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The RT4539A 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. 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 converter monitors the minimum voltage of the feedback pins and regulates an optimized output voltage for power efficiency.<br /><br />The RT4539A 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 250m&Omega;, 39V power switch with current-mode control provides over-current protection. The switching frequency of the RT4539A is adjustable from 300kHz to 1.6MHz, which allows flexibility between efficiency and component size.<br /><br />The RT4539A are available in the WL-CSP-20B 1.71x2.371 (BSC) and WQFN-24L 4x4 packages.
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  • 输入电压范围：2.7V-24V
  • 输出电压：最高可达 39V
  • 各通道可调电流范围：10.04mA-35mA
  • 各通道电流调节精度：±3%
  • 各通道间电流一致性误差：±2%
  • 调光
    ►多种模式可选
    ►PWM 直接调光信号频率可达 20kHz，最短脉冲持续时长 400ns
    ►PWM 转模拟调光信号频率可达 20kHz，9 位分辨率
    ►可通过 PWM 引脚和/或 I2C 接口进行，可程控选择 12 位线性或 11 位指数亮度控制
    ►调光过程平滑无痕
  • Boost 转换器
    ►工作频率可调范围：300kHz-1.6MHz
    ►轻载时以 PFM 模式提升效率
    ►可程控选择频谱扩展模式和边沿变换斜率以降低噪声、改善 EMI 性能
  • 保护
    ►LED 串开路保护
    ►LED 串短路保护
    ►Boost 转换器电流限制阈值程控可调
    ►过压保护阈值程控可调
    ►过热保护
  • 集成 MTP 存储器
  • 0.4mm 间距、20 球 WL-CSP 封装和 24 引脚 QWFN 封装
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平板电脑和笔记本电脑显示屏背光
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