MP46885DN-LF

Overview

The MP46885DN-LF-Z is a monolithic high-voltage step-down DC-DC converter designed for driving white LEDs. It integrates a high-side power MOSFET and operates within an input voltage range of 4.5V to 80V. The device delivers a regulated output current of up to 500mA with a typical accuracy of ±5%. It supports PWM dimming control at frequencies up to 20kHz and utilizes a fixed switching frequency of 2MHz. The component is housed in an 8-SOICE package with an exposed pad for thermal management.

Feature Summary

• Hysteresis current mode control provides ultra-fast transient response without requiring external compensation components.
• Integrated high-side power MOSFET eliminates the need for external bootstrap diodes or drivers.
• Dedicated PWM dimming input enables precise brightness control for lighting applications.
• Built-in protection mechanisms include over-temperature shutdown, short-circuit protection, and optional output voltage limiting.

Applications

• Automotive exterior and interior LED lighting systems
• Industrial general-purpose LED illumination
• High-brightness white LED driver circuits

Procurement Notes

Verify the specific suffix (LF-Z) against the manufacturer's datasheet to confirm lead-free compliance and packaging type. Ensure the design accommodates the 8-SOICE package thermal requirements via the exposed pad. Confirm that the application voltage does not exceed the 80V maximum rating. Check for RoHS3 compliance status if required by regional regulations.

Selection Notes

Select this component when a wide input voltage range up to 80V is required for LED driving. It is suitable for designs prioritizing minimal external component count due to the integrated hysteresis control scheme. Consider the 2MHz switching frequency for smaller passive component sizes. Ensure the load current requirement aligns with the 500mA output capability.

Part Context

This part belongs to the MP4688 family of high-voltage LED drivers from Monolithic Power Systems. The series is characterized by its ability to operate directly from high-voltage sources common in automotive and industrial environments. The DN-LF designation indicates a specific pinout and lead-free manufacturing process within the SOIC-8 form factor.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing circuit layouts before considering alternative manufacturers.