unisonic technologies co., ltd UC34463 linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2012 unisonic technologies co., ltd qw-r103-055.a 200khz, 2a pwm buck switching regulator ? description utc UC34463 is a pwm control, step down dc to dc power supply, fixed out 5v, with ca/cv mode and output line voltage loss compensation function. external en port can control shutdown of the ic. ic internal integration of vari ous protection function, such as scp, otp, ocp and so on. the highest working voltage is up to 40v. the built-in compensation simplifies the peripheral applications. the packages are available in a standard 8-lead sop8. ? features * voltage mode non-synchronous pwm control * thermal-shutdown and cu rrent-limit protection * on/off shutdown control input * input voltage range up to 40v * output load current: 2a * 200 khz fixed frequency internal oscillator * low power standby mode * built-in switching transistor on chip sop-8 ? ordering information ordering number package packing lead free halogen free UC34463l-s08-r UC34463g-s08-r sop-8 tape reel UC34463l-s08-t UC34463g-s08-t sop-8 tube (1) r: tape reel, t: tube (2) s08: sop-8 (3) halogen free, l: lead free UC34463l-s08-r (1) packing type (2) package type (3) lead free
UC34463 linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r103-055.a ? pin configuration ? pin description pin no. pin name description 1 v cc operating voltage input 2 comp compensation 3 en shutdown pin 4 gnd ground. 5 v ref 5v reference voltage 6 s- negative input 7 s+ positive input 8 sw switching output ? block diagram en comp s- vref vcc sw gnd osc. cv bias start 2.5v ref 2a switch s+ ca pwm driver ocp 5v ref - + + - + - -
UC34463 linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r103-055.a ? absolute maximum rating parameter symbol ratings unit supply voltage v cc +45 v power dissipation p d internally limited w storage temperature t stg -65 ~ +150 c operating temperature t opr -40 ~ +125 c note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? electrical characteristics (v in =12v, i load = 0.2a, unless otherwise specified) parameter symbol test conditions min typ max unit oscillator frequency f osc 170 200 220 khz oscillator frequency of short circuit protect f scp when current limit occurred and v out low 30 khz saturation voltage v sat i out =1.5a no outside circuit v out =0v force driver on 1.25 1.4 v 1.25 1.5 max. duty cycle(on) dc v out =0v force driver on 100 % min. duty cycle(off) v out =12v force driver off 0 current limit i cl peak current no outside circuit v out =0 force driver on 2.4 2.9 3.3 a 2.4 2.9 3.6 output leakage current output = 0v i l no outside circuit v out =12 force driver off -200 ua output = -1v v in =24v -5 ma quiescent current i q v out =12 force driver off 5 10 ma standby quiescent current i stby on/off pin=5v, v in =24v 70 150 ua 70 200 on/off pin logic input threshold voltage v il low (regulator on) 1.3 0.6 v v ih high (regulator off) 2.0 1.3 on/off pin logic input current i h v logic =2.5v (off) 0.01 ua on/off pin input current i l v logic =0.5v (on) -0.1 -1 over temperature shutdown threshold ts t j increasing 175 c t j decreasing 150
UC34463 linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r103-055.a ? typical application circuit note: if v cc >24v, comp pin to gnd need to add 0. 1uf (option) compensation capacitor
UC34463 linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r103-055.a ? typical characteristics 1. boot power (ch2: yellow 5v/div, ch3: blue 2v/div) time (5ms/div) 02550 5v 0 2v time (5ms/div) 02550 5v 0 0 0 2v v in =12v v in =24v 2. ca mode
UC34463 linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r103-055.a 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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