Cavium CN99xx Thunder X2 CPU PMBus VDD/VDD SRAM core power design
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Key Document


The TIDA-01367 reference design uses the TPS53679 multiphase controller and CSD95490Q5MC Smart Power Stages to implement a high-performance design suitable for powering Cavium ThunderX2® ARM Processors.

The dual outputs of the controller target a 240-A, 0.8-V core rail with a six-phase design and a 20-A, 0.85-V auxiliary rail. The smart power stages and integrated PMBus™ allow for easy output voltage setting and telemetry of key design parameters. This reference design enables configuration, Vout adjustment, and compensation adjustment of the power supply, while providing monitoring of input and output voltage, current, power, and temperature.

TI's Fusion Digital Power™ Designer is used for programming, monitoring, validation, and characterization of the system.

  • Dual rail 6+1 design - high-powered core rail and single phase auxilliary rail
  • PMBus programming of Vout, and other IC parameters, as well as voltage margining
  • PMBus monitoring of input/output voltage, current, power, and temperature
  • Peak efficiencies of 90 and 91% for core and aux rails

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Schematic/Block Diagram

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Design Files

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(Output Voltage 1)
Vin (Min) (V)10.8
Vin (Max) (V)13.2
Vout (Nom) (V).9
Iout (Max) (A)150
Output Power (W)135
Input TypeDC
TopologyBuck- Multiphase
Buck- Synchronous

TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD17577Q5A  30-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 5.8 mOhm  MOSFETs  Sample & Buy Not Available
CSD95490Q5MC  75A Synchronous Buck NexFET™ Smart Power Stage with DualCool Package  MOSFETs  Not Available Not Available
TPS53679  Dual-Channel 6+1/5+2 VR13 D-CAP+™ Step-Down Multiphase Controller With NVM and PMBus  Step-down (buck) regulators  Sample & Buy Not Available
TPS737  1-A, ultra-low-dropout voltage regulator with reverse current protection & enable  Power management  Sample & Buy View Design Kits & Evaluation Modules
UCC27524A  5-A/5-A dual-channel gate driver with 5-V UVLO, enable, and negative input voltage handling  Gate drivers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD17577Q5A VSONP (DQJ)| 8 Download
CSD95490Q5MC VSON-CLIP (DMC)| 12 Download -
TPS53679 Download
TPS737 Download Download
Download Download
Download Download
UCC27524A Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 4008 23 Aug 2018
Design files (5)
Title Type Size (KB) Date
ZIP 2590 15 Aug 2017
PDF 544 15 Aug 2017
PDF 611 15 Aug 2017
PDF 221 15 Aug 2017
PDF 743 15 Aug 2017
Related Tools & Software

Software development (1)

Name Part Number Software Type
Digital Power Software  FUSION_DIGITAL_POWER_DESIGNER  Application software & framework 

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