Datasheet > AAT2856_08

AAT2856_08

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		泵
页数	文件大小	规格书
18页	399K
描述
High Current Charge Pump with Dual LDO for Backlight Applications

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AAT2856_08 数据手册

PRODUCT DATASHEET

AAT2856

ChargePump^TMHigh Current Charge Pump with Dual LDO for Backlight Applications

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 backlight. Six backlight

LEDs can be driven at up to 30mA. AnalogicTech’s

AS²Cwire™ (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.

• 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:

▪

200mA Output Current

200mV Dropout Voltage

Output Voltage Adjustable from 1.2V to V_BATTERY

Output Auto-Discharge for Fast Shutdown

▪

The AAT2856 offers two high-performance low-noise

MicroPower™ low dropout (LDO) linear regulators. Both

regulators use individual enable inputs and each will

supply up to 200mA load current. LDO ground pin cur-

rent is only 80μA, making the AAT2856 ideal for battery-

operated applications.

▪

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 circuitry pre-

vents excessive inrush current at start-up and mode

transitions.

Applications

• Camera-Enabled Mobile Devices

• Digital Still Cameras

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

age and operates over the -40°C to +85°C ambient

temperature range.

• 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

OSRAM LW M673

or equivalent

V_BAT

BL1

BL2

BL3

BL4

BL5

BL6

AAT2856

ENABLE/SET

ENS

REF

OUTA

FBA

V_OUTA

R_2A

C_BYP

0.1μF

C_OUTA

2.2μF

R_1A

ENA

EN_LDOA

EN_LDOB

OUTB

FBB

V_OUTB

R_2B

C_OUTB

ENB

2.2μF

R_1B

AGND

PGND

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

2856.2008.02.1.3

12 3 4 5 6 7...18

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