器件名称: AAT2806IXN-4.5-T1
功能描述: Dual High Efficiency Charge Pump for White LED and Flash Applications
文件大小: 513.54KB 共16页
简 介:AAT2806
Dual High Efficiency Charge Pump for White LED and Flash Applications General Description
The AAT2806 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 80mA. 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 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 50A for optimized efficiency, with a typical operating quiescent current of less than 50A. 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 softstart circuitry. A low-current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1A. 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
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