AAT4280A
Slew Rate Controlled Load Switch
General Description
The AAT4280A SmartSwitch鈩?is a member of
AnalogicTech's Application Specific Power MOS-
FET鈩?(ASPM鈩? 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 80m鈩? 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 3碌s 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擄C to +85擄C
temperature range.
Features
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SmartSwitch
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1.5V to 5.5V Input Voltage Range
Very Low R
DS(ON)
, Typically 80m鈩?(5V)
Slew Rate Limited Turn-On Time Options
鈥?1ms
鈥?0.5碌s
鈥?100碌s
Fast Shutdown Load Discharge Option
Low Quiescent Current
鈥?25nA (typ)
TTL/CMOS Input Logic Level
Temperature Range: -40潞C to +85擄C
4kV ESD Rating
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)
Typical Application
V
IN
IN
IN
C
IN
1碌F
ON
OUT
V
OUT
AAT4280A
GND
GND
C
OUT
0.1碌F
ON/OFF
GND
GND
4280A.2005.02.1.1
1
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