LM317 Current Regulator Calculator

LM317 Current Regulator

An integrated circuit called the LM317 current regulator is made to maintain a steady output current regardless of changes in input voltage and load resistance.
It functions by varying its output voltage to sustain a steady current flow via the load, which makes it perfect for applications needing accurate and reliable current control.

Keeping an even and dependable current flow via electrical and electronic circuits is the main goal of the LM317 current regulator.
By keeping the current at safe levels, it helps prevent damage to delicate components and guarantees that electronic equipment operate consistently under a range of operating situations.

Understanding LM317 Current Regulator:

The LM317 stands as a widely favored adjustable three-terminal positive voltage regulator integrated circuit (IC), capable of delivering a maximum output current of 1.5A. Its versatility finds extensive utilization across diverse domains such as power supplies, audio amplifiers, and numerous other electronic circuits.

Here are some key points about the LM317 current regulator:

Adjustable output voltage: With its capability to regulate an output voltage spanning from 1.25V to 37V, the LM317 emerges as a versatile component well-suited for an array of applications.

High output current: With a maximum output current rating of 1.5A, the IC proves itself suitable for applications demanding substantial current delivery.

Low dropout voltage:Featuring a low dropout voltage of 1.5V, the LM317 can effectively function even with comparatively low input voltages while ensuring a consistent and stable output voltage.

Internal current limiting:Incorporating internal current limiting, the LM317 safeguards against potential damage to the IC during instances of overload or short circuit, enhancing its reliability and durability.

Temperature detection: Equipped with a built-in temperature detection circuit, the LM317 is capable of automatically shutting down in the event of overheating, ensuring the protection of the IC from potential damage due to excessive temperatures.

Adjustable current source: By linking the output to a load and adjusting the input voltage accordingly, the LM317 can function as a current source, offering the flexibility to set the desired current output.

Wide operating temperature range:With an operational capacity spanning from -40°C to 125°C, the LM317 proves its adaptability for deployment across diverse environments, ensuring reliability and functionality in varied temperature conditions.

Low noise and ripple:Characterized by a low noise and ripple specification, the LM317 emerges as an ideal choice for applications demanding a pristine output voltage, ensuring minimal interference and optimal performance in such scenarios.


  • LED Lighting
  • Battery Charging
  • Power Supply Regulation
  • Audio Amplifiers
  • Variable Voltage Regulators

In essence, the LM317 stands as a versatile and extensively utilized integrated circuit (IC), serving diverse applications necessitating a steady and adaptable output voltage or current.

You can use our online regulator calculator to determine the resistor value in an electrical circuit given the specified LM317 current or regulator value. Students studying electrical engineering frequently use this tool for circuit analysis and computations. With the help of our intuitive electrical circuit calculator, you can streamline your circuit design and guarantee precise resistor selection. Use this helpful online resource to improve your comprehension of electrical circuits and make the most out of your wiring.

Note : Don’t end with comma ( , )

Current (I)
\[Resistor\:Value = V Ref / Desired \:Output\:Current\]

Any questions? Drop them here!