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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.
RT8843A/RT8843B/RT8843D Typical Circuit
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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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RT8843A/RT8843B/RT8843D Ordering Information
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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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