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
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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
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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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AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
