Texas Instruments

LM317DCY  

Linear & Switching Voltage Regulators

LM317DCY Description

The LM317DCY from Texas Instruments is a highly reliable, adjustable positive linear voltage regulator designed for a wide range of power supply applications. Housed in a compact SOT223-4 surface-mount package, it delivers a robust 1.5A output current with an input voltage range up to 40V and an adjustable output voltage from 1.25V to 37V. Its low quiescent current (10 mA) and high PSRR (64dB ~ 57dB at 120Hz) ensure stable performance in noise-sensitive environments. The device is RoHS3 compliant and features over-current, over-temperature, and short-circuit protection, making it suitable for demanding industrial and consumer applications.

LM317DCY Features

• Adjustable Output (1.25V–37V): Provides flexibility for diverse voltage requirements.
• High Current Capability (1.5A): Supports power-hungry loads without external pass transistors.
• Wide Input Range (Up to 40V): Accommodates varying input sources.
• Excellent Line/Load Regulation: Ensures stable output under fluctuating conditions.
• Built-in Protections: Over-current, over-temperature, and short-circuit safeguards enhance reliability.
• Low Quiescent Current (10 mA): Optimizes efficiency in battery-operated systems.
• Surface-Mount (SOT223-4): Ideal for space-constrained PCB designs.
• Industrial Temperature Range (0°C to 125°C): Suitable for harsh environments.

LM317DCY Applications

• Bench Power Supplies: Adjustable output makes it ideal for lab equipment.
• Battery Chargers: Precise voltage control for Li-ion/NiMH charging circuits.
• Industrial Control Systems: Robust protection features ensure longevity in factory automation.
• Consumer Electronics: Used in audio amplifiers, LED drivers, and portable devices.
• Automotive Electronics: Stable performance under wide temperature variations.

Conclusion of LM317DCY

The LM317DCY stands out as a versatile, high-performance voltage regulator, combining adjustability, high current output, and robust protection in a compact form factor. Its wide operating range and reliability make it a preferred choice for engineers designing power supplies, battery management systems, and industrial controls. Texas Instruments’ reputation for quality further ensures its suitability for mission-critical applications.

LM317DCY Documents

Download datasheets and manufacturer documentation for LM317DCY

Datasheets :

LM317KCE3      

PCN Design/Specification :

LM317 21/Jul/2020       LM317 31/Oct/2016