MP7731DF-LF

Overview

The MP7731DF-LF is a mono, fully integrated Class D audio amplifier manufactured by Monolithic Power Systems. It delivers up to 30W of output power into a 4-ohm load with a supply voltage of 16.5V. The device operates within a supply voltage range of 9.5V to 18V and features integrated 180mΩ power MOSFETs. Key electrical characteristics include typical total harmonic distortion plus noise (THD+N) of 0.1% and approximately 90% efficiency at 5W output. It incorporates start-up/shut-down pop elimination, short circuit protection, thermal shutdown, and mute/standby modes.

Feature Summary

• Integrates four 180mΩ power switches for compact solution size
• Provides turn-on and turn-off click and pop suppression
• Includes integrated short circuit and thermal shutdown protection
• Supports full bridge output drive with low THD+N

Applications

• Flat panel LCD and PDP displays
• Notebook and multimedia computers
• Televisions and home stereos
• DVD and VCD players
• Game devices and monitors

Procurement Notes

Verify the specific suffix LF against official MPS documentation to confirm lead-free compliance status. Ensure the component matches the exact pinout and thermal requirements for the intended PCB layout. Cross-reference the datasheet revision date to confirm current manufacturing status and any potential design-in updates.

Selection Notes

Select this component for applications requiring high-efficiency mono audio amplification in space-constrained environments. The integrated power switches reduce external component count compared to discrete solutions. Verify that the system supply voltage remains within the 9.5V to 18V operating range to ensure optimal performance and reliability.

Part Context

This part belongs to the MP7731 series of second-generation Class D audio amplifiers from Monolithic Power Systems. It is designed as a direct replacement or upgrade for previous generation audio amplifier solutions, offering improved efficiency and reduced board footprint through high integration levels.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Consult official MPS documentation for recommended alternatives if this specific variant is discontinued.