AnalogicTech AAT2862背景光LED驱动和管理方案

AnalogicTech 公司的AAT2862是背景光LED驱动和多个LDO照明管理单元,集成了基于电荷泵的照明管理电路和4个LDO线性稳压器.电荷泵为所有的LED输出提供电源,并可配置多个LED,每个LED的输出可编程至30mA,两个LED输出,每个可编程至60mA.而每个LDO可提供高达200mA的负载电流. AAT2862输入电压从2.7V到5.5V,可用在有照相功能的移动设备,数码相机和多媒体手机.本文介绍了AAT2862的主要特性,功能方框图,典型应用电路以及评估板电路图, 评估板MCU电路图和元件列表.

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.
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