AAT4250 데이터 시트보기 (PDF) - Analog Technology Inc

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AAT4250

Slew Rate Controlled Load Switch

Analog Technology Inc 

Functional Block Diagram

AAT4250

Slew Rate Controlled Load Switch

IN

ON/OFF

OUT

Under-

voltage

Lockout

Slew Rate

Control

Level

Shift

GND

Functional Description

The AAT4250 is a slew rate controlled P-channel

MOSFET power switch designed for high-side load-

switching applications. It operates with input volt-

ages ranging from 1.8V 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 1.8V, the AAT4250 MOS-

FET is protected from entering the saturated region

of operation by automatically shutting down. In

addition, the TTL compatible ON/OFF pin makes

the AAT4250 an ideal level shifted load-switch. The

slew rate controlling feature eliminates in-rush cur-

rent when the MOSFET is turned on, allowing the

AAT4250 to be implemented with a small input

capacitor, or no input capacitor at all. During slew-

ing, the current ramps linearly until it reaches the

level required for the output load condition. The

proprietary control method works by careful control

and monitoring of the MOSFET gate voltage. When

the device is switched ON, the gate voltage is quick-

ly 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.

4250.2001.12.0.94

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