unisonic technologies co., ltd us3076-us3376 preliminary cmos ic www.unisonic.com.tw 1 of 8 copyright ? 2011 unisonic technologies co., ltd qw-r502-424.d dual usb high-side power switch ? description the utc us3076-us3376 is an integrated dual channel for usb high-side power 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 87m ? . oc which is open-drain output report over-cu rrent or over-temperature event, has deglitch timeout period typically 9ms. the utc us3076-us3376 incorporates some protection circuits, such as current limiting circuit with foldback function, thermal shutdown circuit which is designed to prevent catastrophic switch failure due to increasing power dissipation when continuous heavy loads or short circuit occurs. a built-in charge pum p is used to drive the n-channel mosfet that is free of parasitic body diode to eliminate any reversed current flow across the swit ch when it is powered off. the utc us3076-us3376 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, and battery-charger circuits. ? features * operating on the ran ge of 2.7v to 5.5v * high-side mosfet with 87m ? 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) * shutdown supply current: 1 a (max) * 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 us3x76xl-s08-r us3x76xg-s08-r sop-8 tape reel us3x76xl-s08-t us3x76xg-s08-t sop-8 tube us3x76xl-sm1-r us3x76xg-sm1-r msop-8 tape reel us3x76xl-sm1-t US3X76XG-SM1-T msop-8 tube
us3076-us3376 preliminary cmos ic unisonic technologies co., ltd 2 of 8 www.unisonic.com.tw qw-r502-424.d ? pin configuration 1 2 3 4 5 6 7 8 out1 out2 oc2 oc1 gnd in en1(en1) en2(en2) ? pin description pin no. pin name description 1 gnd ground 2 in input supply: output mosfet drain, which also supplies ic's internal circuitry. connect to positive supply. 3 en1(en1) enable: logic level enable input of switch 1. make sure en pin never floating. 4 en2(en2) enable: logic level enable input of switch 2. make sure en pin never floating. 5 oc2 over-current: open-drain oc output of switch 2. 6 out2 switch output: output mosfet source of switch 2. typically connect to switched side of load. 7 out1 switch output: output mosfet source of switch 1. typically connect to switched side of load. 8 oc1 over-current: open-drain oc output of switch 1.
us3076-us3376 preliminary cmos ic unisonic technologies co., ltd 3 of 8 www.unisonic.com.tw qw-r502-424.d ? block diagram
us3076-us3376 preliminary cmos ic unisonic technologies co., ltd 4 of 8 www.unisonic.com.tw qw-r502-424.d ? 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 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 us3376, i out = 1.5a us3276, i out = 1.0a us3176, i out = 0.5a output mos r ds(on) us3076, i out = 0.3a 87 103 m ? supply current i in 90 150 a output turn-on rising time r l =10 ? , 90% settling 400 s us3376 1.5 2 2.8 a us3276 1.1 1.5 2.1 a us3176 0.7 1 1.7 a current limit threshold i thd(limit) us3076 v out =4v 0.5 0.75 1.4 a us3376 0.2 1.3 1.9 a us3276 0.2 1 1.4 a us3176 0.2 0.67 1 a short-circuit current i sc us3076 v out =0v, 2.7v us3076-us3376 preliminary cmos ic unisonic technologies co., ltd 5 of 8 www.unisonic.com.tw qw-r502-424.d ? test circuit i out c out c l r l i l v out out device under test current probe
us3076-us3376 preliminary cmos ic unisonic technologies co., ltd 6 of 8 www.unisonic.com.tw qw-r502-424.d ? timing diagrams
us3076-us3376 preliminary cmos ic unisonic technologies co., ltd 7 of 8 www.unisonic.com.tw qw-r502-424.d ? typical application circuit power supply 2.7v 5.5v 1 f 0.1 f22 f 22 f 0.1 f load load out2 out1 in oc1 en1(en1) oc2 en1(en1)
us3076-us3376 preliminary cmos ic unisonic technologies co., ltd 8 of 8 www.unisonic.com.tw qw-r502-424.d ? 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. current flows through the swit ch from input to output toward the load in a typical application. both out pins must be connected together 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 off the mosfet switch once the input voltage fall s 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 us3376/ us3276/ us3176/ us3076 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 ov er-current or over-temper ature shutdown condition is encountered after a 9-ms deglitch timeout. the output rema ins asserted until the over cu rrent 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. 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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