LM2576S-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The UMW LM2576S-3.3 is a monolithic integrated circuit designed as a step-down (buck) switching regulator. It provides a fixed 3.3V output with a maximum current capability of 3A. The device operates within an input voltage range of 4V to 40V and utilizes a fixed internal oscillator frequency of 52kHz. It features cycle-by-cycle current limiting and thermal shutdown protection. The component is housed in a TO-263-5L surface-mount package, suitable for applications requiring efficient voltage conversion with minimal external components.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Fixed 3.3V output voltage configuration
• Integrated 52kHz fixed-frequency oscillator
• Built-in thermal shutdown and current limiting protection

Voltage Regulators - DC DC Switching Regulators Applications

• Efficient replacement for three-terminal linear regulators
• Direct-from-battery step-down converters
• Post-regulation circuits for switching supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer designation on the component marking against the specified UMW origin. Confirm the package type matches the required TO-263-5L footprint. Ensure the suffix indicates the fixed 3.3V variant rather than adjustable or other voltage options. Check RoHS compliance status if environmental regulations apply to the final assembly.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V rail is required from an input source between 4V and 40V. The 52kHz switching frequency necessitates larger passive components compared to higher-frequency alternatives. Ensure adequate thermal management is planned, as heat dissipation depends on the input-output voltage differential and load current.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2576 series of SIMPLE SWITCHER regulators. The 'S' suffix denotes the surface-mount D2PAK/TO-263 package variant. The '-3.3' specifies the fixed output voltage. This series is widely recognized for simplifying switch-mode power supply design through reduced external component counts.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Cross-reference with LM2576S-3.3 from other manufacturers such as Texas Instruments or onsemi for pin-compatible substitution. Verify that alternative sources maintain the same 3A current rating and 40V maximum input voltage specifications.