unisonic technologies co., ltd us201/a/b/c cmos ic www.unisonic.com.tw 1 of 7 copyright ? 2011 unisonic technologies co., ltd qw-r502-302.e high-side power switches with flag ? description the utc us201/a/b/c series are 80m ? high-side power switches. there?s internal single low voltage n-channel mosfet which makes it an ideal for all usb applications. this mosfet should be driven by a charge pump circuitry inside. its switch on resistance is as low as 80m ? which we know specially meets the drop voltage for usb applications. the flag pin can output an open-drain fault flag to next controller. there?re lots internal special ways for protecting the chip?s operation. when in hot-plug events, there?s large current which can create the upstream voltage droop to match the usb?s voltage droop requirements and soft-start for isolating the power source. as soon as the die temper ature is higher than 130 , the internal shutdown circuit will work. only when there?s a normal input voltage in the v in pin, the uvlo (under-voltage lockout, 1.3v /2.5v typ.) can make sure the chip is till in the off state. because of the requirement of usb power the fault current should be ensured less than 0.6a/1.1a (utc us201/a , single port) and 1.3a /1.5a (utc us201b/c , dual ports). ? features * 80m ? (typ) n-channel mosfet * supply current: ? switch on : 25 a(typ) ? switch off : 1 a (typ) * load current 500ma for us201 and 1.0a for us201a/b/c * input voltage from 2v ~ 5.5v * in off-state: output volt age can be higher than input ? ordering information ordering number lead free halogen free package packing us201xxl-af5-r us201xxg-af5-r sot-25 tape reel
us201/a/b/c cmos ic unisonic technologies co., ltd 2 of 7 www.unisonic.com.tw qw-r502-302.e ? marking 321 5 4 us current code logic level enable pin g: halogen free l : lead free ? pin configuration ? pin description pin no pin name description 1 ctl enable input pin, h: high active, l: low active 2 gnd ground 3 flg open-drain fault flag output 4 v in power input voltage 5 v out output voltage
us201/a/b/c cmos ic unisonic technologies co., ltd 3 of 7 www.unisonic.com.tw qw-r502-302.e ? block diagram
us201/a/b/c cmos ic unisonic technologies co., ltd 4 of 7 www.unisonic.com.tw qw-r502-302.e ? absolute maximum rating (ta=25 , unless otherwise specified) parameter symbol ratings unit 6.5 v supply voltage v cc +2 ~ +5.5 (note 2) v -0.3~ +6.5 v ctl v ctl 0 ~ +5.5 (note 2) v input/output pins flg flg v 6.5 v power dissipation (ta=25 ) p d 0.25 w 150 junction temperature t j -20 ~ +100 (note 2) storage temperature t stg -65 ~ +150 note: 1. 2. absolute maximum ratings are those values beyo nd which the device could be permanently damaged. absolute maximum ratings are stress ratings only an d functional device operat ion is not implied. the device is not guaranteed to function w hen it?s beyond its operating conditions. ? thermal data parameter symbol ratings unit junction to ambient ja 250 /w
us201/a/b/c cmos ic unisonic technologies co., ltd 5 of 7 www.unisonic.com.tw qw-r502-302.e ? electrical characteristics parameter symbol test conditions min typ max unit enable input low v il v in =2v~5.5v, switch off 0.8 v ctl threshold high v ih v in =2v~5.5v, switch on 2.0 v ctl input current i i(ctl) v ctl =0v~5.5v 0.01 a under voltage lock us201/ us201a 1.3 v under-voltage lockout v uvlo v in increasing us201b/ us201c 2.5 under-voltage hysteresis ? v uvlo v in decreasing 0.1 v supply current i sw(on) switch on, v out =open 25 45 a supply current i sw(off) switch off, v out =open 0.1 1 a output leakage current i o(leak) v ctl =0v, r load =0 ? 0.5 10 a current limit us201 0.6 0.8 1.1 a us201a 1.1 1.5 1.9 a us201b 1.3 1.7 2.1 a current limit i limit us201c 1.5 2.0 2.4 a us201 0.8 a us201a 1.0 a us201b 1.0 a short circuit fold-back current i sc ( fb ) v out =0v, measured prior to thermal shutdown us201c 1.3 a power switch i out = 500ma us201 80 110 m ? switch on resistance r ds(on) i out =1.0a us201a/b/c 80 110 m ? output turn-on rise time t on ( rise ) 10% ~ 90% of v out rising 400 s over current flag flag off current (off) flg i flg v=5v 0.01 1 a flag output resistance flg r i sink =1ma 20 400 ? flag delay time t d from fault condition to flg assertion 2 10 15 ms thermal shutdown thermal shutdown protection t sd 130 thermal shutdown hysteresis ? t sd 20
us201/a/b/c cmos ic unisonic technologies co., ltd 6 of 7 www.unisonic.com.tw qw-r502-302.e ? test circuit v in ctl gnd v out flg utc us201/a/b/c chip enable a v in c i r fg v flg s1 i out c o r l i l v out turn-on & off response, flag response v in v ctl v in ctl gnd v out flg utc us201/a/b/c c i r fg v flg c o r l i l v out uvlo at rising & falling v in v in ctl gnd v out flg utc us201/a/b/c c i r fg v flg c o r l i l v out s2 a i out s3 current limit vs. input voltage, inrush current response, current limit transient response
us201/a/b/c cmos ic unisonic technologies co., ltd 7 of 7 www.unisonic.com.tw qw-r502-302.e ? typical application circuit supply voltage 5v ferrite beades 1f 10f 150f v bus d+ d- gnd data v in ctl gnd v out flg utc us201/a/b/c chip enable r fg pull-up resistor (10k ~ 100k) over - current flag transient filtering usb controller 0.1f 10k note. a low-esr 150 f aluminum electrolytic or tantalum between v out and gnd is strongly recommended to meet the 330mv maximum droop requirement in the hub v bus . 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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