G557 Global Mixed-mode Technology Inc. Power Distribution Switch Features General Description The G557 is an integrated power switch for self-powered and bus-powered Universal Serial Bus (USB) applications. G557A, G557B, G557C are 70mΩ RDS(ON). 70mΩ High-Side MOSFET (G557A,G557B,G557C) Available with 3 Versions of Current Limits with Foldback Operating Range:2.7V to 5.5V 1.5mS Typical Rise Time Fast Overcurrent Response - 3µS (TYPICAL) Under voltage Lockout 100µA Quiescent Supply Current 1µA Maximum Shutdown Supply Current Logic Level Enable Pin, Available with Active-High or Active-Low Version No Reverse Current when Power Off Deglitched Open-Drain Over-Current Flag Several Protection features include current limiting with foldback, and thermal shutdown to prevent catastrophic switch failure caused by increasing power dissipation when continuous heavy loads or short circuit occurs. A built-in 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. OC is open-drain output report over-current or over-temperature event and has typical 9ms deglitch timeout period. Output ( OC ) With Output Shutdown Pull-low Resister SOP-8 ,MSOP-8,TDFN3X3-8 Packages Applications 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 Pin Configuration Typical Application Circuit G557 G557 GND IN IN EN (EN) 8 1 7 2 3 6 5 4 G557 Power Supply 2.7V to 5.5V OUT OUT OUT* GND 1 IN 2 IN 3 EN (EN) OC Thermal Pad 4 8 OUT 7 OUT 6 OUT* 5 OC IN 1µF* OUT Load 0.1µF 22µF OC ON EN(EN) OFF SOP-8/MSOP-8 TDFN3X3-8 Note: Recommend connecting the Thermal Pad to the GND for excellent power dissipation. *Pin#6 should be considered as OUT when circuit design and PCB layout, but it is NC pin actually. *: 1µF of input capacitor is enough in most application cases. If the PCB trace of power rail to IN is long, larger input capacitor is necessary. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.1 Feb 01, 2011 1