M317 is an adjustable voltage regulator IC. In this project, we will be making a 1.25V to 37V LM317 adjustable voltage regulator circuit. This IC can provide an output current up to 1Amp. It’s a three-terminal positive voltage regulator IC.

This voltage regulator requires only two external resistors to set the supply voltage. It has a line regulation of around 0.01% and load regulation of about 0.1%. It also has a current limiter and thermal protection.

Technical Specification:

• Input: DC:0-30v / AC:0-22V
• Output: DC 1.25-28V
• Output current: 2A(Max)
• The minimum differential between input and output: 3 volts; input must be higher than the output voltage above 3V to be regulated. Buck, not boost, when input 5V output 1.25-2V, not 6V
• Circuit board size: approx. 69mm*50mm*27mm (L x W x H)

Features:

• Adjustable output voltage range from 1.25 V to 37 V
• Output current more than 1.5 A
• Internal short-circuit current limiter
• Thermal overload protection
• Output safe-area compensation

Applications:

• Power bank solutions
• Power line communication modems
• Power over ethernet (PoE)
• Power quality meters
• Power substation controls
• Private branch exchanges (PBX)
• Programmable logic controllers
• RFID readers
• Refrigerators
• Signal or waveform generators
• Software-defined radios (SDR)
• Washing machines: high-end and low-end
• X-rays: baggage scanners, medical, and dental