LM4871M

Audio Amplifiers Overview

The LM4871M is a single-channel mono Class-AB audio power amplifier manufactured by Texas Instruments, originally from the National Semiconductor Boomer series. It delivers up to 3W of continuous average output power into a 3Ω load with less than 10% Total Harmonic Distortion (THD) when powered by a 5V supply. The device operates on a single supply voltage ranging from 2V to 5.5V and features a micro-power shutdown mode with typical standby current of 0.6μA. It utilizes an 8-pin SOIC package and includes internal thermal shutdown protection.

Audio Amplifiers Feature Summary

• Bridge-tied load (BTL) architecture eliminates the need for external output coupling capacitors, bootstrap capacitors, or damping networks.
• Micro-power shutdown mode significantly reduces current consumption in portable applications when the shutdown pin is activated.
• Internal thermal shutdown protection safeguards the device against overheating during operation.
• External gain setting capability allows for flexible configuration while maintaining stability at unity gain.

Audio Amplifiers Applications

• Portable computers and laptops
• Desktop computer systems
• Low-voltage audio systems

Audio Amplifiers Procurement Notes

Verify that the component is sourced as an original Texas Instruments product, noting the acquisition of National Semiconductor. Confirm the specific suffix 'M' corresponds to the SOIC-8 package variant. Ensure RoHS compliance documentation is available if required for your manufacturing standards. Cross-reference the manufacturer part number with official TI databases to validate authenticity and revision status before procurement.

Audio Amplifiers Selection Notes

Select this amplifier for designs requiring high-fidelity audio output with minimal external component count. It is suitable for battery-powered devices due to its low quiescent current and efficient shutdown mode. Consider the 3W power capability relative to the load impedance and supply voltage constraints. Ensure the PCB layout accommodates the SOIC-8 package and provides adequate thermal dissipation for the expected power levels.

Audio Amplifiers Part Context

The LM4871 belongs to the Boomer series of audio amplifiers designed for portable electronics. Originally developed by National Semiconductor, the product line was integrated into Texas Instruments following their acquisition. This series focuses on providing high-quality audio performance in small form factors, targeting applications where space and power efficiency are critical design parameters.

Audio Amplifiers Replacement Considerations

LM4871MX/NOPB: Tape and reel version of the same SOIC-8 device. LM4871LD/NOPB: WSON-8 package variant offering similar electrical characteristics in a smaller footprint.