AAT4280A
Slew Rate Controlled Load Switch
™
SmartSwitch
General Description
Features
The AAT4280A SmartSwitch is a member of
AnalogicTech's Application Specific Power MOS-
FET™ (ASPM™) product family. The AAT4280A is
a P-channel MOSFET power switch designed for
high-side load switching applications. The device
has a typical RDS(ON) of 80mΩ, allowing increased
load switch power handling capacity. The device is
available in three different versions with flexible
turn-on and turn-off characteristics — from very
fast to slew rate limited. The standard AAT4280A
(-1) version has a slew rate limited turn-on load
switch and is functionally compatible with the
AAT4250 device, while offering superior RDS(ON)
characteristics. The AAT4280A (-2) version fea-
tures fast load switch turn-on capabilities, typically
less than 500ns turn-on and 3µs turn-off times.
The AAT4280A (-3) variation offers a shutdown
load discharge circuit to rapidly turn off a load cir-
cuit when the switch is disabled. All AAT4280A
load switch versions operate with an input voltage
ranging from 1.5V to 5.5V, making them ideal for
both 3V and 5V systems. Input logic levels are
TTL and 2.5V to 5V CMOS compatible. The qui-
escent supply current is very low, typically 25nA.
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1.5V to 5.5V Input Voltage Range
Very Low RDS(ON), Typically 80mΩ (5V)
Slew Rate Limited Turn-On Time Options
— 1ms
— 0.5µs
— 100µs
Fast Shutdown Load Discharge Option
Low Quiescent Current
— 25nA (typ)
TTL/CMOS Input Logic Level
Temperature Range: -40ºC to +85°C
4kV ESD Rating
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8-Pin SC70JW Package
Applications
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Cellular Telephones
Digital Still Cameras
Hot Swap Supplies
Notebook Computers
Personal Communication Devices
Personal Digital Assistants (PDAs)
The AAT4280A is available in a Pb-free, 8-pin
SC70JW package and is specified over the -40°C
to +85°C temperature range.
Typical Application
VIN
IN
OUT
VOUT
AAT4280A
IN
CIN
1µF
COUT
0.1µF
ON/OFF
ON
GND
GND
GND
GND
4280A.2005.11.1.3
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