MP4688DN-LF-Z

Overview

The MP4688DN-LF-Z is a high-voltage step-down switching regulator designed for driving white LEDs. It features an integrated 3.2A typical current limit upper power MOSFET and operates within a wide input voltage range of 4.5V to 80V. The device utilizes hysteresis current mode control to achieve ultra-fast response and supports dimming frequencies up to 20kHz. With a switch frequency reaching 2MHz, it allows for the use of small external components. The IC provides LED current accuracy of typically ±5% and includes protection features such as over-temperature shutdown and short-circuit protection.

Feature Summary

• Integrates a high-side power MOSFET with a 3.2A typical current limit for compact design
• Employs hysteresis current mode control for fast transient response without compensation requirements
• Supports PWM dimming control inputs for precise brightness adjustment
• Includes built-in over-temperature shutdown and short-circuit protection for reliable operation

Applications

• Automotive lighting systems
• Industrial lighting applications
• General illumination solutions

Procurement Notes

Verify the specific suffix DN-LF-Z against official Monolithic Power Systems documentation to confirm package type and lead-free status. Ensure compatibility with required thermal management for the SOIC-EP-8 package. Cross-reference ordering information directly with authorized distributors or the manufacturer to validate current availability and correct part identification before procurement.

Selection Notes

Select this component for applications requiring a wide input voltage range up to 80V and high efficiency in LED driving. The integrated MOSFET reduces external component count compared to discrete solutions. Consider the 2MHz switching frequency for minimizing passive component size. Verify that the 170µA quiescent current meets battery-powered application requirements. Ensure the SOIC-EP-8 package fits the PCB layout constraints.

Part Context

This device belongs to the MP4688 series from Monolithic Power Systems, specialized for high-voltage LED driver applications. It is part of the broader PMIC portfolio focusing on efficient power conversion. The series is designed to meet the demands of automotive and industrial environments where reliability and wide operating temperature ranges are critical. It complements other MPS buck converters by offering specific features tailored for constant current LED loads.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Consult official MPS documentation for potential cross-references or updated series replacements.