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


Design files


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
Output voltage options TIDA-050020.1
Vin (Min) (V) 10.8
Vin (Max) (V) 13.2
Vout (Nom) (V) .9
Iout (Max) (A) 200
Output Power (W) 180
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.

TIDUEJ0.PDF (8917 K)

Reference design overview and verified performance test data

TIDRZ21.PDF (473 K)

Detailed schematic diagram for design layout and components

TIDRZ22.PDF (231 K)

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

TIDRZ23.PDF (293 K)

Detailed overview of design layout for component placement

TIDCFB0.ZIP (2586 K)

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

TIDRZ24.PDF (8435 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC controllers (external FET)

TPS53681Dual-Channel 6+2/5+3 D-CAP+TM Multiphase Step-Down Controller with PMBus and NVM

Data sheet: PDF | HTML
AC/DC & DC/DC converters (integrated FET)

TPS621733–17V 0.5A Step-Down Converter in 2x2 QFN package

Data sheet: PDF | HTML

TLV3404Quad nanopower high-voltage comparator with open-drain output

Data sheet: PDF | HTML
Low-side drivers

UCC27324Non-inverting 4-A/4-A dual-channel low side gate driver

Data sheet: PDF | HTML

CSD17303Q530-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 2.6 mOhm

Data sheet: PDF
Si 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 PMBus voltage regulator reference design for Xilinx Ultrascale+ FPGAs Feb. 20, 2019

Related design resources

Hardware development

TPS53681EVM-002 Dual-channel (6+2/5+3) evaluation module for D-CAP+™ step-down controller with PMBus interface

Software development


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