LM117/LM317 Output Voltage Calculation

Formula

Vout = 1.25 × (1 + R2/R1)

Typical R1 values are 220Ω or 240Ω; 150Ω or 470Ω also work.

Note: the LM317 input voltage must be at least 1.5V above the output voltage.

• Maximum output current: 1.5A
• Maximum operating temperature: 125°C
• Maximum input-output voltage differential: 38V