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AAT2846

High Current Charge Pump with Dual LDO

for Backlight and Flash Applications

General Description

The AAT2846 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 both white LED

backlight and flash. Six backlight LEDs can be driv-

en at up to 30mA each, while up to two flash LEDs

can be driven at up to 600mA total. AnalogicTech's

AS

2

Cwire鈩?(Advanced Simple Serial Control鈩? sin-

gle-wire interface is used to enable, disable, and set

the current to one of 32 levels for the backlight and

one of 16 levels for the flash. An external resistor sets

the maximum flash current. Backlight current match-

ing is 1% for uniform display brightness, and flash

current matching is 4% for uniform power dissipation.

The AAT2846 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(chǔ), making the

AAT2846 ideal for battery-operated applications.

The AAT2846 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 AAT2846 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 and Two

Flash LEDs

鈥?32 Programmable Backlight Current

Settings Ranging from 95碌A(chǔ) to 30mA

鈥?16 Programmable Flash Current Settings

鈥?Maximum Flash LED Current

Programmable using External Resistor

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

C

2

1渭F

C1+

C1- C2+

C2-

V

OUT

IN

V

BAT

OUT

C

IN

4.7渭F

ENABLE/SET

EN_FLASH

IN

AAT2846

BL1

BL2

BL3

BL4

BL5

BL6

FL1

FL2

OUTA

C

OUT

2.2渭F

ENS

FEN

CT

FSET

C

T

0.1渭F

R

FSET

280k

C

BYP

0.1渭F

REF

V

OUT

LDOA

R

2A

C

OUTA

FBA

R

1A

ENA

ENB

AGND

OUTB

R

2B

FBB

PGND

R

1B

EN_LDOA

EN_LDOB

V

OUT

LDOB

C

OUTB

2846.2007.08.1.0

1

型號

版本

描述

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