AAT1121 データシートの表示（PDF） - Advanced Analogic Technologies

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AAT1121

1.5MHz, 250mA Step-Down Converter

Advanced Analogic Technologies 

AAT1121

1.5MHz, 250mA Step-Down Converter

General Description

The AAT1121 SwitchReg is a 1.5MHz step-down

converter with an input voltage range of 2.7V to

5.5V and output as low as 0.6V. Its low supply

current, small size, and high switching frequency

make the AAT1121 the ideal choice for portable

applications.

The AAT1121 delivers 250mA of load current, while

maintaining a low 30µA no load quiescent current.

The 1.5MHz switching frequency minimizes the size

of external components, while keeping switching

losses low. The AAT1121 feedback and control

delivers excellent load regulation and transient

response with a small output inductor and capacitor.

The AAT1121 is available in a Pb-free, 8-pin,

2x2mm TDFN or STDFN package and is rated

over the -40°C to +85°C temperature range.

Features

SwitchReg™

• VIN Range: 2.7V to 5.5V

• VOUT Range: 0.6V to VIN

• 250mA Max Output Current

• Up to 96% Efficiency

• 30µA Typical Quiescent Current

• 1.5MHz Switching Frequency

• Soft-Start Control

• Over-Temperature and Current Limit

Protection

• 100% Duty Cycle Low-Dropout Operation

• <1µA Shutdown Current

• Small External Components

• Ultra-Small TDFN22-8 or STDFN22-8

Package

• Temperature Range: -40°C to +85°C

Applications

• Bluetooth™ Headsets

• Cellular Phones

• Digital Cameras

• Handheld Instruments

• Portable Music Players

• USB Devices

Typical Application

VIN

C1

4.7µF

AAT1121

VP

LX

VIN

EN

FB

GND PGND

VO = 1.8V

L1

3.0μH

R1

118kΩ

250mA

R2

59kΩ

C2

4.7µF

1121.2007.03.1.2

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