AAT4292 Просмотр технического описания (PDF) - Analog Technology Inc

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AAT4292

Seven Channel High-Side I/O Expander

Analog Technology Inc 

SmartSwitchTM

Functional Block Diagram

VIN

UVLO

EN/SET

PRODUCT DATASHEET

AAT4292

Seven Channel High-Side I/O Expander

Logic Control

and Level Shift

ROM

AS2Cwire Interface

OUT1

OUT2

OUT3

OUT4

OUT5

OUT6

OUT7

GND

Functional Description

The AAT4292 consists of seven P-channel MOSFET power

switches designed for I/O expansion applications. The

device operates with input voltages ranging from 1.8V to

5.5V which, along with its extremely low operating cur-

rent, makes it ideal for battery-powered applications. In

cases where the input voltage drops below 1.8V, the

AAT4292 MOSFETs are protected from entering the linear

region of operation by automatically shutting down.

In addition, the TTL-compatible EN/SET pin makes the

AAT4292 an ideal level-shifted load switch. An optional

slew rate controlling feature eliminates inrush current

when a MOSFET is turned on, allowing the AAT4292 to

be implemented with a small input capacitor or no

capacitor at all, while maintaining isolation between

channels. During slewing, 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 volt-

8

www.analogictech.com

4292.2008.08.1.0

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