LM2575-3.3BT

Voltage Regulators - DC DC Switching Regulators Overview

The LM2575-3.3BT is a monolithic integrated circuit providing all active functions for a step-down (buck) switching regulator. It drives a 1A load with excellent line and load regulation. The device features a fixed 3.3V output, operating within an input voltage range of 4V to 40V. It utilizes a 52kHz internal oscillator frequency. The component supports through-hole installation in a TO-220-5 package. Operating temperature ranges from -40°C to +125°C. Efficiency typically reaches 77%. Output accuracy is ±4%.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated buck switching regulator topology for efficient DC-DC conversion
• Built-in fixed-frequency oscillator eliminating external timing components
• Internal current limit and thermal shutdown protection mechanisms
• High efficiency performance reducing heat dissipation requirements

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load DC power supply regulation
• Pre-regulator stages for switching regulators
• Efficient linear regulator replacements
• Battery-powered systems requiring step-down conversion

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific manufacturer source, as Microchip Technology acquired Micrel, which originally produced this series. Confirm the exact suffix designation matches the required package and temperature grade. Check availability status carefully, as many variants in this legacy series are marked obsolete or discontinued by various distributors. Ensure the procurement channel provides genuine components with traceable documentation.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust, high-current buck converter is needed with minimal external parts. The fixed 3.3V output simplifies design for standard logic levels. Consider the TO-220 package for applications requiring direct board mounting and potential heatsinking. Evaluate the 52kHz switching frequency against EMI constraints. Verify that the 1A output current meets the maximum load requirement without derating issues.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2575 series of switching regulators, a widely used family for simple, efficient power conversion. The series includes standard voltage and high-voltage input variants. The LM2575-3.3BT specifically denotes the 3.3V fixed output version in a TO-220 package. It serves as a direct replacement for many three-terminal linear regulators where size and efficiency are critical concerns.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2575T-5.0/NOPB is a documented substitute within the same series offering similar functionality.