AAT2847IML-QG-T1 Advanced Analog Technology, Inc., AAT2847IML-QG-T1 Datasheet

AAT2847IML-QG-T1

Manufacturer Part Number

AAT2847IML-QG-T1

Description

Four-Channel Backlight Driver with Dual LDOs

Manufacturer

Advanced Analog Technology, Inc.

Datasheet

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General Description

The AAT2847 is a highly integrated power solution for

single cell Li-Ion/Polymer based liquid crystal display

(LCD) display applications. It includes a four channel

light emitting diode (LED) backlight driver and two inte-

grated 200mA low dropout voltage regulators (LDOs) as

additional power supplies for display and camera related

chipsets.

The backlight driver in the AAT2847 is a low noise tri-

mode DC/DC charge pump converter. Each of the four

channels of the backlight driver is capable of delivering

up to 20mA of bias currents for white LEDs. The white

LED (WLED) backlight bias current matching is 1% which

helps provide uniform display brightness.

AnalogicTech’s AS

Control™) serial digital interface is used to enable, dis-

able, and set the current for each backlight LED channel.

Each LED channel has sixteen available current level set-

tings in three separate current scales, plus four available

current level settings on a low level current scale.

Each LED channel is equipped with built-in short circuit

protection and auto disable functionality. A low shutdown

current feature disconnects the load from the input and

reduces quiescent current to less than 1µA.

The AAT2847 is available in the thermally enhanced

20-pin 3x4x0.75mm TQFN package.

Typical Application

ChargePump

2847.2008.05.1.2

3.6V

Backlight Control

BAT

LDO A Enable

LDO B Enable

Cwire

2.2µF

Cwire™ (Advanced Simple Serial

EN/SET

C1- C1+ C2- C2+

ENA

ENB

GND

1µF

AAT 2847-EE

1µF

PGND

LDOA

LDOB

OUT

FBA

FBB

1µF

OUT

200mA

2.2µF

LDOA

LDOB

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

OSRAM LW M673

or equivalent

WLEDs

Four-Channel Backlight Driver with Dual LDOs

Backlight control

3.6V

LDO A Enable

LDO B Enable

Features

• Input Supply Voltage Range: 2.7V to 5.5V

• Tri-Mode (1X/1.5X/2X) Charge Pump:

• Integrated LCD Display Solution:

• Single-Wire AS

• > 90% Peak Efficiency

• LDO Output Voltages:

• Over-Temperature Protection

• Available in 3x4x0.75mm TQFN34-20 Package

• -40°C to +85°C Temperature Range

Applications

• Camera Function Power Supplies

• Camera Phone Displays

• LCD Modules

• White LED Backlighting

BAT

Cwire

▪

Control

▪

Delivers up to 120mA of Output Current

Four-Channel WLED Backlight

• User-Programmable WLED Current Scales: 30mA,

• User Selectable Low Level Current Scale

Dual 200mA LDOs (w/Separate Enables)

Four Addressable Registers

Fast, 1MHz Serial Interface

AAT2847-EE: User-Programmable

AAT2847-QG: 2.8V and 1.5V

AAT2847-QI: 2.8V and 1.8V

2.2µF

20mA and 15mA.

▪

Sixteen Programmable Current Level Settings

Four Programmable Current Level Settings

EN/SET

C1- C1+ C2-

ENA

ENB

GND

1µF

AAT 2847-QI

Cwire Serial Interface for Configuration/

PRODUCT DATASHEET

1µF

PGND

LDOA

LDOB

OUT

C2+

1µF

2.2µF

AAT2847

OUT

LDOA

LDOB

2.8V, 200mA

1.8V, 200mA

OUTA

OUTB

OSRAM LW M673

or equivalent

WLEDs

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