Global Mixed-mode Technology Inc.
G525A
USB High-Side Power Switch Advance Information
Features
Typical 110mΩ, Low MOSFET on resistance, at
Ω
5.0V
1A minimum continuous load current
3.0V to 5.5V operating range
100 µA typical on-state supply current
1 µA 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-
high or active-low version
UL Approved_#E232223
General Description
The G525A is an integrated high-side power switch
optimized for self-powered and bus-powered Universal
Serial Bus (USB) applications.
The G525A satisfies the USB standards. The switch's
low on-resistance meets USB voltage drop require-
ments. When the output load exceeds current-limit
threshold, G525A switches into constant mode and
limit the output current to a safe level, which is typically
1.4A, well below the UL 25VA safety requirements. An
open-drain flag output is also available to indicate fault
conditions to the local USB controller. Soft start elimi-
nates the momentary 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 pre-
vent catastrophic switch failure caused by increasing
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.
The G525A is a UL recognized component and is
available in active-high and active-low versions in 8-pin
SOP packages.
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
Ordering Information
PART
G525A1
G525A2
ENABLE
Active High
Active Low
TEMP. RANGE
-40°C to
＋85°C
-40°C to
＋85°C
PACKAGE
8-Pin SOP
8-Pin SOP
Pin Configuration
G525A
EN
FLG
GND
NC
1
2
3
4
8
7
6
5
OUT
IN
OUT
NC
3 (GND)
(EN)1
(FLG)2
Gate
Control
7 (IN)
G525A
6,8 (OUT)
8 Pin SOP
8 Pin Function Block
R
UL Recognized Component
Ver: 1.2
Nov 11, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
1
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
)….………....-65°C to +150°C
Lead Temperature (Soldering 5 sec.)……………260°C
ESD protection*………………..…………….……….2kV
G525A
Operating Ratings
Supply Voltage (V
IN
).……………………….+3V to +5.5V
Operating Temperature (T
A
)…………….-40°C to +85°C
Thermal Resistance
SOIC (θ
JA
)……………………………………160°C/W
Electrical Characteristics
(V
IN
=+5V; T
A
=25°C.)
PARAMETER
IN Supply Current
EN Enable Threshold
EN Input Current
EN Input Capacitance
Switch Resistance
OUT Turn-On Delay
OUT Turn-On Rise Time
OUT Turn-Off Delay
OUT Turn-Off Fall Time
OUT Leakage Current
Short Circuit Current Limit
Circuit Limit Threshold
Overtemperature Shutdown
Threshold
FLG Output Resistance
FLG Off Current
UVLO Threshold
V
IN
= 5V , I
OUT
= 500mA
V
IN
= 3.3V , I
OUT
= 500mA
R
L
= 10Ω
R
L
= 10Ω, CL=100µF
R
L
= 10Ω
R
L
= 10Ω
Enable into load
Ramped load applied to enabled output
T
J
increasing
T
J
decreasing
V
IN
= 5V, I
L
=10mA
V
IN
= 3.3V, I
L
=10mA
V
FLAG
= 5V
V
IN
= increasing
V
IN
= decreasing
1.0
2.0
CONDITION
**switch
off, OUT = open
**switch
on, OUT = open
low to high transition
high to low transition **
V
EN
= V
OH(min)
= 2.5V
V
EN
= V
OL(max)
= 1.0V
MIN
TYP
1
100
MAX
5
160
2.5
1
1
140
180
UNITS
µA
µA
V
V
µA
µA
pF
mΩ
mΩ
ms
ms
µs
µs
µA
A
A
°C
°C
Ω
Ω
µA
V
V
0.8
0.01
0.01
1
110
130
0.03
0.5
1
1
1
1.4
2.7
135
125
10
15
0.01
2.5
2.3
20
20
10
2.0
3.5
25
40
1
*
Devices are ESD protected, however, handling precautions are recommended.
**
For the G525A1, off is
≤
1.0 and on is
≥2.5V.
For the G525A2, off is
≥
2.5V and on is
≤
1.0V. The enable input,
CTRL, has approximately 200mV of hysteresis.
Pin Description
PIN NUMBER
1
2
3
4,5
7
6,8
PIN NAME
EN
FLG
GND
NC
IN
OUT
PIN FUNCTION
Enable (input):
Logic level enable input. High input >2.4V typical.
Low input <2.2V typical (1 for active high, 2 for active low).
Make sure EN never floating.
Open-Drain Fault Flag (Output):
Active-low, open-drain output. Indicates overcurrent,
thermal shutdown and UVLO.
Ground.
Not internally connected.
Input Supply:
Output MOSFET source, which also supplies IC's internal circuitry. Con-
nect to positive supply.
Switch Output:
Output MOSFET drain. Typically connect to switched side of load.
Ver: 1.2
Nov 11, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
2
Global Mixed-mode Technology Inc.
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN= 5V, TA=25°C, G525A1, unless otherwise noted.)
°
G525A
Iout Ramp Chart
Flag Delay After OC
Output Turn-On Delay
Output Turn-Off Delay
Power Up (UVLO)
Power Down (UVLO)
Ver: 1.2
Nov 11, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
3
Global Mixed-mode Technology Inc.
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN= 5V,TA=25°C, G525A1, unless otherwise noted.)
°
G525A
Turn-On Characteristics
Turn-On Characteristics
Turn-On Characteristics
Turn-On Characteristics
Short Circuit Response
(Short Applied to Output)
Ver: 1.2
Nov 11, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
4
Global Mixed-mode Technology Inc.
Typical Applications
V
CC
5.0V
Upstream
V
BUS
100mA max.
V
BUS
D
+
D
－
GND
1µF
10k
100k
G525A
Ferrite
Beads
＋
150 µF
G912
IN
OUT
GND
1 µF
3.3V USB Controller
VIN
ON/OFF
GND
OVERCURRENT
G525A
EN OUT
FLG
IN
GND OUT
NC
NC
V
BUS
D
+
D
－
GND
USB
Port
0.1 µF
Data
Data
Single-Port Self-Powered USB Hub Application
Function Block Diagrams
IN
EN
Clock
Gate Control
BandGap
Reference
Overcurrent
Limiting
CMP
Current
Sense
OUT
FLG
UVLO
GND
Thermal Sense
Functional Description
The G525A1 and G525A2 are high-side 1-channel
switches with active-high and active-low enable inputs,
respectively. Fault conditions turn off or inhibit turn-on
of the output transistors and activate the open-drain
error flag transistors to pull FLG pin to ground.
Input and Output
IN (input) is the power supply connection to the logic
circuitry and the source of the output MOSFET. OUT
(output) is the drain of the output MOSFET. In a typical
application, current flows through the switch from IN to
OUT toward the load. Both OUT pins must be
connected together to the load.
Ver: 1.2
Nov 11, 2002
The output MOSFET and driving circuit are also de-
signed to allow the MOSFET drain to be externally
forced to a higher voltage than the source (V
OUT
> V
IN
)
when the switch is off. In this situation, the G525A
avoids undesirable drain-to-body diode current flow by
connecting the body to the most positive voltage. If
V
OUT
>V
IN
when switch is enabled, current will flow
from V
OUT
to V
IN
.
Thermal Shutdown
Thermal shutdown protects G525A from excessive
power dissipation. If the die temperature exceeds
135°C, the MOSFETS switch is shut off and a fault
flag is activated. 10°C of hystersis prevents the switch
TEL: 886-3-5788833
http://www.gmt.com.tw
5
