Current Limited Load Switch in SOT23 Package
General Description
The AAT4611 SmartSwitch is a current limited P-
channel MOSFET power switch designed for high-
side load switching applications. This switch oper-
ates 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 currents which may cause the supply
to fall out of regulation. The AAT4611 is also pro-
tected from thermal overload which limits power
dissipation and junction temperatures. It can be
used to control loads that require up to 1A. Current
limit threshold is programmed with a resistor from
SET to ground. The quiescent supply current is
typically a low 15µA max. In shutdown mode, the
supply current decreases to less than 1µA.
The AAT4611 is available in a Pb-free 5-pin SOT23
package and is specified over the -40°C to +85°C
temperature range.
AAT4611
Features
•
•
•
•
•
•
•
•
•
•
•
SmartSwitch
™
Input Voltage Range: 2.7V to 5.5V
Programmable Over-Current Threshold
Fast Transient Response:
— <1µs Response to Short Circuit
Low Quiescent Current
— 15µA Typical
— 1µA Max with Switch Off
160mΩ Typical R
DS(ON)
Only 2.5V Needed for ON/OFF Control
Under-Voltage Lockout
Thermal Shutdown
4kV ESD Rating
5-Pin SOT23 Package
Temperature Range: -40°C to +85°C
Applications
•
•
•
•
Hot Swap Supplies
Notebook Computers
Peripheral Ports
Personal Communication Devices
Typical Application
INPUT
IN
OUT
OUTPUT
AAT4611
ON (ON)
ON/(ON)
GND
1µF
R
SET
0.47µF
SET
GND
GND
4611.2006.09.1.4
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Current Limited Load Switch in SOT23 Package
Pin Descriptions
Pin #
1
2
3
4
5
AAT4611
Symbol
OUT
GND
SET
ON
IN
Function
P-channel MOSFET drain. Connect a 0.47µF capacitor from OUT to GND.
Ground connection.
Current limit set input. A resistor from SET to ground sets the current limit for
the switch.
Enable input. Two versions are available, active-high and active-low. See
Ordering Information for details.
P-channel MOSFET source. Connect a 1µF capacitor from IN to GND.
Pin Configuration
SOT23-5
(Top View)
OUT
GND
SET
1
5
IN
2
3
4
ON
2
4611.2006.09.1.4
Current Limited Load Switch in SOT23 Package
Absolute Maximum Ratings
1
T
A
= 25°C, unless otherwise noted.
Symbol
V
IN
V
ON
V
SET,
V
OUT
I
MAX
T
J
T
LEAD
V
ESD
AAT4611
Description
IN to GND
ON(ON) to GND
SET, OUT to GND
Maximum Continuous Switch Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads)
ESD Rating
2
- HBM
Value
-0.3 to 6
-0.3 to V
IN
+ 0.3
-0.3 to V
IN
+ 0.3
2
-40 to 150
300
4000
Units
V
V
V
A
°C
°C
V
Thermal Characteristics
3
Symbol
Θ
JA
P
D
Description
Thermal Resistance
Power Dissipation
Value
150
667
Units
°C/W
mW
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi-
tions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
3. Mounted on a demo board.
4611.2006.09.1.4
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Current Limited Load Switch in SOT23 Package
Electrical Characteristics
V
IN
= 5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are T
A
= 25°C.
Symbol
V
IN
I
Q
I
Q(OFF)
I
SD(OFF)
V
UVLO
R
DS(ON)
I
LIM
I
LIM(MIN)
V
ON(L)
V
ON(H)
I
ON(SINK)
T
RESP
T
OFF
T
ON
AAT4611
Description
Operation Voltage
Quiescent Current
Off-Supply Current
Off-Switch Current
Under-Voltage Lockout
On Resistance
Current Limit
Minimum Current Limit
ON (ON) Input Low Voltage
ON (ON) Input High Voltage
ON (ON) Input Leakage
Current Limit Response Time
Turn-Off Time
Turn-On Time
Conditions
V
IN
= 5V, ON (ON) = Active, I
OUT
= 0
ON (ON) = Inactive, V
IN
= 5.5V
ON (ON) = Inactive, V
IN
= 5.5V, V
OUT
= 0
Rising Edge, 1% Hysteresis
V
IN
= 5.0V
V
IN
= 4.5V
V
IN
= 3.0V
R
SET
= 6.8kΩ
Min
2.7
Typ
15
0.03
2.3
160
165
195
1
130
Max
5.5
30
1
15
2.7
180
230
1.25
195
0.8
Units
V
µA
µA
µA
V
mΩ
A
mA
V
V
2.0
0.75
V
IN
= 2.7V to 3.6V
V
IN
= 4.5V to 5.5V
V
ON
= 5.5V
V
IN
= 5V
V
IN
= 5V, R
L
= 10Ω
V
IN
= 5V, R
L
= 10Ω
2.0
2.4
0.01
0.8
0.4
40
1
2
200
µA
µs
µs
µs
4
4611.2006.09.1.4
Current Limited Load Switch in SOT23 Package
Typical Characteristics
Unless otherwise noted, V
IN
= 5V, T
A
= 25°C.
Quiescent Current vs. Temperature
Quiescent Current (μA)
25
20
15
10
5
0
-40
-20
0
20
40
60
80
100
120
AAT4611
Quiescent Current
40
Input Current (µA)
30
20
10
0
2.5
3
3.5
4
4.5
5
5.5
Temperature (°C)
Input Voltage (V)
Output Current vs. Output Voltage
(
R
SET
= 16kΩ)
0.6
R
DS(ON)
vs. Temperature
250
200
Input = 3V
Input = 5V
Output Current (A)
0.4
R
DS(ON)
(mΩ)
150
100
50
0
0.2
0
0
1
2
3
4
5
-40
-20
0
20
40
60
80
100
Output Voltage (V)
Temperature (°C)
Off-Supply Current vs. Temperature
10
10
Off-Switch Current vs. Temperature
Off-Switch Current (µA)
Off-Supply Current (µA)
1
1
0.1
0.1
0.01
0.01
-40
-20
0
20
40
60
80
100
120
0.001
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Temperature (°C)
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Analog electronics
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