LM2575BU

Voltage Regulators - DC DC Switching Regulators Overview

The LM2575BU is a monolithic integrated circuit providing active functions for a step-down (buck) switching regulator. It drives a 1A load with excellent line and load regulation. The device operates from an input voltage up to 40V and includes a fixed-frequency 52kHz oscillator. It offers fixed output voltages of 3.3V, 5V, 12V, and 15V, plus an adjustable version. Key electrical parameters include a maximum switching frequency of 52kHz, a minimum input voltage of 4V, and a maximum input voltage of 40V. The output current capability is rated at 1A.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates all active functions required for a buck switching regulator in a single IC
• Includes built-in fixed-frequency oscillator and internal frequency compensation
• Features thermal shutdown and cycle-by-cycle current limiting for fault protection
• Supports external shutdown control with low standby current consumption

Voltage Regulators - DC DC Switching Regulators Applications

• Efficient replacement for linear regulators in systems requiring lower heat dissipation
• Pre-regulator stages for downstream switching regulators
• Battery-powered systems requiring high efficiency step-down conversion
• General-purpose DC-DC power supplies operating within the 4V to 40V input range

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific output voltage suffix (e.g., 3.3, 5.0, ADJ) as the base part number covers multiple variants. Confirm the manufacturer source, as Micrel and Microchip are listed; ensure the datasheet matches the intended supply chain requirements. Check package availability against the TO-263-5 specification if surface mount installation is required for the design.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a simple, cost-effective buck converter solution is needed for loads up to 1A. It is suitable for designs prioritizing ease of implementation over ultra-high efficiency or high-frequency operation. Ensure the application input voltage remains within the 4V to 40V range. Consider the thermal performance of the TO-263-5 package under full load conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2575 series of SIMPLE SWITCHER regulators. The series is designed to simplify power supply design by minimizing external component count. It serves as a direct drop-in replacement for many three-terminal linear regulators, offering significant improvements in thermal management and efficiency for standard voltage regulation tasks.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.