datasheet 3a 160khz 32v buck dc/dc converter with cv/cc loop XL2006 rev 1.2 1 features n wide 8v to 32v input voltage range n output adjustable from 0.8v to 26v n minimum drop out 0.3v n fixed 160khz switching frequency n maximum 3a output current capability n internal optimize power mosfet n excellent line and load regulation n high efficiency up to 92% n ttl shutdown capability n en pin with hysteresis function n with output constant current loop n built in constant voltage (cv) loop n built in constant current (cc) loop n built in thermal shutdown function n built in output short protection n sop8-ep package applications n car charger n battery charger general description the XL2006 is a 160 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 XL2006 v?mw`r?y?b? w w w . g o f o t e c h . c o m
datasheet 3a 160khz 32v buck dc/dc converter with cv/cc loop XL2006 rev 1.2 2 pin configurations XL2006 1 3 5 2 4 fb ocset en vin 6 7 8 sw gnd nc nc figure2. pin configuration of XL2006 (top view) table 1 pin description pin number pin name description 1,6 nc no connected. 2 vin supply voltage input pin. XL2006 operates from a 8v to 32v dc voltage. bypass vin to gnd with a suitably large capacitor to eliminate noise on the input. 3 sw power switch output pin (sw). output is the switch node that supplies power to the output. (note: connected the back exposed pad to sw .) 4 gnd g round pin. 5 fb feedback pin (fb). through an external resistor divider network, feedback senses the output voltage and regulates it. the feedback threshold voltage is 0.8v. 7 en enable pin. drive en pin low to turn off the device, drive it high to turn it on. 8 ocset output constant current set pin; the exposed pad is sw n ~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? w w w . g o f o t e c h . c o m
datasheet 3a 160khz 32v buck dc/dc converter with cv/cc loop XL2006 rev 1.2 3 function block figure3. function block diagram of XL2006 ordering information part number marking id lead free lead free packing type XL2006e1 XL2006e1 tube package temperature range XL2006tre1 XL2006e1 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 34 v fb pin voltage v fb -0.3 to vin v en pin voltage ven -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 60 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 n ~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? w w w . g o f o t e c h . c o m
datasheet 3a 160khz 32v buck dc/dc converter with cv/cc loop XL2006 rev 1.2 4 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. XL2006 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 30v, vout=5v iload=0.2a 780 800 820 mv efficiency ? vin=12v ,vout=5v iout=2.1a - 89 - % electrical characteristics (dc parameters) vin = 12v, gnd=0v, vin & gnd parallel connect a 100uf/35v capacitor; iout=500ma, t a = 25; the others floating unless otherwise specified, system parameters reference figure4. parameters symbol test condition min. typ. max. unit input operation voltage vin 8 32 v shutdown supply current i stby v en =0 v 60 200 u a quiescent supply current i q v en =2v, v fb =vin 2 . 5 5 ma oscillator frequency fosc 128 160 192 khz en pin threshold v en high (regulator on) low (regulator off) 1.7 1.1 v output power pmos rdson v fb =0v, vin=12v, i sw =2a 60 80 mohm output voltage set vfb vout=(1+r2/r1)*vfb 0.78 0. 8 0.82 v n ~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? w w w . g o f o t e c h . c o m
datasheet 3a 160khz 32v buck dc/dc converter with cv/cc loop XL2006 rev 1.2 5 typical application circuit (car charger) figure4. XL2006 typical application circuit (car charger) figure5. output voltage vs output current curve n ~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? w w w . g o f o t e c h . c o m
datasheet 3a 160khz 32v buck dc/dc converter with cv/cc loop XL2006 rev 1.2 6 figure6. output current vs efficiency curve figure7. rcs vs output current select curve n ~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? w w w . g o f o t e c h . c o m
datasheet 3a 160khz 32v buck dc/dc converter with cv/cc loop XL2006 rev 1.2 7 schottky diode selection table current surface mount through hole vr (the same as system maximum input voltag e) 20v 30v 40v 1n 5817 1n 5818 1n5819 1a ss12 ss13 ss14 1n 5820 1n 5821 1n5822 mbr320 mbr330 mbr340 sk32 sk33 sk34 30wq 03 30wq04 31dq 03 31dq04 3a sr302 sr303 sr304 n ~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? w w w . g o f o t e c h . c o m
datasheet 3a 160khz 32v buck dc/dc converter with cv/cc loop XL2006 rev 1.2 8 package information package information (sop8-ep) n ~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? w w w . g o f o t e c h . c o m
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