LM317MDT/NOPB

The LM317MDT/NOPB is a versatile adjustable voltage regulator manufactured by Texas Instruments. It is part of the LM317 family, which is widely used in various electronic applications for providing a stable output voltage. Here’s a detailed description of its features and specifications:

General Overview:

• Type: Adjustable Voltage Regulator
• Manufacturer: Texas Instruments
• Package Type: TO-220 (often referred to as MDT in the part number)
• Lead Count: Typically 3 leads (Input, Output, and Adjust)

Key Features:

1. Adjustable Output Voltage: The LM317 allows for an output voltage that can be adjusted from 1.25V to 37V, making it suitable for a wide range of applications.
2. Output Current: It can provide a maximum output current of 1.5A, which is sufficient for many low to medium power applications.
3. Thermal Overload Protection: The device includes built-in thermal protection, which prevents damage due to overheating.
4. Short-Circuit Protection: The LM317 is designed to protect itself from short circuits, ensuring reliability in various operating conditions.
5. Line Regulation: It offers excellent line regulation, typically around 0.01%/V, ensuring that the output voltage remains stable despite variations in input voltage.
6. Load Regulation: The load regulation is also impressive, typically around 0.1% for a load change from 0 to 1.5A.
7. Low Dropout Voltage: The dropout voltage is relatively low, typically around 3V at full load, which allows for efficient operation even with a small difference between input and output voltages.

Electrical Characteristics:

• Input Voltage Range: The input voltage can range from 3V above the output voltage up to 40V.
• Temperature Range: The operating temperature range is typically from -40°C to +125°C, making it suitable for various environmental conditions.
• Quiescent Current: The quiescent current is low, which helps in power-sensitive applications.

Applications:

The LM317MDT/NOPB is commonly used in:

• Power supplies for electronic devices
• Battery chargers
• Adjustable power supplies
• Voltage regulation in automotive applications
• Circuit protection and regulation in consumer electronics

Additional Information:

• NOPB: The "NOPB" suffix indicates that the part is lead-free, complying with RoHS (Restriction of Hazardous Substances) standards, which is important for environmentally friendly manufacturing practices.
• Pin Configuration: The typical pin configuration includes:
  • Pin 1: Adjust (for setting the output voltage)
  • Pin 2: Output (the regulated output voltage)
  • Pin 3: Input (the unregulated input voltage)

Conclusion:

The LM317MDT/NOPB from Texas Instruments is a reliable and flexible adjustable voltage regulator that is widely used in various electronic applications. Its combination of adjustable output, thermal protection, and low dropout voltage makes it a popular choice for engineers and designers looking to implement efficient voltage regulation in their circuits.