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cystech electronics corp. spec. no. : c543e5/f5 issued date : 2004.02.27 revised date :2007.12.13 page no. : 1/12 LM2576-XXE5/f5 cystek product specification simple switcher 3a step- down voltage regulator LM2576-XXE5/f5 features 3.3v, 5v, 12v, 15v, and adjustable output versions. adjustable version output voltage range, 1.23v to 37v 4% max over line and load conditions. guaranteed 3a output current. wide input voltage range. requires only 4 external components 52 khz fixed frequency oscillator ttl shutdown capability, low power standby mode. high efficiency uses readily available standard inductors. thermal shutdown and current limit protection. description the LM2576-XXE5/f5 series of regulators are monolithic inte grated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driv ing 3a load with excellent line and load regulation. these devices are available in fixed output voltages of 3.3v, 5v, 12v, 15v, and an adjustable output version. requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator. the LM2576-XXE5/f5 series offers a high-efficiency replace ment for popular three-terminal linear regulators. it substantially reduces the size of the heat si nk, and in some cases no heat sink is required. a standard series if inductors optimized for use w ith the lm2576 are available from several different manufacturers. this feature greatly simplifi es the design of switch-mode power supplies. other features include a guaranteed 4% tolerance on out put voltage within specified input voltages and output load conditions, and 10% on the o scillator frequency. external shutdown is included, featuring 50 a (typical) standby current. the output switch includes cycle-by-cyc le current limiting, as well as thermal shutdown for full protection under fault conditions. applications simple high-efficiency step-down (buck) regulator. efficient pre-regulator for linear regulators. on-card switching regulators. positive to negative converter (buck-boost).
cystech electronics corp. spec. no. : c543e5/f5 issued date : 2004.02.27 revised date :2007.12.13 page no. : 2/12 LM2576-XXE5/f5 cystek product specification typical application ( fixed output voltage version ) + + + 7v-40v unregulated +vin 35 2 4 +5v regulated output pl2576-5.0 1 gnd on/off feedback output dc input 3a load cout l1 d1 1000 f 1n5822 100 h cin 100 f lm2576-50 figure. 1 block diagram 1 4 r2 r1 1.23v reference 52khz oscillator reset thermal current shutdown limit internal regulator on / off 5 2 3 + vin cin feedback on/off output l1 + l o a d gnd d1 cout vout 3 amp switch driver comparator fixed gain error amp 1.0k unregulated dc input 3.3v, r2=1.7k 5v, r2=3.1k 12v, r2=8.84k 15v, r2=11.3k for adjustable version, r1=open, r2=0 band-gap ordering information
cystech electronics corp. spec. no. : c543e5/f5 issued date : 2004.02.27 revised date :2007.12.13 page no. : 3/12 LM2576-XXE5/f5 cystek product specification absolute maximum ratings (note 1) parameter symbol value unit supply voltage v cc 45 v on/off pin input voltage v sd -0.3 ~ +v in v output voltage to ground v out -1 v power dissipation p d internally limited w operating temperature topr -40 ~ +125 storage temperature tstg -65 ~ +150 esd susceptibility (note 2) 2000 v lead temperature (soldering, 10 seconds) t l 260 lm2576-33 electrical characteristics specifications with standard type face are for t j =25c, and those with boldface type apply over full operating temperature range symbol parameter conditions typ min max units system parameters (note 3) test circuit figure 2 v out output voltage v in =12v, i load =0.5a circuit of figure 2 3.3 3.234 3.336 v v out output voltage 6v v in 40v, 0.5a i load 3a circuit of figure 2 3.3 3.168/ 3.135 3.432/ 3.465 v efficiency v in =12v, i load =3a 75 % lm2576-50 electrical characteristics specifications with standard type face are for t j =25c, and those with boldface type apply over full operating temperature range symbol parameter conditions typ min max units system parameters (note 3) test circuit figure 2 v out output voltage v in =12v, i load =0.5a circuit of figure 2 5.0 4.9 5.1 v v out output voltage 8v v in 40v, 0.5a i load 3a circuit of figure 2 5.0 4.800/ 4.750 5.200/ 5.250 v efficiency v in =12v, i load =3a 77 %
cystech electronics corp. spec. no. : c543e5/f5 issued date : 2004.02.27 revised date :2007.12.13 page no. : 4/12 LM2576-XXE5/f5 cystek product specification lm2576-12 electrical characteristics specifications with standard type face are for t j =25c, and those with boldface type apply over full operating temperature range symbol parameter conditions typ min max units system parameters (note 3) test circuit figure 2 v out output voltage v in =25v, i load =0.5a circuit of figure 2 12 11.76 12.24 v v out output voltage 15v v in 40v, 0.5a i load 3a circuit of figure 2 12 11.52/ 11.40 12.48/ 12.60 v efficiency v in =15v, i load =3a 88 % lm2576-15 electrical characteristics specifications with standard type face are for t j =25c, and those with boldface type apply over full operating temperature range symbol parameter conditions typ min max units system parameters (note 3) test circuit figure 2 v out output voltage v in =25v, i load =0.5a circuit of figure 2 15 14.7 15.3 v v out output voltage 18v v in 40v, 0.5a i load 3a circuit of figure 2 15 14.40/ 14.25 15.60/ 15.75 v efficiency v in =18v, i load =3a 88 % lm2576-adj electrical characteristics specifications with standard type face are for t j =25c, and those with boldface type apply over full operating temperature range symbol parameter conditions typ min max units system parameters (note 3) test circuit figure 2 v out feedback voltage v in =12v, i load =0.5a, v out =5v, circuit of figure 2 1.230 1.217 1.243 v v out feedback voltage 8v v in 40v, 0.5a i load 3a v out =5v, circuit of figure 2 1.230 1.193/ 1.180 1.267/ 1.280 v efficiency v in =12v, i load =3a, v out =5v 77 %
cystech electronics corp. spec. no. : c543e5/f5 issued date : 2004.02.27 revised date :2007.12.13 page no. : 5/12 LM2576-XXE5/f5 cystek product specification all output voltage versions electrical characteristics specifications with standard type face are for t j =25c, and those with boldface type apply over full operating temperature range. unless otherwise specified, v in =12v for the 3.3v, 5.0v, and adjustable versions, v in =25v for the 12v version, and v in =30v for the 15v version. i load =500ma. symbol parameter conditions typ min max units ib feedback bias current v out =5v (adjustable version only) 50 - 100/ 500 na f o oscillator frequency (note 8) 52 47/ 42 58/ 63 khz v sat saturation voltage i out =3a (note 4) 1.4 - 1.8/ 2.0 v dc maximum duty cycle (on) (note 5) 98 93 - % i cl current limit (notes 4, 8) 5.8 4.2/ 3.5 6.9/ 7.5 a i l output leakage current (notes 6, 7) output = 0v output = -1v - 7.5 - - 2 30 ma i q quiescent current (note 6) 5 - 10 ma i stby standby quiescent current on/off pin=5v (off) 50 - 200 a on/off control v ih v out =0v 1.4 2.2/ 2.4 - v v il on/off pin logic input level v out =nominal output voltage 1.2 - 1.0/ 0.8 v i ih on/off pin=5v (off) 12 - 30 a i il on/off pin input current on/off pin=0v (on) 0 - 10 a note 1 : absolute maximum ratings indicate limits beyond which damage to the device may occur. operating ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. for guaranteed specifications and test cond itions, see the electrical characteristics. note 2 : all limits guaranteed at room temperat ure (standard type face) and at temp erature extremes (bold type face). note 3 : external components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. when the lm2576 is used as shown in the figure 2 test circuit, system performance will be as shown in system parameters sec tion of electrical characteristics. note 4 : output pin sourcing current. no diode, inductor or capacitor connected to output. note 5 : feedback pin removed from output and connected to 0v. note 6 : feedback pin removed from output and connected to +12v for the adjustable, 3.3v, and 5v versions, and +25v for the 12v and 15v versions, to force the output transistor off. note 7 : v in =40v. note 8 : the oscillator frequency reduces to approximately 11 khz in th e event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. this self protection feature lowers the average power dissipation of the ic by lowering the minimum duty cycle from 5% down to approximately 2%.
cystech electronics corp. spec. no. : c543e5/f5 issued date : 2004.02.27 revised date :2007.12.13 page no. : 6/12 LM2576-XXE5/f5 cystek product specification typical performance characteristics ( circuit of figure 2 ) normalized output voltage -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 -50 -25 0 25 50 75 100 125 junction temperature() v in = 20v,i load = 500ma normalized at t j = 25 line regulation -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 1.2 1.4 0 102030405 input voltage(v) 0 i load = 500ma, t j = 25 3.3v, 5v & adj 12v & 15v dropout voltage 0 0.25 0.5 0.75 1 1.25 1.5 1.75 -75 -50 -25 0 25 50 75 100 125 150 junction temperature() i load =0.2a i load =1a i load =3a l 1 = 150h rind = 0.1 standby quiescent current 0 25 50 75 100 125 150 175 200 -50 -25 0 25 50 75 100 125 junction temperature() v in =40v v in =12v v on/off = 5v quiescent current 4 6 8 10 12 14 16 18 20 0 1020304050 input voltage (v) i load =0.2a i load =3a v out = 5v, measured at ground pin, t j = 25 current limit 4 4.5 5 5.5 6 6.5 -75 -50 -25 0 25 50 75 100 125 150 junction temperature () v in =25v
cystech electronics corp. spec. no. : c543e5/f5 issued date : 2004.02.27 revised date :2007.12.13 page no. : 7/12 LM2576-XXE5/f5 cystek product specification switch saturation voltage 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 00.511.522.53 switch current (a) 150 25 -55 efficiency 60 65 70 75 80 85 90 95 0 102030405 input voltage (v) 0 i load = 3a i load = 0.2a i load = 0.2a i load = 3a 5v 15v out t j = 25 oscillator frequency -8 -6 -4 -2 0 2 4 6 8 -75 -50 -25 0 25 50 75 100 125 150 junction temperature () normalized at 25 v in = 40v v in = 12v minimum operating voltage 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 -50 -25 0 25 50 75 100 125 junction temperature () ad j ustable version onl y v out P1.23v i load = 0.5a quiescent current vs duty cycle 0 2.5 5 7.5 10 12.5 15 17.5 20 0 2040608010 duty cycle (%) 0 adjustable version only v in =7v v in =40v i load = 0.5a feedback voltage vs duty cycle -20 -15 -10 -5 0 5 10 15 20 0 2040608010 duty cycle (%) 0 adjustable version only i load = 0.5a v in =40v v in =7v
cystech electronics corp. spec. no. : c543e5/f5 issued date : 2004.02.27 revised date :2007.12.13 page no. : 8/12 LM2576-XXE5/f5 cystek product specification minimum power dissipation 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0 102030405060708090100 ambient temperature () ja = 32 / w ja = 37/w ja = 50/w ja = 73/w feedback pin current -100 -75 -50 -25 0 25 50 75 100 -75 -50 -25 0 25 50 75 100 125 150 junction temperature () adjustable version only switching waveforms 0 2a 4a 0 2a 4a 0 50v 5 s/ div load transient response 0 1a 2a 3a -100mv 0 100mv load current output voltage change 100 s / div vout=15v a : output pin voltage, 50 v / div b : output pin current, 2a / div c : inductor current, 2a / div d : output ripple voltage, 50mv / div ac coupled horizontal time base : 5 s / div a b c d
cystech electronics corp. spec. no. : c543e5/f5 issued date : 2004.02.27 revised date :2007.12.13 page no. : 9/12 LM2576-XXE5/f5 cystek product specification test circuit and layout guidelines as in any switching regulator, layout is very important . rapidly switching current s associated with wiring inductance generate voltage transi ents which can cause problems. for minimal inductance and ground loops, the length of the lead s indicated by heavy lines should be kept as short as possible. single-point grounding (as indicated) or ground plane construction should be used for best results. when using the adjustable version, physically locate the programming re sistors near the regulator, to keep the sensitive feedback wiring short. + cin d1 l1 + cout vin unregulated dc input pl2576 gnd 3 +vin feedback 4 2 output 5 on / off 100 f mbr360 100 h 1000 f fixed output l o a d 1 vout cin--100 f, 75v, aluminum electrolytic cout--1000 f, 25v, aluminum electrolytic l1--100 h, pulse eng, pe92108 d1--schottky, mbr360 r1--2k, 0.1% r2--6.12k, 0.1% + cin d1 l1 + cout 7v-40v unregulated dc input l2576-adj gnd 3 +vin feedback 4 2 output 5 on / off 100 f mbr360 100 h 1000 f l o a d 1 vout p r2 r1 5.00v adjustable output voltage version fixed output voltage versions lm2576 lm2576-adj vout=vref(1+ r2=r1( where vref=1.23v, r1 between 1k and 5k figure 2 r2 r1 ) vout vref -1)
cystech electronics corp. spec. no. : c543e5/f5 issued date : 2004.02.27 revised date :2007.12.13 page no. : 10/12 LM2576-XXE5/f5 cystek product specification to-263-5l dimension date code marking: lm2576 vout: 3.3v -33 5.0v -50 12v -12 15v -15 adj blank 5-lead to-220-5l plastic package cystek package code: e5 style: pin 1.vin 2.vout 3.gnd 4.feedback 5.on/off inches millimeters inches millimeters dim min. max. min. max. dim min. max. min. max. a 0.173 0.189 4.40 4.80 l5 0.244 0.260 6.20 6.60 b 0.030 0.039 0.76 1.00 c1 0.049 0.057 1.25 1.45 c 0.014 0.020 0.36 0.50 l 0.522 0.561 13.25 14.25 d 0.339 0.354 8.60 9.00 e 0.067 ref 1.70 ref e 0.386 0.409 9.80 10.4 l1 0.102 0.114 2.60 2.89 l4 0.579 0.602 14.7 15.3 0.146 0.156 3.71 3.96 notes: 1.controlling dimension: millimeter 2.maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material. 3.if there is any question with packing specification or packing method, please c ontact your local cystek sales office. material: ? mold compound: epoxy resin family, flammability solid burning class: ul94v-0
cystech electronics corp. spec. no. : c543e5/f5 issued date : 2004.02.27 revised date :2007.12.13 page no. : 11/12 LM2576-XXE5/f5 cystek product specification to-263-5l dimension marking: lm2576 date code 3.3v -33 vout: 5.0v -50 12v -12 15v -15 adj blank style: pin 1.vin 2.vout 3.gnd 4.feedback 5.on/off 5-lead to-263-5l plastic package cystek package code: f5 inches millimeters inches millimeters dim min. max. min. max. dim min. max. min. max. a 0.173 0.189 4.40 4.80 c2 0.049 0.057 1.25 1.45 b 0.026 0.036 0.66 0.91 l2 0.050 ref 1.27 ref l4 0.000 0.012 0.00 0.30 d 0.339 0.354 8.60 9.00 c 0.014 0.020 0.36 0.50 e 0.067 ref 1.70 ref l1 0.090 0.110 2.29 2.79 l 0.575 0.622 14.6 15.8 e 0.386 0.409 9.80 10.4 0 8 0 8 notes: 1.controlling dimension :millimeter 2.maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material. 3.if there is any question with packing specification or packing method, please c ontact your local cystek sales office. material: ? mold compound: epoxy resin family, flammability solid burning class: ul94v-0 recommended wave soldering condition soldering time product peak temperature pb-free devices 260 +0/-5 c 5 +1/-1 seconds
cystech electronics corp. spec. no. : c543e5/f5 issued date : 2004.02.27 revised date :2007.12.13 page no. : 12/12 LM2576-XXE5/f5 cystek product specification recommended temperature profile for ir reflow profile feature sn-pb eutectic assembly pb-free assembly average ramp-up rate (tsmax to tp) 3 c/second max. 3 c/second max. preheat ? temperature min(t s min) ? temperature max(t s max) ? time(ts min to ts max ) 100 c 150 c 60-120 seconds 150 c 200 c 60-180 seconds time maintained above: ? temperature (t l ) ? time (t l ) 183 c 217 c 60-150 seconds 60-150 seconds peak temperature(t p ) 240 +0/-5 c 260 +0/-5 c time within 5 c of actual peak temperature(tp) 10-30 seconds 20-40 seconds ramp down rate 6 c/second max. 6 c/second max. time 25 c to peak temperature 6 minutes max. 8 minutes max. note : all temperatures refer to topside of t he package, measured on the package body surface. important notice: ? all rights are reserved. reproduction in whole or in part is prohibited without the prior written approval of cystek. ? cystek reserves the right to make changes to its products without notice. ? cystek semiconductor products are not warranted to be suitable for use in life-support applications, or systems. ? cystek assumes no liability for any consequence of customer pr oduct design, infringement of pat ents, or application assistance .

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