unisonic technologies co., ltd p1696 linear integrated circuit www.unisonic.com.tw 1 of 7 copyright ? 2011 unisonic technologies co., ltd qw-r103-035,g 200khz, 2a pwm step-down dc/dc converter ? description the utc p1696 series is a step-down switching regulator able to provide 2a output current. the av ailable output voltages are 2.5v 3.3v, 5v, 12v, and an adjustable output version. ? features *output load current: 2a *adjustable version output vo ltage range, 1.23v ~ 17.5v4% *operating voltage can be up to 24v *low power standby mode *high efficiency *internal ocp and otp ? ordering information ordering number package packing lead free halogen free P1696L-XX-S08-R p1696g-xx-s08-r sop-8 tape reel p1696l-xx-sh2-r p1696g-xx-sh2-r hsop-8 tape reel
p1696 linear integrated circuit unisonic technologies co., ltd 2 of 7 www.unisonic.com.tw qw-r103-035,g ? pin configuration (hsop-8/sop8) ? pin description (hsop-8/sop8) pin no. pin name description 1 v in power input 2 output switching 3 fb feedback voltage 4 sd enable input 5,6,7,8 gnd ground
p1696 linear integrated circuit unisonic technologies co., ltd 3 of 7 www.unisonic.com.tw qw-r103-035,g ? block diagram output 2a switch gnd fb sd start up v in comp osc vref ocp driver otp reference ea
p1696 linear integrated circuit unisonic technologies co., ltd 4 of 7 www.unisonic.com.tw qw-r103-035,g ? absolute maximum ratings parameter symbol ratings unit maximum supply voltage v cc 28 v operating voltage v opr 4.5 ~ 24 v on/off pin input voltage v on/off -0.3 ~ +12 v feedback pin voltage v fb -0.3 ~ +12 v output voltage to gr ound (steady state) v out -1 v power dissipation p d internally limited mw junction temperature t j +150 operating temperature t opr -40 ~ +125 storage temperature t stg -40 ~ +150 note: absolute maximum ratings are those values be yond which the device could be permanently damaged. absolute maximum ratings are stress ratings only 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 output voltage 2.5v v out 5.0v Q v in Q 24v, 0.2a Q i load Q 2a 2.4 2.5 2.6 v 3.3v 6.0v Q v in Q 24v, 0.2a Q i load Q 2a 3.168 3.3 3.432 v 5.0v 7.5v Q v in Q 24v, 0.2a Q i load Q 2a 4.8 5.0 5.2 v 12v 15v Q v in Q 24v, 0.2a Q i load Q 2a 11.52 12.0 12.48 v efficiency 2.5v v in =12v, i load =2a 73 % 3.3v v in =12v, i load =2a 75 % 5.0v v in =12v, i load =2a 80 % 12v v in =24v, i load =2a 80 % utc p1696-adj feedback voltage vfb 4.5v Q v in Q 24v, 0.2a Q i load Q 2a v out programmed for 3v 1.19 1.230 1.267 v efficiency v in =12v, v out =3v, i load =2a 75 % all output voltage feedback bias current i bias adjustable version only, v fb =1.3v 10 50 na oscillator frequency f osc (note 1) 170 200 230 khz saturation voltage v sat i out =2a (note 2, 3) 1.16 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) 2.5 a output leakage current i l output=0v (notes 2, 4) 50 a output=-1v (note 5) 2 30 ma quiescent current i q (note 4) 5 10 ma standby quiescent current i stby on/off pin=5v (off) (note 5) 80 200 a on/off control on /off pin logic input threshold voltag v ih low (regulator on) 1.3 v v il high (regulator off) 1.3 v on /off pin input current i h vlogic=2.5v (regulator off) 5 15 a i l vlogic=0.5v (regulator on) 0.02 5 a note 1: the switching frequency is reduced w hen 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
p1696 linear integrated circuit unisonic technologies co., ltd 5 of 7 www.unisonic.com.tw qw-r103-035,g ? fixed output voltage versions 5.0v/2a l 33 h output gnd utc p1696g -5.0v 1 4 2 3 5,6,7,8 v in fb + + v in sd c in 330 f c out 470 f ? adjustable output voltage versions note:1. fb out v ) r r ( v 2 1 1 + = 2. tested under typical application condition: c in l c out c f 330 f 33 h 470 f - 330 f 33 h 220 f v in <17v - v in 17v 220pf(option)
p1696 linear integrated circuit unisonic technologies co., ltd 6 of 7 www.unisonic.com.tw qw-r103-035,g ? typical characteristics input voltage (v) 4.85 4.90 4.95 5.00 5.05 5.10 5.15 output voltage (v) line regulation 05 10 15 20 25 30 125 v out =5v, i load =100ma normalized at t j =25 100 input voltage (v) 60 65 70 75 80 85 90 2a load efficiency (%) efficiency 0 5 10 15 20 25 30 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) switch saturation voltage 1 : -40 2 : 25 3 : 125 1 2 3 -25 0 25 50 75 4.85 4.90 4.95 5.00 5.05 5.10 5.15 -50 v in =24v,l load =2a normalized at t j =25 output voltage (v) junction temperature ( ) normalized output voltage
p1696 linear integrated circuit unisonic technologies co., ltd 7 of 7 www.unisonic.com.tw qw-r103-035,g function description the changes of output load can cause the output voltage changes. the changes can be sensed by fb pin. the output of error amplifier controlling output duty circle makes the output stable. the p1696 incorporates an over current protection internally. once the output is in overcurrent, power transistor must be turned off immediately. in that case, the power transistor will not be damaged by the excessive current. if over-load or short-circuit condition happens , the oscillation frequency will be reduced, which make the power transistor bears less heat, so the power transistor is protected from damage. 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 system s 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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