datasheet 3a 150khz 40v buck li battery charger XL4101 rev 1.2 www.xlsemi.com 1 features n wide 4.5v to 40v input voltage range n output adjustable from 1.235v to 37v n minimum drop out 1.5v n fixed 150khz switching frequency n 3a constant output current capability n internal optimize power transistor n excellent line and load regulation n with output constant current loop n built in thermal shutdown function n built in current limit function n built in output over voltage protection n to263-5l package applications n car charger n battery charger general description the XL4101 is a 150khz 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 over current protection function is built inside. an internal compensation block is built in to minimize external component count. figure1. package type of XL4101
datasheet 3a 150khz 40v buck li battery charger XL4101 rev 1.2 www.xlsemi.com 2 pin configurations figure2. pin configuration of XL4101 (top view) table 1 pin description pin number pin name description 1 vin supply voltage input pin. XL4101 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 sw power switch output pin (sw). output is the switch node that supplies power to the output. 3 gnd ground pin.(note: connected the back exposed pad to pin3 .) 4 fb feedback pin (fb). through an external resistor divider network, feedback senses the output voltage and regulates it. the feedback threshold voltage is 1.235v. 5 cs output current sense pin; (iload=0.155v/rcs)
datasheet 3a 150khz 40v buck li battery charger XL4101 rev 1.2 www.xlsemi.com 3 function block figure3. function block diagram of XL4101 typical application circuit (car charger) figure4. XL4101 typical application circuit (li battery charger)
datasheet 3a 150khz 40v buck li battery charger XL4101 rev 1.2 www.xlsemi.com 4 typical application circuit (buck led constant current driver) figure5. XL4101 typical application circuit (led constant current driver) ordering information order information marking id package type packing type supplied as XL4101e1 XL4101e1 to263-5l 800 units on tape & reel xlsemi pb-free products, as designated with e1 suffix in the par number, are rohs compliant. absolute maximum ratings note1 parameter symbol value unit input voltage vin -0.3 to 45 v fb pin voltage v fb -0.3 to vin v sw pin voltage v sw -0.3 to vin v power dissipation p d internally limited mw thermal resistance (junction to ambient, no heatsink, free air) r ja 30 o c/w operating junction temperature t j -40 to 125 o c storage temperature t stg -65 to 150 o c lead temperature (soldering, 10 sec) t lead 260 o c 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 indicated in the operation is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability.
datasheet 3a 150khz 40v buck li battery charger XL4101 rev 1.2 www.xlsemi.com 5 XL4101 electrical characteristics t a = 25 ;unless otherwise specified. symbol parameter test condition min. typ. max. unit system parameters test circuit figure4 vfb feedback voltage vin = 8v to 32v, vout=5v iload=0.2a to 3a 1.198 1.235 1.272 v efficiency ? vin=12v ,vout=5v iout=3a - 80 - % electrical characteristics (dc parameters) vin = 12v, 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 quiescent supply current i q v fb =vin 2 5 ma oscillator frequency fosc 127 150 172 khz switch current limit i l v fb =0 3.6 a output saturation voltage v ce v fb =0v i sw =2a 1.1 1.4 v constant current sense voltage v cs 0.140 0.155 0.170 v 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
datasheet 3a 150khz 40v buck li battery charger XL4101 rev 1.2 www.xlsemi.com 6 package information to263-5l
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