General Description
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 R
DS(ON)
of 80mΩ, allowing increased
load switch power handling capacity and is avail-
able 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 R
DS(ON)
characteristics. The
AAT4280A (-2) version features fast load switch
turn-on capabilities, typically less than 500ns turn-
on and 3µs turn-off times. The AAT4280A (-3) vari-
ation offers a shutdown load discharge circuit to
rapidly turn off a load circuit when the switch is dis-
abled. 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 quiescent supply current is very
low, typically 25nA.
The AAT4280A is available in an 8-pin SC70JW
package and is specified over the -40°C to +85°C
temperature range.
Features
• 1.5V 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
— 25nA (typ)
• TTL/CMOS Input Logic Level
• Temperature Range: -40ºC to +85°C
• 4kV ESD Rating
• 8-Pin SC70JW Package
Applications
• Cellular Telephones
• Digital Still Cameras
• Hot Swap Supplies
• Notebook Computers
• Personal Communication Devices
• Personal Digital Assistants (PDAs)
AAT4280A
Slew Rate Controlled Load Switch
Typical Application
AAT4280A
C
OUT
0.1µF
CIN
1µF
OUTIN
GND
V
OUT
GNDGND
V
IN
ON/OFF
GND
IN
ON
4280A.2005.02.1.1 1
SmartSwitch
™