unisonic technologies co., ltd p3586 linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2010 unisonic technologies co., ltd qw-r103-050.a pwm control 3a step-down converter ? description the utc p3586 is a fixed 1.2mhz frequency, voltage mode, pwm controller with an internal power mosfet. it supplies 3a continuous output current over a wi de input supply range with excellent load and line regulation. an internal reference voltage sour ce provides low output voltage down to 0.8v for further applications. a pw m control circuit can provide 0~100% duty ratio. the reliability of utc p3586 achieved by such protection circuits. an uvlo (under voltage lock output) circuit monitors the vcc supply voltage to prevent wrong logic c ontrols. the controller?s oc p (over current protection) circuit monitors the output current by using the voltage drop across the power mosfet?s r ds saving the use of a current sensing resistor. over current protection circuit also monitors t he voltage on fb pin under short-circuit conditions. the utc p3586 is generally applied in portable devices. for maximum flexibility in determining loop dynamic, this device is equipped with compensation pin. in additi on, it is requiring less extern al components for operation due to its configuration. ? features * 3a output current * 1.2mhz frequency * input voltage range: 3.6v to 23v * 10 a shutdown supply current * output voltage varies from 0.8v to vcc * frequency fold back at short circuit * protection circuits: uvlo, thermal shutdown, ocp *low esr output capacito r (multi-layer chip capa citor (mlcc)) application. * halogen free ? ordering information ordering number package packing P3586G-S08-R sop-8 tape reel
p3586 linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r103-050.a ? pin configuration ? pin description pin no. pin name description 1 fb feedback pin-an external resistor divider fr om the output to gnd, tapped to the fb pin sets the output voltage. 2 en regulator on/off control pin. a high input at en turns on the conver ter, and a low input turns it off. 3 comp compensation pin- this node is the output of the error amplifier and the input to pwm comparator. 4 v cc input supply pin. 5, 6 sw power switch output pin 7, 8 v ss gnd pin
p3586 linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r103-050.a ? block diagram reference voltage source and bias current source ea + - pwm + - ocp + - sw v ss v cc 4 en 2 fb 1 1.2mhz oscillator comp 3 + 0.8v current limit pmos s r q 5,6 7,8 uvlo driver short circuit signal short circuit signal otp soft start
p3586 linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r103-050.a ? absolute maximum rating (ta=25c, unless otherwise specified ) parameter symbol ratings unit v cc pin voltage v cc -0.3 ~+23 v feedback pin voltage v fb -0.3 ~ +6 v on/off pin voltage v en - 0.3 ~ v cc +0.3 v switch pin voltage v sw - 0.3 ~ v cc + 0.3 v operating supply voltage v op +3.6 ~ +20 v power dissipation p d internally limited mw operating junction temperature t j -20 ~ +125 c storage temperature t stg -40 ~ +150 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. ? thermal data parameter symbol ratings unit junction to ambient ja 70 /w junction to case jc 25 /w notes: ja is measured with the pcb copper area(need connect to sw pins) of approximately 1 in2(multi-layer) ? electrical characteristics (v in = 12v, ta= 25c, unless otherwise specified.) parameter symbol test conditions min typ max unit feedback voltage v fb i out =0.1a 0.784 0.80 0.816 v feedback bias current i fb(bias) i out =0.1a 0.1 0.5 a switch current i sw pear current, no outside circuit v fb =0.7v force driver on 3.2 4.5 a standby current i stn-by v en =0v no outside circuit v fb =0v force driver on 10 a quiescent current i q v fb =1.2v force driver off 3 5 ma oscillation frequency f osc measure waveform at sw pin 1.0 1.2 1.4 mhz frequency of current limit or short circuit protect f osc1 measure waveform at sw pin 70 90 120 khz line regulation out out v v v cc =5v-20v, i out =0.2a 1 2 % load regulation out out v v i out =0.2a-3a 0.2 0.5 % i sh v en =2.5v(on) 30 a en pin input current i sl v en =0.3v(off) 0 1 a v cc =5v,v fb =0v 110 150 m ? internal mosfet r ds(on) r ds(on) v cc =12v,v fb =0v 70 100 m ? v sh high(regulator on) 2.0 v en pin logic input threshold voltage v sl low(regulator off) 0.8 v thermal shutdown temp tsd 160 c efficiency effi. v in = 12v, v out = 5v, i out = 3a 88 % soft start time t ss 0.3 2 5 ms
p3586 linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r103-050.a ? typical application circuit fb en comp vcc sw sw vss vss 1 2 3 4 8 7 6 5 vcc+12v c2 22uf (mlcc) c3 0.22f (option) on/off r4 100k c6 0.1f (option) r3 c7 d1 d1n5822 r2 1.3k r1 6.8k 12 l1 10h c1 0.33nf c4 22f (mlcc) v out =5v/3a utc p3586 15k 10nf c8 51pf notes: ? ? ? ? ? ? + = 2 2 1 r r r vfb v out (c2 can choose 220uf low esr al cap or 22uf mlcc cap)
p3586 linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r103-050.a ? typical characteristics sw output voltage (mv) sw 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.
|
