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


Design files


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
Output voltage options TIDA-01367.1
Vin (Min) (V) 10.8
Vin (Max) (V) 13.2
Vout (Nom) (V) .9
Iout (Max) (A) 150
Output Power (W) 135
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Multiphase^Buck- Synchronous
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.


Reference design overview and verified performance test data

TIDRS74.PDF (743 K)

Detailed schematic diagram for design layout and components

TIDRS75.PDF (221 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRS76.PDF (611 K)

Detailed overview of design layout for component placement

TIDCDQ1.ZIP (2590 K)

Design file that contains information on physical board layer of design PCB

TIDRS77.PDF (544 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck controllers (external switch)

TPS53679Dual-Channel 6+1/5+2 VR13 D-CAP+™ Step-Down Multiphase Controller With NVM and PMBus

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS7371-A, ultra-low-dropout voltage regulator with reverse current protection & enable

Data sheet: PDF | HTML
Low-side drivers

UCC27524A5-A/5-A dual-channel gate driver with 5-V UVLO, enable, and negative input voltage handling

Data sheet: PDF | HTML
N-channel MOSFETs

CSD17577Q5A30-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 5.8 mOhm

Data sheet: PDF | HTML
Power stages

CSD95490Q5MC75A Synchronous Buck NexFET™ Smart Power Stage with DualCool Package

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide High-Power Voltage Regulator Ref Design for Cavium ThunderX2® Arm® Processors (Rev. A) Aug. 23, 2018

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