AAT2856INJ-EE-T1 Advanced Analog Technology, Inc., AAT2856INJ-EE-T1 Datasheet

AAT2856INJ-EE-T1

Manufacturer Part Number

AAT2856INJ-EE-T1

Description

High Current Charge Pump with Dual LDO for Backlight Applications

Manufacturer

Advanced Analog Technology, Inc.

Datasheet

1.AAT2856INJ-EE-T1.pdf (18 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

AAT2856INJ-EE-T1

Manufacturer:

KEC

Quantity:

4 411

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General Description

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

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.

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.

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.

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

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

temperature range.

Typical Application

ChargePump

2856.2008.02.1.3

Cwire™ (Advanced Simple Serial Control™) single-

BAT

High Current Charge Pump with Dual LDO for Backlight Applications

ENABLE/SET

EN_LDOA

EN_LDOB

4.7μF

0.1μF

BYP

C1+ C1-

ENS

REF

ENA

ENB

AGND

1μF

AAT2856

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

C2+ C2-

PGND

1μF

OUTA

OUTB

FBA

FBB

OUT

BL1

BL2

BL3

BL4

BL5

BL6

Features

• Input Voltage Range: 2.7V to 5.5V

• Tri-Mode Charge Pump:

• Two Linear Regulators:

• Built-In Thermal Protection

• Automatic Soft Start

• -40°C to +85°C Temperature Range

• TQFN44-28 Package

Applications

• Camera-Enabled Mobile Devices

• Digital Still Cameras

• Multimedia Mobile Phones

▪

2.2μF

Drives up to Six Backlight LEDs

32 Programmable Backlight Current Settings

Ranging from 115μA to 30mA

2MHz Switching Frequency

200mA Output Current

200mV Dropout Voltage

Output Voltage Adjustable from 1.2V to V

Output Auto-Discharge for Fast Shutdown

Individual LDO Enable Inputs

OUT

2.2μF

OUT

OUTA

OUTB

OUTA

PRODUCT DATASHEET

OSRAM LW M673

or equivalent

WLEDs

AAT2856

BATTERY

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