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AAT1149

3MHz Fast Transient 400mA Step-Down Converter

Advanced Analogic Technologies 

SwitchRegTM

PRODUCT DATASHEET

AAT1149

3MHz Fast Transient 400mA Step-Down Converter

General Description

The AAT1149 SwitchReg is a 3.0MHz step-down con-

verter with an input voltage range of 2.7V to 5.5V and

output voltage as low as 1.0V. It is optimized to react

quickly to load variations and operate with a tiny 0603

inductor that is only 1mm tall.

The AAT1149 output voltage is programmable via exter-

nal feedback resistors. It can deliver 400mA of load cur-

rent while maintaining a low 45μA no load quiescent

current. The 3.0MHz switching frequency minimizes the

size of external components while keeping switching

losses low.

The AAT1149 maintains high efficiency throughout

the operating range, which is critical for portable

applications.

The AAT1149 is available in a Pb-free, space-saving

2.0x2.1mm SC70JW-8 package or a 5-pin wafer-level

chip scale (WLCSP) package and is rated over the -40°C

to +85°C temperature range.

Features

• Ultra-Small 0603 Inductor (Height = 1mm)

• VIN Range: 2.7V to 5.5V

• VOUT Adjustable from 1.0V to VIN

• 400mA Max Output Current

• Up to 98% Efficiency

• 45μA No Load Quiescent Current

• 3.0MHz Switching Frequency

• 70μs Soft Start

• Fast Load Transient

• Over-Temperature Protection

• Current Limit Protection

• 100% Duty Cycle Low-Dropout Operation

• <1μA Shutdown Current

• SC70JW-8 or 0.9x1.2mm WLCSP Package

• Temperature Range: -40°C to +85°C

Applications

• Cellular Phones

• Digital Cameras

• Handheld Instruments

• Microprocessor / DSP Core / IO Power

• PDAs and Handheld Computers

• USB Devices

Typical Application

VIN = 3.6V

C2

4.7µF

U1

AAT1149

IN

LX

EN

FB

AGND PGND

PGND PGND

VOUT = 1.8V

L1 1.8µH

R1

118k

R2

59k

C1

4.7µF

1149.2008.08.1.3

www.analogictech.com

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