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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