unisonic technologies co., ltd p3576 linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2012 unisonic technologies co., ltd qw-r103-054.e 50khz, 2a pwm buc k dc/dc converter ? description the utc p3576 series is a step-down switching regulator which is able to provide 2a output current. the available versions of output voltage are 2.5v, 3.3v, 5v, 12v and adjustable. ? features * output load current: 2a * adjustable version output voltage range, 1.23v ~ 38.5v4% * operating voltage can be up to 40v * low power standby mode * high efficiency * internal current and thermal limit * built-in switching transistor on chip. ? ordering information ordering number package packing lead free halogen free P3576L-XX-S08-R p3576g-xx-s08-r sop-8 tape reel p3576l-xx-s08-t p3576g-xx-s08-t sop-8 tube
p3576 linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r103-054.e ? marking information package voltage code marking sop-8 15 :1.5v 28 :2.8v ad:adj ? pin configuration 1 2 3 4 8 7 6 5v ss v ss v ss v ss v cc sw fb en ? pin description pin no. pin name description 1 v cc operating voltage input 2 sw switching output 3 fb output voltage feedback control 4 en on/off shutdown 5~8 v ss gnd pin
p3576 linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r103-054.e ? block diagram v cc 200mv 220mv en start up 2.5v regulator 1.235v reference current source bias fb r2 r1 + - amp comp. + - comp. 50kh z osc. comp. + - comp. - + current limit control + driver thermal shutdown 2a switch sw v ss adj : r2=0 , r1=open
p3576 linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r103-054.e ? absolute maximum rating (t a =25c, unless otherwise specified ) parameter symbol ratings unit supply voltage v cc +45 v on/off pin input voltage v en -0.3 ~ 40 v feedback pin voltage v fb -0.3 ~ 12 v output voltage to ground v out -0.8 v operating supply voltage v op +4.5 ~ +40 v power dissipation p d internally limited w junction temperature t j +125 c storage temperature t stg -65 ~ +150 c note: absolute maximum ratings are those values beyo nd which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? thermal data parameter symbol ratings unit junction to ambient ja 60 /w junction to case jc 20 /w note: ja is measured with the pcb copper area(need connect to sw pins) of approximately 1.5 in 2 (multi-layer). ? electrical characteristics (t a =25c, unless otherwise specified, v cc =12v for 3.3v, 5v, adjustable version and v cc =18v for the 12v version. i load =0.2a.) parameter symbol test conditions min typ max unit quiescent current i q v fb =12v force driver off 4 8 ma feedback bias current adj i fb v fb =1.3v -10 -50 na shutdown supply current i sd en pin=5v, v cc =40v 100 200 a oscillator frequency f osc 44 50 56 khz oscillator frequency of short circuit protect adj f scp v fb <0.5v 25 khz fixed v out p3576 linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r103-054.e ? typical application circuit v in =12v c 1 470 f c 2 0.1 f c 3 470 f c 6 0.1 f d 1 3a/40v r 1 4.7k r 2 1.5k 47 h l 1 1 2 2 1 3 4 5 6 7 8 v ss v ss v ss v ss v cc sw fb en utc p3576 u1 v out =5.0v/2a (1) adjustable output voltage version v in =12v c 1 470 f c 2 0.1 f c 3 470 f c 6 0.1 f d 1 2a/40v r 1 1.8k r 2 1.8k 33 h l 1 1 2 2 1 3 4 5 6 7 8 v ss v ss v ss v ss v cc sw fb en utc p3576 u1 v out =2.5v/2a on/off c 4 0.1 f r 3 100k (2) adjustable output voltage version with delayed startup v out =v fb (1+r 1 /r 2 ), v fb =1.23v, r 2 =0.47k ~ 3k table 1 resistor select for output voltage setting v out r2 r1 5v 1.5k 4.7k 1.8k 5.6k 3.3v 1.5k 2.5k 1.8k 3.0k 2.5v 1.8k 1.8k 1.8v 1.8k 0.82k l1 recommend value (i out =2a) v out 2.5v 3.3v 5v 12v v in =12v 33 h 33 h 47 h na v in =24v 33 h 33 h 47 h 68 h
p3576 linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r103-054.e ? typical application circuit (cont.) utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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