MP3389EF-LF-P

Overview

The MP3389EF-LF-P is a high-voltage boost WLED controller designed for driving up to 12 LED strings in large LCD panel backlight applications. It operates with an input voltage range of 5 V to 28 V and utilizes an external MOSFET to regulate output. The device features a fixed-frequency current control architecture with a nominal switching frequency of 590 kHz, adjustable via an external resistor. Each channel provides a maximum output current of 60 mA with a string-to-string matching accuracy of 2.5%. It supports PWM dimming and includes comprehensive protection mechanisms such as open LED detection, overvoltage protection, and thermal shutdown.

Feature Summary

• Integrates twelve internal current sources to ensure precise current balancing across multiple LED strings
• Supports PWM dimming functionality through external input signals or internally generated frequencies
• Incorporates low average feedback voltage design to minimize power dissipation and enhance overall efficiency
• Provides robust fault protection including open LED detection, short circuit protection, and overtemperature shutdown

Applications

• Backlight drivers for large LCD panels
• White LED array illumination systems
• High-channel-count LED lighting controllers

Procurement Notes

Verify the specific suffix designation when sourcing, as package variations exist within the MP3389 family. Confirm that the required operating temperature range aligns with the EF variant specifications. Ensure compatibility with the intended external MOSFET selection for the boost topology. Check for updated lifecycle status as components may transition to recommended new designs.

Selection Notes

Select this component for applications requiring independent regulation of numerous LED strings with tight current matching requirements. The fixed-frequency operation simplifies electromagnetic interference filtering compared to variable frequency alternatives. Consider the TSSOP-28 package constraints for thermal management in dense PCB layouts. Validate that the input voltage range covers the minimum system supply under all load conditions.

Part Context

This part belongs to the MP3389 series of monolithic power systems designed specifically for white LED driver applications. The series focuses on providing balanced current distribution for multi-string configurations commonly found in display technologies. The EF suffix typically denotes a specific temperature grade and packaging option within the broader product line.

Replacement Considerations

Public documentation indicates the MP3394S as a recommended alternative for new designs. Verify pinout compatibility and electrical parameter alignment before substitution. Assess whether the reduced channel count of potential replacements meets the application's lighting requirements.