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AAT2846INJ-EE-T1

更新时间： 2025-07-25 03:06:07

品牌	Logo	应用领域
ANALOGICTECH		驱动程序和接口接口集成电路泵
页数	文件大小	规格书
25页	646K
描述
High Current Charge Pump with Dual LDO for Backlight and Flash Applications

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中文翻译

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AAT2846INJ-EE-T1 数据手册

AAT2846

High Current Charge Pump with Dual LDO

for Backlight and Flash Applications

™

ChargePump

General Description

Features

The AAT2846 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 both white LED

backlight and flash. Six backlight LEDs can be driv-

en at up to 30mA each, while up to two flash LEDs

can be driven at up to 600mA total. AnalogicTech's

•

Input Voltage Range: 2.7V to 5.5V

Tri-Mode Charge Pump:

— Drives up to Six Backlight LEDs and Two

Flash LEDs

— 32 Programmable Backlight Current

Settings Ranging from 95µA to 30mA

— 16 Programmable Flash Current Settings

— Maximum Flash LED Current

Programmable using External Resistor

— 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

— Individual LDO Enable Inputs

Built-In Thermal Protection

Automatic Soft Start

-40°C to +85°C Temperature Range

TQFN44-28 Package

AS Cwire™ (Advanced Simple Serial Control™) sin-

gle-wire interface is used to enable, disable, and set

the current to one of 32 levels for the backlight and

one of 16 levels for the flash. An external resistor sets

the maximum flash current. Backlight current match-

ing is 1% for uniform display brightness, and flash

current matching is 4% for uniform power dissipation.

•

The AAT2846 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

AAT2846 ideal for battery-operated applications.

•

The AAT2846 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 AAT2846 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

C₁

1μF

C₂

1μF

C1+

C1- C2+

C2-

V_OUT

OUT

C_OUT

2.2μF

C_IN

4.7μF

V_BAT

AAT2846

BL1

BL2

BL3

BL4

BL5

BL6

FL1

FL2

ENABLE/SET

ENS

FEN

EN_FLASH

C_T

0.1μF

FSET

R_FSET

280k

OUTA

V_OUTLDOA

REF

R_2A

R_1A

C_OUTA

C_BYP

0.1μF

FBA

V_OUTLDOB

C_OUTB

OUTB

FBB

ENA

ENB

EN_LDOA

EN_LDOB

R_2B

R_1B

AGND PGND

2846.2007.08.1.0

12 3 4 5 6 7...25

中文翻译

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