+/-40-V inverting buck-boost with auxiliary output reference design


Design files


This reference design uses the TPS54560B in an inverting buck-boost topology to generate a -40-V output from a +5-V input. An auxiliary winding generates a +40-V output with reference to the same ground. For applications needing a positive and negative voltage, the buck topology provides a low-noise output with a minimal component count.

  • Less than 0.5% voltage ripple on each output for noise sensitive loads
  • Zener clamp keeps output voltages balanced during extreme cross loading 
  • Low component count requires only 26 power components
  • Compact size (40mm x 55mm) minimizes solution size area
Output voltage options PMP22343.1 PMP22343.2
Vin (Min) (V) 4.9 4.9
Vin (Max) (V) 5.1 5.1
Vout (Nom) (V) 40 -40
Iout (Max) (A) .125 -.125
Output Power (W) 5 5
Isolated/Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC
Topology Buck Boost- Inverting Buck Boost- Inverting
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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.

TIDT158.PDF (1130 K)

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

TIDM445.PDF (128 K)

Detailed schematic diagram for design layout and components

TIDM446.PDF (318 K)

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

TIDM447.PDF (109 K)

Detailed overview of design layout for component placement

TIDM449.ZIP (550 K)

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


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

TIDM448.PDF (479 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

TPS54560B4.5-V to 60-V input, 5-A, step-down DC-DC converter with Eco-mode™

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report +/-40-V Inverting Buck-Boost With Auxiliary Output Reference Design Feb. 03, 2020

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