AAT4280A データシートの表示（PDF） - Skyworks Solutions

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AAT4280A

Slew Rate Controlled Load Switch

Skyworks Solutions 

Functional Block Diagram

IN

DATA SHEET

AAT4280A

Slew Rate Controlled Load Switch

OUT

ON/OFF

Level

Shift

Turn-On

Slew Rate

Control

*

GND

*AAT4280A-3 and -4 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 versions 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, the AAT4280A-1, has

a moderate turn-on slew rate feature, which reduces

inrush current when the MOSFET is turned on. This func-

tion allows the load switch to be implemented with either

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 condi-

tion. 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 output discharge features.

The third 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.

The final switch version, the AAT4280A-4, features a very

slow turn-on slew rate with a typical value of 4.5ms for

LCD panel applications.

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 applications. The ON/OFF con-

trol pin is TTL compatible and will also function with 2.5V

to 5V logic systems, making the AAT4280A an ideal

level-shifting load switch.

10

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

202230A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 31, 2012

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