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Электронный компонент: G525A

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Ver: 1.2
Nov 11, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
1
G525A
Global Mixed-mode Technology Inc.
USB High-Side Power Switch Advance Information
Features
Typical 110m
, Low MOSFET on resistance, at
5.0V
1A minimum continuous load current
3.0V to 5.5V operating range
100 A typical on-state supply current
1 A 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
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 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.
Ordering Information
PART ENABLE TEMP.
RANGE PACKAGE
G525A1 Active
High -40C to 85C
8-Pin SOP
G525A2 Active
Low -40C to 85C
8-Pin SOP
Pin Configuration
G525A
Gate
Control
(EN)1
(FLG)2
6,8 (OUT)
7 (IN)
3 (GND)
8 Pin Function Block
1
2
3
4
8
7
6
5
G525A
EN
FLG
GND
NC
OUT
IN
OUT
NC
8 Pin SOP
G525A
Gate
Control
(EN)1
(FLG)2
6,8 (OUT)
7 (IN)
3 (GND)
8 Pin Function Block
1
2
3
4
8
7
6
5
G525A
EN
FLG
GND
NC
OUT
IN
OUT
NC
8 Pin SOP
R
UL Recognized Component
R
UL Recognized Component
Ver: 1.2
Nov 11, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
2
G525A
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
Lead Temperature (Soldering 5 sec.)...............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
UNITS
**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
, CL=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 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
PIN NAME
PIN FUNCTION
1 EN
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.
2 FLG
Open-Drain Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent,
thermal shutdown and UVLO.
3 GND
Ground.
4,5
NC
Not internally connected.
7 IN
Input Supply: Output MOSFET source, which also supplies IC's internal circuitry. Con-
nect to positive supply.
6,8 OUT
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
3
G525A
Global Mixed-mode Technology Inc.
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN= 5V, TA=25



C, G525A1, unless otherwise noted.)
Power Up (UVLO)
Power Down (UVLO)
Flag Delay After OC
Iout Ramp Chart
Output Turn-On Delay
Output Turn-Off Delay
Ver: 1.2
Nov 11, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
4
G525A
Global Mixed-mode Technology Inc.
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN= 5V,TA=25



C, G525A1, 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
Nov 11, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
5
G525A
Global Mixed-mode Technology Inc.
Typical Applications
Single-Port Self-Powered USB Hub Application

Function Block Diagrams
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.
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
135C, the MOSFETS switch is shut off and a fault
flag is activated. 10C of hystersis prevents the switch
Upstream
V
BUS
100mA max.
V
CC
5.0V
V
BUS
D
+
D
GND
Data
GND
IN
OUT
3.3V USB Controller
VIN
ON/OFF
OVERCURRENT
G525A
EN
OUT
FLG
IN
GND OUT
USB
Port
Data
V
BUS
D
+
D
GND
Ferrite
Beads
10k
100k
1F
NC
GND
0.1 F
150 F
1 F
NC
G912
Upstream
V
BUS
100mA max.
V
CC
5.0V
V
BUS
D
+
D
GND
Data
GND
IN
OUT
3.3V USB Controller
VIN
ON/OFF
OVERCURRENT
G525A
EN
OUT
FLG
IN
GND OUT
USB
Port
Data
V
BUS
D
+
D
GND
Ferrite
Beads
10k
100k
1F
NC
GND
0.1 F
150 F
1 F
NC
G912
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