RT8843B Datasheet | Richtek

Description The RT8843A/RT8843B/RT8843D is a 3/2/1 multiphase synchronous buck controller optimized for highperformance graphic microprocessors and supports the n Vidia OVR3i+ specification with a PWM-VID interface. It can support both Dr MOS with current output and DCR current sensing. The RT8843A/RT8843B/RT8843D adopts AC G-NAVPTM (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-NAVPTM 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-NAVPTM 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 plete fault protection functions, including Overvoltage Protection (OVP), Undervoltage Protection (UVP), Per-phase Current Limit, and Over Temperature Protection (OTP). The remended junction temperature range is from - 40C to 125C. 2 Features - Multi-Phase PWM Controller - 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 - PWM-VID Dynamic Output Voltage Control - Support 1.8V PWM-VID Interface - Power State Indicator - 1-Phase-DEM, Full-Phase DEM, Full-Phase - External Reference Input Control - 3/2/1-Phase Hardware Setting - Adjustable Soft-Start Time - Adjustable Per-Phase Current-Limit Threshold - Adjustable Switching Frequency - UVP, OVP, OTP Protection -...