The RT8888D is a three phase CPU power controller with triple integrated driver for VR12.5 compliant. The RT8888D adopts the G-NAVPTM (Green Native AVP) which is Richtek's proprietary topology derived from finite DC gain of EA amplifier with current mode control, making it an easy setting the droop to meet all Intel CPU requirements of AVP (Adaptive Voltage Positioning). Based on the G-NAVPTM topology, the RT8888D also features a quick response mechanism for optimized AVP performance during load transient. The RT8888D supports mode transition function with various operating states. A Serial VID (SVID) interface is built in the RT8888D to communicate with Intel VR12.5 compliant CPU. The RT8888D supports VID on-the-fly function with three different slew rates : Fast, Slow and Decay. By utilizing the G-NAVPTM topology, the operating frequency of the RT8888D varies with VID, load current and input voltage to further enhance the efficiency even in CCM. Besides the G-NAVPTM, the CCRCOT (Constant Current Ripple Constant On Time) technology provides superior output voltage ripple over the entire input/output range. The built-in high accuracy DAC converts the SVID code ranging from 0.5V to 3.04V with 10mV per step. The RT8888D integrates a high accuracy ADC for platform setting functions, such as no-load offset and over current protection level. The RT8888D provides VR ready output signals. It also features complete fault protection functions including over-voltage (OV), under-voltage (UV), negative-voltage (NV), over-current (OC) and under-voltage lockout (UVLO). The RT8888D is available in the WQFN-40L 5x5 small foot print package.
Applications
- VR12.5 Intel Core Supply
- Notebook/Desktop Computer/Servers Multi-phase CPU Core Supply
- AVP Step-Down Converter