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RT8843A/RT8843B/RT8843D 是一款 3/2/1 多相同步降压控制器，针对高性能图形微处理器进行优化，并通过 PWM-VID 接口支持 nVidia OVR3i+ 规范。它可同时支持具电流输出的 DrMOS 与 DCR 电流检测。RT8843A/RT8843B/RT8843D 采用 AC G-NAVP<sup>TM</sup> (Green Native AVP)，这是立锜专有的拓扑，由内部 GM 放大器的有限 DC 增益搭配电流模式控制所衍生。通过采用 AC G-NAVP<sup>TM</sup> 拓扑，RT8843A/RT8843B/RT8843D 的工作频率会随 VID、负载与输入电压而变化，即使在 CCM (Continuous Conduction Mode) 下亦可进一步提升效率。此外，具 CCRCOT (Constant Current Ripple COT) 技术的 AC G-NAVP<sup>TM</sup> 可在整个输入 / 输出范围内提供优异的输出电压纹波表现。RT8843A/RT8843B/RT8843D 具备外部参考输入与 PWM-VID 动态输出电压控制，其中输出电压会被调节并跟踪外部输入参考电压。RT8843A/RT8843B/RT8843D 可通过 PINSETx 引脚设置内部 RAMP 振幅，以优化稳定性与负载瞬态性能。RT8843A/RT8843B/RT8843D 亦提供完整的故障保护功能，包括过压保护 (OVP)、欠压保护 (UVP)、逐相电流限制与过温保护 (OTP)。建议结温范围为 −40°C 至 125°C。
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<li class="mv5"> Multi-Phase PWM Controller<br /> </li><li class="mv5"> PWM Tri-State Voltage, Pre-Short UVP<br /> - RT8843A: 1.95V, without Pre-Short UVP<br /> - RT8843B: 1.65V, without Pre-Short UVP<br /> - RT8843D: 1.65V, with Pre-Short UVP<br /> </li><li class="mv5"> PWM-VID Dynamic Output Voltage Control<br /> </li><li class="mv5"> Support 1.8V PWM-VID Interface<br /> </li><li class="mv5"> Power State Indicator<br /> - 1-Phase-DEM, Full-Phase DEM, Full-Phase CCM<br /> </li><li class="mv5"> External Reference Input Control<br /> </li><li class="mv5"> 3/2/1-Phase Hardware Setting<br /> </li><li class="mv5"> Adjustable Soft-Start Time<br /> </li><li class="mv5"> Adjustable Per-Phase Current-Limit Threshold<br /> </li><li class="mv5"> Adjustable Switching Frequency<br /> </li><li class="mv5"> UVP, OVP, OTP Protection<br /> </li><li class="mv5"> Pre-Short UVP Protection for RT8843D<br /> </li><li class="mv5"> Power-Good Indicator</li>
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<li class="mv5"> GPU Core Power for OVR3i+ Specification</li>
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