LM2575T-3.3/LF03

Voltage Regulators - DC DC Switching Regulators Overview

The LM2575T-3.3/LF03 is a SIMPLE SWITCHER power module from Texas Instruments, functioning as a step-down DC-DC converter. It integrates a fixed output voltage of 3.3V and supports an input voltage range from 4V to 40V. The device delivers a maximum output current of 1A with a typical efficiency of 77%. Operating at a switching frequency of 52kHz, it utilizes a TO-220-5 through-hole package. The component operates within a temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates control circuitry, oscillator, reference, error amplifier, and power switch into a single monolithic IC.
• Provides a fixed 3.3V output option to eliminate external feedback resistor networks.
• Includes internal frequency compensation for stable operation without additional complex components.
• Features thermal shutdown protection to safeguard the device during overload conditions.

Voltage Regulators - DC DC Switching Regulators Applications

• Distributed power supply systems requiring efficient voltage regulation
• Pre-regulators for linear post-regulator modules
• Battery-powered applications utilizing high-efficiency step-down conversion

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix LF03 against the manufacturer's official datasheet to confirm lead-free compliance and RoHS status. Confirm that the TO-220-5 package dimensions match your PCB footprint requirements. Ensure the fixed 3.3V output aligns with system needs, as adjustable variants exist within the same family.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this part when a fixed 3.3V output is required with a 1A load capacity. It is suitable for designs prioritizing simplicity over adjustable output flexibility. Consider the 52kHz switching frequency for inductor sizing and EMI management. Verify input voltage stability does not exceed the 40V maximum rating under all operating conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the LM2575 series of SIMPLE SWITCHER regulators. It serves as a drop-in replacement for older National Semiconductor versions. The device simplifies design by integrating the power switch and control logic, reducing the bill of materials compared to discrete solutions.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2575T-3.3/NOPB is a direct equivalent offering identical electrical performance and pinout compatibility within the same package configuration.