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AAT2504

Adjustable Three-Channel Regulator

DATA SHEET

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013

General Description

The AAT2504 is a three-channel regulator consisting of a

step-down converter with an input voltage range of 2.7V

to 5.5V plus two low dropout (LDO) linear regulators.

The two LDOs have an input voltage range of 1.8V to

5.5V, making them well-suited for post regulating from

the step-down converter.

The step-down converter optimizes power efficiency

throughout the load range. Pulling the MODE/SYNC pin

high enables “PWM Only” operation, maintaining con-

stant frequency and low output ripple across the operat-

ing range. Alternatively, the converter may be synchro-

nized to an external clock to the MODE/ SYNC pin. The

step-down converter delivers up to 800mA of output cur-

rent. The switching frequency is 2MHz, minimizing the

size of external components.

The two LDOs (LDOA/LDOB) have independent inputs

and are capable of delivering up to 300mA each. Ultra

low input voltage on the VLDOA and VLDOB pins (down

to 1.62V) allows for efficient post-buck regulation. A

Power-OK (POK) function provides an open drain output

signal when LDOA is within regulation. Both LDOs feature

low quiescent current and a low dropout voltage. The

output voltages for both LDOs are adjustable to as low as

0.6V. The linear regulators have independent Enable pins.

Typical no load quiescent current is a low 80μA when the

step-down converter and LDOs are enabled.

The AAT2504 is available in a Pb-free 3x4mm QFN34-20

package and is rated over the -40°C to +85°C tempera-

ture range.

Features

• 800mA Buck Converter

• Two 300mA Linear Regulators

• Independent Enable Pins

• Over-Temperature Protection

• QFN34-20 Package

• -40°C to +85°C Temperature Range

Applications

• Cellular Phones

• Digital Cameras

• Handheld Instruments

• Microprocessor/DSP Core/IO Power

• PDAs and Handheld Computers

Typical Application

AAT2504

2.2

μF

OUTA

OUTB

POK

POK

OUTA

OUTB

AGND

VLDOA

VLDOB

LX

FB

L

V

PGND

VIN

VP

FBB

C

OUT

FBA

2.2

μF

ENB

EN

ENA

V

IN

100k

Ω

MODE/SYNC