LM2576HVS-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576HVS-3.3 is a monolithic integrated circuit providing active functions for a step-down (buck) switching regulator. It delivers a fixed 3.3V output with a maximum load current of 3A. The device supports an input voltage range up to 57V and operates at a fixed switching frequency of 52kHz. It utilizes a TO-263-5L package and functions within a temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Fixed 3.3V output voltage with guaranteed regulation under specified conditions
• Integrated high-side NPN switch capable of driving 3A loads
• Internal 52kHz fixed-frequency oscillator eliminates external timing components
• Includes cycle-by-cycle current limiting and thermal shutdown protection

Voltage Regulators - DC DC Switching Regulators Applications

• Efficient replacement for three-terminal linear regulators in high-current applications
• Pre-regulator stages for downstream linear power supplies
• Direct conversion from higher bus voltages to 3.3V logic levels
• Isolated DC-DC converter control circuits using flyback topologies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer designation on the component marking, as UMW produces this part distinct from Texas Instruments equivalents. Confirm the suffix indicates the specific fixed 3.3V output variant rather than the adjustable version. Ensure the TO-263-5L package matches the target PCB footprint requirements before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V rail is required from an input source exceeding 4V but below 57V. The fixed output simplifies design by removing feedback resistors compared to the ADJ variant. Consider the 52kHz switching frequency for inductor selection and ensure adequate thermal management for the TO-263 package given the 3A current capability.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2576HV series, designed for high-voltage input applications compared to the standard 40V LM2576. It serves as a robust solution for industrial and automotive systems requiring efficient buck conversion. The 'S' suffix typically denotes the surface-mount TO-263 package variant within the family.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2576HVS-3.3/NOPB