The LM2991S/NOPB is a versatile, adjustable negative voltage regulator from Texas Instruments designed to provide stable output voltages ranging from -1.23V to -37V. Supplied in a TO-263 (D2PAK) package, this device supports input voltages up to -40V, making it suitable for applications requiring robust regulation of negative voltage rails. The LM2991S/NOPB features internal thermal overload protection and current limiting, ensuring reliable operation under adverse conditions.

Key Features

This regulator offers an adjustable output voltage that can be set using external resistors, providing flexibility for different application requirements. It includes a low quiescent current of typically 5mA, contributing to energy efficiency in battery-operated systems. The LM2991S/NOPB also has a maximum dropout voltage of 1.3V at full load, enabling efficient operation even when the input voltage approaches the regulated output voltage. Its built-in protection mechanisms, including short-circuit protection and thermal shutdown, enhance reliability and durability. Operating over an extended temperature range of -40°C to +125°C, it ensures stable performance across various environmental conditions.

Applications

Ideal for use in industrial control systems, telecommunications equipment, and test instrumentation, the LM2991S/NOPB provides dependable regulation of negative voltage supplies in scenarios where precision and stability are critical. It is well-suited for audio equipment, power supplies, and laboratory instruments where accurate negative voltage levels are necessary. Additionally, its ability to handle high input voltages makes it particularly useful in automotive electronics and other environments with fluctuating or noisy power sources.

Summary

The LM2991S/NOPB combines adjustable output capability, low quiescent current, and comprehensive protection features, making it an excellent choice for applications requiring reliable negative voltage regulation. Its wide input voltage range and thermal tolerance facilitate seamless integration into systems demanding stable performance under varying conditions. This makes it an essential component for engineers designing circuits that need precise and dependable voltage regulation, especially in industrial, automotive, and consumer sectors.