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datasheet 3a 52khz 40v buck dc to dc converter XL2576 rev 2.6 www.xlsemi.com 1 features ? wide 4.5v to 40v input voltage range ? 5v,12v and adjustable versions ? output adjustable from 1.23v to 37v ? maximum duty cycle 100% ? minimum drop out 1.5v ? fixed 52khz switching frequency ? 3a constant output current capability ? internal optimize power transistor ? high e fficiency ? excellent line and load regulation ? ttl shutdown capability ? on/off pin with hysteresis function ? built in thermal shutdown function ? built in current limit function ? available in to-220,to-263 packages applications ? lcd monitor and lcd tv ? digital photo frame ? set-up box ? adsl modem ? telecom / networking equipment general description the XL2576 is a 52 khz fixed frequency pwm buck (step-down) dc/dc converter, capable of driving a 3a load with high efficiency, low ripple and excellent line and load regulation. requiring a minimum number of external components, the regulator is simple to use and include internal frequency compensation and a fixed-frequency oscillator. the pwm control circuit is able to adjust the duty ratio linearly from 0 to 100%. an enable function, an over current protection function is built inside. an internal compensation block is built in to minimize external component count. figure1. package type of XL2576
datasheet 3a 52khz 40v buck dc to dc converter XL2576 rev 2.6 www.xlsemi.com 2 pin configurations figure2. pin configuration of XL2576 (top view) table 1 pin description pin number pin name description 1 vin supply voltage input pin. XL2576 operates from a 4.5v to 40v dc voltage. bypass vin to gnd with a suitably large capacitor to eliminate noise on the input. 2 output power switch output pin (sw). output is the switch node that supplies power to the output. 3 gnd ground pin. care must be taken in layout. this pin should be placed outside of the schottky diode to output capacitor ground path to prevent switching current spikes from inducing voltage noise into XL2576. 4 feedback feedback pin (fb). through an external resistor divider network, feedback senses the out put voltage and regulates it. the feedback threshold voltage is 1.23v. 5 on/off enable pin. drive on/off pin low to turn on the device, drive it high to turn it off. floating is default low.
datasheet 3a 52khz 40v buck dc to dc converter XL2576 rev 2.6 www.xlsemi.com 3 function block figure3. function block diagram of XL2576 typical application circuit figure4. XL2576 typical applic ation circuit 12v-5v/3a
datasheet 3a 52khz 40v buck dc to dc converter XL2576 rev 2.6 www.xlsemi.com 4 ordering information marking id package temperature range lead free packing type supplied as XL2576t-adje1 tube to220-5l -40 o c ~ 85 o c XL2576t-5.0e1 tube XL2576s-adje1 800 units on tape & reel XL2576s-5.0e1 800 units on tape & reel to263-5l -40 o c ~ 85 o c XL2576s-12e1 800 units on tape & reel xlsemi pb-free products, as designated with ?e1? suffix in the par number, are rohs compliant. XL2576 circuit type package s: to263-5l t: to220-5l e1: lead free e1 version adj: adjust 5.0: 5v 12: 12v
datasheet 3a 52khz 40v buck dc to dc converter XL2576 rev 2.6 www.xlsemi.com 5 absolute maximum ratings note1 parameter symbol value unit input voltage vin -0.3 to 45 v feedback pin voltage v fb -0.3 to vin v on/off pin voltage v on/off -0.3 to vin v output switch pin voltage v output -0.3 to vin v power dissipation p d internally limited mw thermal resistance (to220 & to263) (junction to ambient, no heatsink, free air) r ja 30 oc/w operating junction temperature t j -40 to 125 oc storage temperature t stg -65 to 150 oc lead temperature (soldering, 10 sec) t lead 260 oc esd (hbm) >2000 v note1: stresses greater than those listed under maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those in dicated in the operation is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability.
datasheet 3a 52khz 40v buck dc to dc converter XL2576 rev 2.6 www.xlsemi.com 6 XL2576-5.0 electrical characteristics t a = 25 ;unless otherwise specified. symbol parameter test condition min. typ. max. unit system parameters test circuit figure7 vout output voltage vin = 7v to 40v iload=0.2a to 3a 4.8 5 5.2 v efficiency ? vin=12v ,vout=5v iout=3a - 78 - % XL2576-12 electrical characteristics t a = 25 ;unless otherwise specified. symbol parameter test condition min. typ. max. unit system parameters test circuit figure5 vout output voltage vin = 15v to 40v iload=0.2a to 2a 11.52 12 12.48 v efficiency ? vin=24v ,vout=12v iout=2a - 92 - % XL2576-adj electrical characteristics t a = 25 ;unless otherwise specified. symbol parameter test condition min. typ. max. unit system parameters test circuit figure8 vout output voltage vin = 4.5v to 40v iload=0.2a to 3a 1.193 1.23 1.267 v efficiency ? vin=12v ,vout=3v iout=3a - 73 - %
datasheet 3a 52khz 40v buck dc to dc converter XL2576 rev 2.6 www.xlsemi.com 7 electrical characteristics (dc parameters) vin = 12v for the 5v,and adjustable versions and vin=24v for the 12v version, gnd=0v, vin & gnd parallel connect a 220uf/50v capacitor; iout=500ma, t a = 25 ; the others floating unless otherwise specified. parameters symbol test condition min. typ. max. unit input operation voltage vin 4.5 40 v shutdown supply current i stby v on/off =5v 80 200 ua quiescent supply current i q v on/off =0v, v fb =vin 2 10 ma oscillator frequency fosc 40 52 64 khz switch current limit i l v fb =0 3.6 4.8 6.9 a on/off pin threshold v on/off high (regulator off) low (regulator on) 1.4 0.8 v i h v on/off =2.5v (off) 5 15 ua on/off pin input leakage current i l v on/off =0.5v (on) 0.2 5 ua output saturation voltage v ce v fb =0v i out =3a 1.3 1.5 v max. duty cycle d max v fb =0v 100 %
datasheet 3a 52khz 40v buck dc to dc converter XL2576 rev 2.6 www.xlsemi.com 8 test circuit and layout guidelines XL2576 adjustable $*/ $ $065 % - 6/3&(6-"5&% %$*/165 -0"% (/% 7*/ '&&%#"$, 065165 0/0'' 0/ 0'' 3&(6-"5&%065165 ,&&1'&&%#"$,8*3*/("8": '30.*/%6$503'-69 )&"7:-*/&4.645#&,&154)035"/%64& (306/%1-"/&$0/4536$5*0/'03#&453&46-54 3, 3 $'' -0$"5&5)&130(3"..*/(3&4*45034/&"3 5)&'&&%#"$,1*/64*/(4)035-&"%4 7065 33
figure5. standard test circuits and layout guides select r1 to be approximately 1k, us e a 1% resistor for best stability. c1 and cff are optional; in order to increase stability and reduce the input power line noise, cin and c1 must be placed near to pin1 and pin3; for output voltages greater than approximately 10 v, an additional capacito r cff is required. the compensation capacitor is typically between 100 pf and 33 nf, and is wired in parallel with the output voltage setting resistor, r2. it provides additional stab ility for high output voltage, low input-output voltages, and/or very low esr output capacito rs, such as solid tantalum capacitors. cff=1/(31*1000*r2); this capacitor type can be ceramic , plastic, silver mica, etc. (because of the unstable characteristics of ceramic capacito rs made with z5u material, they are not recommended.)
datasheet 3a 52khz 40v buck dc to dc converter XL2576 rev 2.6 www.xlsemi.com 9 XL2576 series buck regulator de sign procedure (fixed output) output capacitor (cout) conditions inductor (l1) through hole electrolytic surface mount tantalum output voltage (v) load current (a) max input voltage (v) inductance (uh) panasonic hfq series (uf/v) nichicon pl series (uf/v) avx tps series (uf/v) sprague 595d series (uf/v) 7 47 470/25 560/16 220/10 330/10 9 68 560/25 560/25 220/10 330/10 15 100 330/35 330/35 220/10 330/10 5 3 40 150 330/35 270/35 220/10 330/10 15 47 470/25 470/25 100/16 180/16 18 68 330/25 330/25 100/16 180/16 30 100 180/25 180/25 100/16 120/20 3 40 150 180/35 180/25 100/16 120/20 15 47 330/25 330/25 100/16 180/16 20 100 180/25 180/25 100/16 120/20 12 2 40 150 82/25 82/25 68/20 68/25
datasheet 3a 52khz 40v buck dc to dc converter XL2576 rev 2.6 www.xlsemi.com 10 XL2576 series buck regulator de sign procedure (adjustable output) through hole output electrolytic surface mount output capacitor output voltage (v) panasonic hfq series (uf/v) nichicon pl series (uf/v) feedforward capacitor avx tps series (uf/v) sprague 595d series (uf/v) feedforward capacitor 2 820/35 820/35 33nf 330/6.3 470/4 33nf 4 560/35 470/35 10nf 330/6.3 390/6.3 10nf 6 470/25 470/35 3.3nf 220/10 330/10 3.3nf 9 330/25 330/25 1.5nf 100/16 180/16 1.5nf 12 330/25 330/25 1nf 100/16 180/16 1nf 15 220/25 220/35 680pf 68/20 120/20 680pf 24 220/35 150/35 560pf 33/25 33/25 220pf 28 100/50 100/50 390pf 10/35 15/50 220pf schottky diode selection table current surface mount through hole vr (the same as system maximum input voltage) 20v 30v 40v 50v 60v 1a ? 1n5817 1n5818 1n5819 ? 1n5820 1n5821 1n5822 ? mbr320 mbr330 mbr340 mbr350 mbr360 ? sk32 sk33 sk34 sk35 sk36 ? 30wq03 30wq04 30wq05 ? 31dq03 31dq04 31dq05 3a ? sr302 sr303 sr304 sr305 sr306 ? 1n5823 1n5824 1n5825 ? sr502 sr503 sr504 sr505 sr506 ? sb520 sb530 sb540 sb550 sb560 5a ? 50wq03 50wq04 50wq05
datasheet 3a 52khz 40v buck dc to dc converter XL2576 rev 2.6 www.xlsemi.com 11 typical system application for 5v version figure6. XL2576-5.0 system parameters test circuit typical system application for 12v version figure7. XL2576-12 system parameters test circuit
datasheet 3a 52khz 40v buck dc to dc converter XL2576 rev 2.6 www.xlsemi.com 12 typical system application for adj version XL2576-adj $*/ $ vg7 % -vi" 7 -0"% (/% 7*/ '&&%#"$, 065165 0/0'' 0/ 0'' 7" $065 / vg7 3, 3, $''o 7065 33
figure8. XL2576-adj system pa rameters test circuit
datasheet 3a 52khz 40v buck dc to dc converter XL2576 rev 2.6 www.xlsemi.com 13 package information (1) to220-5l
datasheet 3a 52khz 40v buck dc to dc converter XL2576 rev 2.6 www.xlsemi.com 14 package information (2) to263-5l

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