5V to -12V Inverting Switching Regulator

  • Rajkumar Sharma
  • 8677
  • easy
  • Tested


The DC/DC inverting switching regulators project is specifically designed to invert input voltages to negative outputs. It offer input voltage ranges from 4.5V to 6V and output -12V 100mA The MC34063A IC is heart of the project from On semiconductor. The MC33063A is a monolithic control circuit containing the primary functions required for DC-DC converters, This device consist of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This IC specially designed to be incorporated step-down, step-up, and voltage-inverting applications with minimum number of external components.


  • Input 4.5V To 6V DC
  • Output -12V 100mA
  • Output Fine Adjustable By On-board Preset
  • Header Connector for Output/Input Connections
  • Low Standby Current
  • On Board Filter To Provide Low Ripple Output
  • PCB Dimensions 31.75mmX34.93MM

PR1=Output Voltage Adjust

CN1=Output -12V 100mA (Negative 12V)

CN2=Supply Input 4.5V to 6V DC



Parts List




  • Hello Rajkumar, Is there any reason why I can’t apply a greater input voltage? What I need is a +9V to -9V voltage inverter. Thanks, mike

    3 years ago
    • Electronics Lab

      According to the datasheet the input voltage can be in the range of 4-6V in the inverting configuration.

      3 years ago
      • Thanks, yes I saw that in the datasheet but still can’t understand why. Shall have to build one and see what happens.

        3 years ago
  • jawad

    my output is not -12, but its increasing in minus ,,, reaching -24 and its going on , whats the reason ??

    3 years ago
    • admin

      Please check for correct parts alignment, especially for D1 diode and capacitors and for correct voltage feedback to the IC (the resistor divider that goes to PIN5)

      2 years ago

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