The RT8889D is a three phase CPU power controller with triple integrated drivers for VR12.5 compliant. The RT8889D adopts 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 RT8889D also features a quick response mechanism for optimized AVP performance during load transient. The RT8889D supports mode transition function with various operating states. A Serial VID (SVID) interface is built in the RT8889D to communicate with Intel VR12.5 compliant CPU. The RT8889D 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 RT8889D varies with VID, load current and input voltage to further enhance the efficiency even in CCM. Besides 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 RT8889D integrates a high accuracy ADC for platform setting functions, such as no-load offset and over current protection level. 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 RT8889D is available in a WQFN-40L 5x5 small foot print package.


  • VR12.5 Intel Core Supply
  • Notebook/Desktop Computer/Servers Multi-phase CPU Core Supply
  • AVP Step-Down Converters
Key Spec.
Status Active
VID Table Support VR12.5
Number of Phases 3
Vcc (typ) (V) 5
Vin (min) (V) 4.5
Vin (max) (V) 13.5
Accuracy (Vout>=1V) (+/- %) 0.5
Freq (typ) (kHz) 300
Built-in DAC Generator Yes
Number of MOSFET Drivers 0
Features Adjustable Frequency;DCR Current Sense;Diode Emulation Mode;Droop Control;Enable Input;Fast Transient Response;G-NAVP Control;OCP;OVP;Power Good;UVP
Package Type WQFN5x5-40
  • Intel VR12.5 Serial VID Interface Compatible Power Management States
  • 3/2/1 Phase PWM Controller with Triple Integrated Driver
  • G-NAVPTM Topology
  • 0.5% DAC Accuracy
  • Differential Remote Voltage Sensing
  • Built-in ADC for Platform Programming
  • Accurate Current Balance
  • System Thermal Compensated AVP
  • Diode Emulation Mode at Light Load Condition for Single Phase
  • Fast transient Response
  • VR Ready Indicator
  • Thermal Throttling
  • Current Monitor Output
  • External No-Load Offset Setting
  • DVID Enhancement
  • Small 40-Lead WQFN Package
TitleLast UpdateDownload
3-Phase PWM Controller with Triple Integrated Drivers for VR12.5 CPU Core Power Supply2014/12/10
Technical Documents
TitleItem TypeLast UpdateDownload
Introduction to Richtek VCORE Solutions App. Note2017/05/31