unisonic technologies co., ltd us3075-us3375 cmos ic www.unisonic.com.tw 1 of 10 copyright ? 2011 unisonic technologies co., ltd qw-r502-423.c power distribution switch ? description the utc us3075-us3375 is a power distribution switch. it particularly designed for self-powered and bus-powered universal serial bus (usb) applications. the r ds(on) of the mosfet switch is as low as 100m ? . oc is open-drain output report over-curr ent or over-temperature event which has deglitch typical 9ms timeout period typically 9ms. the utc us3075-us3375 incorporates protection circuits including current limiting circuit with foldback function, thermal shutdown circuit designed to prevent catastrophic switch failure due to increasing power dissipation when continuous heavy loads or short circuit occurs. besides, a built-i n charge pump is used to drive the n-channel mosfet that is free of parasitic body diode to eliminate any reversed current flow across the switch when it is powered off. the utc us3075-us3375 is applied in high-side power protection switch, usb power management, usb host and self-powered bubs, usb bus-powered hubs, hot plug-in power supplies, battery-charger circuits. sop-8 ? features * operating on the range of 2.7v to 5.5v * high-side mosfet with 100m ? r ds(on) * quiescent supply current: 65 a * available with 4 versions of current limits with foldback * rise time: 400 s (typ.) * uvlo (under voltage lockout) * output shutdown pull-low resister * shutdown supply current: 1 a (max.) * logic level enable pin, available with active-high or active-low version * reverse current is not gene rated when in power off state * deglitched open-drain ov er-current flag output ( oc ) ? ordering information ordering number lead free halogen free package packing us3075xl-s08-r us3075xg-s08-r sop-8 tape reel us3175xl-s08-r us3175xg-s08-r sop-8 tape reel US3275XL-S08-R us3275xg-s08-r sop-8 tape reel us3375xl-s08-r us3375xg-s08-r sop-8 tape reel
us3075-us3375 cmos ic unisonic technologies co., ltd 2 of 10 www.unisonic.com.tw qw-r502-423.c ? pin configuration 1 2 3 4 5 6 7 8 oc gnd in en(en) in out out out ? pin description pin no pin name description 1 gnd ground 2,3 in input supply: output mosfet drain, which also supplies ic's internal circuitry. connect to positive supply. 4 en( en ) enable: logic level enable input. make sure en pin never floating. 5 oc over-current: open-drain oc output. 6,7,8 out switch output: output mosfet source of switch. typically connect to switched side of load.
us3075-us3375 cmos ic unisonic technologies co., ltd 3 of 10 www.unisonic.com.tw qw-r502-423.c ? block diagram
us3075-us3375 cmos ic unisonic technologies co., ltd 4 of 10 www.unisonic.com.tw qw-r502-423.c ? absolute maximum rating parameter symbol ratings unit supply voltage v in 6 v output voltage v out 6 v output current i out internally limited a enable input v en -0.3 ~ 6 v storage temperature t stg -65~ +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. ? operating ratings parameter symbol ratings unit supply voltage v in +3 ~ +5.5 v ambient operating temperature t opr -40~ +85 c ? electrical characteristics (v in =5v, c in =1f, c out =1f, r l =10 ? ,t a =25c, unless otherwise specified) parameter symbol test conditions min typ max unit input voltage v in 2.7 5.5 v us3375, i out =1.5a us3275, i out =1a us3175, i out =0.5a output mos r ds(on) us3075, i out =0.3a 100 115 m ? supply current i in 65 a output turn-on rising time r l =10 ? , 90% settling 400 s us3075 0.5 0.75 1.4 a us3175 0.7 1 1.7 a us3275 1.1 1.5 2.1 a current limit threshold i thd(limit) us3375 v out =4v 1.5 2 2.8 a us3075 0.2 0. 5 0.7 a us3175 0.2 0.67 1 a us3275 0.2 1 1.4 a short-circuit current i sc us3375 v out =0v, 2.7v us3075-us3375 cmos ic unisonic technologies co., ltd 5 of 10 www.unisonic.com.tw qw-r502-423.c ? test circuit i out c out c l r l i l v out out device under test current probe
us3075-us3375 cmos ic unisonic technologies co., ltd 6 of 10 www.unisonic.com.tw qw-r502-423.c ? typical application circuit power supply 2.7v ~ 5.5v 1 f 0.1 f22 f load out in oc en(en) off on
us3075-us3375 cmos ic unisonic technologies co., ltd 7 of 10 www.unisonic.com.tw qw-r502-423.c ? functional description input and output in pin (input) is the power supply connection to the logi c circuitry and the drain of the output mosfet. out pin (output) is the source of the output mosfet. in a typical application, curre nt flows through the switch from input to output toward the load. both out pins must be connected t ogether to the load. thermal shutdown thermal shutdown is designed to prevent this device fr om being damaged due to excessive power dissipation. it is used to turn off the output mosfet when the if the temperature is higher t han135c, 20c of hysteresis prevents the switch turn on until the die temper ature drops to 115c. thermal shutdown circuit functions only when the switch is enabled. under voltage lockout uvlo (under voltage lockout) turns of f the mosfet switch once the input voltage falls below 2.3v (typ.) and if the input voltage exceeds 2.5v (typ.), the switch will be turned on. uvlo det ection functions only when the switch is enabled. current limiting the current limit value is fixed intern ally, typically 2a, 1.5a, 1a, 0.75a for us3375/ us3275/ us3175/ us3075 respectively. there is foldback of current limit when v out is less than 1.5v, there is foldback of current limit. oc function the oc open-drain output is asserted (active low) when an over current or over temperature shutdown condition is encountered after a 9-ms deglitch time out. the output keeps asserted until t he over current or over temperature condition is removed. ? application information supply filtering to avoid supply transients, 1 f bypass capacitor is strongly recommended to located between in to gnd. without a bypass capacitor, an output shor t may cause sufficient ringing on the input (from supply lead inductance) to damage internal control circuitry. input transients value must be not higher than the absolut e maximum supply voltage (v in max = 6v) even for a short duration. en, the enable input the enable pin, en, must be driven logic high or logic low for a clearly defined input. the input is not allowed to float, or unpredictable operation may be occurs. en should not be allowed to go negative with respect to gnd.
us3075-us3375 cmos ic unisonic technologies co., ltd 8 of 10 www.unisonic.com.tw qw-r502-423.c ? typical characteristics (v in = 5v, 3275h, c in =1 f, c out =1 f, v en =0v, t a =25c, unless otherwise specified.) time (400 s/div) 5v 0 v en 0 2v 4v v out turn on delay time and rise time 10v 6v 8v 0 2000 4000 time (1ms/div) 5v 0 v en 0 2v 4v v out turn off delay time and fall time 10v 6v 8v 0 510 v in =5v c l =120 f r l =5 v in =5v c l =120 f r l =5 5v 0 v en 0 5v v oc inrush current with different load capacitance 0 2000 4000 time (400 s/div) i out 0 0.5a 1a 5v 0 v en 0 5v v oc 0 2000 4000 time (400 s/div) i out 0 0.5a 1a c l =10 f inrush current with different load capacitance c l =120 f 10v 10v v in =5v r l =5 v in =5v r l =5 5v 0 v en 0 5v v oc 0 510 time (1ms/div) i out 0 0.5a 1a inrush current with different load capacitance 10v c l =220 f v in =5v r l =5 v in =5v c l =47 f r l =1 thermal shutdown response v en v oc i out v out
us3075-us3375 cmos ic unisonic technologies co., ltd 9 of 10 www.unisonic.com.tw qw-r502-423.c ? typical characteristics (cont.) v in v out v in v out v in i out v en v oc i out v in i out v out v in i out v out v oc
us3075-us3375 cmos ic unisonic technologies co., ltd 10 of 10 www.unisonic.com.tw qw-r502-423.c ? typical characteristics (cont.) v in i out v out v oc 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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