Linear regulator calculator

Calculates properties of a linear regulator.

Example 1: Must calculate the resistance of R2 to have output of 12 volts when R1 value is 220 ohms and regulator is LM317View example
Example 2: Must calculate the output voltage of a 3% tolerance regulator when R1 value is 120 ohms and R2 value is 680 ohmsView example
Output voltagevolts
Resistor R1ohms
Resistor R2ohms
Reference voltagevolts
You may use one of the following SI prefix after a value: p=pico, n=nano, u=micro, m=milli, k=kilo, M=mega, G=giga

Fill in all values except the one you wish to calculate
  • Output voltage - Output voltage of the regulator circuit
  • Resistor R1 - Resistance of the resistor R1
  • Resistor R2 - Resistance of the resistor R2
  • Reference voltage - The internal reference voltage of the regulator
  • ADJ-current - The internal adjustment pin current of the regulator (typically 50uA)
  • Tolerance - The output voltage tolerance of the regulator