LM2574N-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2574N-3.3 is a step-down switching regulator manufactured by onsemi, designed for high-efficiency power conversion in through-hole applications. It operates with an input voltage range up to 40V and provides a fixed 3.3V output at a maximum current of 500mA. The device utilizes a buck topology with a typical switching frequency of 52kHz. It features internal frequency compensation and a fixed-frequency oscillator, eliminating the need for external timing components. The component supports an operating temperature range from -40°C to +125°C and is housed in an 8-pin PDIP package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a 52kHz fixed-frequency oscillator for simplified design without external timing components
• Includes internal frequency compensation to reduce the number of required external passive components
• Features built-in thermal shutdown and current limiting for enhanced operational reliability

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load DC/DC conversion modules
• Pre-regulators for linear post-regulator circuits
• Battery-powered systems requiring efficient voltage stepping

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'N' confirms the PDIP-8 through-hole package variant rather than surface-mount options. Confirm the '-3.3' designation ensures the fixed 3.3V output version is selected, distinct from adjustable or other voltage variants within the LM2574 family. Cross-reference datasheet revisions to ensure compatibility with existing bill of materials specifications.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust, through-hole solution is required for moderate current loads up to 500mA. It is suitable for designs prioritizing simplicity due to integrated compensation over higher efficiency synchronous alternatives. Ensure input voltage requirements do not exceed the 40V absolute maximum rating and that thermal management aligns with the specified junction temperature limits.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2574 series of monolithic integrated circuits, which are widely recognized as simple-to-use step-down switching regulators. The series offers a comprehensive set of functional blocks including an oscillator, reference voltage, error amplifier, and power switch, making it a standard choice for general-purpose power supply designs across various industrial and consumer electronics applications.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

• LM2574N-3.3/NOPB (Texas Instruments)
• LM2574-3.3BN (Microchip Technology)