LM4864MX/NOPB

Audio Amplifiers Overview

The LM4864MX/NOPB is a single-channel mono audio power amplifier manufactured by Texas Instruments, formerly National Semiconductor. It utilizes Class-AB topology with analog input and operates on a single power supply ranging from 2.7 V to 5.5 V. The device delivers up to 725 mW of output power into an 8-ohm load at 5 V, or 850 mW into a 4-ohm load. It features a total harmonic distortion plus noise of 0.7% and draws 3.6 mA of quiescent current. The component is housed in an 8-pin VSSOP package and supports surface-mount installation across a temperature range of -40°C to +85°C.

Audio Amplifiers Feature Summary

• Integrates shutdown mode for extended battery life in portable applications
• Provides high-efficiency Class-AB amplification with low quiescent current consumption
• Supports direct connection to microphones without requiring external coupling capacitors

Audio Amplifiers Applications

• Portable media players and MP3 devices
• Mobile phones and handheld communication devices
• Personal digital assistants (PDAs)
• Laptop computers and notebook PCs

Audio Amplifiers Procurement Notes

Verify the manufacturer designation as Texas Instruments, which acquired National Semiconductor, when sourcing this component. Confirm the suffix /NOPB indicates lead-free and RoHS compliance. Ensure the package type matches the required VSSOP-8 footprint for your PCB layout. Cross-reference the specific revision level if strict historical consistency with legacy National Semiconductor documentation is required for your design.

Audio Amplifiers Selection Notes

Select this amplifier for designs requiring a balance between audio fidelity and power efficiency in battery-operated systems. The VSSOP-8 package offers a compact solution for space-constrained mobile electronics. Consider the 8-ohm versus 4-ohm load performance specifications based on your speaker impedance requirements. Verify that the 2.7 V minimum operating voltage aligns with your system's battery discharge curve.

Audio Amplifiers Part Context

This component belongs to the LM4864 series of audio amplifiers designed for portable consumer electronics. The family includes variants such as LM4864M and LM4864MM, differing primarily in packaging styles like SOIC and MSOP. The LM4864MX variant specifically denotes the VSSOP package option, providing a smaller outline suitable for high-density board layouts while maintaining identical electrical characteristics to other pin-compatible versions in the series.

Audio Amplifiers Replacement Considerations

• LM4864MMX/NOPB
• LM4864M/NOPB