LM2574-3.3BN

Voltage Regulators - DC DC Switching Regulators Overview

The LM2574-3.3BN is a fixed-output buck switching regulator manufactured by Microchip Technology, designed for step-down DC-DC conversion applications. It provides a stable 3.3V output with a maximum continuous current of 500mA. The device operates from an input voltage range up to 40V and utilizes a fixed switching frequency of 52kHz. It features internal frequency compensation and protection mechanisms including thermal shutdown and cycle-by-cycle current limiting. The component is housed in an 8-PDIP package suitable for through-hole mounting.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated buck topology simplifies design by requiring minimal external components
• Internal oscillator ensures stable 52kHz switching frequency without external timing parts
• Built-in thermal shutdown and current limiting protect against fault conditions

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for digital logic circuits
• Pre-regulation for linear post-regulators
• Battery-powered systems requiring efficient step-down conversion

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'BN' corresponds to the PDIP-8 package and 3.3V fixed output configuration as listed in official Microchip documentation. Confirm RoHS compliance status, as datasheets may indicate non-compliance for certain variants. Check manufacturer lifecycle status, as this part number may be discontinued or subject to last-time buy restrictions. Ensure sourcing channels provide valid traceability for industrial or commercial use cases.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a simple, low-component-count buck converter is required for moderate current loads up to 500mA. It is suitable for designs where a fixed 3.3V output is needed from higher voltage rails up to 40V. Consider the PDIP-8 package constraints for PCB layout and thermal management. Evaluate if the 52kHz switching frequency aligns with EMI requirements and inductor size preferences compared to higher-frequency alternatives.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2574 family of SIMPLE SWITCHER regulators, known for ease of use and robust performance in basic power supply designs. The LM2574 series typically includes adjustable and fixed voltage versions across various packages. This specific model represents the fixed 3.3V variant in a through-hole DIP package, distinguishing it from surface-mount or high-voltage HV variants within the same product line.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2574-3.3YN is documented as a direct substitute offering identical functionality but in a different package configuration.