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PMP23377

Four-switch buck-boost DC/DC converter reference design

PMP23377

Design files

Overview

This reference design is a four-switch, buck-boost DC/DC converter used for battery backup unit (BBU) applications, targeting Open Compute Project® (OCP) Open Rack V3 Power BBU specifications. This design has a 1.4kW power capability. The converter works in either buck, buck-boost, or boost mode depending on the VIN and VOUT voltage. The converter transients smoothly between each mode. Peak current mode control is employed in this design, providing a fast load transient response. Relying on the LM51770 features, no extra driver is needed for field-effect transistors.

Features
  • 1.4kW power capability per phase then N-number of phases can be connected in parallel for higher power battery discharge operation
  • Bidirectional conversion under varying VIN–VOUT
  • Multimode operation: seamless transition between buck to buck-boost and buck-boost to boost
  • Integrated average input and output current monitor or limiter either in input or output
  • Peak efficiency >98.5%; high load efficiency for VIN ≅ VOUT over the full range of the output current
  • Meets OCP-V3, 50V BBU power conversion function
Output voltage options PMP23377.1
Vin (Min) (V) 28.6
Vin (Max) (V) 60
Vout (Nom) (V) 50
Iout (Max) (A) 26
Output Power (W) 1300
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck Boost- 4 Switch

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.

PDF | HTML
TIDT418.PDF (609 K)

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

TIDMDW7.PDF (497 K)

Detailed schematic diagram for design layout and components

TIDMDX1.PDF (412 K)

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

TIDMDW9.PDF (454 K)

Detailed overview of design layout for component placement

TIDMDX0.ZIP (3697 K)

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

TIDCGW0.ZIP (2367 K)

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

TIDMDW8.PDF (1502 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

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

LM5177078V wide-VIN bidirectional 4-switch buck-boost controller

Data sheet: PDF | HTML
Power modules (integrated inductor)

TPSM8632523-V to 17-V input voltage, 3-A Eco-mode synchronous buck module

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report Four-Switch, Buck-Boost DC/DC Converter Reference Design PDF | HTML Mar. 12, 2025

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