Overview of STMicroelectronics LM117K

The STMicroelectronics LM117K is a popular adjustable voltage regulator IC, widely used for various applications requiring a stable and adjustable voltage source. It is an essential component in power supply circuits, commonly used in both commercial and industrial electronics.

Key Features

* Adjustable Output Voltage: The LM117K allows the output voltage to be adjusted from 1.25V to 37V, making it versatile for different voltage levels in a wide range of applications.
* High Output Current: Capable of delivering up to 1.5A of output current with proper heat sinking, which makes it suitable for medium to high-power applications.
* Regulation Performance: Offers excellent regulation both line and load, ensuring stable voltage even under fluctuating input voltages or varying load conditions.
* Thermal Overload Protection: Integrated thermal protection ensures the device shuts down in case of overheating, preventing damage to the regulator and the surrounding circuitry.
* Short Circuit Protection: Built-in short circuit protection enhances the safety and reliability of the system by shutting off the output during a fault condition.
* Low Dropout Voltage: The LM117K features a low dropout voltage, allowing it to regulate the output even with small differences between the input and output voltages.

Electrical Specifications

* Output Voltage Range: 1.25V to 37V (adjustable)
* Output Current: 1.5A (maximum, with proper heat sinking)
* Input Voltage Range: 3V to 40V (depending on the output voltage)
* Dropout Voltage: Typically 3V at 1.5A output
* Line Regulation: 0.01%/V (typical)
* Load Regulation: 0.1% (typical)
* Quiescent Current: 50mA (typical)
* Thermal Shutdown: 150°C (typical)
* Short-Circuit Current Limit: 2.5A (typical)

Applications

The LM117K is commonly used in various applications including:

* Power Supply Circuits: Ideal for providing adjustable power supplies where the input voltage can vary.
* Battery Chargers: Used in designing battery charging circuits with adjustable charging voltages.
* Regulated Power Supply Units (PSUs): Integrated into PSUs for industrial, medical, and communication devices requiring stable and adjustable voltage.
* Test Equipment: Utilized in test systems requiring a reliable and adjustable power source.

Package Type

The LM117K comes in a TO-3 metal can package, which ensures good heat dissipation for high-power applications. This package is suitable for applications requiring the regulator to operate at higher currents and under varying thermal conditions.

Conclusion

The STMicroelectronics LM117K is a robust and reliable voltage regulator that offers versatility, excellent protection features, and a wide output voltage range. Its ability to regulate a broad range of input voltages while delivering a stable output makes it a popular choice in applications demanding adjustable and reliable power regulation.