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The RT9365 is a high performance white LED driver. It integrates current sources and automatic mode selection charge pump. The part maintains the high efficiency by utilizing an x1/x1.5 fractional charge pump and low dropout current sources. The small equivalent x1 mode open loop resistance and ultra-low dropout voltage of current source extend the operating time of x1 mode and optimize the efficiency of Li-ion battery in white LED applications. <p align="justify">The RT9365 supports up to 5 white LEDs and regulates a constant current for uniform intensity. The part implements a 4-bit DAC for brightness control. Users can easily configure the LED current from 1.25mA to 20mA by a serial pulse. The dimming of white LEDs current can be achieved by applying a pulse signal to the EN pin. There are totally 16 steps of current could be set by users. The operating voltage range is 2.8V to 5V. Internal soft start circuitry effectively reduces the in-rush current while both start-up and mode transition. The load is disconnected from V<sub>IN</sub> while shutdown and the shutdown current is less than 1&mu;A. </p><p align="justify">RT9365 is available in a WQFN 3x3-16L package.</p>
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  • 全电池电压范围内85%以上的平均效率
  • 驱动最多5只LED
  • 电流源最低压差为80mV (典型值)
  • 总负载能力为100mA
  • LED电流精度为1% (典型值)
  • LED间电流误差为0.7% (典型值)
  • 含软起动特性
  • 自动进行电荷泵模式选择
  • 250kHz固定工作频率
  • 输出有过压保护
  • 16级亮度控制
  • 输入噪声低，EMI问题少
  • 停机电流0.3μA
  • 符合RoHS规范，完全无铅
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手机，数码相机，MP3播放器 白色LED背光应用 液晶显示器
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