Slew Rate Controlled Load Switch
General Description
The AAT4280 SmartSwitch is a P-channel MOSFET
power switch designed for high-side load switching
applications. The P-channel MOSFET device has a
typical R
DS(ON)
of 80mΩ, allowing increased load
switch power handling capacity. This device is avail-
able in three different versions with flexible turn on
and off characteristics from very fast to slew rate lim-
ited. The standard AAT4280 (-1) version has a slew
rate limited turn on load switch and is functionally
compatible with the AAT4250 device while offering
superior R
DS(ON)
characteristics. The AAT4280 (-2)
version features fast load switch turn on capabilities,
typically less than 500ns turn on and 3µs turn off
times. The AAT4280 (-3) variation offers a shutdown
load discharge circuit to rapidly turn off a load circuit
when the switch is disabled. All AAT4280 load switch
versions operate with an input voltage ranging from
1.8V to 5.5V, making them ideal for both 3V and 5V
systems. The AAT4280 also features an under-volt-
age lockout which turns the switch off when an input
under-voltage condition exists. Input logic levels are
TTL and 2.5V to 5V CMOS compatible. The quies-
cent supply current is very low, typically 2.5µA. In
shutdown mode, the supply current decreases to
less than 1µA.
The AAT4280 is available in a Pb-free, 6-pin
SOT23 or 8-pin SC70JW package and is specified
over the -40°C to +85°C temperature range.
AAT4280
Features
•
•
•
SmartSwitch
™
•
•
•
•
•
•
1.8V to 5.5V Input Voltage Range
Very Low R
DS(ON)
, Typically 80mΩ (5V)
Slew Rate Limited Turn-On Time Options
— 1ms
— 0.5µs
— 100µs
Fast Shutdown Load Discharge Option
Low Quiescent Current
— 2.5µA Typical
— 1µA Max in Shutdown
TTL/CMOS Input Logic Level
Temperature Range: -40ºC to +85°C
4kV ESD Rating
6-Pin SOT23 or 8-Pin SC70JW Package
Applications
•
•
•
•
•
•
Cellular Telephones
Digital Still Cameras
Hot Swap Supplies
Notebook Computers
Personal Communication Devices
Personal Digital Assistants (PDA)
Typical Application
V
IN
IN
IN
C
IN
1μF
ON
ON/OFF
GND
GND
OUT
V
OUT
AAT4280
C
OUT
0.1μF
GND
GND
4280.2006.11.1.4
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AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
