Texas Instruments

LP2981AIM5-5.0

LP2981AIM5-5.0 Description

The LP2981AIM5-5.0 from Texas Instruments is a fixed 5V, 100mA low-dropout (LDO) linear voltage regulator in a compact SOT-23-5 package. Designed for precision voltage regulation, it features a low dropout voltage of 0.37V at 100mA, making it ideal for battery-powered and space-constrained applications. With a wide input voltage range up to 16V, it supports diverse power sources while maintaining stable output. The device is RoHS3 compliant and REACH unaffected, ensuring environmental compliance. Although marked as obsolete, it remains a reliable choice for legacy designs due to its robust performance and TI's proven quality.

LP2981AIM5-5.0 Features

• Fixed 5V Output: Ensures stable voltage for sensitive loads.
• Ultra-Low Quiescent Current (95 µA): Minimizes power loss in standby modes.
• High PSRR (63dB at 1kHz): Effectively suppresses input noise for clean output.
• Enable Pin: Allows for power management via external control.
• Protection Features: Includes over-current, over-temperature, and short-circuit protection for enhanced reliability.
• Low Dropout (0.37V @ 100mA): Optimizes efficiency in low-voltage differential scenarios.
• Surface-Mount (SOT-23-5): Compact footprint suits portable and space-limited designs.

LP2981AIM5-5.0 Applications

• Battery-Powered Devices: Ideal for IoT sensors, wearables, and handheld electronics due to low Iq and dropout.
• Noise-Sensitive Circuits: Suitable for RF modules, ADCs, and DACs thanks to high PSRR.
• Industrial Control Systems: Reliable in PLC I/O modules and sensor interfaces with robust protection features.
• Legacy Designs: A trusted solution for maintenance or upgrades of older systems requiring 5V regulation.

Conclusion of LP2981AIM5-5.0

The LP2981AIM5-5.0 excels in delivering precision 5V regulation with low noise, low dropout, and minimal quiescent current, making it a versatile choice for battery-operated and noise-critical applications. While obsolete, its TI pedigree, compact size, and protection mechanisms ensure continued relevance in legacy and low-power designs. Engineers seeking a reliable, space-efficient LDO for 5V rails should consider this regulator despite its status, especially where proven performance outweighs obsolescence concerns.