unisonic technologies co., ltd us2075c preliminary cmos ic www.unisonic.com.tw 1 of 10 copyright ? 2009 unisonic technologies co., ltd qw-r502-255,b dual-channel power distribution control switch for usb ? description the utc us2075c is a dual channel power switch with independent enable and flag functions, optimized for bus-powered universal serial bus (usb) and self-powered applications. this product satisfies usb voltage drop requirement with soft start, which eliminates the moment ary voltage drop on the upstream port that may occur. in addition, the utc us2075c is equipped with over-temperature and over-current detectors, each flag output is available to indicate fault conditions independently to the usb controller. the utc us2075c is available in active-high versions. ? features * 100 a max operating current * 5 a max standby current * 3.5v ~ 5.5v operating range * two p-channel power mosfet control switch * over-current protection * under-voltage lockout circuit * thermal shutdown circuit * soft-start circuit * flag indicates fault conditions lead-free: us2075cl halogen-free: us2075cg ? ordering information ordering number normal lead free plating halogen free package packing US2075C-S08-R us2075cl-s08-r us2075cg-s08-r sop-8 tape reel
us2075c preliminary cmos ic unisonic technologies co., ltd 2 of 10 www.unisonic.com.tw qw-r502-255,b ? pin configuration utc us2075c ctl1 ctl2 gnd flag2 flag1 out2 out1 in 1 2 3 4 8 7 6 5 ? pin description pin no pin name description 1 ctl1 switch1control input: logic-com patible, active-high. ttl input 2 flag1 fault detection flag 1 (output): active-low. n-ch open-drain. indicates over-current, thermal shutdown, or uvlo conditions 3 flag2 fault detection flag 2 (output): active-low. n-ch open-drain. indicates over-current, thermal shutdown, or uvlo conditions 4 ctl2 switch2 control input: logic-co mpatible, active-high. ttl input 5 out2 switch2 output: drain of mosfet for output. usually, connected to load 6 gnd ground 7 in power input: source of mosfet for output. power supply to internal circuit 8 out1 switch1 output: drain of mosfet for output. usually, connected to load ? truth table (h: high, l: low, on: turn on, off: turn off, x: h or l) ctl1 (in) flag1 (out) out1 (out) ctl2 (in) flag2 (out) out2 (out) operation mode h h on h h on normal operation h h on l h off only out1 is on. l h off h h on only out2 is on. l h off l h off standby mode h l on h h on over current detection only for out1 h h on h l on over current detection only for out2 x l off x l off thermal s hutdown circuit operation x l off x l off under voltag e lockout circuit operation
us2075c preliminary cmos ic unisonic technologies co., ltd 3 of 10 www.unisonic.com.tw qw-r502-255,b ? block diagram current limit current limit gate control gate control uvlo thermal shutdown flag logic flag logic control control gnd flag2 flag1 out2 out1 in ctl1 ctl2 1 6 4 3 5 7 8 2
us2075c preliminary cmos ic unisonic technologies co., ltd 4 of 10 www.unisonic.com.tw qw-r502-255,b ? absolute maximum ratings (t a =25 ) parameter symbol ratings unit input voltage v in -0.3 ~ +6 v flag voltage v flag -0.3 ~ +6 v flag current i flag 50 ma output voltage v out v in +0.3 v output current i out -0.1 ~ +0.5 a control input v ctl -0.3 ~ +6 v total power dissipation p d 300 mw junction temperature t j +150 operating temperature t opr 0 ~ +85 storage temperature t stg -55 ~ +150 note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functiona l device operation is not implied. ? recommended operating range parameter symbol test conditions min typ max unit temperature rising 150 thermal shutdown protection t shdn temperature hysteresis 5 10 ? dc electrical characteristics (v in =+5v, t opr =+25 , unless otherwise specified) parameter symbol test conditions min typ max unit input voltage v in 3.5 5 5.5 v ctl voltage, low v il ctl pin (note) 1.0 v ctl voltage, high v ih ctl pin (note) 2.0 v v in =increasing 2.2 2.5 2.8 v v in =decreasing 2.0 2.3 2.6 v under-voltage lockout v uvlo hysteresis voltage 0.05 0.25 v i sw_on v ctl = v in , v out1 =v out2 =open 100 a supply current i sw_off v ctl = gnd, v out1 =v out2 =open 1 5 a output leakage current i o(leak) v ctl = gnd 10 a flag leakage current i f(leak) v flag =5v 0.1 1 a current limit i limit t a =0~80 0.6 0.9 1.25 a flag output resistance r out i l =10ma 10 20 ? output mosfet on-resistance r on i out =500ma 105 145 m ? note: on is ctl>2.0v and off is ctl<1.0v. ? ac electrical characteristics parameter symbol test conditions min typ max unit output turn-on rise time t r r l =10 ? , per output 2.5 5 8 ms output turn-off fall time t f r l =10 ? , per output 10 s over-current detection delay time t delay 20 s over-current detection output rise time t decr r l =10 ? , per output 2.5 5 8 ms
us2075c preliminary cmos ic unisonic technologies co., ltd 5 of 10 www.unisonic.com.tw qw-r502-255,b ? test circuit 1m s2 utc us2075c ctl1 ctl2 gnd flag2 flag1 out2 out1 in 1m 10k 10k s1 c in c l1 c l2 r l1 r l2 v in v out2 v out1 2 3 1 4 6 5 8 7
us2075c preliminary cmos ic unisonic technologies co., ltd 6 of 10 www.unisonic.com.tw qw-r502-255,b ? timing diagram v ctl v flag v out i out t delay t decr i limit 90%
us2075c preliminary cmos ic unisonic technologies co., ltd 7 of 10 www.unisonic.com.tw qw-r502-255,b ? functional description the utc us2075c is dual p-channel switch with active-low and active-high enable inputs, respectively. fault conditions (such as uvlo, thermal shutdown and over-curr ent) that appear will turn off the power switch, and the flag pin will go low. of course, the two internal flag circuit s also operate respectively. input and output in (input) is the power supply connection to the contro l circuitry and the source of the output mosfet. outx (output) is the connection to the drain of the output mosfet. in a typical application circuit, current flows through the switch from in to outx towards the load. if v out is greater than v in when the switch is enabled, current will flow from outx to in since the mosfet is bi-directional. power on and off the utc us2075c performs a soft-start operation on power applicati on, which is to prevent an over-current or inrush-current from flowing through the switch from in to outx towards to the load, while the high-capacity capacitor is connected to the outx. thermal shutdown the utc us2075c is internally protected against excessive powe r dissipation by thermal shutdown protection circuit. if device junction temperature rise above approximately 150 , both switches are turned off, both fault flag outputs are activated, and they goes low. hysteresis ensures that both switches turned off by thermal shutdown will not be turned on again until the di e temperature is reduced to 145 . when the thermal shutdown circuit is activated, the output pins are in the off status. however, the utc us2075c enters the standby status when ctl pins are all inactive. current limit the current limit circuit is designed to protect the output mosfet, the load and the ic supply from damage caused by excessive currents. the current limit threshold is preset internally, if an over-current is detected, the ic performs a slow-start operation again, it is assumed that output is short circ uit, and flag pin will go low, flag output is available to indicate fault condit ions independently to the usb controller. under-voltage lockout uvlo prevents the output mosf et switch from turning on until input vo ltage exceeds 2.5v (typical). if input voltage drops below 2.3v (typical), uvlo shuts off t he both output mosfet switches and signals the flag. fault flag the fault flag is an output with open- drain of n-channel. the fault flag is pulled down when any of the conditions such as under-voltage, current limit and thermal s hutdown. in a typical application circuit, the falg pin has a pull-up resistor of 10k ? to input voltage.
us2075c preliminary cmos ic unisonic technologies co., ltd 8 of 10 www.unisonic.com.tw qw-r502-255,b ? typical application circuit utc us2075c ctl1 ctl2 gnd flag2 flag1 out2 out1 in 10k 1 f 5v enable disable over current 3.3v 150 f 150 f d+ d- d+ d- gnd v bus d+ d- gnd v bus usb controller usb connector usb connector two usb output ports controllable by usb controller 10k 2 3 1 4 6 5 8 7
us2075c preliminary cmos ic unisonic technologies co., ltd 9 of 10 www.unisonic.com.tw qw-r502-255,b ? typical characteristics supply current, i sw (a) output on-resistance, r on (m ? ) ctl-pin threshold voltage vs. input voltage 1 0.98 0.96 0.94 0.92 0.9 0.88 0.86 4 55.5 4.5 6 input voltage, v in (v) over-current limit, i limit (a) 1.65 1.6 1.55 1.5 1.45 1.4 4 55.5 4.5 6 input voltage, v in (v) ctl-pin threshold voltage (v) v ih v il over-current limit vs. input voltage turn-on response (v in vs. v out ) v in (5v/div) (2ms/div) t v in =5v, c in =1f, c out =1f, r l =10 t v in =5v, c in =1f, c out =1f, r l =10 turn-off response (v in vs. v out ) v out (2v/div) (10ms/div) v in (5v/div) v out (2v/div)
us2075c preliminary cmos ic unisonic technologies co., ltd 10 of 10 www.unisonic.com.tw qw-r502-255,b ? 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.
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