AAT4612 datasheet(7/11 Pages) AAT

7 / 11 page

Functional Description

The AAT4612 is a single channel current limited

load switch that protects against short circuits by

current limiting to a preset level. A patented fast

acting current limit loop limits the current in a frac-

tion of a microsecond and instantly resets to low

impedance once the short-circuit condition is

removed. The AAT4612 is internally protected from

thermal damage by an over-temperature detection

circuit. If the die temperature reaches the internal

thermal limit, the power device is switched off until

the die temperature cools to a level below the ther-

mal limit threshold. The device will thermal cycle

indefinitely until the over-current condition is

removed. The AAT4612 operates with input volt-

ages ranging from 2.4V to 5.5V which, along with

its extremely low operating current, makes it ideal

for battery-powered applications. In cases where

the input voltage drops below 2.4V, the AAT4612

MOSFET is protected from entering the saturated

region of operation by being automatically shut

down by an under-voltage lockout circuit.

The AAT4612 is ideally suited for protection of

peripheral ports such as USB, RS232, and parallel

ports.

AAT4612

Current Limited Load Switch

4612.2006.09.1.3

Functional Block Diagram

OUT

GND

Under-Voltage

Lockout

Over-

Temperature

Protection

Current

Limit

AAT4612 Arkusz danych(PDF) 7 Page - Advanced Analog Technology, Inc.