The LM2678T-5.0 is a high-efficiency, step-down voltage regulator manufactured by Texas Instruments. This regulator is part of the LM2678 series, which is renowned for its simple and efficient solutions for converting higher DC voltages to lower regulated voltages. The LM2678T-5.0 specifically provides a fixed output voltage of 5V, which is a common requirement in many electronic applications.

Key Features

• Output Voltage: Fixed 5V output with high precision, making it ideal for powering logic circuits and microcontrollers.
• Output Current: Capable of delivering up to 5A of continuous output current to the load.
• Efficiency: Integrated switch and a simple external circuit allow for efficiencies up to 92%, reducing heat dissipation and saving energy.
• Adjustable Switching Frequency: Operates at a switching frequency of 260kHz, which can be increased with an external resistor.
• Voltage Range: Wide input voltage range from 8V to 40V, accommodating a variety of source voltages.
• Protection Features: Includes built-in thermal shutdown, current limit protection, and an optional output overvoltage protection circuit.
• Package: Available in a TO-220 package, which is suitable for through-hole mounting and offers good thermal performance.

Applications

The LM2678T-5.0 is versatile and can be used in a wide range of applications, including:

• Simple high-efficiency step-down (buck) regulators
• Efficient pre-regulators for linear regulators
• On-card switching regulators for elimination of noise and distribution problems associated with single-point regulation

Design Support

Texas Instruments provides comprehensive design support for the LM2678T-5.0, including datasheets, application notes, and a variety of design tools. Engineers can access these resources on the Texas Instruments website to facilitate the design process and ensure the best performance from their power supply circuits.