Dual-Output PWM Controller with 2 Integrated Drivers for AMD SVI2 Mobile CPU Power Supply


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The RT3661AB is a dual-output PWM controller with 2 integrated drivers, and it is compliant with AMD SVI2 Voltage Regulator Specification to support both CPU core (VDD) and Northbridge portion of CPU (VDDNB). The RT3661AB features CCRCOT (Constant Current

Ripple Constant On-Time) with G-NAVP (Green-Native AVP), which is Richtek's proprietary topology. G-NAVP makes it an easy setting controller to meet all AMD AVP (Adaptive Voltage Positioning) VDD/VDDNB requirements. The droop is easily programmed by setting the DC gain of the error amplifier. With proper compensation, the load transient response can achieve optimized AVP performance. The controller also uses the interface to issue VOTF Complete and to send digitally encoded voltage and current values for the VDD/VDDNB domains. The RT3661AB can operate in diode emulation mode to enhance the light load efficiency. And it provides the current gain adjustment capability by pin setting. The RT3661AB provides power good indication, thermal indication (VRHOT_L), and it features complete fault protection functions including over current, over voltage, under voltage.


  • AMD SVI2 Mobile CPU
  • Laptop Computer
Key Spec.
Status Active
VID Table Support SVI2
Number of Phases 1;1
Vcc (typ) (V) 5
Vin (min) (V) 4.5
Vin (max) (V) 26
Accuracy (Vout>=1V) (+/- %) 0.5
Freq (typ) (kHz) 400
Built-in DAC Generator Yes
Number of MOSFET Drivers 2
Features Diode Emulation Mode;Fast Transient Response;G-NAVP Control;OCP;OVP;Power Good;UVP
Package Type WQFN5x5-40
  • 1-Phase (VDD) + 1/0-Phase (VDDNB) PWM Controller
  • 2 Embedded MOSFET Drivers
  • G-NAVPTM Topology
  • Support Dynamic Load-Line and Zero Load-Line
  • Diode Emulation Mode at Light Load Condition
  • SVI2 Interface to Comply with AMD Power Management Protocol
  • Adjustable Current Gain Capability
  • DVID Enhancement
  • 0.5% DAC Accuracy
  • Differential Remote Voltage Sensing
  • Build-in ADC for Pin Setting Programming, Thermal Indication and VOUT, IOUT Reporting
  • Fast Transient Response
  • Power Good Indicator
  • Thermal Indicator (VRHOT_L)
  • OVP, UVP and UVLO
  • Over Current Protection
TitleLast UpdateShareDownload
Dual-Output PWM Controller with 2 Integrated Drivers for AMD SVI2 Mobile CPU Power Supply2017/02/21
Technical Documents
TitleLast UpdateShareDownload
Richtek Vcore Product Selection List for Intel and AMD platforms [May, 2017]2018/11/15
Introduction to Richtek VCORE Solutions2017/10/18