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AAT1151

850kHz 700mA Synchronous Buck DC/DC Converter

Advanced Analogic Technologies 

General Description

The AAT1151 SwitchReg™ is a step-down switch-

ing converter ideal for applications where high effi-

ciency is required over the full range of output load

conditions. The 2.7V to 5.5V input voltage range

makes the AAT1151 ideal for single-cell lithium-

ion/polymer battery applications. Capable of more

than 700mA with internal MOSFETs, the current-

mode controlled IC provides high efficiency using

synchronous rectification. Fully integrated compen-

sation simplifies system design and lowers external

parts count.

The device operates at a fixed 850kHz switching fre-

quency and enters Pulse Frequency Modulation

(PFM) mode for light load current to maintain high

efficiency across all load conditions.

The AAT1151 is available in Pb-free MSOP-8 and

QFN33-16 packages and is rated over the -40°C to

+85°C temperature range.

AAT1151

850kHz 700mA Synchronous

Buck DC/DC Converter

Features

SwitchReg™

• VIN Range: 2.7V to 5.5V

• Up to 95% Efficiency

• High Initial Accuracy ±1%

• 110mΩ RDS(ON) Internal Switches

• <1μA Shutdown Current

• 850kHz Switching Frequency

• Fixed VOUT or Adjustable VOUT ≥1.0V

• Integrated Power Switches

• Synchronous Rectification

• Current Mode Operation

• Internal Compensation

• Stable with Ceramic Capacitors

• PFM for Optimum Efficiency for All Load

Conditions

• Internal Soft Start

• Over-Temperature Protection

• Current Limit Protection

• MSOP-8 and QFN33-16 Packages

• -40°C to +85°C Temperature Range

Typical Application

INPUT

10μF

100Ω

0.1μF

Applications

• Cellular Phones

• Digital Cameras

• MP3 Players

• Notebook Computers

• PDAs

• USB-Powered Equipment

• Wireless Notebook Adapters

VP

FB

AAT1151

LX

ENABLE

VCC

SGND

PGND

3.0μH

2x 22μF

OUTPUT

1151.2007.01.1.6

1

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