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Dual-Channel, Multi-Phase PWM Controller with I2C Interface for AMD SVI2 CPU Power Supply

RT8894A

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The RT8894A is a multi-phases PWM controller. Moreover, it is compliant with AMD SVI2 Voltage Regulator Specification to support both CPU core (VDD) and Northbridge portion (VDDNB) of the CPU. The RT8894A adopts the G-NAVPTM (Green-Native AVP), which is a Richtek's proprietary topology. The G-NAVP makes it an easy setting controller to meet all AMD AVP (Adaptive Voltage Positioning) 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 RT8894A uses SVI2 interface to control 8-bit DAC to set output voltage and operation mode, and support a dynamic platform master. An I2C interface is available for advanced power configuration and monitoring. The RT8894A also features programmable power states with different sets of operating phase number, over clocking offset, switching frequency, load-line and protection setting. The platform master can optimize the performance and efficiency of the power according to different working scenarios via the I2C interface. The RT8894A also provides power good indication, over-current indication and dual OCP mechanism for AMD SVI2 CPU core and NB. It also features complete fault protection functions including over-voltage, under-voltage and negative-voltage protections.

Applications

  • AMD SVI2 CPU
  • Desktop Computer
Key Spec.
RT8894A
Status Active
VID Table Support SVI2
Number of Phases 2;4
Vcc (typ) (V) 5
Vin (min) (V) 10.8
Vin (max) (V) 13.2
Accuracy (Vout>=1V) (+/- %) 0.5
Freq (typ) (kHz) 300
Built-in DAC Generator Yes
Number of MOSFET Drivers 3
Features Adjustable Frequency;Diode Emulation Mode;Droop Control;Enable Input;Fast Transient Response;G-NAVP Control;OCP;OVP;Power Good;UVP
Package Type WQFN7x7-56
Features
  • Dual Outputs :
    ► 4/3/2/1-Phase for VDD
    ► 2/1/0-Phase for VDDNB
  • Integrated 3 MOSFET Drivers for VDD VR
  • Power Stage Input for VDD VR Voltage Range up to 20V
  • 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
  • I2C Interface for Platform Configuration
  • Build-In ADC for VOUT and IOUT Reporting
  • Immediate OV, UV and NV Protections and UVLO
  • Programmable Dual OCP Mechanism
  • Accurate Current Balance
  • Fast Transient Response
  • Dynamic Phase Up/Down Control
  • Programmable Power State Control
  • Power Good Indicator for VDD VR
  • Thermal Monitor for VDD and VDDNB VRs
  • 56-Lead WQFN Package
  • RoHS Compliant and Halogen Free
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
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