Texas Instruments

LP2981AIM5X-5.0

LP2981AIM5X-5.0 Description

The LP2981AIM5X-5.0 from Texas Instruments is a fixed-output, low-dropout (LDO) linear voltage regulator designed to deliver a stable 5V output with a maximum current of 100mA. It operates with an input voltage range up to 16V, making it suitable for applications requiring voltage regulation from higher supply rails. Despite its obsolete status, the device remains relevant for legacy designs due to its robust performance, low quiescent current (95 µA), and excellent power supply rejection ratio (63dB at 1kHz). Packaged in a compact SOT23-5 surface-mount form factor, it is ideal for space-constrained applications.

LP2981AIM5X-5.0 Features

• Low Dropout Voltage: 0.37V @ 100mA ensures efficient operation even with small input-output differentials.
• Low Quiescent Current: 95 µA minimizes power consumption in battery-powered systems.
• High PSRR: 63dB (1kHz) reduces noise and ripple for sensitive analog/digital circuits.
• Protection Features: Includes over-current, over-temperature, and short-circuit protection for enhanced reliability.
• Enable Control: Allows for power management via an external enable pin.
• Wide Input Range: Supports up to 16V, accommodating various power sources.
• Moisture Sensitivity Level (MSL) 1: Suitable for extended storage and handling without baking requirements.

LP2981AIM5X-5.0 Applications

• Portable Electronics: Ideal for battery-powered devices such as sensors, wearables, and handheld instruments due to low Iq.
• Industrial Systems: Provides stable voltage for microcontroller power rails, analog circuits, and low-power peripherals.
• Automotive Electronics: Suitable for non-critical 5V subsystems where input voltage fluctuations are common.
• Embedded Systems: Used in IoT modules and FPGA/ASIC auxiliary power where noise immunity is crucial.
• Legacy Designs: Maintains compatibility with older systems requiring a reliable 5V LDO regulator.

Conclusion of LP2981AIM5X-5.0

The LP2981AIM5X-5.0 offers a balance of low power consumption, high PSRR, and robust protection features, making it a dependable choice for precision voltage regulation. While marked as obsolete, its performance characteristics ensure continued utility in low-power, noise-sensitive, and space-constrained applications. Engineers designing for legacy or cost-sensitive projects may still find this regulator advantageous due to its proven reliability and Texas Instruments' quality assurance.