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RT4531是用於背光應用的雙通道電流源、高效率非同步升壓轉換器。由於RT4531內置1.5A/36V功率MOSFET和兩個高電流匹配能力汲取電流,所以RT4531可驅動多達10s2p白光LED。RT4531允許極低的電壓淨空控制,從而有效地提高LED串的效率。RT4531支援PWM調光及單線數位調光介面,它可以實現10位元的亮度代碼編程。RT4531提供完整的保護功能,如輸入欠壓鎖定(UVLO),過電流保護(OCP),輸出過壓保護(OVP)和過溫保護(OTP)。RT4531採用WL-CSP-9B 1.35x1.35 (BSC)封裝。
輸入電壓範圍:2.5V~5.5V
內置軟啟動,UVLO, OTP, OCP, OVP
關機電流典型值:<1μA
1MHz開關頻率
可驅動最多2串共10顆WLED
獨立PWM調光及單線數位調光控制
高達10位元調光解析度
LED電流精準度±2% (IFBx = 20mA)
LED電流一致性±2% (IFBx = 20mA)
內置IFB1/IFB2引腳過壓保護、短路保護及使用檢測
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