LM2576-3.3BU TR

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576-3.3BU TR is a monolithic integrated circuit step-down (buck) switching regulator manufactured by Microchip Technology. It provides all active functions for a DC-DC converter with a fixed 3.3 V output voltage and a maximum output current of 3 A. The device operates with an input voltage range from 4 V to 40 V and features a fixed switching frequency of 52 kHz. It utilizes a TO-263-5 surface-mount package. The component is currently classified as obsolete and no longer in production.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Monolithic buck switching regulator design
• Fixed 3.3 V output configuration
• Integrated internal oscillator and compensation

Voltage Regulators - DC DC Switching Regulators Applications

• Step-down DC-DC power conversion
• Efficient replacement for linear regulators
• General purpose voltage regulation

Voltage Regulators - DC DC Switching Regulators Procurement Notes

This component is officially listed as obsolete by the manufacturer. Direct procurement from Microchip Technology is not possible. Verification of availability should focus on authorized distributors holding remaining stock or approved substitute part numbers. Ensure any sourced units are genuine and match the original specifications before integration into designs.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Designers requiring this specific fixed 3.3 V output must consider that the LM2576-3.3BU TR is discontinued. Selection strategies should prioritize direct substitutes such as the LM2576-3.3WU-TR or equivalent modern buck converters from other manufacturers. Evaluate thermal performance and pin compatibility when transitioning to alternative components to maintain system integrity.

Voltage Regulators - DC DC Switching Regulators Part Context

The LM2576 series represents a family of high-efficiency switching regulators designed to replace traditional three-terminal linear regulators. This series reduces heat dissipation requirements and allows for smaller form factors in power supply designs. The LM2576-3.3BU TR specifically denotes the 3.3 V fixed output variant in a tape-and-reel surface-mount package, historically used in various industrial and consumer electronics applications.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include the LM2576-3.3WU-TR. Verify pinout compatibility and electrical parameters against the original datasheet before implementation.