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AAT1152

850kHz 1A Synchronous Buck DC/DC Converter

Analog Technology Inc 

AAT1152

850kHz 1A Synchronous Buck DC/DC Converter

General Description

The AAT1152 SwitchReg™ is a member of

AnalogicTech™'s Total Power Management™ IC

product family. The Step-down switching converter

is ideal for applications where high efficiency, small

size, and low ripple are critical. Able to deliver 1A

with internal Power MOSFETs, the current-mode

controlled IC provides high efficiency using syn-

chronous rectification. Fully internally compensat-

ed, the AAT1152 simplifies system design and low-

ers external part count.

The AAT1152 features a Power Good (POK) func-

tion which monitors the output, alerting the system

if the output voltage falls out of regulation.

The AAT1152 is available in MSOP-8 package,

rated over -40 to 85°C.

Features

SwitchReg™

• 5.5V max supply input

• Fixed output voltage: 1.1V–4.2V with 100 mV

increment

• 1A output current

• Integrated low on resistance power switches

• Synchronous rectification

• Up to 95% efficiency

• Power Good signal

• Internally compensated current mode control

• High initial accuracy: ±1%

• 850kHz switching frequency

• Constant PWM mode

• Low output ripple with light load

• Internal softstart

• Current limit protection

• Over-Temperature protection

• MSOP-8 package

Typical Application

INPUT

100k

10µF

100Ω

0.1µF

Applications

• Computer Peripherals

• Set Top Boxes

• Network Cards

• Cable/DSL Modems

• High efficiency conversion from 5V or 3.3V

supply

VP

AAT1152 FB

POK

LX

ENABLE

VCC

SGND

PGND

4.1µH

47µF

OUTPUT

1152.2003.01.0.9

1

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