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AnalogicTech AAT2862背景光LED驅動和管理方案

2009-12-14 作者：admin 來源：AnalogicTech 瀏覽量：網友評論： 0 條

摘要： AnalogicTech 公司的AAT2862是背景光LED驅動和多個LDO照明管理單元,集成了基于電荷泵的照明管理電路和4個LDO線性穩壓器.

　　AnalogicTech 公司的AAT2862是背景光LED驅動和多個LDO照明管理單元,集成了基于電荷泵的照明管理電路和4個LDO線性穩壓器.電荷泵為所有的LED輸出提供電源,并可配置多個LED,每個LED的輸出可編程至30mA,兩個LED輸出,每個可編程至60mA.而每個LDO可提供高達200mA的負載電流. AAT2862輸入電壓從2.7V到5.5V,可用在有照相功能的移動設備,數碼相機和多媒體手機.本文介紹了AAT2862的主要特性,功能方框圖,典型應用電路以及評估板電路圖, 評估板MCU電路圖和元件列表.

　　AAT2862: Backlight LED Driver and Multiple LDO Lighting Management Unit The AAT2862 is a highly integrated charge pump-based lighting management unit with four linear regulators optimized for single-cELl lithium-ion/polymer systems.

　　The charge pump provides power for all LED outputs and multiple LED configurations are available. The LED outputs can be programmed up to 30mA each and two LED outputs can be programmed up to 60mA each. An I2C serial digital interface is used to enable, disable, and set the current to one of 32 levels. Current matching is better than 3% for uniform display brightness, and high current matching is better than 5% for uniform power dissipation.

　　The AAT2862 also offers four high-performance lownoise MicroPower low dropout (LDO) linear regulators. The regulators are enabled and their output voltages are set through the I2C serial interface. Each LDO can supply up to 200mA load current and ground-pin current is only 80μA making the AAT2862 ideal for battery-operated applications.

　　The AAT2862 is available in a Pb-free, space saving TQFN34-24 package and operates over the -40℃ to +85℃ ambient temperature range.

　　AAT2862主要特性:

　　Input Voltage Range: 2.7V to 5.5V

　　Tri-Mode Charge Pump

　　Drives up to Eight LEDs

　　32 Programmable Backlight Current with Auto-fade

　　Settings Ranging From 500μA to 30mA

　　Drives up to Two Auxiliary LEDs

　　1MHz Switching Frequency

　　Automatic Soft Start

　　I2C Selectable Drivers

　　Four Linear Regulators