unisonic technologies co., ltd p1596 linear integrated circuit www.unisonic.com.tw 1 of 7 copyright ? 2008 unisonic technologies co., ltd qw-r103-027,h 150khz, 1.5a pwm buck dc/dc converter ? description the utc p1596 series is a step-down switching regulator able to provide 1.5a output current. the av ailable output voltages are 2.5v, 3.3v, 5v, 12v and an adjustable output version. ? features * output load current: 1.5a * adjustable version output voltage range, 1.23v ~ 18v4% * 150khz 15% fixed switching frequency * voltage mode non-synchronous pwm control * thermal-shutdown and cu rrent-limit protection * operating voltage can be up to 24v * low power standby mode * high efficiency * internal current and thermal limit * built-in switching transistor on chip *pb-free plating product number: p1596l ? ordering information ordering number normal lead free plating package packing p1596-xx-ta5-t p1596l-xx-ta5-t to-220-5 tube p1596-xx-tb5-t p1596l-xx-tb5-t to-220b tube p1596-xx-tq5-r p1596l-xx-tq5-r to-263-5 tape reel p1596-xx-tq5-t p1596l-xx-tq5-t to-263-5 tube note: xx: output voltage, re fer to marking information.
p1596 linear integrated circuit unisonic technologies co., ltd 2 of 7 www.unisonic.com.tw qw-r103-027,h ? block diagram
p1596 linear integrated circuit unisonic technologies co., ltd 3 of 7 www.unisonic.com.tw qw-r103-027,h ? pin descriptions pin no. pin name descrition 1 v in operating voltage input 2 output switching output 3 gnd circuit ground 4 fb (feedback) output voltage feedback control 5 sd (shutdown) on/off shutdown ? marking information package voltage code marking to-220-5 to-220b to-263-5 25:2.5v 33:3.3v 50:5.0v 12:12v ad:adj ? thermal data parameter symbol ratings unit thermal resistance junction to case to-220b to-220-5 to-263-5 jc 3 3 4 /w
p1596 linear integrated circuit unisonic technologies co., ltd 4 of 7 www.unisonic.com.tw qw-r103-027,h ? absolute maximum ratings parameter symbol ratings unit maximum supply voltage v cc 28 v operating voltage v opr 4.5 ~ 22 v on/off pin input voltage v on/off -0.3 ~ +18 v feedback pin voltage v fb -0.3 ~ +18 v output voltage to gr ound (steady state) v out -1 v power dissipation p d internally limited w operating temperature t opr -40 ~ +125 storage temperature t stg -65 ~ +150 note absolute maximum ratings are those values beyond which the device which the device could be permanently damaged. absolute maximum ratings are stress ratings on ly and functional device operation is not implied. ? electrical characteristics (t j =25 , v in =12v for the 2.5v 3.3v, 5v, and adjustable version and v in =24v for the 12v version, i load =500ma.) parameter symbol test conditions min typ max unit 2.5v 3.8v Q v in Q 24v, 0.2a Q i load Q 1.5a 2.4 2.5 2.6 v 3.3v 4.75v Q v in Q 24v, 0.2a Q i load Q 1.5a 3.168 3.3 3.432 v 5.0v 7v Q v in Q 24v, 0.2a Q i load Q 1.5a 4.8 5.0 5.2 v output voltage 12v v out 15v Q v in Q 24v, 0.2a Q i load Q 1.5a 11.52 12 12.48 v 2.5v v in =12v, i load =1.5a 73 % 3.3v v in =12v, i load =1.5a 73 % 5.0v v in =12v, i load =1.5a 80 % efficiency 12v v in =24v, i load =1.5a 72 % utc p1596-adj output feedback v fb 4.75v Q v in Q 24v, 0.2a Q i load Q 1.5a v out programmed for 3v 1.193 1.23 1.267 v efficiency v in =12v, i load =1.5a 78 % all output voltage feedback bias current i bias adjustable version only, v fb =1.3v -10 -50 na oscillator frequency f osc (note 1) 127 150 173 khz saturation voltage v sat i out =2a (note 2, 3) 1.25 1.4 v max duty cycle (on) min duty cycle (off) dc (note 3) (note 4) 100 0 % current limit i cl peak current (notes 2, 3) 1.8 2.25 3.45 a output=0v (notes 2, 4) -200 a output leakage current i l output=-1v (note 5) -5 ma quiescent current i q (note 4) 5 10 ma standby quiescent current i stby on/off pin=5v (off) (note 5) 70 150 a note 1: the switching frequency is reduced wh en the second stage current limit is activated. 2: no diode, inductor or capac itor connected to output pin. 3: feedback pin removed from output and connected to 0v to force the output transistor switch on. 4: feedback pin removed from output and connected to 12v for the 2.5v 3.3v, 5v, and the adj. version, and 15v for the 12v version, to force the output transistor switch off. 5: v in = 24v
p1596 linear integrated circuit unisonic technologies co., ltd 5 of 7 www.unisonic.com.tw qw-r103-027,h typical application for adjustable output voltage version v out (r 1 /(r 1 + r 2 ))=v ref v out = v ref (1+ r 2 /r 1 ) where v ref =1.23v r 2 =r 1 ((v out / v ref )-1) for fixed output voltage versions
p1596 linear integrated circuit unisonic technologies co., ltd 6 of 7 www.unisonic.com.tw qw-r103-027,h ? typical characteristics -40 0 3.2 output voltage v. s. temperature (v in =12v, i out =1.5a) 20 -20 40 60 3.3 3.1 80 3 temperature, ta ( ) 3.05 3.15 3.25 3.35 3.4 100 120 140 -50 -10 78 efficiency v.s. temperature (v in =12v, v out =3.3v, i out =1.5a) 10 -30 30 50 80 76 70 74 temperature, ta ( ) 75 77 79 81 82 90 110 130 -50 -25 1.1 saturation voltage v.s. temperature (v cc =12v, v fb =0v, v sd =0) 25 1.3 0.9 50 0.7 temperature, ta ( ) 0.8 1 1.2 1.4 1.5 100 125 -50 -10 switch current limit v.s. temperature (v cc =12v, v fb =0v) 10 -30 30 50 70 temperature, ta ( ) 2 2.5 3 3.5 90 0 75 0.5a 1a 1.5a -50 -10 9 supply current v.s. temperature (v cc =12v, no load, v on/off =0v,(switch on)) 30 11 7 50 5 temperature, ta ( ) 6 8 10 12 13 90 110 -50 -10 supply current v. s. temperature (v cc =12v, no load, v on/off =5v,(switch off)) 10 -30 30 50 70 temperature, ta ( ) 30 35 40 50 90 -30 10 70 55 45 110 130 150 60 switch off switch on 130
p1596 linear integrated circuit unisonic technologies co., ltd 7 of 7 www.unisonic.com.tw qw-r103-027,h ? typical characteristics (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.
|
