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RT6543A/B 是用于将电池高电压转换为低电压为 CPU 内核、I/O 接口和存储器等供电的高效同步 Buck 控制器,具有转换效率高、瞬态响应特性好、输出精度高等特性。通过控制 VID1、VID0 端的状态,RT6543A/B 的输出电压可在 0V~1.8V 间进行调节。与传统的电流模式控制架构不同,RT6543A/B 无需使用电阻进行电流检测以提高转换效率。它具有驱动同步整流 MOSFET 开关的能力,在轻载条件下又可进入二极管仿真模式以降低损耗。它还具有欠压锁定、过压保护、欠压保护、过热保护和电流限制保护功能。其封装形式为 WQFN-20L 3x3。
高效降压 DC/DC 控制器
内建参考电压精度:1%
输出电压 2 位可编程
工作频率可调
输入电压范围:3V~24V
内建软启动减少电流冲击
可驱动大型同步整流 MOSFET
Power Good 指示
逐周期电流限制
过热关机RT6543A:VID改变时,输出电压按设定速度变化至新值
RT6543B:VID改变时,输出电压自然变化至新值
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