AAT2848 Analogic Corporation, AAT2848 Datasheet

AAT2848

Manufacturer Part Number

AAT2848

Description

Manufacturer

Analogic Corporation

Datasheet

1.AAT2848.pdf (19 pages)

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General Description

The AAT2848 is a tri-mode charge pump optimized for

systems operating with lithium-ion/polymer batteries. The

charge pump provides power for both white LED backlight

and flash, with an integrated four channel backlight LED

current sink plus two channel flash LED current sinks.

Each backlight channel can drive up to 30mA, while each

flash current sink/channel can drive up to 300mA (600mA

total). Two independent S

Serial Control™) serial digital interface inputs enable,

disable, and set LED current to one of 32 levels for the

backlight and to one of 16 levels for the flash, with full-

scale current independently set for backlight and flash

using external resistors.

The AAT2848 offers a built-in fade-in/out function for

linear control of the backlight current during ON/OFF

transitions. The fade time is programmable by an exter-

nal capacitor.

The AAT2848 also offers a built-in flash timeout function

as a safety feature associated with the high power flash

driver. The safety timer is also programmable via an

external capacitor.

The AAT2848 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 AAT2848 is available in a Pb-free, space

saving TQFN33-20 package and operates over the -40°C

to +85°C ambient temperature range.

Typical Application

ChargePump

2848.2008.05.1.0

High-Current Charge Pump For Backlight Display and Flash Applications

Cwire™ (AnalogicTech’s Simple

Backlight Control

Flash Control

BAT

330nF

Cwire

FLTMR

15k

BSET

4.7μF

47nF

14.3k

FADE

FSET

w w w . a n a l o g i c t e c h . c o m

C1- C1+ C2- C2+

FLTMR

BENS

FENS

BSET

FSET

FADE

AGND

1μF

AAT2848

PGND

1μF

OUT

BL1

BL2

BL3

BL4

FL1

FL2

Features

• Tri-Mode (1x/1.5x/2x) Charge Pump

• Four 30mA Backlight LED Channels

• Independent S

• 32-Level Programmable Backlight Current Control—

• Two 300mA Flash LED Channels

• Independent S

• 16-Level Programmable Flash Current Control—

• User-Programmable Full Scale Current for Backlight

• User-Programmable Fade-In/Fade-Out Function for

• User-Programmable Safety Timer for Flash LED

• Built-In Thermal Protection

• Automatic Soft-Start

• -40°C to +85°C Temperature Range

• Available in TQFN33-20 Package

Applications

• Camera Enabled Mobile Devices

• Digital Still Cameras

• Multimedia Mobile Phones

2.2μF

OUT

OSRAM LW M673

Linear, Inverting

and Flash

Backlight

Protection

or equivalent

WLEDs

Cwire Control for Backlight

Cwire Control for Flash

Lumileds PWF1

or equivalent

Flash LEDs

PRODUCT DATASHEET

AAT2848

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