5V 45A Dual Phase Synchronous Buck Reference Design


Design files


This is a synchronous buck reference design that uses TPS40322 in a dual phase topology. It is meant for 12V nominal input voltage and outputs 5V and is capable of providing up to 45A combined on both phases with excellent current sharing. The full load efficiency is 96.7% which provides great thermal performance as well as ripple and transient performance.

  • Over 96.7% efficient at full load
  • Excellent thermal, ripple and transient performance
  • Small solution size
  • Low cost design
Output voltage options PMP20516.1
Vin (Min) (V) 10.8
Vin (Max) (V) 13.2
Vout (Nom) (V) 5
Iout (Max) (A) 45
Output Power (W) 225
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Synchronous

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.

TIDUE33.PDF (1503 K)

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

TIDRV30.PDF (130 K)

Detailed schematic diagram for design layout and components

TIDRV31.PDF (65 K)

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

TIDRV32.PDF (48 K)

Detailed overview of design layout for component placement

TIDRV34.ZIP (222 K)

Files used for 3D models or 2D drawings of IC components


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

TIDRV33.PDF (48 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck controllers (external switch)

TPS40322Dual Output or Two-phase Synchronous Buck Controller

Data sheet document-pdfAcrobat PDF open-in-new HTML
Power blocks

CSD87353Q5D30-V, N channel synchronous buck NexFET™ power MOSFET, SON 5 mm x 6 mm power block, 40 A

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Test report PMP20516 Test Results Dec. 21, 2017

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