LM2673SD-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2673SD-3.3/NOPB is a SIMPLE SWITCHER® step-down voltage regulator from Texas Instruments, designed for high-efficiency power conversion. It integrates a 0.49A internal switch and operates with an input voltage range of 8V to 40V. The device provides a fixed 3.3V output capable of delivering up to 3A load current. Key electrical parameters include a typical quiescent current of 4.2mA and a switching frequency of 260kHz. It functions within an operating temperature range of -40°C to +125°C and utilizes a compact VSON (NHM) package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a high-voltage 0.49A power switch for efficient buck conversion
• Features adjustable current limit protection for enhanced system reliability
• Operates at a fixed 260kHz switching frequency to minimize external component size
• Includes thermal shutdown and cycle-by-cycle current limiting

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 with wide input voltage ranges
• Telecommunications infrastructure power supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix (e.g., NOPB) to confirm lead-free status and RoHS compliance as per the manufacturer's datasheet. Confirm package type accuracy, as variations exist between TO-220 and VSON formats within the LM2673 family. Ensure the fixed 3.3V output variant matches the design requirement, distinguishing it from adjustable versions. Cross-reference the ordering part number with official Texas Instruments documentation to avoid substitution errors.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required from an 8V to 40V input source. The integrated 0.49A switch supports loads up to 3A, suitable for moderate power applications. Consider the VSON package for space-constrained designs compared to larger through-hole options. Evaluate the 260kHz frequency against EMI requirements and inductor size constraints. Verify thermal performance under maximum load conditions given the -40°C to +125°C operating range.

Voltage Regulators - DC DC Switching Regulators Part Context

The LM2673 series belongs to Texas Instruments' SIMPLE SWITCHER family, known for simplifying power supply design by integrating control circuitry and power switches. This specific model represents a fixed-output variant optimized for efficiency and ease of implementation. It serves as a robust solution for replacing linear regulators in applications where heat dissipation and efficiency are critical concerns.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The LM2673SD-3.3/NOPB is listed as obsolete. Official substitutes may include newer generations of SIMPLE SWITCHER regulators or compatible parts from other manufacturers with matching 3.3V output, 3A current capability, and similar input voltage ranges. Verify pin compatibility and thermal characteristics before substitution.