MP4689DN-LF-P

Overview

The MP4689 is a synchronous step-down DC/DC converter featuring an integrated N-channel high-side MOSFET and a low-side MOSFET. It operates with a wide input voltage range from 4.5V to 28V, supporting output voltages adjustable down to 0.8V. The device delivers up to 3A of continuous output current with high efficiency across various load conditions. Integrated protection features include overcurrent protection, thermal shutdown, and undervoltage lockout. The controller utilizes fixed-frequency peak current mode control architecture for rapid transient response.

Feature Summary

• Integrated synchronous rectification with internal high-side and low-side power switches
• Fixed-frequency peak current mode control architecture for stable operation
• Comprehensive protection mechanisms including thermal shutdown and overcurrent limiting

Applications

• Point-of-load regulation for industrial equipment
• Power supply stages for consumer electronics
• Battery-powered systems requiring efficient voltage conversion

Procurement Notes

Verify the specific suffix codes against official Monolithic Power Systems documentation to ensure correct pinout and thermal pad configuration. Confirm that the LF designation indicates lead-free compliance as per RoHS standards. Cross-reference the package outline dimensions with the manufacturer's mechanical drawing to ensure compatibility with your PCB footprint and assembly process requirements.

Selection Notes

Select this component when a compact solution with integrated power switches is required for currents up to 3A. Ensure the input voltage range aligns with your system's power source, particularly noting the 28V maximum limit. Consider the thermal performance in your enclosure design, as the power dissipation depends on the input-output voltage differential and load current.

Part Context

This part belongs to the MP46xx family of synchronous buck converters designed for medium-current applications. It shares architectural similarities with other members like the MP4687 but offers specific current handling capabilities. The DN package type indicates a small form-factor solution suitable for space-constrained designs.

Replacement Considerations

Direct replacements may include the MP4687 or MP4686 depending on current requirements. Verify pin-to-pin compatibility and electrical parameter alignment before substitution. Consult official cross-reference lists for validated alternatives.