SmartSwitch™
AAT4625
USB Single-Channel Power Switch
Preliminary Information
4625.2002.1.0.93 1
General Description
The AAT4625 SmartSwitch™ is part of
AnalogicTech's Application Specific Power
MOSFET™ (ASPM™) 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 16µA. In
shutdown mode, the supply current decreases to
less than 1µA.
The AAT4625 is available in 8 pin SOP or TSSOP
and is specified over a -40 to 85°C temperature
range.
The AAT4600 Series is a family of adjustable and
fixed SmartSwitch™ 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
• 60mΩ typical RDS(ON)
• Low quiescent current
• Typically 16µA
• 1µA max with Switch off
• Thermal shutdown
• Fault flag with 10ms blanking
• Undervoltage Lockout
• Temp range -40 to 85°C
• 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
120µF
GNDGND
OUTPUT
OUT
OUT
IN
EN (EN)EN (EN)
0.1µF
VCC 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
24625.2002.1.0.93
Absolute Maximum Ratings (TA=25°C 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 (VIN = 5V, TA= -40 to 85°C unless otherwise noted. Typical values
are at TA=25°C; bold values designate full temperature range)
Symbol Description Conditions Min Typ Max Units
VIN Operation Voltage 2.7 5.5 V
IQQuiescent Current VIN=5V, EN=active 16 30 µA
IQ(OFF) Off Supply Current VIN=5.5V, EN (EN)=inactive 1µA
VEN-THRSH Enable Input Threshold Low-to-high transition 2.4 V
High-to-low transition 0.8 V
IEN Enable Input Current VEN = 0V to 5.5V 0.01 1µA
CEN Enable Input Capacitance 1 pF
Rds(ON) On-Resistance VIN =5V, TA = 25°C 60 100 mΩ
VIN =3.0V, TA = 25°C 70 115 mΩ
TON Output Turn-On Delay VIN =5V, RL=10Ω 0.25 ms
TON-RISE Output Turn-On Rise Time VIN =5V, RL=10Ω 0.2 ms
TOFF Output Turn-Off Delay VIN =5V, RL=10Ω 5 20 µs
TOFF-FALL Output Turn-Off Fall Time VIN =5V, RL=10Ω 20 µs
ISD(OFF) Output Leakage Current EN=inactive, VIN=5.5V, VOUT=0V 0.03 15 µA
ILIMIT Current Limit Threshold ramped load applied to enable 1.0 1.5 2.0 A
output, VOUT < 4.0V
OTMP Over Temperature Shut Down TJincreasing 125 °C
TJdecreasing 115 °C
RFLG Error Flag Output Resistance VIN =5V, IL = 1mA 30 Ω
ISINK Error Flag Off Current VFLG = 5.5V 0.05 1µA
VUVLO Under voltage Lockout VIN = increasing, 1% hysteresis 2.0 2.3 2.7 V
TBLANK FAULT blanking 10 ms
Symbol Description Value Units
ΘJA Maximum Thermal Resistance (SOP-8)1100 °C/W
PDMaximum Power Dissipation (SOP-8)11.25 W
Symbol Description Value Units
VIN IN to GND -0.3 to 6 V
VFLG FLG to GND -0.3 to 6 V
IFLG FLG Current 50 mA
VOUT OUT to GND -0.3 to VIN+0.3 V
IOUT Output Current (Internally Limited) 2.0 A
VEN EN to GND -0.3 to 6 V
TSStorage Temperature 150 °C
TLEAD Maximum Soldering Temperature (at Leads) 300 °C
AAT4625
USB Single-Channel Power Switch
4625.2002.1.0.93 3
Typical Characteristics
(Unless otherwise noted, VIN = 5V, TA= 25°C)
Turn-ON/OFF Response with 10
Ohm 1µFload
EN (5V/div)
FAULT Vout (2V/
µ
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 (µA)
Off-Supply Current vs. Temperature
0.0010
0.0100
0.1000
1.0000
-40 -20 0 20 40 60 80 100 12
0
Temperature (°C)
Off-Supply Current (µA)
Current Limit
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
012345
O
Output (A)
utput (V)
Quiescent Current
0
2
4
6
8
10
12
14
16
18
20
0123456
Input (V)
Input (µA)
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
(
µ
A)
erature (°C)
AAT4625
USB Single-Channel Power Switch
44625.2002.1.0.93
(Unless otherwise noted, VIN = 5V, TA= 25°C)
Rds(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)
VCC=3V
VCC=5V
Short Circuit Through 0.6 Ohm
0
2
4
6
8
-1012345
Ti
Input and Output (V)
Output (A)
me (µs)
-3
0
3
6
9
Input Voltage
Output Current
Output Voltage
Short Circuit Through 0.3 Ohm
0
2
4
6
8
-1012345
Tim
Input and Output (V)
Output (A)
e(µs)
-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)
FA
U
LT
(5
V
/d
iv)
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
64625.2002.1.0.93
Ordering Information
Package Information
SOP-8
1 2
E
be
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
E 3.80 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
θ10° 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
AA2
E1 DETAIL A
R
L1
L
0.20
D
R1
2
E
1
DETAIL A
AAT4625
USB Single-Channel Power Switch
84625.2002.1.0.93
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
E 4.30 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 -
θ10° 8° 0° 8°
θ2 12°
