AAT4618 datasheet(7/11 Pages) AAT

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Functional Block Diagram

OUT

ON (ON)

GND

Under-Voltage

Lockout

Over-Temperature

Protection

Current

Limit

FAULT

4ms Delay

AAT4618

Current Limited Load Switch

4618.2006.05.1.2

Functional Description

The AAT4618 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 AAT4618 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 thermal limit threshold. The device

will thermal cycle indefinitely until the over-current

condition is removed. The AAT4618 operates with

input voltages 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 AAT4618 MOSFET is protected from entering

the saturated region of operation by being auto-

matically shut down by an under-voltage lockout

circuit. A current limit condition is reported by the

open drain FAULT output. A 4ms blanking interval

prevents false reporting during the charging of a

capacitive load, which typically occurs during

device turn-on, but may also occur during a port

hot plug-in event.

The AAT4618 is ideally suited for protection of

peripheral ports such as USB, RS232, and parallel

ports.

AAT4618 Datasheet(PDF) 7 Page - Advanced Analog Technology, Inc.

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