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. 82510 sy 20100312-s00001 no.a1684-1/6 LV5749NV application the LV5749NV is a 1-channel step-down switching regulator. functions ? 1 channel step-down switching regulator controller. ? 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. ? synchronous rectification. ? current mode control. ? synchronous drive by external signal. specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit supply voltage v in max 45 v allowable power dissipation pd max mounted on a specified board. * 0.74 w operating temperature topr -40 to +85 c storage temperature tstg -55 to +150 c * : when mounted on the specified printed circuit board (114.3mm 76.1mm 1.6mm), glass epoxy recommended operating range at ta = 25 c parameter symbol conditions ratings unit supply voltage range v in 8.5 to 42 v error amplifier input voltage 0 to 1.6 v bi-cmos lsi 1-channel step-down switching regulator orderin g numbe r : ena1684 www.datasheet.co.kr datasheet pdf - http://www..net/
LV5749NV no.a1684-2/6 electrical characteristics at ta = 25 c, v in = 12v ratings parameter symbol conditions min typ max unit reference voltage block internal reference voltage vref incl uding offset of e/a 0.654 0.67 0.686 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 rt = 220k 110 125 140 khz frequency variation f osc dv v in = 8.5 to 42v 1 % on/off circuit block ic start-up voltage v en on 2.5 3.0 3.5 v ic off voltage v en off 1.1 1.3 1.5 v soft start circuit block soft start source current i ss sc en > 3.5v 4 5 6 a soft start sink current i ss sk en < 1v, v dd =5v 2 ma uvlo circuit block uvlo lock release voltage v uvlo 7.5 8.0 8.5 v uvlo hysteresis v uvlo h 0.7 v ocp circuit block ocp charge current i ocp 5 a error amplifier input bias current i ea in 100 na error amplifier transconductance g ea 1000 1400 1800 a/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 1.5 over current limi ter circuit block reference current 1 i lim 1 mode = l (gnd) -10% 18.5 +10% a reference current 2 i lim 2 mode = h (v in ) -10% 37.0 +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 0.9 1.0 1.1 v input threshold voltage (fosc = 125khz) vt0 duty cycle = 0% 0.4 0.5 0.6 v maximum on duty dmax 80 85 90 % 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 10 a mean consumption current i cca en > 3.5v 3 ma www.datasheet.co.kr datasheet pdf - http://www..net/
LV5749NV no.a1684-3/6 package dimensions unit : mm (typ) 3178b pin assignment sanyo : ssop16(225mil) 5.2 4.4 6.4 0.22 0.65 (0.33) 18 9 16 0.5 0.15 1.5max 0.1 (1.3) 1fb top view comp 2 en 3 rt 4 sync 5 sw 6 cboot 7 hdrv 8 ss 16 ilim 15 v in 14 ocp 13 mode 12 gnd 11 v dd 10 ldrv 9 LV5749NV 0 0.7 0.2 1.0 -40 80 0.38 60 20 40 0 100 0.8 -20 0.4 0.6 ambient temperature, ta -- c pd max -- ta allowable power dissipation, pd max -- w specified circuit board : 114.3 76.1 1.6mm 3 glass epoxy board www.datasheet.co.kr datasheet pdf - http://www..net/
LV5749NV no.a1684-4/6 block diagram pin function pin no. pin name description 14 v in power supply pin. this pin is monitored by uvlo function. when the voltage of this pin becomes 7.7v or more by uvlo function, the ic starts and the soft start function operates. 11 gnd ground pin. each reference voltage is based on the voltage of the ground pin. 10 v dd power supply pin for an external the lower mos-fet gate drive. 7 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 sw pin to connect with switching node. the source of nchmosfet connects to this pin. 5 sync external synchronous signal input pin. 9 ldrv an external the lower mosfet gate drive pin. 8 hdrv an external the upper mosfet gate drive pin. 1 fb error amplifier reverse input pin. by operating the converter, the voltage of this pin becomes 0.67v. the voltage in which the output voltage is divided by an external resistance is applied to this pin. 2 comp error amplifier output pin. connect a phase compensation circuit between this pin and gnd. 16 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 fo ld back function becomes active. 15 ilim reference current pi n for current detection. the sink current of about 20 a flows to this pin when low level (gnd) is set to the mode pin. also, the sink current of about 40 a flows to this pin when high level (v in ) is set to the mode 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 nchmosfet is off by operating the current limiter comparator. this operation is reset with respect to each pwm pulse. 3 en on/off pin. 13 ocp pin to set the time of the timer (d uring double the over current detection point) connect a capacitor between this pin and gnd. ocp charge current : 5 a 4 rt pin to set the oscillation frequency. c onnect a resistance between this pin and gnd. 12 mode pin to switch the over current detection point. set by the low level (gnd) of the ilim pin. set by the high level (v in ) of the ocp pin. when this mode pin is set to the high level and the point of th e over current detection is set by using the ilim pin is exceede d, the value becomes double the original value. also, when the mode pin is set to the low level, the point of the over current detection remains an original value. 14v in v cc 12mode 15ilim 16ss 1fb comp 11 gnd 9 ldrv 10 v dd + - + - + - + - 0.67v sd + + - 13ocp 1.25v ocp comp1 ocp comp2 current amp err amp rt sync dmax = 90% pwm comp shut down(sd) 1.0v 0.5v 5v mode l 18.5 a mode h 37a 5a 5a 5v regulator reference voltage saw wave oscillator osp logic s r q control logic uvlo 5 4 en 3 6sw 8 hdrv 7 cboot 2 www.datasheet.co.kr datasheet pdf - http://www..net/
LV5749NV no.a1684-5/6 timing chart when the mode pin is set to the high level and the point of the over current detection is set by using the ilim pin is exceeded, the value becomes do uble the original value. also, when the mode pin is set to the low level, the point of over current detection remains an original value. timing chart of the over current detection point switching is as below. setting chart 1. output voltage setting ? setting of the output voltage vout is as follows. vout = 1 + r4 r3 v ref = 1 + r4 r3 0.67(typ) [v] 2. soft start setting ? setting of capacitor c5 is as follows. c5 = iss tss v ref = 5 tss 0.67 [f] iss : charge current value. tss : soft start time 3. ocp timer setting ? setting of ocp timer capacitor c11 is as follows. c11 = iocp tocp vocp comp1 = 5 tocp 1.3 [f] iocp : charge current value. tocp : ocp time 4. current limiter setting ? setting of the current limiter set resistance r5 is as follows. r5 = rdson iout iilim = rdson il max 18.5 [ ] iilim : ilim current value. il : inductance current value rdson : on resistance value between q1 drain-souces. t 1.25v current limit 2 a for example 6a current limit 1 a for example 3a over current detection point during high mode over current detection point during low mode load current 0v ocp www.datasheet.co.kr datasheet pdf - http://www..net/
LV5749NV ps no.a1684-6/6 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. sample application circuit this catalog provides information as of august, 2010. specifications and information herein are subject to change without notice. sync c10 open c12 open c4 open q1 mch6406 d1 dse010 q1 mch6406 mode en ss comp rt cboot sync h/l on/off v in = 8.5v to 12v vout = 5v c6 1000pf c11 680pf hdrv sw ldrv fb v dd gnd ocp v in ilim ss 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 www.datasheet.co.kr datasheet pdf - http://www..net/
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