LM2673LD3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2673LD-3.3 is a fixed-output buck switching regulator IC from the SIMPLE SWITCHER® series, manufactured by National Semiconductor. It provides a fixed 3.3V output with a maximum current of 3A. The device operates within an input voltage range of 8V to 40V and features a switching frequency of 260kHz. It utilizes a 14-VSON (6x5) package with an exposed pad for thermal management. The component supports surface mount installation and functions as a positive, single-output regulator.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated synchronous-free buck topology for efficient step-down conversion
• Fixed 3.3V output configuration simplifies design implementation
• Built-in thermal shutdown and current limit protection mechanisms

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation in embedded systems
• Power supply stages for microprocessors and FPGAs
• Battery-powered equipment requiring stable 3.3V rails

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify component authenticity due to discontinued status and potential availability through secondary distributors like Rochester Electronics. Confirm RoHS compliance requirements as the specific part may not meet current environmental standards. Validate package integrity and pin alignment upon receipt. Ensure storage conditions prevent moisture damage to the exposed pad thermal structure.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output at 3A is required from an 8V-40V input source. The 260kHz frequency allows for compact external inductor and capacitor selection compared to lower-frequency alternatives. Consider the 14-VSON package for space-constrained PCB layouts requiring effective heat dissipation through the exposed pad.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2673 family of SIMPLE SWITCHER® regulators, designed for high-efficiency DC-DC conversion. It shares architectural similarities with other members like the LM2676 but differs in output voltage configuration. The LM2673LD-3.3 specifically targets applications needing a precise 3.3V rail without external feedback resistor adjustments.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Users should consult Texas Instruments or National Semiconductor official cross-reference guides for compatible replacements.