LM2576-3.3BT

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576-3.3BT is a monolithic integrated circuit step-down (buck) switching regulator manufactured by Microchip Technology. It provides a fixed 3.3V output with a guaranteed maximum load current of 3A. The device operates from an input voltage range of 4V to 40V and utilizes a fixed-frequency internal oscillator at 52kHz. Designed for high efficiency, it requires only four external components. The unit is housed in a TO-220-5 package suitable for through-hole mounting.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Fixed 3.3V output voltage with ±4% tolerance over line and load conditions
• Integrated 52kHz fixed-frequency internal oscillator
• Built-in thermal shutdown and cycle-by-cycle current limiting protection

Voltage Regulators - DC DC Switching Regulators Applications

• Simple high-efficiency step-down (buck) regulators
• Efficient pre-regulators for linear regulators
• On-card switching regulators

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific manufacturer source, as the LM2576 series was originally developed by National Semiconductor and is now produced by multiple vendors including onsemi and Texas Instruments. Confirm that the Microchip Technology variant matches the required pinout and electrical specifications for your design. Check component status, as availability may vary across different production lines.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a stable 3.3V supply is required from a higher DC input voltage up to 40V. It is appropriate for designs needing up to 3A of continuous load current without complex feedback networks. Consider the TO-220-5 package for applications requiring robust thermal performance via heatsinking or board copper area.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2576 SIMPLE SWITCHER family of 3A step-down voltage regulators. The series includes adjustable versions and other fixed voltages such as 5V, 12V, and 15V. The LM2576-3.3BT specifically targets applications needing a regulated 3.3V rail, offering a high-efficiency alternative to traditional three-terminal linear regulators.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include LM2576T-3.3G from onsemi and LM2576T-ADJ/NOPB from Texas Instruments. Verify pin compatibility and thermal characteristics before substitution.