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AAT2805

AAT
Part Number AAT2805
Manufacturer AAT
Description Dual High Efficiency Charge Pump
Published Apr 30, 2007
Detailed Description AAT2805 Dual High Efficiency Charge Pump for White LED and Flash Applications General Description The AAT2805 is a dual ...
Datasheet PDF File AAT2805 PDF File

AAT2805
AAT2805


Overview
AAT2805 Dual High Efficiency Charge Pump for White LED and Flash Applications General Description The AAT2805 is a dual charge pump designed to support both the white LED backlight and flash applications for systems operating with lithium-ion/polymer batteries.
The backlight charge pump is capable of driving up to four LEDs at a total of 120mA.
The current sinks may be operated individually 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 low-current settings down to 50µA for optimized efficiency, with a typical operating quiescent current of less than 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 250mA of pulsed current.
It has an independent enable pin for improved power savings.
www.
DataSheet4U.
com The AAT2805 has thermal protection and built-in soft-start circuitry.
A low-current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1µA.
The AAT2805 is available in a space-saving, thermally-enhanced TDFN44-16 package and is rated over the -40°C to +85°C temperature range.
Features • • • ChargePump™ • • • • • • VIN Range: 2.
7V to 5.
5V Dual Charge Pump to Support Backlight and Flash LEDs Backlight Charge Pump: — Regulated Current — Four Current Sink Inputs — AS2Cwire Brightness Control — Tri-Mode Charge Pump — Maximum 30mA of Current Per Input — Low IQ (50µA) in Light Load Mode Flash Charge Pump: — Regulated Output Voltage — Up to 250mA of Pulsed Current Independent Backlight/Flash Control Low Noise 1MHz Constant Frequency Operation Automatic Sof...


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