LM2574MX-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2574MX-3.3 is a Texas Instruments SIMPLE SWITCHER® step-down switching voltage regulator in the LM2574x series. It provides a fixed 3.3V output with a maximum current capability of 500mA. The device operates from an input voltage range of 4V to 40V and utilizes a fixed 52kHz switching frequency. Packaged in a surface-mount SOIC-14 (Wide) format, it supports Buck topology and functions within an operating temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated monolithic power switch rated for 0.5A continuous load current
• Fixed internal oscillator eliminates external timing component requirements
• Built-in thermal shutdown circuitry protects against overheating conditions
• Standardized pinout allows direct replacement for older adjustable regulators

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems
• Input voltage step-down for battery-powered devices
• Pre-regulation stages for linear post-regulators
• General-purpose DC/DC conversion in industrial equipment

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix indicates the 3.3V fixed output variant. Confirm the package designation matches the required SOIC-14 footprint. Ensure the ordering code includes NOPB if lead-free compliance is mandatory for the assembly process. Cross-reference the manufacturer part number directly with official documentation to avoid confusion with similar high-voltage or adjustable variants.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V rail is required from a 4V to 40V source. The 500mA output current suits moderate load applications. The wide input voltage range accommodates various supply sources. Consider the 52kHz frequency for standard passive component sizing. Verify that the SOIC-14 package fits the available board space constraints.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM2574x family of SIMPLE SWITCHER regulators. The 'MX' suffix denotes the surface-mount SOIC-14 package. The '-3.3' specifies the fixed 3.3V output voltage option. This family is designed for ease of use with minimal external components compared to adjustable counterparts.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2574-3.3/NOPB: Direct equivalent in PDIP-8 through-hole package. LM2574HVMX-3.3/NOPB: High-voltage variant supporting up to 60V input. LM2574-3.3BN: Alternative version by Microchip Technology.