Multi-Phase PWM Controller for CPU Core Power Supply


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The RT3613EJ is a 3/2/1 multi-phase synchronous buck controller designed to meet Intel IMVP9 compatible CPU specification with a serial VID control interface. The RT3613EJ 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 easy to set the droop to meet all Intel CPU requirements of AVP (Adaptive Voltage Positioning). Based on the G- NAVPTM topology, the RT3613EJ features a new generation of quick response mechanism (Adaptive Quick Response, AQR) to optimize AVP performance during load transient and reduce output capacitors. The RT3613EJ supports mode transition function with various operating states. A serial VID (SVID) interface is built in the RT3613EJ to communicate with Intel IMVP9 compliant CPU. The RT3613EJ 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 RT3613EJ varies with VID, load and input voltage to further enhance the efficiency even in CCM. Moreover, the G-NAVPTM with CCRCOT (Constant Current Ripple COT) technology provides superior output voltage ripple over the entire input/output range. The built-in high accuracy DAC converts the SVID code ranging from 0V to 2.74V with 10mV per step. The RT3613EJ integrates a high accuracy ADC for platform and function settings, such as ICCMAX, switching frequency, over-current threshold and AQR trigger level. The RT3613EJ provides VR Ready and thermal indicators. It also features complete fault protection functions including over-voltage (OV), under-voltage (UV), over-current (OC) and under-voltage lockout (UVLO).


  • IMVP9 Intel Core Supply
  • Notebook Computer Multi-Phase CPU Core Supply
  • AVP Step-Down Converter
Key Spec.
Status Active
VID Table Support IMVP9
Number of Phases 3
Vcc (typ) (V) 5
Vin (min) (V) 4.5
Vin (max) (V) 24
Accuracy (Vout>=1V) (+/- %) 0.5
Freq (typ) (kHz) 600
Built-in DAC Generator Yes
Number of MOSFET Drivers 0
Features Adjustable Frequency;Cycle-by-Cycle Current Limit;DCR Current Sense;Diode Emulation Mode;Droop Control;Enable Input;Fast Transient Response;G-NAVP Control;OCP;OVP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type WQFN4x4-32
  • Intel IMVP9 Serial VID Interface Compatible Power Management States
  • 3/2/1 Phase PWM Controller
  • G-NAVPTM (Green Native Adaptive Voltage Positioning) Topology
  • 0.5% DAC Accuracy
  • Differential Remote Voltage Sensing
  • Built-in ADC for Platform Programming and Reporting
  • Accurate Current Balance
  • System Thermal Compensated AVP
  • Diode Emulation Mode at Light Load Condition
  • Fast Transient Response-Adaptive Quick Response (AQR)
  • VR Ready Indicator
  • Thermal Monitoring and Indicator
  • Current Monitoring
  • IMVP9 System Input Power Monitoring
  • Multi-Vendor Dr.MOS
  • Switching Frequency Range Setting
  • Slew Rate Setting
  • DVID Enhancement
  • Acoustic Noise Suppression
  • Small 32-Lead WQFN Package