Datasheet > AAT2803

AAT2803

更新时间： 2024-01-16 01:06:55

品牌	Logo	应用领域
AAT		光电泵
页数	文件大小	规格书
16页	613K
描述
Six-Channel White LED Backlight Charge Pump with Flash

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AAT2803 数据手册

AAT2803

Six-Channel White LED Backlight

Charge Pump with Flash

™

ChargePump

General Description

Features

TheAAT2803 is a dual charge pump designed to sup-

port both white LED backlight and flash applications

for systems operating with lithium-ion/polymer batter-

ies. The backlight charge pump is capable of driving

up to six LEDs at a total of 180mA. The current sinks

may be operated in group or in parallel for driving

higher current LEDs. To maximize power efficiency,

the charge pump operates in 1X, 1.5X, or 2X mode,

where the mode of operation is automatically select-

ed by comparing the forward voltage of each LED

with the input voltage. AnalogicTech's AS²Cwire™

(Advanced Simple Serial Control™) serial digital input

is used to enable, disable, and set current for each

LED with a 16-level logarithmic scale plus four low-

current settings down to 50μA for optimized efficien-

cy, with a low housekeeping current of only 50μA.

•

V_INRange: 2.7V to 5.5V

Dual Charge Pump:

— Flash: Charge Pump Doubler

— Backlight: Tri-Mode Charge Pump

Backlight Charge Pump:

— Programmable Current With Single GPIO

— 16 Current Steps

— 15/20/30mA Max Current

— Four Low Current Settings

— Individual Main/Sub-Group Control

— Low I_Q(50μA) for Low-Current Mode

— Drives Six Channels of LEDs

Flash Charge Pump:

— Regulated V_{OUT_FL}4.5/5.0 Volts

— Up to 300mA of Current for Flash

1MHz Constant Switching Frequency

Independent Backlight/Flash Control

Built-In Thermal Protection

•

The flash charge pump is a charge pump doubler

with a regulated output voltage. It is designed to

deliver 120mA of continuous current and up to

300mA of pulsed current. It has an independent

enable pin for improved power savings.

Built-In Auto-Disable for Open Circuit

Automatic Soft Start

I_Q<1μA in Shutdown

Available in QFN44-24 Package

The AAT2803 is equipped with built-in protection,

short-circuit, and auto-disable for load short-circuit

condition. Built-in soft-start circuitry prevents exces-

sive inrush current during start-up. A low-current

shutdown feature disconnects the load from V_INand

reduces quiescent current to less than 1μA.

Applications

•

Color (RGB) Lighting

Programmable Current Sink

White LED Backlighting

The AAT2803 is available in a Pb-free, space-saving,

thermally enhanced 24-pin 4x4mm QFN package

and is rated over the -40°C to +85°C temperature

range.

White Photo Flash for Digital Still Cameras

Typical Application

1μF

C1⁺C1^-C2⁺C2^-C3⁺C3^-

Flash

VOUT

VIN

C_OUT

1μF

V_IN

C_IN

1μF

Backlight

AAT2803

C_OUT

1μF

EN_FL

ENFL

EN/SET

GND

2803.2006.12.1.6

12 3 4 5 6 7...16

中文翻译

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与AAT2803相关器件

型号	品牌	获取价格	描述	数据表
AAT2803ISK-4.5-T1	ANALOGICTECH	获取价格	Six-Channel White LED Backlight Charge Pump with Flash
AAT2803ISK-4.5-T1	AAT	获取价格	Six-Channel White LED Backlight Charge Pump with Flash
AAT2805	ANALOGICTECH	获取价格	Dual High Efficiency Charge Pump for White LED and Flash Applications
AAT2805	AAT	获取价格	Dual High Efficiency Charge Pump for White LED and Flash Applications
AAT2805IXN-4.5-T1	ANALOGICTECH	获取价格	Dual High Efficiency Charge Pump for White LED and Flash Applications
AAT2805IXN-4.5-T1	AAT	获取价格	Dual High Efficiency Charge Pump for White LED and Flash Applications
AAT2806	AAT	获取价格	Dual High Efficiency Charge Pump for White LED and Flash Applications
AAT2806	ANALOGICTECH	获取价格	Dual High Efficiency Charge Pump for White LED AND Flash Applications
AAT2806_07	ANALOGICTECH	获取价格	Dual High Efficiency Charge Pump for White LED and Flash Applications
AAT2806IXN-4.5-T1	AAT	获取价格	Dual High Efficiency Charge Pump for White LED and Flash Applications

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