SmartSwitch
TM
AAT4625
USB Single-Channel Power Switch
Preliminary
Information
4625.2002.1.0.93
1
General Description
The AAT4625
SmartSwitchTM
is
part
of
AnalogicTech's
Application
Specific
Power
MOSFETTM (ASPMTM) product family. It is a 1.0A
Current Limited P-channel, MOSFET power switch
designed for high-side load-switching applications.
This switch operates with inputs ranging from 2.7V
to 5.5V, making it ideal for both 3V and 5V systems.
An integrated current-limiting circuit protects the
input supply against large changes in load current
which may cause the supply to fall out of regulation.
The AAT4625 is also protected from thermal over-
load which limits power dissipation and junction
temperatures. The current limit threshold is factory
programmed at 1.5A, with a maximum of 2.0A. The
quiescent supply current is typically a low 16A. In
shutdown mode, the supply current decreases to
less than 1A.
The AAT4625 is available in 8 pin SOP or TSSOP
and is specified over a -40 to 85C temperature
range.
The AAT4600 Series is a family of adjustable and
fixed SmartSwitchTM products with a range of cur-
rent handling capabilities. Single versions with
adjustable current limit (AAT4601) or fixed current
limit (AAT4625) as well as dual versions with fixed
current limit (AAT4626) are available.
Features
Compliant with USB 1.1 and 2.0 specifications
2.7V to 5.5V Input voltage range
1.0A minimum continuous current
2.0A maximum current limit
60m
typical R
DS(ON)
Low quiescent current
Typically 16A
1A max with Switch off
Thermal shutdown
Fault flag with 10ms blanking
Undervoltage Lockout
Temp range -40 to 85C
UL Approved--File No. E217765
8 pin SOP or TSSOP package
Applications
USB ports and peripherals
Notebook computers
Hot swap supplies
General purpose power switching
UL Recognized Component
Typical Application
120
F
GND
GND
OUTPUT
OUT
OUT
IN
EN (EN)
EN (EN)
0.1
F
V
CC
5.0V
100k
FLG
7
2
1
3
8
6
AAT4625
Pin Descriptions
Pin Configuration
SOP-8
TSSOP-8
(Top View)
(Top View)
1
2
IN
OUT
OUT
NC
EN (EN)
FLG
GND
NC
1
2
3
4
8
7
6
5
1
2
EN (EN)
FLG
GND
NC
OUT
IN
OUT
NC
Pin #
Symbol
Function
1
EN (EN)
Enable Input: Logic-compatible enable input. High input > 2.1V typical. Low
input < 1.9V typical. Active high or active low option available; see Ordering
Information for details.
2
FLG
Fault Flag Output: Active-low, open-drain output. Indicates over current,
UVLO and thermal shutdown.
3
GND
Ground connection
4,5
NC
Not internally connected.
6,8
OUT
Switch Output: These pins are the P-channel MOSFET drain connection.
7
IN
Supply Input: This pin is the P-channel MOSFET source connection. Also
supplies the IC's internal circuitry.
AAT4625
USB Single-Channel Power Switch
2
4625.2002.1.0.93
Absolute Maximum Ratings
(T
A
=25C unless otherwise noted)
Note: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at con-
ditions other than the operating conditions specified is not implied. Only one Absolute Maximum rating should be applied at any one time.
Thermal Information
Note 1: Mounted on an FR4 printed circuit board.
Electrical Characteristics
(V
IN
= 5V, T
A
= -40 to 85C unless otherwise noted. Typical values
are at T
A
=25C; bold values designate full temperature range)
Symbol
Description
Conditions
Min
Typ
Max
Units
V
IN
Operation Voltage
2.7
5.5
V
I
Q
Quiescent Current
V
IN
=5V, EN=active
16
30
A
I
Q(OFF)
Off Supply Current
V
IN
=5.5V, EN (EN)=inactive
1
A
V
EN-THRSH
Enable Input Threshold
Low-to-high transition
2.4
V
High-to-low transition
0.8
V
I
EN
Enable Input Current
V
EN
= 0V to 5.5V
0.01
1
A
C
EN
Enable Input Capacitance
1
pF
R
ds(ON)
On-Resistance
V
IN
=5V, T
A
= 25C
60
100
m
V
IN
=3.0V, T
A
= 25C
70
115
m
T
ON
Output Turn-On Delay
V
IN
=5V, R
L
=10
0.25
ms
T
ON-RISE
Output Turn-On Rise Time
V
IN
=5V, R
L
=10
0.2
ms
T
OFF
Output Turn-Off Delay
V
IN
=5V, R
L
=10
5
20
s
T
OFF-FALL
Output Turn-Off Fall Time
V
IN
=5V, R
L
=10
20
s
I
SD(OFF)
Output Leakage Current
EN=inactive, V
IN
=5.5V, V
OUT
=0V
0.03
15
A
I
LIMIT
Current Limit Threshold
ramped load applied to enable
1.0
1.5
2.0
A
output, V
OUT
< 4.0V
OTMP
Over Temperature Shut Down
T
J
increasing
125
C
T
J
decreasing
115
C
R
FLG
Error Flag Output Resistance
V
IN
=5V, I
L
= 1mA
30
I
SINK
Error Flag Off Current
V
FLG
= 5.5V
0.05
1
A
V
UVLO
Under voltage Lockout
V
IN
= increasing, 1% hysteresis
2.0
2.3
2.7
V
T
BLANK
FAULT blanking
10
ms
Symbol
Description
Value
Units
JA
Maximum Thermal Resistance (SOP-8)
1
100
C/W
P
D
Maximum Power Dissipation (SOP-8)
1
1.25
W
Symbol
Description
Value
Units
V
IN
IN to GND
-0.3 to 6
V
V
FLG
FLG to GND
-0.3 to 6
V
I
FLG
FLG Current
50
mA
V
OUT
OUT to GND
-0.3 to V
IN
+0.3
V
I
OUT
Output Current (Internally Limited)
2.0
A
V
EN
EN to GND
-0.3 to 6
V
T
S
Storage Temperature
150
C
T
LEAD
Maximum Soldering Temperature (at Leads)
300
C
AAT4625
USB Single-Channel Power Switch
4625.2002.1.0.93
3
Typical Characteristics
(Unless otherwise noted, V
IN
= 5V, T
A
= 25C)
Turn-ON/OFF Response with 10
Ohm 1
F load
EN (5V/div)
FAULT
Vout (2V/
div)
Iin (200mA/div)
Off-Switch Current vs. Temperature
0.0000
0.0001
0.0010
0.0100
0.1000
1.0000
-40
-20
0
20
40
60
80
100
120
Off-Switch Current (
A)
Off-Supply Current vs. Temperature
0.0010
0.0100
0.1000
1.0000
-40
-20
0
20
40
60
80
100
120
Temperature (
C)
Off-Supply Current (
A)
Current Limit
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
0
1
2
3
4
5
O
Output (A)
utput (V)
Quiescent Current
0
2
4
6
8
10
12
14
16
18
20
0
1
2
3
4
5
6
Input (V)
Input (
A)
Quiescent Current vs. Temperature
0
5
10
15
20
25
30
-40
-20
0
20
40
60
80
100
120
Temp
Q
u
i
escen
t
C
urren
t
(
A)
erature (
C)
AAT4625
USB Single-Channel Power Switch
4
4625.2002.1.0.93
(Unless otherwise noted, V
IN
= 5V, T
A
= 25C)
R
ds(ON)
vs. Temperature
40.0
45.0
50.0
55.0
60.0
65.0
70.0
75.0
80.0
-40
-20
0
20
40
60
80
100
120
Temperature (
C)
V
CC
=3V
V
CC
=5V
Short Circuit Through 0.6 Ohm
0
2
4
6
8
-1
0
1
2
3
4
5
Ti
Input and Output (V)
Output (A)
me (
s)
-3
0
3
6
9
Input Voltage
Output Current
Output Voltage
Short Circuit Through 0.3 Ohm
0
2
4
6
8
-1
0
1
2
3
4
5
Tim
Input and Output (V)
Output (A)
e (
s)
-4
0
4
8
12
Input Voltage
Output Current
Output Voltage
Thermal Shutdown Response
50ms/ div
EN (5V/div)
FAULT (5V/div)
Vout (1V/div)
Iin (500mA/div)
Start Into 1 Ohm load
1ms/div
EN (5V/div)
FAULT (5V/div)
Vout (1V/div)
Iin (500mA/div)
AAT4625
USB Single-Channel Power Switch
4625.2002.1.0.93
5
Functional Block Diagram
1.2V
Reference
Current
Limit
Over-Temp
Protection
Under-
voltage
Lockout
IN
EN (EN)
GND
FLG
OUT
AAT4625
USB Single-Channel Power Switch
6
4625.2002.1.0.93
Ordering Information
Package Information
SOP-8
1 2
E
b
e
H
D
A1
A
A2
7 (4x)
c
L
y
Q
Package
Enable
Marking
Part Number
Bulk
Tape and Reel
SOP8
EN (Active-high)
AAT4625IAS-1-B1
AAT4625IAS-1-T1
SOP8
EN (Active-low)
AAT4625IAS-B1
AAT4625IAS-T1
TSSOP8
EN (Active-high)
AAT4625IHS-1-B1
AAT4625IHS-1-T1
TSSOP8
EN (Active-low)
AAT4625IHS-B1
AAT4625IHS-T1
AAT4625
USB Single-Channel Power Switch
4625.2002.1.0.93
7
Dim
Millimeters
Inches
Min
Max
Min
Max
A
1.35
1.75
0.053
0.069
A1
0.10
0.25
0.004
0.010
A2
1.45
0.057
B
0.33
0.51
0.013
0.020
C
0.19
0.25
0.007
0.010
D
4.80
5.00
0.189
0.197
E3.80
4.00
0.150
0.157
e
1.27
0.050
H
5.80
6.20
0.228
0.244
L
0.40
1.27
0.016
0.050
Y
0.00
0.10
0.000
0.004
1
0
8
0
8
Note:
1. PACKAGE BODY SIZES EXCLUDE MOLD FLASH
PROTRUSIONS OR GATE BURRS.
2. TOLERANCE 0.1000mm (4mil) UNLESS
OTHERWISE SPECIFIED
3. COPLANARITY: 0.1000mm
4. DIMENSION L IS MEASURED IN GAGE PLANE.
5. CONTROLLING DIMENSION IS MILLIMETER;
CONVERTED INCH DIMENSIONS ARE NOT
NECESSARILY EXACT.
TSSOP-8
A1
b
e
E
1 2
A
A2
E1
DETAIL A
R
L1
L
0.20
D
R1
2
E
1
DETAIL A
AAT4625
USB Single-Channel Power Switch
8
4625.2002.1.0.93
Advanced Analogic Technologies, Inc.
1250 Oakmead Parkway, Suite 310, Sunnyvale, CA 94086
Phone (408) 524-9684
Fax (408) 524-9689
Dim
Millimeters
Inches
Min
Max
Min
Max
A
1.05
1.20
0.041
0.047
A1
0.05
0.15
0.002
0.006
A2
-
1.05
-
0.041
b
0.25
0.30
0.010
0.012
c
0.127
0.005
D-8
2.90
3.10
0.114
0.122
D-28
9.60
9.80
0.378
0.386
E4.30
4.50
0.170
0.177
E1
6.20
6.60
0.244
0.260
e
0.65 BSC
0.025 BSC
L
0.50
0.70
0.20
0.028
L1
1.0
0.039
R
0.09
-
0.004
-
R1
0.09
-
0.004
-
1
0
8
0
8
2
12
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