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. o2010 sy 20101006-s00008 no.a1857-1/7 LV5876MX overview LV5876MX is a 1ch step-down switc hing regulator. with built-in 0.25 power mosfet switch, it achieves high output current and high efficiency. with low-h eat resistance, miniature package mfp8 ( 200mil) with heat-sink is adopted. since it is current mode control type, it has good load current re sponse, and phase compensation is easy. with on/off pin, operating can be less than 90 a at stand-by mode. it has cycle-by-cycle over current protection for load devices. with external capacitor, it achieves soft start. functions ? 2.0a 1ch step-down regulator ? small package: mfp8 (200mil) with heat sink ? high efficiency (88% i out = 1a, v in = 12v, v o = 5v) ? standby mode ? over-current protection ? thermal shutdown protection ? reference voltage: 0.8v ? inside frequency: 950khz ? soft start ? wide input dynamic range (4.75 to 18v) specifications maximum ratings at ta = 25 c parameter symbol conditions ratings unit maximum input v in voltage v in max 20 v boot pin maximum voltage v bt max 25 v sw pin maximum voltage v sw max v in max v boot pin-sw pin maximum voltage v bs-sw max 7v en maximum voltage v en max 20 v fb, comp, ss pin maximum voltage v fs max 7v allowable power dissipation pd max mount on a specified board *1 2.05 w junction temperature tj max 150 c operating temperature topr -20 to 80 c storage temperature tstg -40 to 150 c *1: 46.4mm 31.8mm 1.7mm four layers glass epoxy substrate. note: plan the maximum voltage while including coil and surge voltages, so that the maximum voltage is not exceeded even for an instant. bi-cmos ic step-down switching regulato r orderin g numbe r : ena1857
LV5876MX no.a1857-2/7 recommended operating conditions at ta = 25 c parameter symbol conditions ratings unit v in pin voltage v in 4.75 to 18 v boot pin voltage v bt -0.3 to 23 v sw pin voltage v sw -0.4 to v in v boot pin-sw pin voltage v bs-sw 6.5 v en voltage v en 18 v fb, comp, ss pin voltage v fso 6v electrical characteristics at ta = 25 c, v in = 12v ratings parameter symbol conditions min typ max unit ic current drain at standby i cc 1 en=0v 90 a ic current drain in operation i cc 2 en=5v, fb=1v 2.3 ma efficiency effcy v in =12v, i out =1a, vo=5v, design target *2 88 % reference voltage vref v in =4.75v to 28v -2% 0.8 +2% v fb pin bias current iref fb=0.8v 20 200 na high-side on resistance ronh boot=5v, i out =1a 0.25 low-side on resistance ronl 5 oscillation frequency f osc 760 950 1140 khz oscillatory frequency when short-circuit is protected f oscs 255 340 425 khz en high-threshold voltage v en h 0.9 1.8 2.7 v en low-threshold voltage v en l 0.7 1.35 2.0 v maximum on duty d max 80 % sw peak current limit 1 icl1 v in =12v, v out =1.2v, l=2.2 h 3.1 5.7 a sw peak current limit 2 icl2 v in =12v, v out =3.3v, l=2.2 h 2.8 5.4 a sw peak current limit 3 icl3 v in =12v, v out =5v, l=2.2 h 2.5 5.1 a thermal shutdown temperature ttsd *design guarantee *3 160 c thermal shutdown temperature hysteresis dtsd *design guarantee *3 40 c soft start current i ss ss=0v 3 5 7 a uvlo threshold voltage v uvlo v in rising 3.9 4.2 4.5 v uvlo hysteresis v hys 0.2 v *2: reference value (not tested ic unit) *3: design guarantee (value guaranteed by design and not tested ic unit) pin assignment 1 2 3 4 8 7 6 5 boot v in sw gnd ss en comp fb to p view
LV5876MX no.a1857-3/7 package dimensions unit : mm (typ) 3372 specified board [ic small signal part side] specified board [coil schottky part side] block diagram and sample application circuit sanyo : mfp8(200mil) 5.0 4.4 6.0 12 8 0.15 0.35 1.27 (0.65) 1.7 max (1.5) (2.6) (3.4) 0.05 0.43 top view side view side view bottom view -20 0 20 40 60 80 100 0 2.5 2.05 1.5 1.0 0.5 2.0 pd max -- ta ambient temperature, ta -- c allowable power dissipation, pd max -- w 1.15 fb comp osc 1mhz ss en uvlo + vref 0.8v tsd v in gnd high : on low or open : off 7 internal regulator error amp pwm comparator internal regulator 5 6 c3=560pf 8 + - slope comp + - + - output logic short-through protection pre- drive pre- drive sw boot v in 1 2 3 4 0.25 6 pin-short protection d1 v out =3.3v v in =12v l1:nr5040t 2r2n[taiyo yuden] d1:sbm30-03[sanyo] c2:grm31cb31e106ka75[murata] c5,c9:c2012jboj106m[tdk] c :ceramic capacitor
LV5876MX no.a1857-4/7 pin function pin no. pin name function equivalent circuit 1 boot upper mos transistor boot strap capacitance connection pin. connect the boot capacitance of about 0.022uf between sw pins. to protect the sw pin?s absolute maximum rating , to ensure stable operation, and to eliminate noise , the boot capacitance serial resistance (about 100 ? ) rb proves effective. 2 v in input voltage pin. connect substantially large (10uf more) capacitance between this pin and gnd. 3 sw power switch pin. connect the output lc filter. connect the above capacitance be tween this pin and boot pin. v in boot sw short protection circuit output mos 4 gnd ground pin. 5 fb feedback pin. set the output voltage by means of split resistor in the section of the output voltage vout-fb-gnd. vout setting is made as calculated below. v out = vref { 1 + (r1 + r10) r3 } vref = 0.8v example: 3.3v output voltage (see, block diagram and application example) v out = 0.8 { 1 + (27k + 4.3k) 10k } =3.304v 8 ss soft start pin. sets the soft start time by means of the built-in 5 a source voltage and external soft start c apacity. the soft start capacity c ss can be set as follows: c ss = 5 a tss vref where, tss is the soft start time and vref is the reference voltage. example:2.4ms soft start time achieved c ss = 5 a 2.4ms 0.8v = 0.015 f ss vref 0.8v v in fb internal regulation line 6 comp phase compensation pin. connects with the phas e compensation external capacitance and resistance of dc/dc converter close loop. comp v in short protection circuit internal reguretion line 7 en enable pin. converter enabled when set to the high voltage and disabled when gnd or open state. en v in
LV5876MX ps no.a1857-5/7 reference data (1) i cc 1 -- ta 70 75 90 95 100 105 80 85 2.3 2.2 2.1 110 --40 --20 0 40 80 40200 80 120 20 60 --20 0 40 80 20 60 --20 0 40 80 20 60 --20 0 40 80 20 60 --20 0 40 80 20 60 60 100 100 i cc 2 -- ta 2.0 2.5 --40 100 vref -- ta 780 785 790 795 800 805 810 815 10 15 5 20 25 30 35 40 45 820 --40 --20 140 iref -- ta 0 50 --40 100 f osc -- ta 880 900 920 940 960 980 1000 1020 1040 75 80 85 90 --40 d max -- ta --40 100 v in = 12v en = 0v v in = 12v v in = 12v v in = 12v v in = 12v en = 3v fb = 1v v in = 12v fb = 0.8v 2.4 100 ambient temperature, ta -- c ic current drain in operation , i cc 2 -- m a ambient temperature, ta -- c reference voltage , vref -- mv ambient temperature, ta -- c fb pin bias current , iref -- na ambient temperature, ta -- c oscillation frequency , f osc -- khz ambient temperature, ta -- c maximum on duty, d max -- % ambient temperature, ta -- c oscillation frequency during short-circuit protection , f oscs -- khz ambient temperature, ta -- c ambient temperature, ta -- c --20 0 40 80 20 60 --20 0 40 80 20 60 340 330 320 6.0 6.5 5.0 5.5 4.0 4.5 f oscs -- ta 310 350 3.0 3.5 7.0 --40 100 i ss -- ta --40 100 v in = 12v v in = 12v ss = 0v 360
LV5876MX ps no.a1857-6/7 reference data (2) (* measurement circ uit is shown in ? block diagram and sample application circuit?) ? output voltage lipple iload=1.0a [0.5usec/div] ? load transient response iload = 0.5a ? 1.5a [100 sec/div] ch2:vout [20mv/div] ch4:iload [1.0a/div] ch2:vout [50mv/div] ch4:iload [1.0a/div] venh -- ta 0.8 1.6 2.0 2.4 1.2 1.4 1.8 2.2 1.0 2.8 --40 --20 0 40 80 20 60 --20 0 40 80 20 60 --20 0 40 80 20 60 0.5 1.0 100 venl -- ta 0.6 2.6 --40 1.0 2.0 3.0 0.5 1.0 100 icl -- ta 2.5 3.0 3.5 4.0 4.5 5.0 1.0 4.0 2.0 3.0 5.0 5.5 --40 100 load current -- a current limit 0.0 6.0 0.0 4.0 load current -- a efficiency -- load current 76 80 84 88 92 96 4.90 4.94 4.98 5.02 5.06 5.10 0.0 2.0 load current -- a load regulation 0.0 2.0 v in = 12v v in = 12v v in = 12v y v out = 5v v in = 12v v out = 5v v out = 1.2v 3.3v 5.0v 25 c -30 c ta = 90 c 25 c -30 c 1.5 ta = 90 c 1.5 ambient temperature, ta -- c en low-threshold voltage , venl -- v ambient temperature, ta -- c current limit peak , icl -- a output voltage , v out -- v efficiency -- % output voltage , v out -- v ambient temperature, ta -- c en high-threshold voltage , venh -- v
LV5876MX ps no.a1857-7/7 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. ? v in start up waveform rload = 3.3 [1msec/div] ? v in stop waveform rload = 3.3 [0.2msec/div] ? en start up waveform rload = 3.3 [1msec/div] ? en stop waveform rload = 3.3 [0.2msec/div] considerations for the design ? insertion of serial beads in the schottky diode for removal of noise may cause generation of the negative voltage deviating from the absolute maximum rating at the sw pin, resulting in failure of normal operation. in such an event, do not insert beads as above described and, instead, remove noise by means of the boot resistance rb this catalog provides information as of october, 2010. specifications and information herein are subject to change without notice. ch3:vout [2.0v/div] ch2:ss [1.0v/div] ch1:vin [10v/div] ch3:vout [2.0v/div] ch2:ss [1.0v/div] ch1:vin [10v/div] ch3:vout [2.0v/div] ch2:ss [1.0v/div] ch1:en [5/div] ch3:vout [2.0v/div] ch2:ss [1.0v/div] ch1:en [5v/div]
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