Multi-Phase PWM Controller with PWM-VID Reference

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^TM (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^TM 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^TM 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.