LM2574N-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2574N-3.3 is a monolithic integrated circuit step-down switching regulator from the Texas Instruments SIMPLE SWITCHER family, housed in an 8-pin MDIP package. It provides a fixed 3.3 V output with a guaranteed maximum load current of 0.5 A. The device operates within an input voltage range of 4 V to 40 V and features a fixed internal oscillator frequency of 52 kHz. Designed for high efficiency, it supports operation across an extended temperature range from -40 °C to +125 °C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated 52 kHz fixed-frequency internal oscillator simplifies external component selection
• Built-in thermal shutdown and current limit protection ensures operational reliability
• TTL shutdown capability enables low power standby mode control

Voltage Regulators - DC DC Switching Regulators Applications

• Simple and high-efficiency step-down (buck) regulators
• Efficient pre-regulator for linear regulators
• Positive to negative converters (Buck-Boost)
• Power supply for battery chargers

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the specific part number suffix matches the required package type and lead-free status. Confirm the manufacturer source aligns with original equipment specifications. Ensure the ordering information corresponds to the exact voltage variant and pin configuration required for the target application design.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3 V output is required with up to 0.5 A load capacity. It is suitable for designs prioritizing minimal external component count and standard inductor availability. Consider the 52 kHz switching frequency for trade-offs between component size and electromagnetic interference.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM2574 series of switching voltage regulators manufactured by Texas Instruments. It is part of the SIMPLE SWITCHER product line, designed to minimize external components for easy design implementation. The series includes various fixed voltage options and adjustable versions for diverse power management needs.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Compatible substitutes include LM2574N-5.0/NOPB and LM2574N-12/NOPB for different fixed voltages. The LM2574HV series offers higher input voltage capabilities. Verify pin compatibility and thermal performance before substitution.