LM2673SD-5.0

Voltage Regulators - DC DC Switching Regulators Overview

The LM2673SD-5.0/NOPB is a SIMPLE SWITCHER® step-down voltage regulator from Texas Instruments, originally developed by National Semiconductor. It operates as a fixed-output buck converter with a nominal output of 5V and a maximum continuous output current of 3A. The device integrates a high-side N-channel MOSFET switch, enabling efficient power conversion without the need for an external catch diode. It functions within an input voltage range of 8V to 40V and utilizes a switching frequency of 260kHz. The component is housed in a 14-VSON package with an exposed thermal pad, designed for surface-mount installation.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a high-side N-channel MOSFET switch to eliminate the requirement for an external catch diode.
• Features adjustable soft-start capability to limit inrush current during startup.
• Includes internal current limiting and thermal shutdown protection for robust operation.

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems
• Battery-powered equipment requiring efficient step-down conversion
• Industrial control systems

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the specific part number includes the /NOPB suffix to ensure compliance with RoHS directives, as older variants may not meet current environmental standards. Confirm the manufacturer origin, noting that while National Semiconductor was the original developer, Texas Instruments now produces this series. Ensure the package type matches the 14-VSON specification with the required exposed pad for thermal management.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 5V output is required from an input rail between 8V and 40V. It is suitable for designs prioritizing simplicity and efficiency over adjustable output flexibility. Consider the 260kHz switching frequency for balancing component size and electromagnetic interference. Ensure the PCB layout supports the thermal requirements of the VSON package due to the integrated power switch.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the SIMPLE SWITCHER® family of regulators, which are characterized by their minimal external component count and ease of design implementation. The LM2673 series represents a generation of non-synchronous buck converters known for reliability in general-purpose power supply applications. The transition from National Semiconductor to Texas Instruments maintains the functional specifications while updating manufacturing processes.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2673T-5.0/NOPB (TO-220-7 package)

Voltage Regulators - DC DC Switching Regulators FAQ

Does the LM2673SD-5.0 require an external catch diode?

No, it integrates a high-side N-channel MOSFET switch, eliminating the need for an external catch diode.

What is the switching frequency of this regulator?

The device operates at a fixed switching frequency of 260kHz.