SPVA023 July   2025 LM25184 , LM2611 , LM27761 , LM5158 , LMR33640 , TLV171 , TPS63700

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Methods to Design a Negative Power Supply from Positive Voltage 
    1. 2.1 Generate Negative Power Supply by Using a Charger Pump
    2. 2.2 Generate Negative Power Supply Using An Inverter Regulator
    3. 2.3 Generate Negative Power Supply Using A Buck Regulator
    4. 2.4 Generate Negative Power Supply Using A Cuk Regulator
    5. 2.5 Generate Negative Power Supply With A Fly-Back Converter
  6. 3Summary
  7. 4References

Abstract

Negative power supply is required and widely used in medical imaging systems and other electronic systems, although positive power supply is dominant in all electronic systems. Unlike positive power supply, designs for negative power supply often are a challenge for junior engineers and not straightforward. Engineers also have less options for best negative power supply designs in the market compared to the positive power supply. This application note introduces several methods to convert a positive power supply to a negative power supply to meet miscellaneous requirements from engineers under complexity, performance, and package constraints.