LM2673S-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2673S-3.3/NOPB is a Texas Instruments SIMPLE SWITCHER® 3A step-down voltage regulator in a TO-263 package. It provides a fixed 3.3V output with a maximum input voltage of 40V and operates at a switching frequency of 260kHz. The device supports an output current of 3A, functions within a temperature range of -40°C to +125°C, and includes resistor-programmable peak current limiting.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated SIMPLE SWITCHER control architecture for simplified design
• Resistor-programmable peak current limit capability
• Fixed 3.3V output voltage option

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for digital logic supplies
• Input stage filtering for downstream linear regulators
• Battery-powered systems requiring efficient step-down conversion

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix /NOPB confirms lead-free and RoHS compliance. Confirm the S- variant indicates surface-mount TO-263 packaging. Ensure the -3.3 designation matches the required fixed output voltage. Cross-reference the manufacturer part number against official Texas Instruments documentation to validate authenticity and revision status before procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required with up to 3A load capacity. The 260kHz switching frequency allows for smaller external inductor and capacitor sizes compared to lower-frequency alternatives. Verify that the 40V maximum input voltage exceeds the system's supply rail. Consider thermal management requirements due to the power dissipation inherent in buck conversion at high currents.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2673 family of SIMPLE SWITCHER regulators. It shares architectural similarities with the LM2679 but offers lower current capability. The device integrates a power switch and control circuitry into a single monolithic IC, reducing the component count required for standard buck converter designs.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The LM2673SX-3.3/NOPB is a direct equivalent with identical electrical specifications. The LM2673T-3.3/NOPB serves as a through-hole alternative in a TO-220 package. Verify pinout compatibility and thermal performance when substituting between surface-mount and through-hole variants.