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RT4531是用于背光应用的双通道电流源、高效率异步升压转换器。由于RT4531内置1.5A/36V功率MOSFET和两个高电流匹配能力汲取电流,所以RT4531可驱动多达10s2p白光LED。RT4531允许极低的电压净空控制,从而有效地提高LED串的效率。RT4531支持PWM调光及单线数字调光接口,它可以实现10位的亮度代码编程。RT4531提供完整的保护功能,如输入欠压锁定(UVLO),过电流保护(OCP),输出过压保护(OVP)和过温保护(OTP)。RT4531采用WL-CSP-9B 1.35x1.35 (BSC)封装。
输入电压范围:2.5V~5.5V
内置软启动,UVLO, OTP, OCP, OVP
关机电流典型值:<1μA
1MHz开关频率
可驱动最多2串共10颗WLED
独立PWM调光及单线数字调光控制
高达10位调光分辨率
LED电流精准度±2% (IFBx = 20mA)
LED电流一致性±2% (IFBx = 20mA)
内置IFB1/IFB2引脚过压保护、短路保护及使用检测
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