Semtech SC668八路LED驱动管理解决方案

Semtech 公司的SC668是八路LED照明管理单元，具有自动息灯保护，环境光传感器输入，PWM调光等功能和四个200A低噪音LDO稳压器。可驱动8个LED灯，每个灯的电流从0mA 到25mA，电流精度± 1.5%，电流匹配度± 0.5%，具有I2C快模式和标准模式，主要用在手机，智能手机和PDA，LCD模块，手提媒体显示器和数玛相机，PND和键盘背光与LED指示器。本文介绍了SC668主要特性，方框图，典型应用电路以及PCB推荐布局图。

SC668：8 LED Light Management Unit Automatic Dropout Prevention , Ambient Light Sense Input, PWM Dimming, and 4 LDOs

The SC668 is a highly integrated light management unit that provides programmable current for up to eight LED current sinks. Four LED banks are provided to allow set­tings for various LED zones or indicators. Four low-noise LDOs with programmable outputs ranging from 1.2V to 3.3V and 200mA maximum output current are also included.

ADP limits the maximum LED current to a level that ensures the LEDs maintain matched currents when the supply voltage approaches dropout. This feature produces accept­able light output at low supply voltage levels without requiring a boost converter or charge pump.
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