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RT4539 是高效率的 LED 驱动器，适用于 1-2 节锂离子电池供电驱动 6 串 LED 并行连接的应用，其采用的内部电流吸入电路可达到最大 ±2% 电流一致性误差，使各串 LED 之间的亮度保持最大程度的一致性。为了给电流吸入电路留出足够的活动空间，Boost 转换器对各个反馈引脚进行电压监测并确保其最低值的稳定，因而可以获得最佳的转换效率。</br>RT4539 有宽达 2.7V-24V 的可用输入电压范围，通过其自带的 I<sup>2</sup>C 接口可对其调光模式、工作频率和 LED 电流进行调节。它所使用的导通阻抗为 250mΩ、耐压 36V 的功率开关和电流模式控制架构具有过流保护功能，工作频率可在 300kHz-1.6MHz 间进行调节，容许在转换效率和元件尺寸间进行折中处理。</br>RT4539 使用 WL-CSP-20B 1.71x2.371 (BSC) 和 WQFN-24L 4x4 封装供货。
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<div class="spec-list"><ul class="lv1"><li>输入电压范围：2.7V-24V </li><li>输出电压：最高可达 39V </li><li>各通道可调电流范围：10.04mA-35mA </li><li>各通道电流调节精度：±3% </li><li>各通道间电流一致性误差：±2% </li><li>调光 <ul class="lv2"> <li></li><li>多种模式可选 </li><li>PWM 直接调光信号频率可达 20kHz，最短脉冲持续时长 400ns </li><li>PWM 转模拟调光信号频率可达 20kHz，9 位分辨率 </li><li>可通过 PWM 引脚和/或 I<sup>2</sup>C 接口进行，可程控选择 12 位线性或 11 位指数亮度控制 </li><li>调光过程平滑无痕 </li></ul> </li><li>Boost 转换器 <ul class="lv2"> <li></li><li>工作频率可调范围：300kHz-1.6MHz </li><li>轻载时以 PFM 模式提升效率 </li><li>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 </li></ul> </li><li>保护 <ul class="lv2"> <li></li><li>LED 串开路保护 </li><li>LED 串短路保护 </li><li>Boost 转换器电流限制阈值程控可调 </li><li>过压保护阈值程控可调 </li><li>过热保护 </li></ul> </li><li>集成 MTP 存储器 </li><li>0.4mm 间距、20 球 WL-CSP 封装和 24 引脚 QWFN 封装 </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>平板电脑和笔记本电脑显示屏背光 </li></ul></div>
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