AAT2842 Analogic Corporation, AAT2842 Datasheet

AAT2842

Manufacturer Part Number

AAT2842

Description

Manufacturer

Analogic Corporation

Datasheet

1.AAT2842.pdf (21 pages)

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General Description

The AAT2842 is a highly integrated charge pump

with dual linear regulators optimized for systems

operating with lithium-ion/polymer batteries. The

charge pump provides power for both white LED

backlight/keypad and flash. Up to four backlight

LEDs can be driven at up to 30mA each and key-

pad LEDs can be driven using lower currents set by

the S

LEDs can be driven with up to 600mA total. Two

separate S

digital interfaces are used to enable, disable, and

set the current to one of 16 levels for both backlight

and flash LEDs. Backlight/keypad and flash current

settings are also controlled through external resis-

tors for increased versatility with reduced accuracy

and matching. Backlight/keypad current matching

is 1% for uniform display brightness, and flash cur-

rent matching is 4% for uniform power dissipation.

An integral flash timer set by an external capacitor

protects the flash LED should a fault occur.

The AAT2842 offers two high-performance

MicroPower™ low dropout (LDO) linear regulators.

A single enable input controls both regulators and

each supplies up to 200mA to the load. Both LDOs

consume only 85µA quiescent current, making

them ideal for battery-operated applications.

The AAT2842 is equipped with built-in short-circuit

and over-temperature protection. The charge pump

soft-start circuitry prevents excessive inrush current

at start-up. The product is available in a Pb-free,

space-saving TQFN44-28 package and operates

over the -40°C to +85°C ambient temperature range.

Typical Application

2842.2006.10.1.0

Cwire interface. In addition, up to four flash

Cwire™ (Simple Serial Control™) serial

BAT

SET1

SET2

EN_BACKLIGHT

REF

EN_FLASH

EN_LDO

4.7µF

Control and Dual LDO for Backlight and Flash

High-Current Charge Pump with S

BENS

BSET

FSET

REF

ENL

FENS

C1+

AGND

1µF

AAT2842

C1- C2+

PGND

1µF

OUTA

OUTB

FBA

FBB

OUT

BL1

BL2

BL3

BL4

FL1

FL2

FL3

FL4

C2-

Features

•

Applications

•

2.2µF

OUT

Tri-Mode Charge Pump:

— Drives up to Four Backlight/Keypad and

— Separate S

— Backlight/Keypad and Flash Current Set

— Flash Timer Set with External Capacitor

— Up to 2MHz Switching Frequency

Two Linear Regulators:

— 200mA Output Current

— 200mV Dropout

— Output Voltage Adjustable from 1.2V to

— Output Auto-Discharge for Fast Shutdown

— 85µA Quiescent Current

Built-In Thermal Protection

Automatic Soft Start

-40°C to +85°C Temperature Range

Available in 4x4mm TQFN44-28 Package

Camera-Enabled Mobile Devices

Digital Still Cameras

Multimedia Mobile Phones

Range: 2.7V to 5.5V

Four Flash LEDs

Backlight/Keypad and Flash Currents

by Separate External Resistors

BATTERY

OUTB

OUT

LDOB

Cwire Control for

ChargePump

OUTA

OUT

LDOA

Cwire™

™

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