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RT4539A 是高效率的 LED 驅動器,適用於 1-2 節鋰離子電池供電驅動 6 串 LED 並行連接的應用,其採用的內部電流吸入電路可達到最大 ±2% 電流一致性誤差,使各串 LED 之間的亮度保持最大程度的一致性。為了給電流吸入電路留出足夠的活動空間,Boost 轉換器對各個回饋引腳進行電壓監測並確保其最低值的穩定,因而可以獲得最佳的轉換效率。RT4539A 有寬達 2.7V-24V 的可用輸入電壓範圍,通過其自帶的 I2C 介面可對其調光模式、工作頻率和 LED 電流進行調節。它所使用的導通阻抗為 250mΩ、耐壓 36V 的功率開關和電流模式控制架構具有過流保護功能,工作頻率可在 300kHz-1.6MHz 間進行調節,容許在轉換效率和元件尺寸間進行折中處理。RT4539A 使用 WL-CSP-20B 1.71x2.371 (BSC) 和 WQFN-24L 4x4 封裝供貨。
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