Datasheet > AAT2856INJ-EE-T1

AAT2856INJ-EE-T1

更新时间： 2024-01-17 12:09:58

品牌	Logo	应用领域
ANALOGICTECH		泵
页数	文件大小	规格书
22页	487K
描述
High Current Charge Pump with Dual LDO for BacklightApplications

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AAT2856INJ-EE-T1 技术参数

生命周期：	Transferred	包装说明：	,
Reach Compliance Code：	unknown	风险等级：	5.68
Base Number Matches：	1

AAT2856INJ-EE-T1 数据手册

AAT2856

High Current Charge Pump with

Dual LDO for BacklightApplications

™

ChargePump

General Description

Features

The AAT2856 is a highly integrated charge pump

with dual linear regulators optimized for systems

powered from lithium-ion/polymer batteries. The

charge pump provides power for white LED back-

light. Six backlight LEDs can be driven at up to

•

Input Voltage Range: 2.7V to 5.5V

Tri-Mode Charge Pump:

— Drives up to Six Backlight LEDs

— 32 Programmable Backlight Current

Settings Ranging from 115µA to 30mA

— 2MHz Switching Frequency

Two Linear Regulators:

30mA. AnalogicTech's AS Cwire™ (Advanced

Simple Serial Control™) single-wire interface is used

to enable, disable, and set the current to one of 32

levels for the backlight. Backlight current matching is

1% for uniform display brightness.

•

— 200mA Output Current

— 200mV Dropout Voltage

— Output Voltage Adjustable from 1.2V to

V_BATTERY

The AAT2856 offers two high-performance low-

noise MicroPower™ low dropout (LDO) linear regu-

lators. Both regulators use individual enable inputs

and each will supply up to 200mA load current. LDO

ground pin current is only 80µA, making the

AAT2856 ideal for battery-operated applications.

— Output Auto-Discharge for Fast Shutdown

— Individual LDO Enable Inputs

Built-In Thermal Protection

Automatic Soft Start

-40°C to +85°C Temperature Range

TQFN44-28 Package

•

The AAT2856 is equipped with built-in short-circuit

and over-temperature protection. The soft start cir-

cuitry prevents excessive inrush current at start-up

and mode transitions.

Applications

The AAT2856 is available in a Pb-free TQFN44-28

package and operates over the -40°C to +85°C

ambient temperature range.

•

Camera-Enabled Mobile Devices

Digital Still Cameras

Multimedia Mobile Phones

Typical Application

C₂

1μF

C₁

1μF

C1+ C1-

C2+ C2-

OUT

V_OUT

C_OUT

2.2μF

C_IN

4.7μF

WLEDs

V_BAT

OSRAM LW M673

or equivalent

BL1

BL2

BL3

BL4

BL5

BL6

AAT2856

ENABLE/SET

ENS

REF

OUTA

FBA

V_OUTA

R_2A

R_1A

C_BYP

0.1μF

C_OUTA

2.2μF

ENA

ENB

EN_LDOA

EN_LDOB

OUTB

FBB

V_OUTB

R_2B

R_1B

C_OUTB

2.2μF

AGND

PGND

2856.2007.06.1.0

12 3 4 5 6 7...22

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