LM2574N-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2574N-3.3/NOPB is a step-down switching voltage regulator from the SIMPLE SWITCHER family, manufactured by Texas Instruments. It operates with an input voltage range of 4 V to 40 V and provides a fixed output of 3.3 V at up to 500 mA. The device utilizes a buck topology with a typical switching frequency of 52 kHz. It is housed in an 8-pin MDIP package designed for through-hole mounting. The component supports an operating temperature range from -40 °C to +125 °C and includes internal features such as a 150 mA standby current regulator and thermal shutdown protection.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated monolithic power switch capable of delivering up to 500 mA load current
• Fixed 3.3 V output voltage option eliminates external resistor networks
• Internal oscillator sets switching frequency at 52 kHz for compact passive design
• Thermal shutdown circuitry protects against excessive junction temperatures

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for digital logic circuits
• Pre-regulation stages for linear post-regulators
• Battery-powered systems requiring efficient voltage stepping

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'N' confirms the through-hole MDIP package variant rather than surface-mount options. Confirm the '-3.3' designation matches the required fixed output voltage. Ensure the '/NOPB' suffix indicates lead-free and RoHS compliance status as specified in the official datasheet before finalizing procurement specifications.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3 V output is required from an input source between 4 V and 40 V. The through-hole MDIP package is suitable for prototyping or applications where manual assembly is preferred. Consider the 52 kHz switching frequency when designing external inductor and capacitor values to ensure stable operation within the specified thermal limits.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2574 series of SIMPLE SWITCHER regulators, which are widely used for efficient DC-DC conversion. The 'N' suffix distinguishes it from the surface-mount 'M' or 'MX' variants, indicating a dual-in-line package construction. The series is known for simplifying power supply design by integrating the control circuitry and power switch into a single IC.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2574N-3.3/NOPB