20A Communication/ Enterprise Storage ASIC Adaptive Voltage Scaling Power Supply PMBus Ref. Design


Design files


This is a 20A Communication or Enterprise Storage ASIC Adaptive Voltage Scaling (AVS) power supply using the TPS53819A PMBus PWM controller. The design enables high power density, PCB layout flexibility and ease of test and design for AVS using the PMBus interface and the Vout Adjustment and Margining Commands. The use of the external Power Block enables flexible PCB placement and upgrade to newer power blocks if needed.

  • Twenty nine (29) total components for a 20W power supply
  • 672mm² PCB power supply area
  • 34.1°C case temperature at 20A load (12VIN, 290KHz).
  • ~89% peak efficiency, >85% efficiency at 12VIN, 1Vout, 290KHz
  • Less than ±8mV peak-to-peak output voltage ripple at 20A load (12VIN)
  • Less than ±30mV peak-to-peak output voltage change in response to 12A load transient at 20A/us slew rate
Output voltage options PMP10778.1
Vin (Min) (V) 10.8
Vin (Max) (V) 13.2
Vout (Nom) (V) 1
Iout (Max) (A) 20
Output Power (W) 20
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology 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.

TIDU791.PDF (641 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDRD00.PDF (207 K)

Detailed schematic diagram for design layout and components

TIDRD01.PDF (105 K)

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

TIDRD02.PDF (83 K)

Detailed overview of design layout for component placement

TIDC917.ZIP (875 K)

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


Includes TI products in the design and potential alternatives.

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

TPS53819A3-V to 28-V, 40-A, synchronous D-CAP2 buck controller with PMBus

Data sheet: PDF | HTML

CSD87350Q5D30-V, N channel synchronous buck NexFET™ power MOSFET, SON 5 mm x 6 mm power block, 40 A

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report PMP10778 Test Results Feb. 18, 2015

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