ver: 1.5 nov 12, 2009 tel: 886-3-5788833 http://www.gmt.com.tw 1 G553 global mixed-mode technology inc. power distribution switch features ? 125m high-side mosfet ? 450ma typical current limit with foldback ? operating range:2.7v to 5.5v ? under voltage lockout ? 65 a quiescent supply current ? 1 a 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 output ( oc ) ? output shutdown pull-low resister ? turn-on soft start 1.5ms typical rise time ? sop-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 general description the G553 is an integrated 125m power switch for self-powered and bus-powered universal serial bus (usb) applications. several protection features include current limiting with foldback, and thermal shutdown to prevent catas- trophic switch failure caused by increasing power dis- sipation when continuous heavy loads or short circuit occurs. and 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. ordering information order number marking enable current limit temp. range package (green) G553d1p11u G553d1 active high 0.45a -40 c to +85 c sop-8 G553d2p11u G553d2 active low 0.45a -40 c to +85 c sop-8 note: p1: sop-8 1: bonding code u: tape & reel pin configuration typical application circuit 8 6 5 1 2 3 4 gnd sop-8 G553 7 out en (en) out out oc in in 0.1 f 22 f load oc en(en) 1 f power supply 2.7v to 5.5v out in on off G553 * : 1 f 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. * 8 6 5 1 2 3 4 gnd sop-8 G553 7 out en (en) out out oc in in 0.1 f 22 f load oc en(en) 1 f power supply 2.7v to 5.5v out in on off G553 * : 1 f 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. *
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