LM2576T-3.3/LF03

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576T-3.3/LF03 is a step-down switching regulator from Texas Instruments, operating at a fixed 52 kHz frequency. It provides a regulated 3.3V output with an input voltage range up to 40V and supports load currents up to 1A. The device integrates a monolithic switching element and includes internal compensation for stability. Key electrical specifications include a typical quiescent current of 8mA and a maximum duty cycle of 90%. It features thermal shutdown and current limit protection mechanisms.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated high-current switching transistor eliminates the need for external power switches
• Fixed 52kHz oscillating frequency allows use of small inductors and capacitors
• Internal frequency compensation simplifies design and ensures stable operation
• Built-in thermal shutdown and current limiting protect against overload conditions

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for digital circuits
• Pre-regulator stages for switching regulators
• Efficient step-down conversion from higher bus voltages

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the exact suffix LF03 against the manufacturer's official datasheet to confirm package type and temperature grade. Ensure compatibility with your PCB footprint and thermal requirements. Cross-reference part numbers with authorized distributors to avoid counterfeit components. Confirm that the specified 3.3V output matches your system voltage needs before procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a simple, cost-effective step-down solution is required for moderate current loads. It is suitable for applications where efficiency and minimal external component count are priorities. Consider the 52kHz frequency trade-off between size and EMI. Verify input voltage ranges do not exceed the 40V absolute maximum rating under all operating conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2576 family of adjustable and fixed-output switching regulators. It is designed as a direct replacement for older linear regulators in many applications, offering significantly higher efficiency. The T-3.3 variant specifically provides a fixed 3.3V output, simplifying design for standard logic levels.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct pin-compatible alternatives may include other LM2576 variants with different output voltages or packages. Check for updated revisions from Texas Instruments. Ensure substitute parts maintain the same 52kHz frequency and current handling capabilities if system constraints require it.