High-Efficiency Small Form Factor 112W Sync Buck Reference Design


Design files


PMP10691 is a single-phase synchronous switching regulator rated for 3.3V, 35A output from an input voltage of 12V. This design uses the LM27403 synchronous buck controller and two CSD87350Q5D power block MOSFETs to provide maximum efficiency when combined with a 250nH ferrite output inductor. This design solution uses all ceramic capacitors to fit into a minimum board area.

  • High Power Density
  • Self contained - does not need external capacitors
  • 9.4mm max component height
  • Small solution size
Output voltage options PMP10691.1
Vin (Min) (V) 12
Vin (Max) (V) 12
Vout (Nom) (V) 3.3
Iout (Max) (A) 35
Output Power (W) 115.5
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.

TIDUA30.PDF (1253 K)

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

TIDRF50.PDF (428 K)

Detailed schematic diagram for design layout and components

TIDRF51.PDF (128 K)

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

TIDRF53.ZIP (566 K)

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


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

TIDRF52.PDF (435 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck controllers (external switch)

LM274033-V to 20-V voltage-mode synchronous buck controller and temperature-compensated DCR current sensing

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

CSD87350Q5D30-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 PMP10691 Test Results Jun. 10, 2015

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