AAT2749 Advanced Analogic Technologies, Inc., AAT2749 Datasheet

AAT2749

Manufacturer Part Number

AAT2749

Description

3.0mhz Step-down Converter And Low Vin Ldo

Manufacturer

Advanced Analogic Technologies, Inc.

Datasheet

1.AAT2749.pdf (18 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

AAT2749IUR-IE-T1

Manufacturer:

SKYWORKS/思佳讯

Quantity:

20 000

Current page: 1 of 18
Download datasheet (3Mb)

General Description

The AAT2749 is a two channel power regulator that oper-

ates from 2.3V to 5.5V. The AAT2749 contains a 3.0MHz,

600mA step-down converter and a low input voltage

300mA LDO regulator.

The step-down converter can deliver 600mA of load cur-

rent. The 3.0MHz switching frequency minimizes the size

of external components while keeping switching losses

low. The AAT2749 step-down converter maintains high

efficiency throughout the operating range, which is criti-

cal for portable applications.

operation can be forced by a logic signal on the MODE

pin.

The AAT2749 also contains a 300mA LDO regulator with

input voltage capability as low as 1.62V. The LDO regula-

tor power input can be tied directly to the output of the

step-down regulator to increase efficiency.

Total quiescent current for the step-down converter and

LDO is a low 100μA under no load condition.

The AAT2749 is available in a Pb-free, space-saving

9-pin chip scale package (CSP) (200μm bump in 400μm

pitch) and is rated over the -40°C to +85°C temperature

range.

Typical Application

SystemPower

2749.2009.01.1.0

(1.62V - 5.5V)

(2.3V - 5.5V)

Fixed frequency, low noise

4.7μF

1.0μF

IN_BUCK

IN_LDO

IN_BUCK

CHIP_ENABLE

MODE

w w w . a n a l o g i c t e c h . c o m

AAT2749

3.0MHz Step-Down Converter and Low V

GND

OUT_BUCK

OUT_LDO

Features

• V

• Two Outputs

• Step-Down Converter

• LDO Regulator

• 100μA No Load Quiescent Current

• Over-Temperature Protection

• -40°C to +85°C Temperature Range

Applications

• Battery-Powered Applications

• Cellular and Smart Phones

• Digital Still and Video Cameras

• PDAs, Palmtops

• Portable Instruments

▪

Ultra-Small 0603 Inductor (Height 1mm)

Up to 92% Efficiency

3.0MHz Switching Frequency

MODE Selection Pin to Select Forced PWM or PWM/

LL Operation Mode

Current Limit Protection

Automatic Soft Start

300mA Output Current

Current Limit Protection

Range: 2.3V to 5.5V

OUT_BUCK

OUT_LDO

INL

Range: 1.62V to V

2.2μH

= 1.0V, 1.2V

= 1.8V

2.2μF

LDO

1.2V: 300mA

PRODUCT DATASHEET

4.7μF

BUCK

AAT2749

1.8V: 600mA

LDO

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