AAT4282A 데이터 시트보기 (PDF) - Advanced Analogic Technologies

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AAT4282A

Slew Rate Controlled Load Switch

Advanced Analogic Technologies 

SmartSwitchTM

Functional Block Diagram

INA

ON/OFF A

FAST /

SLOW

INB

ON/OFF B

PRODUCT DATASHEET

AAT4282A

Slew Rate Controlled Load Switch

Level

Shift

Turn-On Slew

Rate Control

*

OUTA

Level

Shift

Turn-On Slew

Rate Control

*

OUTB

GND

* AAT4282A-3 version only.

Functional Description

The AAT4282A is a family of flexible dual P-channel

MOSFET power switches designed for high-side load

switching applications. There are three versions of the

AAT4282A with different turn-on and turn-off character-

istics to choose from, depending upon the specific

requirements of an application. The first version, the

AAT4282A-1, has a moderate turn-on slew rate feature,

which reduces in-rush current when the MOSFET is

turned on. This function 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 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 the RDS(ON) is minimized.

The second version, the AAT4282A-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 final switch ver-

sion, the AAT4282A-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. Using the

FAST input pin on the AAT4282A-3, the device can be

manually switched to a slower slew rate.

All versions of the AAT4282A operate with input voltages

ranging from 1.5V to 6.5V. All versions of this device

have extremely low operating current, making them

ideal for battery-powered applications.

The ON/OFF control pin is TTL compatible and will also

function with 2.5V to 5V logic systems, making the

AAT4282A an ideal level-shifting load switch.

8

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