The LM2940SX-5.0/NOPB is a fixed-output low-dropout (LDO) linear voltage regulator from Texas Instruments, designed to provide a stable 5V output with an input voltage range of 7V to 40V. Housed in a compact TO-252 (DPAK) package, this device is optimized for applications requiring robust voltage regulation in industrial, automotive, and consumer electronics. Its high input voltage tolerance and low quiescent current make it suitable for battery-powered and line-operated systems where reliable power delivery under varying load conditions is critical.

Key Features

This regulator delivers up to 1A continuous output current with a dropout voltage of 1.2V at full load, ensuring efficient operation even under tight input margins. It features integrated protections such as thermal shutdown, current limiting, and safe operating area (SOA) protection, safeguarding against overloads and short circuits. The LM2940SX-5.0/NOPB operates across an extended temperature range of -40°C to +150°C, suitable for harsh environments. It offers low noise (typical 50 µV RMS) and high power supply rejection ratio (PSRR) of 65 dB at 1 kHz, ensuring clean power delivery to sensitive circuits.

Applications

Primarily used in industrial control systems, automotive electronics (e.g., infotainment, sensor interfaces), and telecom equipment, this regulator efficiently powers microcontrollers, analog circuits, and peripherals in battery-operated or high-voltage applications. It is also employed in LED drivers, medical devices, and instrumentation where stable 5V rails are required under fluctuating input voltages. Its compact DPAK package and wide input range make it ideal for space-constrained designs needing reliable voltage regulation.

Summary

The LM2940SX-5.0/NOPB combines high-current capability, wide input voltage tolerance, and robust protection features, making it a reliable choice for power-sensitive applications in industrial, automotive, and consumer systems. Its thermal resilience, low noise, and compact form factor simplify integration into designs demanding stable 5V output in demanding environments. This regulator is essential for engineers seeking a dependable LDO solution with broad operating flexibility.