AAT4280A-1(2005) 데이터 시트보기 (PDF) - Advanced Analogic Technologies
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AAT4280A-1 Datasheet PDF : 14 Pages
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Functional Block Diagram
IN
AAT4280A
Slew Rate Controlled Load Switch
OUT
ON/OFF
Level
Shift
Turn-On
Slew Rate
Control
*
GND
*AAT4280A-3 only
Functional Description
The AAT4280A is a family of flexible P-channel
MOSFET power switches designed for high-side
load switching applications. There are three ver-
sions of the AAT4280A with different turn-on and
turn-off characteristics to choose from, depending
upon the specific requirements of an application.
The first version, AAT4280A-1, has a moderate
turn-on slew rate feature, which reduces in-rush
current when the MOSFET is turned on. This func-
tion allows the load switch to be implemented with
a small input capacitor, or no input capacitor at all.
During turn-on slewing, the current ramps linearly
until it reaches the level required for the output load
condition. The proprietary turn-on current control
method works by careful control and monitoring of
the MOSFET gate voltage. When the device is
switched ON, the gate voltage is quickly increased
to the threshold level of the MOSFET. Once at this
level, the current begins to slew as the gate voltage
is slowly increased until the MOSFET becomes
fully enhanced. Once it has reached this point, the
gate is quickly increased to the full input voltage
and RDS(ON) is minimized. The second version, the
AAT4280A-2, is a very fast switch intended for
high-speed switching applications. This version
has no turn-on slew rate control and no special out-
put discharge features. The final switch version,
the AAT4280A-3, has the addition of a minimized
slew rate limited turn-on function and a shutdown
output discharge circuit to rapidly turn off a load
when the load switch is disabled through the
ON/OFF pin.
All versions of the AAT4280A operate with input
voltages ranging from 1.5V to 5.5V. All versions of
this device have extremely low operating current,
making them ideal for battery-powered applica-
tions. The ON/OFF control pin is TTL compatible
and will also function with 2.5V to 5V logic systems,
making the AAT4280A an ideal level shifting load-
switch.
4280A.2005.02.1.1
9
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