AAT2801IXN-4.5-T1 AnalogicTech, AAT2801IXN-4.5-T1 Datasheet

AAT2801IXN-4.5-T1

Manufacturer Part Number

AAT2801IXN-4.5-T1

Description

Multi-Mode Charge Pump for White LED Backlight and Flash Applications

Manufacturer

AnalogicTech

Datasheet

1.AAT2801IXN-4.5-T1.pdf (20 pages)

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General Description

The AAT2801 is a member of AnalogicTech's Total

Power Management IC™ (TPMIC™) product family.

It has a dual charge pump architecture designed to

support both the white LED backlight and flash appli-

cations for systems operating with Lithium-Ion bat-

teries. The backlight charge pump provides power

required to drive up to four LEDs. To maximize

power efficiency, it automatically selects 1X, 1.5X, or

2X mode. The device produces current levels up to

30mA on each of its four current source outputs.

AnalogicTech's Simple Serial Control™ (S

interface is used to enable, disable, and set the LED

drive current with a 32-level logarithmic scale LED

brightness control.

The flash charge pump is a charge pump doubler

with a regulated output voltage. It is designed to

deliver 120mA of continuous current and up to

250mA of pulsed current. It has an independent

enable pin for improved power savings.

The AAT2801 is equipped with AnalogicTech’s

AutoBias™ technology which allows individual LEDs

to be powered either by charge pump or battery

input, determined internally and automatically to

maximize the power efficiency even with a large dif-

ference in LED forward voltage.

The AAT2801 has thermal protection and built-in

soft-start circuitry. A high charge pump switching fre-

quency enables the use of very small external capac-

itors.

TDFN44 package.

Typical Application

2801.2006.04.1.3

The AAT2801 is available in the 16-pin

Flash Enable

1μF

EN/SET

1μF

EN/SET

EN_FLSH

Cwire™)

White LED Backlight and Flash Applications

1μF

AAT2801

GND

1μF

OUT_FLSH

1μF

Features

•

Applications

•

Dual Charge Pump

— Flash: Charge Pump Doubler

— Backlight: Tri-Mode Charge Pump

Drives Low-V

Up to Four 30mA Outputs

32-Position Logarithmic Scale with Digital

Control

Low Noise Constant Frequency Operation

1MHz Switching Frequency

AutoBias Technology

Regulated 4.5/5.0 Volts V

Up to 250mA of Current for Flash

Automatic Soft Start

No Inductors

Available in 16-pin TDFN44 Package

Display Modules

Mobile Phones

PDAs

Smart Phones

<1µA in Shutdown

Multi-Mode Charge Pump for

Range: 2.7V to 5.5V

1μF

Flash LED

and High-V

Backlight

ChargePump

OUT_FLASH

LEDs

™

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