LM2574-3.3BWM

Voltage Regulators - DC DC Switching Regulators Overview

The LM2574-3.3BWM is a step-down switching voltage regulator manufactured by Microchip Technology, formerly Micrel Inc. It provides a fixed 3.3V output with a maximum current of 500mA. The device operates from an input voltage range up to 40V and features a standard switching frequency of 52kHz. It utilizes a buck topology for efficient power conversion. The component is housed in an 8-SOIC (0.154", 3.90mm Width) surface-mount package. It includes internal cycle-by-cycle current limiting and thermal shutdown protection.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated high-current switch capable of delivering up to 500mA load current
• Fixed 3.3V output option eliminates external feedback resistor networks
• Internal oscillator sets switching frequency at 52kHz for simplified compensation
• Built-in thermal shutdown and cycle-by-cycle current limit for fault protection

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for digital logic circuits
• Input stage filtering for battery-powered systems
• Pre-regulation for linear post-regulators
• General-purpose DC-DC conversion in embedded systems

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer origin carefully as the part was originally developed by National Semiconductor and later acquired by Microchip. Confirm the suffix 'BWM' corresponds to the specific SOIC-8 tape-and-reel packaging variant. Check RoHS compliance status as older revisions may not meet current environmental standards. Ensure the datasheet version matches the production lot for accurate electrical parameter validation.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required with moderate current demands up to 500mA. The 52kHz switching frequency allows for smaller passive components compared to lower-frequency regulators but requires attention to PCB layout for noise reduction. Consider the 40V maximum input rating for compatibility with common bus voltages. Evaluate thermal performance under full load conditions given the surface-mount package constraints.

Voltage Regulators - DC DC Switching Regulators Part Context

This regulator belongs to the LM2574 family of SIMPLE SWITCHER power converters. The family offers various fixed output voltages and adjustable versions. The 'BWM' suffix indicates the wide-body SOIC package configuration. This series is designed for simplicity, requiring minimal external components to achieve stable operation across a wide input voltage range.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct pin-compatible substitutes include the LM2574-3.3ADJ or other variants within the same LM2574 family with matching output voltage. Verify that alternative packages maintain the same thermal resistance characteristics. Cross-reference with LM2574HV series if higher input voltage tolerance is needed, noting potential differences in switching frequency.