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PRODUCT DATASHEET

AAT2846

ChargePump

TM

High Current Charge Pump with Dual LDO for Backlight and Flash Applications

Features

鈥?Input Voltage Range: 2.7V to 5.5V

鈥?Tri-Mode Charge Pump:

鈻?/div>

Drives up to Six Backlight LEDs and Two Flash LEDs

鈻?/div>

32 Programmable Backlight Current Settings

Ranging from 95碌A(chǔ) to 30mA

鈻?/div>

16 Programmable Flash Current Settings

鈻?/div>

Maximum Flash LED Current Programmable using

External Resistor

鈻?/div>

2MHz Switching Frequency

鈥?Two Linear Regulators:

鈻?/div>

200mA Output Current

鈻?/div>

200mV Dropout Voltage

鈻?/div>

Output Voltage Adjustable from 1.2V to V

BATTERY

鈻?/div>

Output Auto-Discharge for Fast Shutdown

鈻?/div>

Individual LDO Enable Inputs

鈥?Built-In Thermal Protection

鈥?Automatic Soft Start

鈥?-40擄C to +85擄C Temperature Range

鈥?TQFN44-28 Package

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 driven at up to 30mA each,

while up to two flash LEDs can be driven at up to 600mA

total. AnalogicTech鈥檚 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

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

sets the maximum flash current. Backlight current

matching 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 regulators. Both

regulators use individual enable inputs and each will

supply up to 200mA load current. LDO ground pin cur-

rent 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 circuitry pre-

vents excessive inrush current at start-up and mode

transitions.

The AAT2846 is available in a Pb-free TQFN44-28 pack-

age and operates over the -40擄C to +85擄C ambient

temperature range.

Applications

鈥?Camera-Enabled Mobile Devices

鈥?Digital Still Cameras

鈥?Multimedia Mobile Phones

Typical Application

C

1

1碌F

C

2

1碌F

C1+

C1- C2+

C2-

V

OUT

IN

V

BAT

OUT

C

IN

4.7碌F

ENABLE/SET

EN_FLASH

IN

AAT2846

BL1

BL2

BL3

BL4

BL5

BL6

FL1

FL2

OUTA

C

OUT

2.2碌F

ENS

FEN

CT

FSET

C

T

0.1碌F

R

FSET

280k

C

BYP

0.1碌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

2846.2008.03.1.1

www.analogictech.com

1

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