LM4666SD/NOPB

Audio Amplifiers Overview

The LM4666SD/NOPB is a filterless, high-efficiency stereo switching audio amplifier manufactured by Texas Instruments. It delivers 1.2W of output power into an 8-ohm load with a supply voltage range of 2.7V to 5.5V. The device operates at a fixed switching frequency of 2.3MHz and features a shutdown mode for power conservation. It utilizes a compact MSOP-10 package suitable for space-constrained portable applications.

Audio Amplifiers Feature Summary

• Filterless design eliminates the need for external output filters
• High efficiency switching operation reduces heat generation
• Integrated thermal shutdown protection prevents damage during overload

Audio Amplifiers Applications

• Portable media players
• Mobile phones
• Personal digital assistants

Audio Amplifiers Procurement Notes

Verify the manufacturer designation as Texas Instruments, which acquired National Semiconductor. Confirm the suffix NOPB indicates lead-free and RoHS compliance. Ensure the package type matches the required MSOP-10 footprint for your PCB layout.

Audio Amplifiers Selection Notes

Select this component for stereo audio applications requiring minimal external components. It is suitable for single-supply systems operating between 2.7V and 5.5V. Consider the 2.3MHz switching frequency to avoid interference with AM radio bands in sensitive environments.

Audio Amplifiers Part Context

This part belongs to the LM466x series of Class-D audio amplifiers designed for low-power consumer electronics. It serves as a direct replacement for older National Semiconductor parts within the same family, maintaining compatibility with existing designs while offering improved efficiency and reduced component count.