LM2678LD-5.0

Voltage Regulators - DC DC Switching Regulators Overview

The LM2678LD-5.0 is a monolithic integrated circuit from the SIMPLE SWITCHER series, functioning as a high-efficiency 5A step-down voltage regulator. It operates with an input voltage range of 8V to 40V and provides a fixed 5V output. The device utilizes low on-resistance DMOS power switches to achieve efficiencies exceeding 90%. Key electrical parameters include a switching frequency of 260 kHz, a maximum output current of 5A, and a quiescent current of 4.2 mA. It supports operation in temperatures ranging from -40°C to +125°C and features thermal shutdown protection.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates all active functions for a buck converter topology within a single IC.
• Utilizes low on-resistance DMOS power switches for high efficiency.
• Includes built-in thermal shutdown protection for system reliability.

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems
• Battery-powered equipment requiring efficient step-down conversion
• General-purpose DC/DC power supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer origin, as National Semiconductor assets were acquired by Texas Instruments. Confirm the package type matches the specific suffix (e.g., LLP-14) and ensure the part number corresponds to the fixed 5.0V output variant. Check for RoHS compliance status and verify that the datasheet revision aligns with the required specifications for your design.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 5V output is required from an 8V to 40V input source. Ensure the application demands up to 5A continuous load current. Verify that the thermal management strategy accommodates the power dissipation at the expected operating conditions. Consider the LLP-14 package constraints for PCB layout and heat sinking requirements compared to other pin-out options in the series.

Voltage Regulators - DC DC Switching Regulators Part Context

The LM2678 series comprises SIMPLE SWITCHER regulators available in fixed voltages (3.3V, 5V, 12V) and adjustable versions. The LD suffix typically denotes the LLP-14 package variant. This family is designed to simplify power supply design by integrating the controller, driver, and power switch, reducing the external component count compared to discrete solutions.

Voltage Regulators - DC DC Switching Regulators FAQ

What is the fixed output voltage of the LM2678LD-5.0?

The LM2678LD-5.0 provides a fixed regulated output voltage of 5.0V.

Does the LM2678LD-5.0 support adjustable output voltages?

No, the LM2678LD-5.0 is a fixed-output regulator. Adjustable versions are designated with different suffixes, such as T-ADJ.