MP7731DF-LF-P

Overview

The MP7731DF-LF-P is a mono, fully integrated Class D audio amplifier manufactured by Monolithic Power Systems. It delivers up to 30W of output power into a 4Ω load with a 16.5V supply voltage. The device operates on a single supply voltage ranging from 9.5V to 18V and features an integrated full bridge output drive with four 180mΩ power MOSFETs. Key electrical characteristics include a typical Total Harmonic Distortion plus Noise (THD+N) of 0.1% across the full audio range and approximately 90% efficiency at 5W output. The component includes built-in short circuit protection, thermal shutdown, and pop elimination circuits for startup and shutdown sequences.

Feature Summary

• Integrates full bridge output drive with four low-resistance power MOSFETs to minimize external component count and solution size.
• Features integrated pop and click suppression circuits during startup and shutdown to ensure silent operation.
• Includes comprehensive protection mechanisms such as short circuit protection and thermal shutdown for reliable performance.

Applications

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

Procurement Notes

Verify the specific suffix LF-P against official Monolithic Power Systems documentation to confirm lead-free status and tape-and-reel packaging specifications. Ensure compatibility with the required operating temperature range and supply voltage constraints before integration. Cross-reference the manufacturer part number with authorized distributors to validate authenticity and current production status.

Selection Notes

Select this component for applications requiring high-efficiency mono audio amplification in space-constrained designs. It is suitable for single-supply operations between 9.5V and 18V where low distortion and high power density are critical. Consider the integrated protection features for robust system reliability without additional external safeguarding components.

Part Context

This component belongs to the MP7731 series of second-generation fully integrated Class D audio amplifiers from Monolithic Power Systems. The series is designed to dramatically reduce solution sizes by integrating power switches and control logic. It represents a compact alternative to discrete amplifier solutions, targeting portable and display-based audio applications.

Replacement Considerations

Publicly confirmed substitute part numbers for the MP7731DF-LF-P were not identified in the provided source material. Verify potential replacements by comparing pinout configurations, power ratings, and package dimensions with official MPS documentation.