MP7742DF-LF-P

Overview

The MP7742DF-LF-P is a stereo Class-D audio amplifier manufactured by Monolithic Power Systems. It delivers 2 x 15W output power into a 4Ω load at VDD = 24V, or 2 x 20W under specific conditions. The device features a single-ended output structure and integrates 250mΩ power MOSFETs to minimize solution size. Key electrical parameters include a THD+N of 0.018% at 1W in an 8Ω configuration, efficiency up to 90% at 15W with VDD=24V, and low noise of 103μV. It operates on a single supply voltage ranging from 9.5V to 28V with a switching frequency up to 1MHz.

Feature Summary

• Integrates 250mΩ power MOSFETs to significantly reduce the overall solution footprint.
• Includes built-in circuitry to eliminate pop and click noises during startup and shutdown sequences.
• Features comprehensive protection mechanisms including over-temperature and short-circuit safeguards.

Applications

• Driving 4Ω speakers in stereo single-ended configurations
• High-fidelity audio systems requiring high efficiency and low distortion
• Portable or compact audio devices where space optimization is critical

Procurement Notes

Verify the component status as Not Recommended for New Designs (NRND) before finalizing any procurement plans. Confirm that the TSSOP20 package with exposed pad matches your PCB layout requirements. Ensure compatibility with existing designs if replacing older units, as this part may not be suitable for new product development cycles.

Selection Notes

Select this model when a stereo Class-D amplifier with integrated power FETs is required for single-supply operation between 9.5V and 28V. It is appropriate for applications demanding high efficiency up to 90% and low total harmonic distortion. Consider the TSSOP20 package constraints and ensure thermal management aligns with the specified operating temperature range of -40°C to +85°C.

Part Context

This component belongs to the MPS full-integrated series of audio amplifiers, designed to replace discrete solutions by combining control logic and power stages. It utilizes a proprietary variable frequency topology to achieve linear performance and fast response times comparable to Class-AB amplifiers while maintaining the efficiency of Class-D designs.

Replacement Considerations

For new designs, consider the MP7745 as an alternative. The MP7742 continues production only for existing customers. Verify pin compatibility with legacy parts like the MP7722 if upgrading within the same family.