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AAT2803

AAT
Part Number AAT2803
Manufacturer AAT
Description Six-Channel White LED Backlight Charge Pump
Published Apr 30, 2007
Detailed Description Six-Channel White LED Backlight Charge Pump with Flash General Description The AAT2803 is a dual charge pump designed to...
Datasheet PDF File AAT2803 PDF File

AAT2803
AAT2803

Overview
Six-Channel White LED Backlight Charge Pump with Flash General Description The AAT2803 is a dual charge pump designed to support both white LED backlight and flash applications for systems operating with lithium-ion/polymer batteries.
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 selected 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 lowcurrent settings down to 50μA for optimized efficiency, with a low housekeeping current of only 50μA.
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.
AAT2803 Features • • • ChargePump™ • • • • • • • • VIN Range: 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 IQ (50μA) for Low-Current Mode — Drives Six Channels of LEDs Flash Charge Pump: — Regulated VOUT_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 Built-In Auto-Disable for Open Circuit Automatic Soft Start IQ <1μA in Shutdown Available in QFN44-24 Package The AAT2803 is equipped with built-in protection, www.
DataSheet4U.
com short-circuit, and auto-disable for load short-circuit condition.
Built-in soft-start circuitry prevents ...


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