Datasheet > AAT2847_08

AAT2847_08

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		驱动器
页数	文件大小	规格书
20页	701K
描述
Four-Channel Backlight Driver with Dual LDOs

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AAT2847_08 数据手册

PRODUCT DATASHEET

AAT2847

ChargePump^TM

Four-Channel Backlight Driver with Dual LDOs

General Description

Features

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.

• Input Supply Voltage Range: 2.7V to 5.5V

• Tri-Mode (1X/1.5X/2X) Charge Pump:

Delivers up to 120mA of Output Current

• Integrated LCD Display Solution:

▪

Four-Channel WLED Backlight

• User-Programmable WLED Current Scales: 30mA,

20mA and 15mA.

▪

Sixteen Programmable Current Level Settings

• User Selectable Low Level Current Scale

▪

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.

Four Programmable Current Level Settings

▪

Dual 200mA LDOs (w/Separate Enables)

• Single-WireAS²CwireSerialInterfaceforConfiguration/

Control

Four Addressable Registers

Fast, 1MHz Serial Interface

• > 90% Peak Efficiency

• LDO Output Voltages:

▪

AnalogicTech’s AS²Cwire™ (Advanced Simple Serial

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.

AAT2847-EE: User-Programmable

AAT2847-QG: 2.8V and 1.5V

AAT2847-QI: 2.8V and 1.8V

▪

• Over-Temperature Protection

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

• -40°C to +85°C Temperature Range

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.

Applications

• Camera Function Power Supplies

• Camera Phone Displays

• LCD Modules

The AAT2847 is available in the thermally enhanced

20-pin 3x4x0.75mm TQFN package.

• White LED Backlighting

Typical Application

1µF

C1- C1+ C2- C2+

OUT

C1- C1+ C2- C2+

OUT

WLEDs

OSRAM LW M673

or equivalent

C_OUT

1µF

or equivalent

C_OUT

1µF

AAT 2847-EE

AAT2847-QI

V_BAT

3.6V

V_BAT

3.6V

C_IN

2.2µF

C_IN

2.2µF

200mA

V_OUTA

LDOA

2.8V, 200mA

C_LDOA

2.2µF

AS²Cwire

Backlight control

C_LDOA

2.2µF

EN/SET

FBA

AS²Cwire

EN/SET

ENA

ENB

LDO A Enable

LDO B Enable

Backlight Control

LDO A Enable

LDO B Enable

200mA

V_OUTB

1.8V, 200mA

LDOB

PGND

LDOB

ENA

ENB

C_LDOB

2.2µF

C_LDOB

2.2µF

GND

FBB

GND

PGND

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

2847.2008.05.1.2

12 3 4 5 6 7...20

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与AAT2847_08相关器件

型号	品牌	描述	获取价格	数据表
AAT2847IML-EE-T1	ANALOGICTECH	Four-Channel Backlight Driver with Dual LDOs	获取价格
AAT2847IML-QG-T1	ANALOGICTECH	Four-Channel Backlight Driver with Dual LDOs	获取价格
AAT2847IML-QI-T1	ANALOGICTECH	Four-Channel Backlight Driver with Dual LDOs	获取价格
AAT2848	ANALOGICTECH	High-Current Charge Pump For Backlight Display and Flash Applications	获取价格
AAT2848IDG-T1	ANALOGICTECH	High-Current Charge Pump For Backlight Display and Flash Applications	获取价格
AAT2856	ANALOGICTECH	High Current Charge Pump with Dual LDO for BacklightApplications	获取价格

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