Current Limited Load Switch
General Description
The AAT4612 SmartSwitch is a current limited P-
channel MOSFET power switch designed for high-
side load switching applications operating with
inputs ranging from 2.4V to 5.5V, making it ideal for
both 3V and 5V systems. An integrated current
limiting circuit protects the input supply from large
currents which could potentially cause the supply
to fall out of regulation. In addition, the AAT4612’s
thermal overload protection limits power dissipa-
tion and junction temperatures associated with pro-
longed periods of operation in current limit. Due to
its low R
DS(ON)
, the AAT4612 can be used to control
loads that require up to 1A even while operating at
high ambient temperatures. The ultra-fast current
limit response to a sudden short circuit is a mere
500ns which reduces the requirements of local
supply bypassing. Quiescent current is a low 10µA
and, in shutdown mode, the supply current
decreases to less than 1µA.
The AAT4612 is available in a Pb-free 5-pin SOT23
package or a Pb-free 8-pin SC70JW package and
is specified over the -40°C to +85°C temperature
range.
AAT4612
Features
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SmartSwitch
™
Input Voltage Range: 2.4V to 5.5V
1A Current Limit Trip Threshold
Fast Transient Response:
• <1µs Response to Short Circuit
Low Quiescent Current:
• 10µA Typ
• 1µA Max with Switch Off
100mΩ Typical R
DS(ON)
Under-Voltage Lockout
Thermal Shutdown
4kV ESD Rating
5-Pin SOT23 or 8-Pin SC70JW Package
-40°C to +85°C Temperature Range
Applications
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Hot Swap Supplies
Notebook Computers
Peripheral Ports
Personal Communication Devices
Typical Application
INPUT
IN
OUT
V
CC
AAT4612
C
IN
1μF
ON
ON
GND
C
OUT
0.47μF
GND
GND
4612.2006.09.1.3
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AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
