LM2575T-12/LF03

Voltage Regulators - DC DC Switching Regulators Overview

The LM2575T-12/LF03 is a monolithic integrated circuit step-down switching regulator from the LM2575 series, manufactured by National Semiconductor. It provides a fixed 12V output with a maximum load current of 1A. The device operates with an input voltage range of 4V to 40V and features a fixed internal oscillator frequency of 52kHz. It utilizes a TO-220-5 through-hole package for thermal management and robust mounting. The regulator ensures high efficiency and includes built-in protections such as current limiting and thermal shutdown.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Fixed 12V output voltage configuration
• Integrated 52kHz fixed-frequency oscillator
• Built-in thermal shutdown and current limit protection

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load DC/DC conversion modules
• Pre-regulator stages for linear regulators
• General-purpose step-down power supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer origin carefully, as the LM2575 family was originally developed by National Semiconductor before its acquisition by Texas Instruments. Ensure the LF03 suffix corresponds to the specific lead-free or packaging variant required for your assembly process. Cross-reference datasheets between National Semiconductor and Texas Instruments documentation to confirm pinout compatibility and electrical specifications remain consistent across the transition.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a stable 12V rail is required from a higher input voltage source up to 40V. The TO-220-5 package is suitable for applications requiring through-hole mounting and adequate heat dissipation for 1A loads without excessive heatsinking. Consider the 52kHz switching frequency when selecting external inductors and capacitors to balance size and ripple performance against electromagnetic interference requirements.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2575 Simple Switcher family, designed to replace traditional three-terminal linear regulators. The series offers significant improvements in efficiency and thermal performance. The LM2575T-12 variant specifically provides a fixed 12V output, simplifying design by eliminating the need for external feedback resistors used in adjustable versions.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Texas Instruments LM2575T-12/NOPB serves as a direct functional replacement following the National Semiconductor acquisition. Verify that the NOPB suffix indicates lead-free compliance if required by environmental regulations.