AAT2845IML-QG-T1 Advanced Analogic Technologies, Inc., AAT2845IML-QG-T1 Datasheet

AAT2845IML-QG-T1

Manufacturer Part Number

AAT2845IML-QG-T1

Description

Manufacturer

Advanced Analogic Technologies, Inc.

Datasheets

1.AAT2845.pdf (19 pages)

2.AAT2845IML-QG-T1.pdf (19 pages)

3.AAT2845IML-QG-T1.pdf (19 pages)

Specifications of AAT2845IML-QG-T1

Date_code

07+

Packing_info

TQFN34-20

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

AAT2845IML-QG-T1

Manufacturer:

analogic

Quantity:

188

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General Description

The AAT2845 is a highly integrated power solution for

single-cell lithium-ion-based LCD display applications. It

includes a four-channel LED backlight driver and two

integrated 200mA LDOs as additional power supplies for

display and camera-related chipsets.

The backlight driver is a low noise, constant frequency

charge pump DC/DC converter that uses a tri-mode load

switch (1X), fractional (1.5X), and doubling (2X) conver-

sion to maximize efficiency. Each of the four channels is

capable of driving up to 20mA per channel.

AnalogicTech’s S

digital input is used to enable, disable, and set current

for each LED with 16 available settings down to 50µA.

The low current mode supply current can be as low as

50µA to save power and maintain high efficiency.

Each LED output is equipped with built-in protection for

short-circuit and auto-disable functions. Built-in soft-

start circuitry prevents excessive inrush current during

start-up. A low current shutdown feature disconnects the

load from the input and reduces quiescent current to less

than 1µA.

The AAT2845 is available in a Pb-free, thermally-

enhanced 20-pin 3x4mm TQFN package.

Typical Application

3.6V

ChargePump

2845.2008.05.1.2

BAT

Backlight Control

LDO Enable

Cwire

2.2µF

0.1µF

BYP

Cwire™ (Simple Serial Control™) serial

EN/SET

ENLDO

CBP

C1-

AAT2845-EE

CF1

1µF

GND/PGND

C1+ C2-

CF2

1µF

LDOA

LDOB

OUT

FBA

FBB

C2+

1µF

OUT

2.2µF

OSRAM LW M673

200mA

OUTA

OUTB

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

or equivalent

WLEDs

Four-Channel Backlight Driver with Dual LDOs

3.6V

Features

• Input Voltage Range: 2.7V to 5.5V

• Four-Channel LED Driver:

• Dual, 200mA LDOs

• Automatic Soft-Start

• Over-Temperature Protection

• Available in 3x4mm TQFN34-20 Package

• -40°C to +85°C Temperature Range

Applications

• Camera Function Power Supplies

• Camera Phone Displays

• LCD Modules

• White LED Backlighting

BAT

Backlight Control

▪

LDO Enable

Tri-Mode Charge Pump

Up to 20mA/Channel

Easy Control with Single Wire Interface

16 Current Levels

Four Low Current Settings Down to 50µA

Low I

>90% Peak Efficiency

User-Programmable Outputs: AAT2845-EE

Fixed Output Voltages

• AAT2845-QG: 2.8V and 1.5V

• AAT2845-QI: 2.8V and 1.8V

Cwire

2.2µF

0.1µF

(50µA) for Low Current Mode

BYP

EN/SET

ENLDO

CBP

C1-

AAT2845-QI

CF1

1µF

PRODUCT DATASHEET

GND/PGND

C1+ C2-

CF2

1µF

LDOA

LDOB

OUT

C2+

AAT2845

1µF

2.2µF

OUT

OUTA

OUTB

2.8V, 200mA

1.8V, 200mA

OUTA

OUTB

OSRAM LW M673

or equivalent

WLEDs

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