LM2574YN

Voltage Regulators - DC DC Switching Regulators Overview

The LM2574YN is a monolithic integrated circuit step-down switching regulator manufactured by Microchip Technology. It operates as a buck converter with a fixed output voltage of 3.3V and a maximum output current capability of 500mA. The device utilizes a 52kHz internal switching frequency to regulate DC-DC conversion efficiently. It supports an input voltage range up to 40V and functions within a junction temperature range of -40°C to 125°C. The component is housed in an 8-PDIP package designed for through-hole mounting.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a fixed-frequency oscillator and control circuitry for simplified buck converter design
• Includes internal frequency compensation and thermal shutdown protection mechanisms
• Features a high-voltage power switch capable of handling substantial input voltage differentials

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for distributed power architectures
• Pre-regulator stages for linear post-regulators
• Efficient DC-DC conversion for battery-powered systems

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix against official Microchip documentation, as ordering codes may indicate variations in packaging or environmental compliance. Confirm that the procurement channel provides valid traceability for this discontinued part number. Ensure compatibility with existing PCB footprints before finalizing acquisition.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required from higher voltage sources without external feedback adjustments. Consider the 500mA current limit and 52kHz switching frequency constraints during thermal management planning. Evaluate the PDIP package suitability for the target mechanical assembly requirements.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2574 series of SIMPLE SWITCHER regulators, which are widely recognized for their ease of use in non-synchronous buck applications. The 'YN' suffix typically denotes the specific output voltage variant and package configuration within the broader family of adjustable and fixed-output regulators produced by Microchip.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2574-3.3BN is documented as a direct substitute for the LM2574YN.