The RT3668EB is a single channel PWM controller with 2 integrated drivers and 1 LDO regulator, it is compliant with AMD SVI2 Voltage Regulator Specification to support FP4 GFX power (VDDCR_GFX) and FCH power (VDDCR_FCH_S5). The RT3668EB 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) GFX 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 GFX domains. The RT3668EB can operate in diode emulation mode to enhance the light load efficiency. And it provides the current gain adjustment capability by pin setting. The RT3668EB also provides power good indication, thermal indication (VRHOT_L), and it features complete fault protection functions including over current, over voltage, under voltage.


  • AMD FP4 GFX and FCH Power
Key Spec.
Status Active
VID Table Support SVI2
Number of Phases 2
Vcc (typ) (V) 5
Vin (min) (V) 4.5
Vin (max) (V) 24
Accuracy (Vout>=1V) (+/- %) 0.5
Freq (typ) (kHz) 400
Built-in DAC Generator Yes
Number of MOSFET Drivers 2
Features Adjustable Frequency;Built-in Bootstrap Switch;DCR Current Sense;Diode Emulation Mode;Droop Control;Enable Input;Fast Transient Response;G-NAVP Control;OCP;OVP;Power Good;SCP;UVP
Package Type WQFN5x5-40
  • 2/1-Phase (VDDCR_GFX) PWM Controller
  • 2 Embedded MOSFET Driver
  • 1 LDO Regulator for FCH
  • 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 UpdateDownload
Single Channel PWM Controller with 2 Integrated Drivers and 1 LDO Regulator for AMD SVI2 GFX and FCH Power Supply2017/02/21
Technical Documents
TitleItem TypeLast UpdateDownload
Introduction to Richtek VCORE Solutions App. Note2017/05/31