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RT4540 是一款白光 LED 驱动器，适用于单节或双节电池输入，可驱动包含六组并联 LED 串列的灯条。内置电流吸收器可提供最高 ±2% 的电流失配精度，确保各 LED 串列具有优异的亮度一致性。为了提供足够的电流吸收器操作裕量，升压控制器会监测反馈引脚中的最低电压，并调节优化输出电压以提升电源效率。RT4540 内置 I²C 接口，可控制调光模式、工作频率及 LED 电流。其内置 250mΩ、36V 功率开关搭配电流模式控制，可提供过电流保护功能。RT4540 的开关频率可在 100kHz 至 1.6MHz 之间调整，在效率与元件尺寸之间提供设计灵活性。RT4540 采用 WQFN3x3-24（0.4mm Pitch）封装。建议结温范围为 -40°C 至 150°C，环境温度范围为 -40°C 至 125°C。
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