LM4873MTE-1

Audio Amplifiers Overview

The LM4873MTE-1 is a dual Class-AB audio amplifier manufactured by National Semiconductor, part of the Boomer series. It provides up to 3W output power into a 3-ohm load or 440mW into an 8-ohm load with a single supply voltage ranging from 2V to 5.5V. The device integrates stereo headphone functionality and features input multiplexing for seamless switching between line-in and headphone inputs. Key electrical characteristics include low total harmonic distortion plus noise and built-in thermal protection.

Audio Amplifiers Feature Summary

• Integrates stereo headphone amplifier with automatic input multiplexing to switch between line-in and headphone sources without pop noise.
• Includes internal circuitry for pop-and-click suppression during power-up and shutdown sequences.
• Features thermal shutdown protection to safeguard the device under high temperature or overload conditions.

Audio Amplifiers Applications

• Portable multimedia players requiring integrated audio amplification
• Mobile phones and smartphones with stereo speaker and headphone outputs
• Personal digital assistants (PDAs) and handheld gaming devices

Audio Amplifiers Procurement Notes

Verify the manufacturer origin as National Semiconductor, noting that Texas Instruments acquired NSC. Confirm the package type is 28-TSSOP with exposed pad. Ensure the suffix indicates the specific variant. Check RoHS compliance status if required for your assembly process. Validate the datasheet version matches the production batch requirements.

Audio Amplifiers Selection Notes

Select this component when a single IC solution is needed for both stereo speakers and headphones in battery-powered devices. It is suitable for applications requiring low supply voltage operation down to 2V. Consider the 28-pin TSSOP package constraints for PCB layout. Verify that the 3W output capability meets the acoustic requirements of the target enclosure.

Audio Amplifiers Part Context

This part belongs to the National Semiconductor Boomer audio amplifier family, designed for low-voltage, high-power applications. The LM4873 specifically addresses the need for combined speaker and headphone amplification in compact mobile electronics. It simplifies system design by integrating multiple audio functions into one small footprint.

Audio Amplifiers Replacement Considerations

Check for LM4873MTE/NOPB as a potential equivalent from Texas Instruments. Verify pin compatibility and electrical specifications before substitution. Ensure the replacement supports the same 28-TSSOP package and thermal requirements.