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1MHz Step-Down Converter/LDO Regulator

General Description

The AAT2500 is a member of AnalogicTech's Total

Power Management IC鈩?(TPMIC鈩? product fam-

ily. It is a low dropout (LDO) linear regulator and a

step-down converter with an input voltage range of

2.7V to 5.5V, making it ideal for applications with

single lithium-ion/polymer batteries.

The LDO has an independent input and is capable

of delivering up to 300mA. 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 fea-

tures include low quiescent current and a low

dropout voltage.

The 400mA step-down converter is designed to

minimize external component size and cost while

maintaining a low 25碌A no load quiescent current.

Peak current mode control with internal compen-

sation provides a stable converter with a low equiv-

alent series resistance (ESR) ceramic output

capacitor for extremely low output ripple.

For maximum battery life, the step-down converter

increases to 100% duty cycle and has a typical

180mV dropout voltage at 400mA. The output volt-

age is either fixed or adjustable with an integrated

P- and N-channel MOSFET power stage and

1MHz switching frequency.

The AAT2500 is available in a 12-pin TDFN33 or

STDFN33 package, and is rated over a tempera-

ture range of -40掳C to +85掳C.

AAT2500

Features

鈥?/div>

SystemPower

鈩?/div>

V

IN

Range: 2.7V to 5.5V

300mA LDO Current Output

400mV LDO Dropout Voltage at 300mA

High Output Accuracy: 卤1.5%

Fast LDO Line / Load Transient Response

400mA, 96% Efficiency Step-Down Converter

25碌A No Load Quiescent Current for Step-

Down Converter

Shutdown Current <1碌A

Low R

DS(ON)

0.4惟 Integrated Power Switches

Low Dropout 100% Duty Cycle

1MHz Switching Frequency

Internal Soft Start

Over-Temperature Protection

Current Limit Protection

Available in TDFN33-12 or STDFN33-12

Package

-40掳C to +85掳C Temperature Range

Applications

鈥?/div>

Cellular Phones

Digital Cameras

Handheld Instruments

Microprocessor/DSP Core/IO Power

PDAs and Handheld Computers

Portable Media Players

Typical Application

V

IN

= 2.7V to 5.5V

AAT2500 Step-Down Converter Efficiency

VP

VLDO

ENLDO

OUT

BYP

GND

VCC

EN

LX

FB

SGND

PGND

4

10

C3

10渭F

3

5

100

2.5V at 400mA

95

2.5V

1.8V

9

6

7

8

2

11

12

1

4.7渭H

Efficiency (%)

3.3V at 300mA

L1

90

85

80

75

70

65

60

0.1

1

10

100

C4

2.2渭F

C1

4.7渭F

C5

10nF

U1

AAT2500

V

IN

= 3.3V

1000

L1 Sumida CDRH3D16-4R7 C1 Murata GRM219R61A475KE19

C3 Murata GRM21BR60J106KE19

Load Current (mA)

2500.2006.05.1.16

1

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