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Ver: 1.2
May 17, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
1
G528/G528A
Global Mixed-mode Technology Inc.
USB High-Side Power Switch Advance Information
Features
Typical 110m
, Low MOSFET on resistance, at
5.0V
3.0V to 5.5V operating range
100 A typical on-state supply current
1A typical standby supply current
Output can be forced higher than input when
operating in off state.
1.4A Typical current limit
Thermal shutdown protection
2.4V typical under-voltage lockout (UVLO)
Open-drain fault flag pin
Slow turn-on (soft-start) and fast turnoff
Logic level enable pin, available with active-low
version (G528), or available with active-high
version (G528A)
UL Approved_#E232223
Applications
High-side power protection switch
USB power management
USB host and self-powered hubs
USB Bus-powered hubs
Hot plug-in power supplies
Battery-charger circuits
General Description
The G528/G528A is an integrated high-side power
switch optimized for self-powered and bus-powered
Universal Serial Bus (USB) applications.
The G528/G528A satisfies the USB standards. The
switch's low on-resistance meets USB voltage drop
requirements. When the output load exceeds cur-
rent-limit threshold, G528/G528A switches into con-
stant-current mode and limit the output current to a
safe level, which is typically 1.4A. An open-drain flag
output is also available to indicate fault conditions to
the local USB controller. Soft start eliminates the mo-
mentary voltage drop on the upstream port that may
occur when the switch is enabled in bus-powered
applications.
Besides, a thermal shutdown circuit is included to
prevent catastrophic switch failure caused by increas-
ing power dissipation when continuous heavy loads or
short circuit occurs. A under-voltage lockout (UVLO)
circuit ensures that the device remains off unless there
is a valid input voltage present, and an enable input
that is compatible with both 3.3V and 5V logic.
Ordering Information
ORDER
NUMBER
ORDER NUMBER
(Pb free)
ENABLE
TEMP.
RANGE
PACKAGE
G528P1U
G528P1Uf
Active Low
-40C to +85C
SOP-8
G528AP1U G528AP1Uf Active
High
-40C to +85C
SOP-8
Note: P1: SOP-8L
U: Tape & Reel
Pin Configuration

1
2
3
4
8
7
6
5
G528/G528A
EN
(EN)
GND
OUT
OUT
SOP-8
OUT
FLG
IN
IN
1
2
3
4
8
7
6
5
G528/G528A
EN
(EN)
GND
OUT
OUT
SOP-8
OUT
FLG
IN
IN
Ver: 1.2
May 17, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
2
G528/G528A
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
Supply Voltage (V
IN
).......................................+6.0V
Fault Flag Voltage (V
FLG
).................................+6.0V
Fault Flag Current (I
FLG
).................................50mA
Output Voltage (V
OUT
)....................................+6.0V
Output Current (I
OUT
)......................Internally Limited
Enable Input (V
EN
)................................-0.3V to 6V
Storage Temperature (T
S
)................-65C to +150C
Reflow Temperature (soldering, 10sec)............260C
ESD protection*..............................................2kV
Operating Ratings
Supply Voltage (V
IN
).............................+3V to +5.5V
Operating Temperature (T
A
)................-40C to +85C
Thermal Resistance
SOIC (
JA
)..........................................160C/W
Electrical Characteristics
(V
IN
=+5V; T
A
=25C.)
PARAMETER CONDITION
MIN
TYP
MAX
UNIT
**switch off, OUT = open
--- 1 5 A
IN Supply Current
**switch on, OUT = open
--- 100 160 A
low to high transition
---
---
2.5
V
EN
Enable Threshold
high to low transition **
0.8
---
---
V
V
EN
= V
OH(min)
= 2.5V
--- 0.01 1 A
EN
Input Current
V
EN
= V
OL(max)
= 1.0V
--- 0.01 1 A
EN
Input Capacitance
--- 1 --- pF
V
IN
= 5V, I
OUT
= 500mA
---
110
140
m
Switch Resistance
V
IN
= 3.3V, I
OUT
= 500mA
---
130
180
m
OUT Turn-On Delay
R
L
= 10
--- 0.03 --- ms
OUT Turn-On Rise Time
R
L
= 10
, C
L
=100F
--- 0.5 --- ms
OUT Turn-Off Delay
R
L
= 10
--- 1 20 s
OUT Turn-Off Fall Time
R
L
= 10
--- 1 20 s
OUT Leakage Current
---
1
10
A
Short Circuit Current Limit
Enable into load
1.0
1.4
2.0
A
Circuit Limit Threshold
Ramped load applied to enabled output
2.0
2.7
3.5
A
T
J
increasing
--- 135 --- C
Overtemperature Shutdown
Threshold
T
J
decreasing
--- 125 --- C
V
IN
= 5V, I
L
=10mA ---
10
25
FLG Output Resistance
V
IN
= 3.3V, I
L
=10mA
---
15
40
FLG Off Current
V
FLAG
= 5V
---
0.01
1
A
V
IN
=
increasing
--- 2.5 --- V
UVLO Threshold
V
IN
= decreasing
---
2.3
---
V
* Devices are ESD protected, however, handling precautions are recommended.
** For the G528/G528A, off is
2.5V and on is
0.8V. The enable input,
EN
has approximately 200mV of hys-
teresis.
Ver: 1.2
May 17, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
3
G528/G528A
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(V
IN
= 5V, T
A
=25
C, G528A, unless otherwise noted.)
Power Up (UVLO)
Power Down (UVLO)
Flag Delay After OC
I
OUT
Ramp Chart
Output Turn-On Delay
Output Turn-Off Delay
Ver: 1.2
May 17, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
4
G528/G528A
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(V
IN
= 5V, T
A
=25
C, G528A, unless otherwise noted.)
Turn-On Characteristics
Short Circuit Response
(Short Applied to Output)
Turn-On Characteristics
Turn-On Characteristics
Turn-On Characteristics
Ver: 1.2
May 17, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
5
G528/G528A
Global Mixed-mode Technology Inc.
Pin Description
PIN
G528 G528A
NAME PIN
FUNCTION
1 1 GND
Ground.
2,3 2,3 IN
Input Supply: Output MOSFET source, which also supplies IC's internal circuitry. Connect to
positive supply.
4 EN
Active-low switch enable input. A logic low turns on the switch.
4 EN
Active-High switch enable input. A logic High turns on the switch.
5 5 FLG
Open-Drain Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent, thermal
shutdown and UVLO.
6,7,8 6,7,8 OUT Switch Output: Output MOSFET drain. Typically connect to switched side of load.

Typical Applications
Single-Port Self-Powered USB Hub Application
Function Block Diagrams
Upstream
V
100mA max.
VBUS
D+
D
GND
Data
GND
IN OUT
3.3 V USB Controller
VIN
ON/OFF
G528
OUT
GND
USB
Port
Data
D+
GND
Ferrite
Beads
GND
150F
G911
EN
0.1F
VCC
V
BUS
100mA max.
D
D
GND
Data
GND
IN OUT
VIN
ON/OFF
OUT
GND
USB
Port
Data
V
BUS
D
-
Ferrite
Beads
1F
GND
150F
1F
EN
0.1F
OC
FLG
5.0V
10K
100K
IN
Upstream
V
100mA max.
VBUS
D+
D
GND
Data
GND
IN OUT
3.3 V USB Controller
VIN
ON/OFF
G528
OUT
GND
USB
Port
Data
D+
GND
Ferrite
Beads
GND
150F
G911
EN
0.1F
VCC
V
BUS
100mA max.
D
D
GND
Data
GND
IN OUT
VIN
ON/OFF
OUT
GND
USB
Port
Data
V
BUS
D
-
Ferrite
Beads
1F
GND
150F
1F
EN
0.1F
OC
FLG
5.0V
10K
100K
IN
Upstream
V
100mA max.
VBUS
D+
D
GND
Data
GND
IN OUT
3.3 V USB Controller
VIN
ON/OFF
G528
OUT
GND
USB
Port
Data
D+
GND
Ferrite
Beads
GND
150F
G911
EN
0.1F
VCC
V
BUS
100mA max.
D
D
GND
Data
GND
IN OUT
VIN
ON/OFF
OUT
GND
USB
Port
Data
V
BUS
D
-
Ferrite
Beads
1F
GND
150F
1F
EN
0.1F
OC
FLG
5.0V
10K
100K
IN
Clock
BandGap
Reference
UVLO
Thermal Sense
Overcurrent
Limiting
Gate Control
Current
Sense
CMP
IN
OUT
FLG
EN
GND
Clock
BandGap
Reference
UVLO
Thermal Sense
Overcurrent
Limiting
Gate Control
Current
Sense
CMP
IN
OUT
FLG
EN
GND