300W 12Vout 4-Switch Buck-Boost for Industrial PC Reference Design
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Key Document


The PMP21278 reference design is a 300W power supply utilizing the LM5176 4-switch buck-boost controller for industrial applications. This design can operate from 9V to 50V. The design has a 12V output and capable of sourcing 25A continuous current. Switching frequency is set to 230kHz. PMP21278 is assembled on SV601348A PCB. Three 6.8mF, 65V rated electrolytic capacitors are used to damp the input supply’s wiring inductance for all test data taken on this test report.

  • 9V to 50Vin, output 12V @ 25A
  • Achieving peak efficiency of 97%
  • over current, over voltage and over temperature protection
  • High power density

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Schematic/Block Diagram

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Design Guide

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Design Files

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(Output Voltage 1)
Vin (Min) (V)9
Vin (Max) (V)50
Vout (Nom) (V)12
Iout (Max) (A)25
Output Power (W)300
Input TypeDC
TopologyBuck Boost- 4 Switch

TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD17573Q5B  30V, N ch NexFET MOSFETâ„¢, single SON5x6, 1.45mOhm  MOSFETs  Sample & Buy Not Available
CSD19502Q5B  80V, N ch NexFET MOSFETâ„¢, single SON5x6, 4.1mOhm  MOSFETs  Sample & Buy Not Available
LM5176  55V wide VIN synchronous 4-switch buck-boost controller  Buck-boost & inverting regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD17573Q5B VSON-CLIP (DNK)| 8 Download
LM5176 Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 1298 04 Jan 2018
Design files (5)
Title Type Size (KB) Date
ZIP 387 04 Jan 2018
ZIP 700 04 Jan 2018
PDF 1436 04 Jan 2018
PDF 103 04 Jan 2018
PDF 214 04 Jan 2018

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