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G528P1U Datasheet(PDF) 7 Page - Global Mixed-mode Technology Inc

Part # G528P1U
Description  USB High-Side Power Switch Advance Information
Download  8 Pages
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Manufacturer  GMT [Global Mixed-mode Technology Inc]
Direct Link  http://www.gmt.com.tw
Logo GMT - Global Mixed-mode Technology Inc

G528P1U Datasheet(HTML) 7 Page - Global Mixed-mode Technology Inc

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Ver: 1.2
May 17, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
7
G528/G528A
Global Mixed-mode Technology Inc.
Figure 2. Soft Start
Figure 3. Inrush Current-Limit Application
EN , the active-low enable Input
EN , with 0.2V hysteresis, must be driven logic high or
logic low for a clearly defined input. Floating the input
may cause unpredictable operation. EN should not
be allowed to go negative with respect to GND.
Soft Start
The G528/G528A is high impedance when off and
slowly becomes a low impedance as it turns on. This
reduces inrush current and related voltage drop that
results from charging a capacitive load, satisfying the
USB voltage drop requirements, for bus-powered
applications as shown in Figure 2.
The soft start circuit shown in Figure 3 can be utilized
to meet USB transient regulation specifications with
large
load
capacitances
(CBULK
>10µF).
The
G528/G528A will provide inrush current limiting for
these applications.
GND
OUT
USB
Function
USB
Controller
V
BUS
Cable
4.7
µF
GND
USB Hub
C
BULK
G528
USB Peripheral
IN
EN
0.1
µF
GND
OUT
USB
Function
USB
Controller
V
BUS
Cable
4.7
µF
GND
USB Hub
C
BULK
G528
USB Peripheral
IN
EN
0.1
µF
USB Host
GND
V
BUS
Cable
Bus Powered Hub
USB
Controller
EN
OUT
C
BULK
0.1
µF
G528
Cable
Downstream USB Device
Capacitive
Load
IN
GND
4.7
µF
USB Host
GND
V
BUS
Cable
Bus Powered Hub
USB
Controller
EN
OUT
C
BULK
0.1
µF
G528
Cable
Downstream USB Device
Capacitive
Load
IN
GND
4.7
µF
FLG
USB Host
GND
V
BUS
Cable
Bus Powered Hub
USB
Controller
EN
OUT
C
BULK
0.1
µF
G528
Cable
Downstream USB Device
Capacitive
Load
IN
GND
4.7
µF
USB Host
GND
V
BUS
Cable
Bus Powered Hub
USB
Controller
EN
OUT
C
BULK
0.1
µF
G528
Cable
Downstream USB Device
Capacitive
Load
IN
GND
4.7
µF
FLG


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