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Dual Channel PWM Controller with 3/2/1 Phase for CORE VR and Single Phase for AXG VR

RT8876A

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The RT8876A is a VR12/IMVP7 compliant CPU power controller which includes two channels : a 3/2/1 phase with 3 integrated drivers synchronous Buck controller for the CORE VR, and a single phase Buck controller for the AXG VR. The RT8876A adopts G-NAVPTM (Green Native Adaptive Voltage Positioning), which is Richtek's proprietary topology derived from a finite DC gain compensator with current mode control, making it an easy setting PWM controller, meeting all Intel CPU requirements of AVP. Based on the G-NAVPTM topology, the RT8876A also features a quick response mechanism for optimizing AVP performance during load transient. The RT8876A supports mode transition function with various operating states. A serial VID (SVID) interface is built in the RT8876A to communicate with Intel VR12/IMVP7 compliant CPU. The RT8876A 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 RT8876A varies with VID, load and input voltage to further enhance the efficiency even in CCM. The built-in high accuracy DAC converts the SVID code ranging from 0.25V to 1.52V with 5mV per step. The RT8876A integrates a high accuracy ADC for platform setting functions, such as no-load offset or over current level.

Applications

  • VR12/IMVP7 Intel Core Supply
  • Notebook/ Desktop Computer/ Servers Multi-phase CPU Core Supply
  • AVP Step-Down Converter
  • Motherboards
Key Spec.
RT8876A
Status Active
VID Table Support VR12
Number of Phases 1;3
Vcc (typ) (V) 5
Vin (min) (V) 4.5
Vin (max) (V) 13.2
Accuracy (Vout>=1V) (+/- %) 0.5
Freq (typ) (kHz) 300
Built-in DAC Generator Yes
Number of MOSFET Drivers 0;3
Features Adjustable Frequency;DCR Current Sense;Droop Control;Enable Input;OCP;OVP;Power Good;SCP;Voltage Mode Control
Package Type WQFN7x7-56
Features
  • VR12/IMVP7 Compatible Power Management
  • 3/2/1 Phase for CORE VR and Single Phase for AXG VR
  • 3 Embedded MOSFET Drivers at the CORE VR
  • G-NAVPTM Topology
  • Serial VID Interface
  • 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
  • 1.1VINITIAL / 0.0VINITIAL for both Rails at Startup
  • Power Ready Indicator
  • Thermal Throttling
  • Current Monitor Output
  • OVP, UVP, OCP, OTP, UVLO
  • External No-load Offset Setting for both Rails
  • DVID Enhancement
  • 56-Lead WQFN Package
  • RoHS Compliant and Halogen Free
Datasheet
TitleLast UpdateShareDownload
Dual Channel PWM Controller with 3/2/1 Phase for CORE VR and Single Phase for AXG VR2012/01/02
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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