Texas Instruments

LM2679T-5.0

LM2679T-5.0 Description

The LM2679T-5.0 from Texas Instruments is a fixed 5V, 5A step-down (buck) switching voltage regulator, part of the SIMPLE SWITCHER® series. Designed for high-efficiency power conversion, it operates with an input voltage range of 8V to 40V, making it suitable for industrial, automotive, and telecom applications. The regulator integrates a 260kHz switching frequency, reducing external component size and cost while maintaining stable performance. Housed in a TO-220-7 package, it supports through-hole mounting for robust thermal management. Although marked as "Not For New Designs", it remains a reliable choice for legacy systems requiring high-current, low-noise power regulation.

LM2679T-5.0 Features

• Fixed 5V Output: Eliminates the need for external feedback resistors, simplifying design.
• High Efficiency (Up to 95%): Minimizes power loss with internal N-channel MOSFET and optimized control.
• Wide Input Range (8V–40V): Compatible with 12V/24V automotive and industrial power rails.
• 5A Continuous Output Current: Supports high-power loads without external pass transistors.
• 260kHz Switching Frequency: Balances efficiency and component size, reducing EMI concerns.
• Non-Synchronous Rectification: Cost-effective for applications not requiring ultra-high efficiency.
• TO-220-7 Package: Robust thermal performance with through-hole mounting.
• MSL1 (Unlimited Shelf Life): No moisture sensitivity constraints for storage or assembly.

LM2679T-5.0 Applications

• Industrial Power Supplies: For PLCs, motor drives, and control systems requiring stable 5V rails.
• Automotive Electronics: Powers infotainment, sensors, and ECUs in 12V/24V vehicles.
• Telecom Infrastructure: Base stations and networking equipment needing high-current regulation.
• Legacy Systems: Cost-effective upgrades for older designs using linear regulators.
• Distributed Power Architectures: Intermediate bus converters in multi-rail systems.

Conclusion of LM2679T-5.0

The LM2679T-5.0 excels in delivering high-efficiency, high-current power conversion with minimal external components. Its wide input range, fixed output, and robust packaging make it ideal for demanding environments like automotive and industrial systems. While newer alternatives exist, its proven reliability and simplicity ensure continued relevance in legacy and cost-sensitive designs. For engineers seeking a no-frills, high-performance buck regulator, the LM2679T-5.0 remains a compelling choice.