Texas Instruments

LM317LCPK

The LM317LCPK is a linear voltage regulator integrated circuit (IC) manufactured by Texas Instruments. It is a member of the LM317 family of adjustable voltage regulators, which are widely used for providing a stable and adjustable output voltage from an input voltage source.

Description:

The LM317LCPK is available in a plastic TO-220 package, which is suitable for through-hole soldering on a printed circuit board (PCB). It is a three-terminal device, with pins for input voltage (Vin), output voltage (Vout), and reference voltage/adjustment (Adj).

Features:

1. Adjustable output voltage: The LM317LCPK can provide an output voltage adjustable from 1.25V to around 37V, depending on the input voltage and external components used.
2. High input voltage range: It can accept input voltages from 3V to 40V, making it suitable for a wide range of applications.
3. Output current capability: The LM317LCPK can deliver output currents up to 1.5A, depending on the heatsink used and the temperature conditions.
4. Internal current limit and thermal shutdown: The regulator has built-in protection features to prevent overload and overheating.
5. Low dropout voltage: The LM317LCPK has a low dropout voltage, which means it can regulate the output voltage even when the input voltage is close to the desired output voltage.
6. External components for output voltage setting: The output voltage can be set using external resistors connected to the Adj pin, allowing for precise voltage regulation.

Applications:

1. Power supply voltage regulation: The LM317LCPK is commonly used in linear power supplies to provide a stable and adjustable output voltage.
2. Battery charging circuits: It can be used to create a constant voltage/constant current battery charging circuit.
3. LED dimming and driving: The LM317LCPK can be used to regulate the voltage and current supplied to LEDs, allowing for dimming and efficient driving.
4. Laboratory power supplies: It is often used in benchtop power supplies for its adjustability and stability.
5. Audio and instrumentation equipment: The LM317LCPK can provide clean and stable power to sensitive audio and measurement equipment.

In summary, the LM317LCPK is a versatile and widely used adjustable linear voltage regulator that offers a stable output voltage, high input voltage range, and built-in protection features. It is suitable for a variety of applications, including power supplies, battery charging circuits, LED driving, and laboratory equipment.