LM3445MMX

Overview

The LM3445MMX is a constant current LED driver controller manufactured by National Semiconductor, designed for high-efficiency AC/DC power supplies. It integrates a PFC controller and a flyback converter controller to drive LEDs with precise current regulation. The device operates in boundary conduction mode to minimize switching losses and reduce electromagnetic interference. It supports universal input voltage ranges and provides comprehensive protection features including over-voltage, over-current, and thermal shutdown. The MMX suffix indicates a TSSOP-16 package suitable for compact designs.

Feature Summary

• Integrated Power Factor Correction (PFC) and flyback controller for simplified design
• Boundary conduction mode operation for enhanced efficiency and reduced EMI
• Universal AC input voltage compatibility for global applicability
• Built-in protection mechanisms ensuring robust system reliability

Applications

• High-power LED lighting fixtures
• Commercial and industrial LED drivers
• General-purpose AC/DC power supplies for LED arrays

Procurement Notes

Verify the exact datasheet revision and manufacturer documentation before procurement. Confirm that the MMX package variant matches your PCB footprint requirements. Ensure compliance with relevant safety standards for LED driver applications. Cross-reference part numbers with authorized distributors to avoid counterfeit components.

Selection Notes

Select this component when designing AC-driven LED systems requiring integrated PFC and regulation. Consider the TSSOP-16 package constraints for thermal management and board space. Evaluate the operating temperature range against your specific application environment. Verify input voltage specifications match your target market requirements.

Part Context

National Semiconductor was acquired by Texas Instruments. The LM3445 series represents legacy products from National Semiconductor's portfolio. Designers should consult Texas Instruments documentation for updated support information. The component remains valid for new designs but may require long-term supply chain verification.

Replacement Considerations

Check Texas Instruments official substitution guides for compatible alternatives. Verify pin-to-pin compatibility if direct replacement is required. Ensure electrical parameters of substitutes meet original design specifications.