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AAT2806 Datasheet(PDF) 1 Page - Advanced Analog Technology, Inc. |
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AAT2806 Datasheet(HTML) 1 Page - Advanced Analog Technology, Inc. |
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1 / 16 page  AAT2806 Dual High Efficiency Charge Pump for White LED and Flash Applications 2806.2006.04.1.8 1 ChargePump™ General Description The AAT2806 is a dual charge pump designed to support both the white LED backlight and flash appli- cations for systems operating with lithium-ion/poly- mer batteries. The backlight charge pump is capable of driving up to four LEDs at a total of 80mA. The cur- rent 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 automati- cally selected by comparing the forward voltage of each LED with the input voltage. AnalogicTech's S2Cwire™ (Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED with an eight-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. The AAT2806 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 AAT2806 is available in a Pb-free, space-saving, thermally-enhanced TDFN44-16 package and is rated over the -40°C to +85°C temperature range. Features •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 —S2Cwire Brightness Control — Tri-Mode Charge Pump — Maximum 20mA 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 Soft Start • No Inductors • Available in TDFN44-16 Package Applications • Color (RGB) Lighting • White LED Backlighting • White LED Photo Flash Typical Application AAT2806 CIN 1μF VIN COUT 1μF EN/SET C1 1μF D3 D2 D1 VIN C1+ C1- C2+ C2- C3+ C3- D2 GND Backlight C2 1μF C3 1μF Flash VOUT_FL VOUT_BL COUT 1μF EN_FLSH EN/SET EN_FLSH D1 D3 D4 VOUT_FLASH D4 |
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