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unisonic technologies co., ltd p3596 linear integrated circuit www.unisonic.com.tw 1 of 8 copyright ? 2008 unisonic technologies co., ltd qw-r103-023,e 150khz, 3a pwm step-down dc/dc converter ? description the utc p3596 series is a step-down switching regulator able to provide 3a output current. the availa ble output voltages are 1.5v , 2.5v, 3.3v, 5v, 12v, and an adjustable output version. ? features *output load current: 3a *adjustable version output voltage range, 1.23v ~ 32v4% *operating voltage can be up to 35v *low power standby mode *high efficiency *internal current and thermal limit to-220b 1 to-220-5 1 1 to-263-5 *pb-free plating product number:p3596l ? ordering information ordering number normal lead free plating package packing p3596-xx-ta5-t p3596l-xx-ta5-t to-220-5 tube p3596-xx-tb5-t p3596l-xx-tb5-t to-220b tube p3596-xx-tq5-r p3596l-xx-tq5-r to-263-5 tape reel p3596-xx-tq5-t p3596l-xx-tq5-t to-263-5 tube note: xx: output voltage, re fer to marking information.
p3596 linear integrated circuit unisonic technologies co., ltd 2 of 8 www.unisonic.com.tw qw-r103-023,e ? pin description ? marking information package voltage code marking to-220-5 to-220b to-263-5 15:1.5v 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 thermal resistance junction to ambient to-220b to-220-5 to-263-5 ja 45 45 55
/w pin no. pin name description 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
p3596 linear integrated circuit unisonic technologies co., ltd 3 of 8 www.unisonic.com.tw qw-r103-023,e ? block diagram
p3596 linear integrated circuit unisonic technologies co., ltd 4 of 8 www.unisonic.com.tw qw-r103-023,e ? absolute maximum ratings parameter symbol ratings unit maximum supply voltage v cc 40 v operating voltage v opr 4.5 ~ 35 v on/off pin input voltage v on/off -0.3 ~ +20 v feedback pin voltage v fb -0.3 ~ +20 v output voltage to gr ound (steady state) v out -1 v power dissipation p d internally limited mw maximum junction temperature t j +150
temperature range t opr -40 ~ +125
storage temperature range t stg -65 ~ +150
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 (t + =25
, v in =12v for the 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 1.5v 2.8v v in 35v, 0.2a i load 3a 1.44 1.5 1.56 v 2.5v 3.8v v in 35v, 0.2a i load 3a 2.4 2.5 2.6 v 3.3v 4.75v v in 35v, 0.2a i load 3a 3.168 3.3 3.432 v 5.0v 7v v in 35v, 0.2a i load 3a 4.8 5.0 5.2 v output voltage 12v v out 15v v in 35v, 0.2a i load 3a 11.52 12.0 12.48 v 1.5v v in =12v, i load =3a 73 % 2.5v v in =12v, i load =3a 73 % 3.3v v in =12v, i load =3a 73 % 5.0v v in =12v, i load =3a 80 % efficiency 12v v in =24v, i load =3a 90 % utc p3596-adj feedback voltage v fb 4.5v v in 35v, 0.2a i load 3a v out programmed for 3v 1.193 1.230 1.267 v efficiency v in =12v, v out =3v, i load =3a 73 % 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 =3a (note 2, 3) 1.16 1.4 v min on (note 3) 100 duty cycle max dc off(note 4) 0 % current limit i limit peak current (notes 2, 3) 3.6 4.5 6.9 a output=0v (notes 2, 4) 50 a output leakage current i leak output=-1v, v in = 40v 2 30 ma quiescent current i q (note 4) 5 10 ma standby quiescent current i stby on/off pin=5v (off), v in = 40v 80 200 a on/off control low v ih regulator on 0.6 1.3 on/off pin logic input threshold voltage high v il regulator off 2.0 v i h v logic =2.5v (regulator off) 5 15 a on/off pin input current i l v logic =0.5v (regulator on) 0.02 5 a note: 1.the switching frequency is reduced when t he 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 15v for the 12v version, and 12v for others to force the output transistor switch off.
p3596 linear integrated circuit unisonic technologies co., ltd 5 of 8 www.unisonic.com.tw qw-r103-023,e ? typical application for fixed versions note: the dc input would be 15v for 12v version. for adjustable version utc p3596- adj 1 +v in unregulated dc input 3 5 gnd on/off 2 output keep feedback wiring away from inductor flux regulated output l o a d c out + + c in + 4 fb locate the programming resistors near the feedback pin using short leads heavy lines must be kept short and use ground plane construction for best results d1 l1 c ff r2 r1 1k where v ref = 1.23v
p3596 linear integrated circuit unisonic technologies co., ltd 6 of 8 www.unisonic.com.tw qw-r103-023,e ? typical characteristics input voltage (v) 4.85 4.90 4.95 5.00 5.05 5.10 5.15 output voltage (v) fig. 2 line regulation 05 10 15 20 25 30 35 40 125 v out =5v, i load =100ma normalized at t j =25 100 input voltage (v) 60 65 70 75 80 85 90 3a load efficiency (%) fig. 3 efficiency 051015 20 25 30 35 40 3.3v 5.0v 0.5 1 2 3 switch current(a) 0.60 0.80 1.00 1.20 1.40 1.60 0 saturation voltage (v) fig. 4 switch saturation voltage 1 : -40 2 : 25 3 : 125 1 2 3 -25 0 25 50 75 100 junction temperature ( ) 3.50 3.75 4.00 4.25 4.50 4.75 5.00 -50 switch current limit (a) fig. 5 switch current limit 125 -25 0 25 50 75 100 125 0.00 5.00 10.0 15.0 20.0 25.0 30.0 -50 supply current (ma) fig. 6 operating quiescent current junction temperature ( ) 4.5v< v in < 40v i switch =0 switch on switch off v in =12v, v out =5v -25 0 25 50 75 4.85 4.90 4.95 5.00 5.05 5.10 5.15 -50 v in =20v, i load =3a normali ed at t j =25 fig. 1 normalized output voltage output voltage (v) junction temperature ( )
p3596 linear integrated circuit unisonic technologies co., ltd 7 of 8 www.unisonic.com.tw qw-r103-023,e ? typical characteristics (cont.) 00 40 80 120 160 200 supply voltage (v) v on/off =5v 1 : -40 2 : 25 3 : 125 current (ua) fig. 7 shutdown quiescent current 0 5 10 15 20 25 30 35 3 1 2 40 100 125 0.0 1.0 2.0 3.0 4.0 5.0 6.0 -50 -25 0 25 50 75 junction temperature ( ) v out =1.23v i load =200ma supply voltage (v) fig. 8 minimum operating supply voltage -25 0 25 50 75 100 125 junction temperature ( ) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 -50 threshold voltage (v) fig. 9 on/off threshold voltage off on 10 15 20 22 23 24 25 on/off pin voltage (v) 0.0 30 60 90 120 150 180 0.0 current (ua) fig. 10 on/off pin current (sinking) v in =40v -40 < t j <125 -25 0 25 50 75 100 125 0.0 50 100 150 200 250 300 -50 v in =20v, i load =3a normalized at t j =25 frequency (khz) fig. 11 switch frequency 0.0 10 20 30 40 50 60 junction temperature ( ) -25 0 25 50 75 100 125 junction temperature ( ) -50 adjustable version only bias current (na) fig. 12 feedback pin bias current
p3596 linear integrated circuit unisonic technologies co., ltd 8 of 8 www.unisonic.com.tw qw-r103-023,e 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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