1

AAT2505

Dual Channel, Step-Down Converter/Linear Regulator

DATA SHEET

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

202018B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013

General Description

The AAT2505 is a member of Skyworks' Total Power

Management IC (TPMIC™) product family. It is a low

dropout (LDO) linear regulator and a step-down con-

verter with an input voltage range of 2.7V to 5.5V, mak-

ing it ideal for applications with single cell lithium-ion /

polymer batteries.

The LDO has an independent input pin and is capable of

delivering up to 300mA of current. The linear regulator

has been designed for high-speed turn-on and turn-off

performance, fast transient response, and good power

supply rejection ratio (PSRR). Other features include low

quiescent current, low dropout voltage, and a Power-OK

tion.

The 600mA step-down converter is designed to operate

with 1.4MHz of switching frequency, minimizing external

component size and cost while maintaining a low 27μA

no load quiescent current.

Peak current mode control with internal compensation

provides a stable converter with a low equivalent series

resistance (ESR) ceramic output capacitor for extremely

low output ripple.

For maximum battery life with high voltage outputs, the

step-down converter duty cycle increases to 100%. The

output voltage is either fixed or adjustable with an inte-

grated P- and N-channel MOSFET power stage and

1.4MHz switching frequency.

The AAT2505 is available in a Pb-free, 12-pin TDFN33

package and is rated over a temperature range of -40°C

to +85°C.

Features

• V

• 300mA LDO

• 600mA Step-Down Converter

• Over-Temperature and Current Limit Protection

• TDFN33-12 Package

• -40°C to +85°C Temperature Range

Applications

• Cellular Phones

• Digital Cameras

• Handheld Instruments

• Microprocessor/DSP Core/IO Power

• PDAs and Handheld Computers

• Portable Media Players

Typical Application

6.8μH

L1

C1

4.7μF

2.2μF

C4

10μF

C3

R3 100k

Ω

PGND

1

LX

2

VP

3

VCC

4

ENLDO

9

EN

10

FB

11

SGND

12

VLDO

5

OUT

6

GND

8

POK

7

AAT2505

U1

L1 Sumida CDRH3D16-4R7

C1 Murata GRM219R61A475KE19

C3 Murata GRM21BR60J106KE19

3.3V at 300mA

2.5V at 600mA

Efficiency

Output Current (mA)

60

70

80

90

100

0.1

1

10

100

1000