted on a specified board. * 0.65 w junction temperature tj max 150 c operating temperature topr -40 to +85 c storage temperature tstg -55 to +150 c * specified board: 24mm 15mm 1.6mm, glass epoxy 2-layer board. bi-cmos lsi 1-channel step-down switching regulator orderin g numbe r : ena2134
LV5747QA no.a2134-2/6 recommended operating ranges 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 parameter symbol conditions ratings unit min typ max 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 335 385 435 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 oscillatory frequency after fold back f osc fb v fb = 0v 25 45 60 khz on/off circuit block ic start-up voltage v en on v in = 8 to 42v 3.4 4.3 v start-up voltage hysteresis v en hys 1.0 1.2 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 input threshold voltage vt max duty cycle = dmax, sw = v in 1.0 1.1 1.2 v vt0 duty cycle = 0%, sw = v in 0.4 0.5 0.6 v maximum on duty dmax 85 90 95 % 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
LV5747QA no.a2134-3/6 package dimensions unit : mm (typ) 3444 sanyo : vqfn16j(3.0x3.0) 3.0 0.25 3.0 0.8 max top view side view side view bottom view (1.7) (1.7) 0.4 1 12 2 16 (0.75) 0.5 0.035 0 0.8 0.2 0.4 0.6 0.65 0.34 1.0 -- 40 0 -- 20 60 80 40 20 100 pd max -- ta ambient temperature, ta -- c allowable power dissipation, pd max -- w specified board: 24151.6mm 3 glass epoxy 2-layer board.
LV5747QA no.a2134-4/6 pin assignment 16 15 14 13 5 6 7 8 4 3 2 (17) subgnd 1 cboot sw en comp ldrv nc nc hdrv ss nc nc fb v dd gnd v in ilim 9 10 11 12 (top view) pin function pin no. pin name description 1 comp error amplifier output pin. connect a p hase compensation circuit between this pin and fb. 2 en on/off pin. 3 sw pin to connect with switching node. the s ource of nchmosfet connects to this pin. 4 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. 5 hdrv an external the upper mosfet gate drive pin. 6, 7, 14, 15 nc nc denotes no internal connection. 8 ldrv an external the lower mosfet gate drive pin. 9 v dd power supply pin for an external the lower 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 ilim 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 nchm osfet is off by operating the current limiter comparator. this operation is reset with respect to each pwm pulse. 13 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 and the frequency fold back function becomes active. 16 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 resistance 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. 17 subgnd it is connected to sub of the ic. thus, use it with electric potential same as a gnd pin.
LV5747QA no.a2134-5/6 block diagram en 2 11 5v regulator v in + - ocp comp reference voltage + - v in current amp s r q saw wave oscillator 12 5 a s r q + - sd 1.1v + - + sd 0.7v 13 16 1 + - 0.5v ss fb comp ilim ffold amp error amp fosc forced 1/8 dmax = 90% 1.1v 0.5v + - control logic uvlo 5 8 9 10 3 4 cboot hdrv sw v dd ldrv gnd 17 subgnd shut down(sd) 5v pwm comp 20 a tsd sample application circuit c10 c4 q1 q2 l en ss comp cboot c1 c9 c7 c2 c8 c5 c3 on/off v in = 8 to 42v out c6 r5 r3 r2 r4 hdrv sw ldrv fb v dd gnd v in ilim gnd 16 1 2 3 4 5 8 9 10 subgnd 17 11 12 13 d1 c11 r1 d2
LV5747QA ps no.a2134-6/6 sanyo semiconductor co.,ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specif ications of any and all sanyo semiconductor co.,ltd. products described or contained herein. regarding monolithic semiconductors, if you should intend to use this ic continuously under high temperature, high current, high voltage, or drastic temperature change, even if it is used within the range of absolute maximum ratings or operating conditions, there is a possibility of decrease reliability. please contact us for a confirmation. sanyo semiconductor co.,ltd. strives to supply high-quality 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 accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause damage to other property. when designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. in the event that any or all sanyo semiconductor co.,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 concerned 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 information storage or retrieval system, or otherwise, without the prior written consent of sanyo semiconductor co.,ltd. any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. when designing equ ipment, refer to the "delivery specification" for the sanyo semiconductor co.,ltd. product that you intend to use. upon using the technical information or products described 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 for any claim or suits with regard to a third party's intellectual property rights which has resulted from the use of the technical information and products mentioned above. this catalog provides information as of october, 2012. specifications and information herein are subject to change without notice.
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