High voltage buck converter reference design for BMS applications


Design files


This non-isolated buck converter provides a fixed output of 14 V at 130 mA for BMS applications. It operates over an input voltage range of 18 Vdc – 144 Vdc after a startup greater than 23 V. Operating in discontinuous conduction mode (DCM), this converter utilizes the UCC28730 controller, which is referenced to the switch node. It offers high efficiency and low cost in a compact form factor.

  • Unique floating controller ground reference allows operation at high input voltage (144 V)
  • Achieves an efficiency of between 79% - 86% (30-V to 120-V input, 130-mA output)
  • Low component count and small size
  • Utilizes a single standard inductor (no transformer required)
Output voltage options PMP22487.1
Vin (Min) (V) 23
Vin (Max) (V) 144
Vout (Nom) (V) 14
Iout (Max) (A) .13
Output Power (W) 1.82
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Non Sync
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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.

TIDT193.PDF (6053 K)

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

TIDM659.PDF (131 K)

Detailed schematic diagram for design layout and components

TIDM660.PDF (136 K)

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

TIDM661.PDF (105 K)

Detailed overview of design layout for component placement

TIDM663.ZIP (553 K)

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


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

TIDM662.PDF (377 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)

UCC28730-Q1Zero-power standby PSR flyback controller for automotive

Data sheet: PDF | HTML

Technical documentation

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* Test report High-Voltage Buck Converter Reference Design for BMS Applications PDF | HTML Aug. 11, 2020

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