LM4875M/NOPB

Audio Amplifiers Overview

The LM4875M/NOPB is a single-channel Class-AB audio power amplifier manufactured by Texas Instruments, part of the Boomer series. It delivers up to 1W output power into an 8-ohm load with 0.6% THD+N. The device operates on a supply voltage range of 2.7V to 5.5V and features integrated DC volume control, headphone sensing for mode switching between bridge-tied speaker and single-ended headphone outputs, pop suppression, and thermal shutdown protection.

Audio Amplifiers Feature Summary

• Integrates precision DC voltage volume control for direct interface with digital potentiometers or microcontrollers without external coupling capacitors.
• Features automatic headphone sensing circuitry that switches operation between bridge-tied loudspeaker mode and single-ended headphone mode based on impedance detection.
• Includes built-in 'click-and-pop' suppression circuitry to minimize audible transients during power-up and power-down sequences.

Audio Amplifiers Applications

• Portable MP3 players and digital audio media devices
• Mobile phones and handheld communication devices
• Personal navigation systems (GPS) and automotive infotainment units

Audio Amplifiers Procurement Notes

Verify the manufacturer designation carefully, as National Semiconductor was acquired by Texas Instruments; current production utilizes the TI brand. Confirm the suffix /NOPB indicates lead-free and RoHS compliance. Ensure the package variant matches the required footprint, as the M suffix denotes a specific SOIC-8 body style distinct from other package options in the family.

Audio Amplifiers Selection Notes

Select this component when a mono amplifier with integrated volume control is required to reduce external component count. It is suitable for applications needing automatic source switching between speakers and headphones. Consider alternative models if stereo output or higher power efficiency classes are necessary for the specific design constraints.

Audio Amplifiers Part Context

This component belongs to the LM4875 family of Boomer audio amplifiers designed for low-voltage portable electronics. It shares functional similarities with the LM4871 but offers different power handling characteristics. The device represents a transition period product where National Semiconductor branding may appear alongside Texas Instruments manufacturing standards.

Audio Amplifiers Replacement Considerations

LM4875MX/NOPB: Identical function with reel packaging instead of tube.