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The RT8843A/RT8843B/RT8843D is a 3/2/1 multi-phase synchronous buck controller optimized for high-performance graphic microprocessors and supports the nVidia OVR3i+ specification with a PWM-VID interface. It can support both DrMOS with current output and DCR current sensing. The RT8843A/RT8843B/RT8843D adopts AC G-NAVP<sup>TM</sup> (Green Native AVP), which is Richtek's proprietary topology derived from the finite DC gain of the internal GM amplifier with current mode control. By utilizing the AC G-NAVP<sup>TM</sup> topology, the operating frequency of the RT8843A/RT8843B/RT8843D varies with VID, load, and input voltage to further enhance efficiency, even in CCM (Continuous Conduction Mode). Moreover, the AC G-NAVP<sup>TM</sup> with CCRCOT (Constant Current Ripple COT) technology provides superior output voltage ripple over the entire input/output range.The RT8843A/RT8843B/RT8843D features an external reference input and PWM-VID dynamic output voltage control, where the output voltage is regulated and tracks the external input reference voltage. The RT8843A/RT8843B/RT8843D can set the internal RAMP amplitude through the PINSETx pin, optimizing stability and load transient performance. The RT8843A/RT8843B/RT8843D also provides complete fault protection functions, including Overvoltage Protection (OVP), Undervoltage Protection (UVP), Per-phase Current Limit, and Over-Temperature Protection (OTP). The recommended junction temperature range is from -40°C to 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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