unisonic technologies co., ltd US2005 preliminary cmos ic www.unisonic.com.tw 1 of 5 copyright ? 2013 unisonic technologies co., ltd qw-r502-a04.a fixed current limit power distribution switch ? description utc US2005 is a low voltage cost-effective high-side power switch with current limiting function. it is particularly suitable for general purpose power distribution and control in digital televisions (dtv), printers, set top boxes (stb), pcs, pdas, and other peripheral devices. utc US2005 contains a charge pump circuitry to drive the internal mosfet switch and also incorporate such protection circuits: soft-start circuit protect these devices from being damaged by limiting inrush current during plug-in; thermal shutdown circuit is used to prevent catastrophic switch failure from high-current loads. uvlo is used to ensure that the device remains off unl ess there is a valid input voltage present. a flag output is designed to indi cate fault conditions to the local usb controller. lower quiescent current as 80 a making this device ideal for portable battery-operated equipment. utc US2005 allows momentary high current surges to pass unrestricted without sacrificing over all system safety. it also allows output slew rate limiting by an external capacitor. ? features * built-in 80m ? n-mosfet * open-drain fault flag output to indicate fault conditions * input voltage varies from 2.5v to 5.5v * 80 a low quiescent current * current limit values of 0.5a, 0.8a, and 1.2a * automatic-on output after fault * thermal protection * under voltage lock-out (uvlo) ? ordering information ordering number package packing lead free halogen free US2005l-ag6-r US2005g-ag6-r sot-26 tape reel note: xx: output voltage, refer to marki ng information. ? marking information
US2005 preliminary cmos ic unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r502-a04.a ? pin configuration ? pin description pin no. pin name description 1 in supply input. this pin provides power to both the output switch and the utc US2005?s internal control circuitry. 2 gnd ground. 3 en switch enable (input): acti ve-high (-1) or active-low (-2) 4 flg fault status. a logic low on this pin indicate s the utc US2005 is in current limiting, or has been shut down by the thermal protecti on circuit. this is an ?open drain? output allowing logical or? ing of multiple utc US2005s. 5 cslew slew rate control. adding a small value capacitor between this pin and vin slows turn-on of the power fet. 6 out switch output. the load being driven by utc US2005 is connected to this pin. ? block diagram cslew en slew rate control bias thermal protection oscillator charge pump uvlo gate control current limiting output voltage detection delay in out flg gnd
US2005 preliminary cmos ic unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r502-a04.a ? absolute maximum rating (t a =25c, unless otherwise specified) (note 1) parameter symbol ratings unit supply voltage v in 6 v enable input voltage v en 5.5 v flag voltage v flg 5.5 v power dissipation (t a =25c) p d 0.4 w junction temperature t j 150 c storage temperature t stg -65~150 c note: absolute maximum ra tings 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 package thermal resistance ja 230 c/w ? recommended operating conditions (note 2) parameter symbol ratings unit supply input voltage v in 2.5~5.5 v enable input voltage v i ( en ) 0~5.5 v continuous output current range 0~2.1 a ambient operating temperature t a -40~+85 c ? electrical characteristics (v in =5v, t ambient =25c unless specified otherwise. bo ld indicates -40c~+85c limits.) parameter symbol test conditions min typ max unit switch input voltage v in 2.5 5.5 v internal supply current i in switch=off, enable=0v 1 5 a internal supply current i in switch=on, i out =0, enable=1.5v 80 300 a output leakage current i leak v in =5v, v out =0v, enable=0 12 100 a power switch resistance r ds(on) v in =5v, i out =100ma 70 100 m ? 125 m ? current limit: ?0.5 i limit v out =0.8v in to v out =1v 0.5 0.7 0.9 a current limit: ?0.8 i limit v out =0.8v in to v out =1v 0.8 1.1 1.5 a current limit: ?1.2 i limit v out =0.8v in to v out =1v 1.2 1.6 2.1 a secondary current limit (kickstart) i limit_2nd v in =2.7v 2.2 4 6 a under voltage lock out threshold uvlo threshold v in rising 2.0 2.25 25 v v in falling 1.9 2.15 2.4 v enable input voltage v en v il (max.) 0.5 v v ih (min) 1.5 v enable input current i en v en =0v~5.0v 1 5 a fault status output voltage v fault i ol =10ma 0.25 0.4 v over-temperature threshold ot threshold t j increasing 145 c t j decreasing 135
US2005 preliminary cmos ic unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r502-a04.a ? ac characteristics parameter symbol test conditions min typ max unit output turn-on rise time t rise r l =10 ? , c load =1f, v out =10%~90% 500 1000 1500 s delay before asserting or releasing flg t d_fault time from current limiting to flg state change. utc US2005 20 32 49 ms output turn-on delay t on _ dly r l =43 ? , c l =120f, v en =50%~v out =90% 1000 1500 s output turn-off delay t off _ dly r l =43 ? , c l =120f, v en =50%~v out =90% 700 s notes: 1. exceeding the absolute ma ximum rating may damage the device. 2. the device is not guaranteed to function outside its operating rating.
US2005 preliminary cmos ic unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r502-a04.a ? typical application circuit utc US2005 5v supply + in cslew en out gnd flg usb controller usb port v bus d+/d- + 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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