LM2576T-ADJ/LF03

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576T-ADJ/LF03 is a monolithic integrated circuit from the Texas Instruments SIMPLE SWITCHER series, designed as a step-down switching regulator. It operates with an input voltage range of 4V to 40V and delivers a maximum output current of 3A. The device features an adjustable output voltage controlled by external resistors, utilizing a fixed internal reference voltage of approximately 1.23V. It functions at a nominal switching frequency of 52kHz. The component is housed in a TO-220-5 through-hole package and supports an operating temperature range from -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a 3A capable power switch for high-current step-down conversion
• Utilizes fixed-frequency pulse width modulation control architecture
• Includes internal thermal shutdown and current limit protection mechanisms

Voltage Regulators - DC DC Switching Regulators Applications

• Distributed power supply systems requiring buck conversion
• Pre-regulators for linear post-regulator circuits
• Efficient on-board DC/DC step-down converters

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix LF03 against the manufacturer datasheet to confirm lead-free compliance and RoHS status. Ensure the ordering part number matches the required TO-220-5 package variant. Confirm availability status directly with authorized distributors as lifecycle stages may vary.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when an adjustable output voltage is required within the 4V to 40V input range. It is suitable for designs needing up to 3A load current with minimal external components. Consider the thermal performance of the TO-220 package for heat dissipation requirements in the target application environment.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2576 family of SIMPLE SWITCHER regulators, which are widely used for efficient DC-DC conversion. The LM2576 series distinguishes itself from the LM2575 series by offering higher current capability. The 'ADJ' designation indicates an adjustable output version, contrasting with fixed-voltage variants like the 5.0V or 3.3V models.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct pin-compatible substitutes include LM2576T-ADJ/NOPB and LM2576T-ADJ/LB03. Cross-manufacturer equivalents such as ON Semiconductor MC34063 variants may require circuit redesign due to different control architectures.