AAT1112ITP-0.6-T1 データシートの表示（PDF） - Analog Technology Inc

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AAT1112ITP-0.6-T1

1.5A, 1.4MHz Step-Down Converter

Analog Technology Inc 

General Description

The AAT1112 SwitchReg is a 1.5A step-down con-

verter with an input voltage range of 2.4V to 5.5V

and an adjustable output voltage from 0.6V to VIN.

The 1.4MHz switching frequency enables the use

of small external components. The small footprint

and high efficiency make the AAT1112 an ideal

choice for portable applications.

The AAT1112 delivers 1.5A maximum output current

while consuming only 42µA of no-load quiescent

current. Ultra-low RDS(ON) integrated MOSFETs and

100% duty cycle operation make the AAT1112 an

ideal choice for high output voltage, high current

applications which require a low dropout threshold.

The AAT1112 provides excellent transient

response and high output accuracy across the

operating range. No external compensation com-

ponents are required.

The AAT1112 is designed to maintain high efficien-

cy throughout the load range. Pulling the MODE/

SYNC pin high enables "PWM Only" mode, main-

taining constant frequency and low output ripple

across the operating range. Alternatively, the con-

verter may be synchronized to an external clock

input via the MODE/SYNC pin. Over-temperature

and short-circuit protection safeguard the AAT1112

and system components from damage.

The AAT1112 is available in a Pb-free, space-sav-

ing TDFN33-12 or 2.75x3mm TSOPJW-12 pack-

age. The product is rated over an operating tem-

perature range of -40°C to +85°C.

AAT1112

1.5A, 1.4MHz Step-Down Converter

Features

SwitchReg™

• 1.5A Maximum Output Current

• Input Voltage: 2.4V to 5.5V

• Output Voltage: 0.6V to VIN

• Up to 95% Efficiency

• 42µA No Load Quiescent Current

• No External Compensation Required

• 1.4MHz Switching Frequency

• Synchronizable to External Clock

• Optional "PWM Only" Low Noise Mode

• 100% Duty Cycle Low-Dropout Operation

• Internal Soft Start

• Over-Temperature and Current Limit

Protection

• <1µA Shutdown Current

• TSOPJW-12 or TDFN33-12 Package

• Temperature Range: -40°C to +85°C

Applications

• Cellular Phones

• Digital Cameras

• Hard Disk Drives

• MP3 Players

• PDAs and Handheld Computers

• Portable Media Players

• USB Devices

Typical Application

VIN

C2

10µF

VP

LX

AAT1112

VIN

EN

FB

MODE/SYNC

GND

PGND

L1

3.3µH

VOUT= 3.3V

R1

267kΩ

R2

59kΩ

C1

22µF

1112.2007.01.1.1

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