LM317D2T-TR

The LM317D2T-TR is a versatile adjustable voltage regulator manufactured by STMicroelectronics. It is designed to provide a stable output voltage that can be adjusted from 1.25V to 37V, making it suitable for a wide range of applications, including power supplies, battery chargers, and other electronic circuits requiring a regulated voltage.

Key Features:

1. Adjustable Output Voltage: The LM317D2T-TR allows users to set the output voltage to their desired level using external resistors. This flexibility makes it ideal for custom applications.

2. Output Current: The device can deliver up to 1.5A of output current, which is sufficient for many low to medium power applications.

3. Thermal Overload Protection: The LM317D2T-TR includes built-in thermal protection, which prevents the device from overheating and ensures reliable operation under varying load conditions.

4. Short-Circuit Protection: This regulator is equipped with short-circuit protection, safeguarding the device and the connected load in case of a fault condition.

5. Low Dropout Voltage: The LM317D2T-TR features a low dropout voltage, typically around 3V at full load, which allows it to maintain regulation even when the input voltage is close to the output voltage.

6. Wide Input Voltage Range: The input voltage range for the LM317D2T-TR is from 3V to 40V, providing flexibility in power supply design.

7. Package Type: The LM317D2T-TR is available in a TO-220 package, which is a common choice for power devices due to its good thermal performance and ease of mounting.

8. Temperature Range: The device operates over a temperature range of -40°C to +125°C, making it suitable for industrial and automotive applications.

Applications:

• Power Supply Circuits: The LM317D2T-TR is widely used in linear power supplies where adjustable output voltage is required.
• Battery Chargers: Its ability to provide a stable output voltage makes it suitable for charging various types of batteries.
• LED Drivers: The adjustable output can be used to drive LEDs at a constant current.
• Regulated Power Sources: It can be used in circuits that require a stable voltage reference.

Electrical Characteristics:

• Input Voltage (Vin): 3V to 40V
• Output Voltage (Vout): Adjustable from 1.25V to 37V
• Output Current (Iout): Up to 1.5A
• Dropout Voltage (Vdrop): Typically 3V at full load
• Line Regulation: Typically 0.01%/V
• Load Regulation: Typically 0.1%/A

Conclusion:

The LM317D2T-TR from STMicroelectronics is a reliable and flexible adjustable voltage regulator that is widely used in various electronic applications. Its combination of features, including thermal and short-circuit protection, low dropout voltage, and a wide input voltage range, makes it a popular choice among engineers and designers looking for a robust solution for voltage regulation.