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Multi-Phase PWM Controller for CPU Core Power Supply

RT8884B

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The RT8884B is a 4/3/2/1 multi-phase synchronous Buck controller designed to meet Intel VR12.5 compatible CPU specification with a serial VID control interface. The RT8884B 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 RT8884B also features a quick response mechanism for optimized AVP performance during load transient. The RT8884B supports mode transition function with various operating states. A Serial VID (SVID) interface is built in the RT8884B to communicate with Intel VR12.5 compliant CPU. The RT8884B 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 RT8884B varies with VID, load current and input voltage to further enhance the efficiency even in CCM. Besides G-NAVPTM, the CCRCOT (Constant Current Ripple Constant On Time) technology provides superior output voltage ripple over the entire input/output range.

Applications

  • VR12.5 Intel Core Power Supply
  • Notebook/Desktop Computer/Servers Multi-phase CPU Core Power Supply
  • AVP Step-Down Converter
Key Spec.
RT8884B
Status Active
Vin (min) (V) 10.8
Vin (max) (V) 13.2
Vout (min) (V) 0.5
Vout (max) (V) 3.04
Number of Phases 4
Accuracy (Vout>=1V) (+/- %) 0.5
Freq Adj Yes
Freq (typ) (kHz) 300
Vcc (typ) (V) 5
Features OCP;OVP;Power Good;UVP
Package Type WQFN4x4-32
Features
  • Intel VR12.5 Serial VID Interface Compatible
  • 4/3/2/1 Phase PWM Controller
  • G-NAVPTM Topology
  • 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 Operation
  • Fast Transient Response
  • VR Ready Indicator
  • Thermal Throttling
  • Current Monitor Output
  • OVP, UVP, OCP, NVP, UVLO
  • External No-Load Offset Setting
  • DVID Enhancement
  • Small 32-Lead WQFN Package
  • RoHS Compliant and Halogen Free
Datasheet
TitleLast UpdateShareDownload
Multi-Phase PWM Controller for CPU Core Power Supply2013/03/15
Technical Documents
TitleLast UpdateShareDownload
DCR Temperature Compensation2021/03/18
Comparison of DCR Current Sense Topologies2016/07/07
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