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The RT8843 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 RT8843 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 RT8843 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 RT8843 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 RT8843 can set the internal RAMP amplitude through the PINSETx pin, optimizing stability and load transient performance. The RT8843 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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<div class="spec-list"><ul class="lv1"><li>Multi-Phase PWM Controller </li><li>PWM Tri-State Voltage, Pre-Short UVP - RT8843A: 1.95V, without Pre-Short UVP - RT8843B: 1.65V, without Pre-Short UVP - RT8843D: 1.65V, with Pre-Short UVP </li><li>PWM-VID Dynamic Output Voltage Control </li><li>Support 1.8V PWM-VID Interface </li><li>Power State Indicator - 1-Phase-DEM, Full-Phase DEM, Full-Phase CCM </li><li>External Reference Input Control </li><li>3/2/1-Phase Hardware Setting </li><li>Adjustable Soft-Start Time </li><li>Adjustable Per-Phase Current-Limit Threshold </li><li>Adjustable Switching Frequency </li><li>UVP, OVP, OTP Protection </li><li>Pre-Short UVP Protection for RT8843D </li><li>Power-Good Indicator </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>GPU Core Power for OVR3i+ Specification </li></ul></div>
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