LM2576-12BU TR

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576-12BU TR is a monolithic integrated circuit from the LM2576 series, functioning as a step-down (buck) switching regulator. It provides a fixed 12V output with a maximum load current of 3A. The device accepts an input voltage range from 4V to 40V and operates at a fixed internal oscillator frequency of 52kHz. It features adjustable output versions ranging from 1.23V to 37V in other variants. The component includes built-in frequency compensation, thermal shutdown, and current limit protection. It is housed in a TO-263 package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a fixed-frequency oscillator and frequency compensation to minimize external component count
• Includes comprehensive protection mechanisms such as thermal shutdown and current limiting
• Offers TTL-compatible shutdown capability for low-power standby modes

Voltage Regulators - DC DC Switching Regulators Applications

• Simple high-efficiency step-down DC-to-DC converters
• Efficient pre-regulators for linear regulators
• On-card switching regulators
• Positive-to-negative converter topologies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the specific suffix 'TR' corresponds to tape-and-reel packaging if reel handling is required for assembly. Confirm RoHS compliance status as older LM2576 variants may not meet current environmental standards. Check for obsolescence notices or lifecycle changes from Microchip Technology before finalizing procurement plans.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this part for applications requiring a fixed 12V output from a higher DC bus voltage up to 40V. The 52kHz switching frequency necessitates larger passive components compared to modern high-frequency regulators. Ensure the design accounts for the thermal dissipation requirements associated with the TO-263 package under full 3A load conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the LM2576 family of 3A switch-mode voltage regulators originally developed by National Semiconductor and now manufactured by Microchip Technology. The series is widely recognized for simplifying buck converter designs through minimal external component requirements. The LM2576-12 variant specifically targets 12V output applications within this established architecture.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

• LM2576T-ADJ/NOPB
• LM2575T-ADJG

Voltage Regulators - DC DC Switching Regulators FAQ

What is the fixed output voltage of the LM2576-12?

The LM2576-12 provides a fixed output voltage of 12V.

Does the LM2576-12 support external shutdown control?

Yes, it features a TTL-compatible shutdown pin that allows for low-power standby mode activation.