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 12KW 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. This design has a total of six phases; among them, six phases are connected in parallel for battery discharging operation, provide up to 12KW discharging power.
| Output voltage options | PMP41155.1 |
|---|---|
| Vin (Min) (V) | 28.6 |
| Vin (Max) (V) | 60 |
| Vout (Nom) (V) | 50 |
| Iout (Max) (A) | 240 |
| Output Power (W) | 12000 |
| Isolated/Non-Isolated | Non-Isolated |
| Input Type | |
| Topology | Buck Boost- 4 Switch |
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Test results for the reference design, including efficiency graphs, test prerequisites and more
Detailed overview of design layout for component placement
Complete listing of design components, reference designators, and manufacturers/part numbers
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Design file that contains information on physical board layer of design PCB
PCB layer plot file used for generating PCB design layout
Detailed schematic diagram for design layout and components
Includes TI products in the design and potential alternatives.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Test report | Multiphase, Four-Switch, Buck-Boost DC/DC Converter Reference Design | PDF | HTML | Oct 10, 2025 |
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