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AAT2856

High Current Charge Pump with

Dual LDO for BacklightApplications

General Description

The AAT2856 is a highly integrated charge pump

with dual linear regulators optimized for systems

powered from lithium-ion/polymer batteries. The

charge pump provides power for white LED back-

light. Six backlight LEDs can be driven at up to

30mA. AnalogicTech's AS

2

Cwire鈩?(Advanced

Simple Serial Control鈩? single-wire interface is used

to enable, disable, and set the current to one of 32

levels for the backlight. Backlight current matching is

1% for uniform display brightness.

The AAT2856 offers two high-performance low-

noise MicroPower鈩?low dropout (LDO) linear regu-

lators. Both regulators use individual enable inputs

and each will supply up to 200mA load current. LDO

ground pin current is only 80碌A, making the

AAT2856 ideal for battery-operated applications.

The AAT2856 is equipped with built-in short-circuit

and over-temperature protection. The soft start cir-

cuitry prevents excessive inrush current at start-up

and mode transitions.

The AAT2856 is available in a Pb-free TQFN44-28

package and operates over the -40擄C to +85擄C

ambient temperature range.

Features

鈥?/div>

ChargePump

鈩?/div>

鈥?/div>

Input Voltage Range: 2.7V to 5.5V

Tri-Mode Charge Pump:

鈥?Drives up to Six Backlight LEDs

鈥?32 Programmable Backlight Current

Settings Ranging from 115碌A to 30mA

鈥?2MHz Switching Frequency

Two Linear Regulators:

鈥?200mA Output Current

鈥?200mV Dropout Voltage

鈥?Output Voltage Adjustable from 1.2V to

V

BATTERY

鈥?Output Auto-Discharge for Fast Shutdown

鈥?Individual LDO Enable Inputs

Built-In Thermal Protection

Automatic Soft Start

-40擄C to +85擄C Temperature Range

TQFN44-28 Package

Applications

鈥?/div>

Camera-Enabled Mobile Devices

Digital Still Cameras

Multimedia Mobile Phones

Typical Application

C

1

1渭F

C1+ C1-

IN

C

IN

4.7渭F

C

2

1渭F

C2+ C2-

OUT

C

OUT

2.2渭F

IN

BL1

BL2

BL3

BL4

BL5

BL6

OUTA

C

BYP

0.1渭F

REF

FBA

R

1A

R

2A

C

OUTA

2.2渭F

V

OUTA

V

OUT

V

BAT

WLEDs

OSRAM LW M673

or equivalent

AAT2856

ENABLE/SET

ENS

EN_LDOA

EN_LDOB

ENA

ENB

AGND

OUTB

R

2B

FBB

PGND

R

1B

V

OUTB

C

OUTB

2.2渭F

2856.2007.06.1.0

1

型號

版本

描述

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