LM4900M/NOPB

Audio Amplifiers Overview

The LM4900M/NOPB is a bridged audio power amplifier delivering 265mW into an 8Ω load at 3.3V supply with 1% THD+N. It operates from 2.0V to 5.5V, drawing 4mA quiescent current and 0.1µA in shutdown. The device features thermal protection, click/pop suppression, and external gain configuration via resistors. Packaged in MSOP-8 (LM4900MM), it eliminates the need for output coupling capacitors.

Audio Amplifiers Feature Summary

• Bridged architecture provides differential drive without output coupling capacitors
• Externally controlled shutdown mode minimizes idle power consumption
• Integrated thermal shutdown protection safeguards against overheating
• Unity-gain stable design allows flexible external gain configuration

Audio Amplifiers Applications

• Cellular phones
• Personal Digital Assistants (PDAs)
• Portable audio applications

Audio Amplifiers Procurement Notes

Verify the specific package suffix matches the required form factor, as the LM4900 family includes MSOP, LLP, and SOP options. Confirm that the NOPB designation indicates lead-free compliance and halogen-free status per manufacturer specifications. Ensure the ordering number aligns with the exact pinout and thermal requirements of your PCB layout.

Audio Amplifiers Selection Notes

Select this component for low-voltage portable systems requiring high efficiency without external bootstrap or snubber circuits. Consider the MSOP package for space-constrained designs where thermal dissipation remains within limits. Evaluate the external resistor network to set the desired closed-loop gain while maintaining bandwidth requirements.

Audio Amplifiers Part Context

This part belongs to the Boomer® series of audio power amplifiers designed by National Semiconductor, now Texas Instruments. These amplifiers are optimized for low supply voltages and minimal external component counts. The LM4900 specifically targets mono audio applications in battery-powered devices.

Audio Amplifiers Replacement Considerations

Public confirmed substitute part numbers: LM4900MM, LM4900M, LM4900LD.