G557 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – Power Distribution Switch

Global Mixed-mode Technology Inc.
Power Distribution Switch
G557
Features
„ 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
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
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 R_DS(ON).
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. 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.
Pin Configuration
Typical Application Circuit
GND 1
IN 2
IN 3
EN (EN) 4
G557
8 OUT
7 OUT
GND 1
IN 2
6 OUT*
IN 3
5 OC
EN (EN) 4
G557
Thermal
Pad
8 OUT
7 OUT
6 OUT*
5 OC
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.
Power Supply
2.7V to 5.5V
G557
IN
1µF^*
OC
OUT
EN(EN)
ON
OFF
0.1µF
Load
22µF
*: 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.
Ver: 0.1
Feb 01, 2011
TEL: [phone]
http://www.gmt.com.tw
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