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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。RT4539 有宽达 2.7V-24V 的可用输入电压范围,通过其自带的 I2C 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。RT4539 使用引脚间距为 0.4mm 的 WL-CSP-20B 1.71x2.371 (BSC) 封装供货。
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