Small, Simple, and Efficient Voltage Inverter for Op Amp Biasing Reference Design


Design files


In this reference design, the TPS62120 provides a small, simple, and efficient voltage inverting circuit to be used for low power negative voltage rails, such as biasing an op amp.  This configuration has been tested with a full test report and operation explanation.

  • Only 6 external components required for a complete solution
  • IC available in a 2 x 2 mm SON package for smallest size
  • IC available in 3 x 3 mm SOT package for easier assembly and extra features
  • Fully integrated, user selectable output discharge function
  • 80% efficiency over a wide load range
  • Up to 50 mA output current at 5V input
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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.

SLVUA78.PDF (1197 K)

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

TIDR526.PDF (33 K)

Detailed schematic diagram for design layout and components

TIDR527.PDF (51 K)

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

TIDC370.ZIP (183 K)

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


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC converters (integrated FET)

TPS6212015V, 75mA, 96% efficiency Step-Down Converter with DCS-Control

Data sheet: PDF | HTML
AC/DC & DC/DC converters (integrated FET)

TPS6212215V, 75mA, 96% efficiency Step-Down Converter

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Application note Using the TPS62120 in an Inverting Buck-Boost Topology (Rev. C) PDF | HTML Nov. 29, 2022
Technical article How to modify a step-down converter to the inverting buck-boost topology PDF | HTML May 17, 2018
Test report PMP9752 Test Results May 02, 2014

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