LM2574M-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2574M-3.3 is a SIMPLE SWITCHER step-down switching regulator manufactured by Texas Instruments, designed for high-efficiency DC/DC conversion in surface-mount applications. It integrates a 0.5A power switch and operates from an input voltage range of 4V to 40V. The device provides a fixed 3.3V output with a typical switching frequency of 52kHz. Packaged in a 14-pin SOIC (Wide) format, it supports operation across an extended temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a 0.5A internal power switch for compact design
• Fixed 3.3V output option eliminates external feedback resistors
• Operates at a standard 52kHz switching frequency
• Includes thermal shutdown and current limit protection

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems
• Battery-powered equipment requiring efficient step-down conversion
• General-purpose DC/DC converter modules

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm package type and temperature rating. Ensure the component matches the required pinout for the target PCB footprint. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components. Confirm RoHS compliance status if restricted substances are a project constraint.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required without external resistor networks. It is suitable for designs prioritizing board space savings through integrated switching solutions. Consider the 40V maximum input rating for compatibility with common bus voltages. Evaluate the 52kHz frequency trade-off between component size and electromagnetic interference.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2574 family of SIMPLE SWITCHER regulators, which are widely used for non-isolated buck conversions. The 'M' suffix indicates a surface-mount SOIC package variant, distinguishing it from through-hole PDIP versions. It serves as a direct replacement for older National Semiconductor equivalents within the same functional class.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2574M-3.3/NOPB is a verified equivalent offering identical electrical specifications with lead-free packaging.