LM2575T-5.0/LF03

Voltage Regulators - DC DC Switching Regulators Overview

The LM2575T-5.0/LF03 is a monolithic integrated circuit step-down switching voltage regulator from the Texas Instruments LM2575 series, housed in a TO-220-5 through-hole package. It provides a fixed 5V 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. Key electrical specifications include an output voltage accuracy of ±4%, a typical quiescent current of 50μA in standby mode, and a guaranteed efficiency of up to 77%. It supports an operating junction temperature range from -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates all active functions for a buck converter, including a fixed-frequency oscillator and internal frequency compensation, minimizing external component requirements.
• Includes built-in thermal shutdown and cycle-by-cycle current limiting to ensure system safety under fault conditions.
• Offers an external shutdown pin that reduces standby current to a typical value of 50μA.
• Designed as a direct replacement for three-terminal linear regulators, significantly reducing heat sink size or eliminating the need for one.

Voltage Regulators - DC DC Switching Regulators Applications

• Efficient point-of-load DC/DC conversion modules
• Pre-regulator stages for linear post-regulators
• High-efficiency forward converters

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix LF03 against the official Texas Instruments datasheet to confirm it denotes the standard TO-220-5 through-hole package variant. Ensure the ordering part number matches the required fixed 5.0V output specification. Cross-reference the manufacturer code to distinguish between original TI production and potential third-party manufacturing sources.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust, high-current (1A) step-down solution is required for through-hole PCB designs. It is suitable for applications where a fixed 5V output is needed from a wide input voltage range up to 40V. Consider the 52kHz switching frequency for inductor selection and the thermal performance limits defined by the TO-220 package.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM2575 family of SIMPLE SWITCHER power converters. The 'T' indicates the TO-220-5 package, while '5.0' specifies the fixed 5V output version. The 'NOPB' suffix typically denotes lead-free and RoHS compliance, whereas 'LF03' identifies the specific package and tape/reel or tube configuration details within the product line.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2575T-5.0/NOPB

Voltage Regulators - DC DC Switching Regulators FAQ

What is the maximum input voltage supported by the LM2575T-5.0?

The device supports a maximum input voltage of 40V.

Does the LM2575T-5.0 support external shutdown?

Yes, it includes an external shutdown feature that reduces the typical standby supply current to 50μA.