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The RT8555 is a high efficiency driver for white LEDs. It is suitable for single/two cell battery input to drive LED light bars which contains six strings in parallel and up to 10 WLEDs per string. The internal current sinks support a maximum of &plusmn;2% current mismatching for excellent brightness uniformity in each string of LEDs. To provide enough headroom for current sink operation, the Boost controller monitors the minimum voltage of the feedback pins and regulates an optimized output voltage for power efficiency. <p align="justify">The RT8555 has a wide input voltage operating range from 2.7V to 24V and contains I<sup>2</sup>C interface for controlling the dimming mode, operating frequency and the LED current. The internal 100m&Omega;, 36V power switch with current-mode control provides over-current protection. The switching frequency of the RT8555 is adjustable from 300kHz to 2MHz, which allows flexibility between efficiency and component size. </p><p align="justify">The RT8555 is available in the WL-CSP-20B 1.65 x 2.05 (BSC), with pitch 0.4mm package.</p>
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  • 宽输入电压范围 : 2.7V ~ 24V
  • 高输出电压 : 高达36V
  • 可程序设计通道电流 : 10mA ~ 35mA
  • ±3%精准度与±2%匹配误差的通道电流调节
  • 调光控制
    ►直接PWM调光可达20kHz，最小导通时间400ns
    ►PWM转模拟调光可达20kHz和8位分辨率
  • I2C可编程LED电流，开关频率，调光模式
  • OTP内嵌式内存
  • 切换频率 : 300kHz ~ 2MHz
  • 保护
    ►LED串开路侦测
    ►电流限制
    ►可程序设计的过压保护
    ►过热保护
  • 20脚WL-CSP，0.4mm间距封装
  • 符合RoHS规范，不含卤素
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平板及笔记本电脑背光源
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