AAT2505 Analogic Corporation, AAT2505 Datasheet

AAT2505

Manufacturer Part Number

AAT2505

Description

Manufacturer

Analogic Corporation

Datasheet

1.AAT2505.pdf (26 pages)

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General Description

The AAT2505 is a member of AnalogicTech's Total

Power Management IC™ (TPMIC™) 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 cell lithium-ion / polymer batteries.

The LDO has an independent input pin and is capa-

ble 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 (POK) open drain

output signaling when V

The 600mA step-down converter is designed to

operate with 1.4MHz of switching frequency, mini-

mizing external component size and cost while

maintaining a low 27µA 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 with high voltage outputs,

the step-down converter duty cycle increases to

100%. The output voltage is either fixed or adjustable

with an integrated 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.

Typical Application

2505.2006.06.1.1

2.2µF

3.3V at 300mA

10µF

L1 Sumida CDRH3D16-4R7

R3 100kΩ

= 2.7V to 5.5V

C3 Murata GRM21BR60J106KE19

VLDO

ENLDO

OUT

POK

GND

AAT2505

OUT

C1 Murata GRM219R61A475KE19

SGND

PGND

is in regulation.

VCC

6.8µH

2.5V at 600mA

4.7µF

Features

•

Applications

•

300mA LDO

— 400mV Dropout Voltage at 300mA

— High Accuracy: ±1.5%

— Fast Line / Load Transient Response

— Power OK Output

600mA Step-Down Converter

— Up To 98% Efficiency

— 27µA No Load Quiescent Current

— Shutdown Current <1µA

— Low R

— Fast Turn-On Time (150µs Typical)

— Low Dropout 100% Duty Cycle

— 1.4MHz Switching Frequency

— Internal Soft Start

Over-Temperature and Current Limit

Protection

TDFN33-12 Package

-40°C to +85°C Temperature Range

Cellular Phones

Digital Cameras

Handheld Instruments

Microprocessor/DSP Core/IO Power

PDAs and Handheld Computers

Portable Media Players

100

0.1

Range: 2.7V to 5.5V

Converter/Linear Regulator

Dual Channel, Step-Down

DS(ON)

= 3.3V

OUT

Output Current (mA)

Integrated Power Switches

Efficiency

= 2.5V; L = 6.8µH)

SystemPower

100

1000

™

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