PMBus™ voltage regulator reference design for Xilinx® Virtex Ultrascale+™ FPGAs
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Key Document


This reference design uses the TPS53681 multiphase controller and CSD95490Q5MC smart power stages to implement a high-performance design suitable for powering the 0.85-V, 200-A, VCCINT rail of a Xilinx™ Ultrascale+™ FPGA. The secondary output of the controller can then be used to power an auxilliary rail of the FPGA. The smart power stages and integrated PMBus™ allow for easy output voltage setting and telemetry of key design parameters.

The design enables configuration, VID 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.

  • 6+0 design—targeting main FPGA core rail
  • D-CAP+ modulator for superior current-sharing capabilities and transient response
  • PMBus compatibility for output voltage setting and telemetry for VIN, VOUT, IOUT, and temperature
  • Dual rail temperature monitoring for independent tracking of thermal performance
  • Full compensation tuning through PMBus
  • Peak efficiency of 92% for the VCCINT rail at the nominal 0.85 V output voltage

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Schematic/Block Diagram

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Test Data

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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)200
Output Power (W)180
Input TypeDC
TopologyBuck- Multiphase
Buck- Synchronous

TI Devices (6)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD17303Q5  30-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 2.6 mOhm  MOSFETs  Sample & Buy Not Available
CSD95490Q5MC  75A Synchronous Buck NexFET™ Smart Power Stage with DualCool Package  MOSFETs  Not Available Not Available
TLV3404  Quad nanopower high-voltage comparator with open-drain output  Amplifiers  Sample & Buy Not Available
TPS53681  Dual-Channel 6+2/5+3 D-CAP+TM Multiphase Step-Down Controller with PMBus and NVM  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
TPS62173  3–17V 0.5A Step-Down Converter in 2x2 QFN package  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
UCC27324  Non-inverting 4-A/4-A dual-channel low side gate driver  Gate drivers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD17303Q5 Download Download
CSD95490Q5MC VSON-CLIP (DMC)| 12 Download -
TLV3404 Download Download
Download Download
TPS53681 Download Download
TPS62173 Download Download
UCC27324 Download Download
Download Download
Download -
Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 8817 20 Feb 2019
Design files (5)
Title Type Size (KB) Date
ZIP 2586 18 Feb 2019
PDF 8435 18 Feb 2019
PDF 293 18 Feb 2019
PDF 231 18 Feb 2019
PDF 473 18 Feb 2019
Related Tools & Software

Hardware development (1)

Name Part Number Tool Type
Dual-channel(6+2 or 5+3 phases), D-CAP+ Step-Down, DC-DC Analog with PMBus Interface Evaluation Mod  TPS53681EVM-002  Evaluation board 

Software development (1)

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

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