LM2575-3.3WU

Voltage Regulators - DC DC Switching Regulators Overview

The LM2575-3.3WU is a monolithic integrated circuit step-down switching regulator manufactured by Microchip Technology, belonging to the LM2575 series. It provides a fixed 3.3V output with a maximum load current of 1A. The device operates within an input voltage range of 4V to 40V and utilizes a buck topology with a typical switching frequency of 52kHz. It features internal frequency compensation and a fixed-frequency oscillator, requiring minimal external components for operation. The component is housed in a TO-263-5 (D2PAK) surface-mount package and supports junction temperatures from -40°C to 125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a fixed-frequency oscillator and internal frequency compensation to simplify design requirements.
• Includes built-in thermal shutdown and current limit protection mechanisms for system safety.
• Offers high efficiency compared to linear regulators, reducing heat dissipation needs.

Voltage Regulators - DC DC Switching Regulators Applications

• Efficient step-down DC-DC power supply conversion
• Pre-regulator stages for downstream linear regulators
• Positive-to-negative converter topologies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer marking on the component body to confirm it originates from Microchip Technology, as this part number may also be produced by other vendors under license. Ensure the suffix 'WU' corresponds to the specific TO-263-5 tape-and-reel or tube packaging variant required for your assembly process. Cross-reference the date code and lot number against the official datasheet revision history to ensure compliance with current RoHS and REACH environmental standards.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output at up to 1A is required from an input source between 4V and 40V. It is suitable for designs prioritizing simplicity over adjustable output flexibility. Consider the thermal performance of the TO-263 package relative to the expected ambient temperature and load conditions. This part is appropriate for general-purpose industrial and commercial applications where moderate switching frequencies are acceptable.

Voltage Regulators - DC DC Switching Regulators Part Context

This device is part of the broader LM2575 family of switching regulators, which includes various fixed voltage options (such as 5V, 12V, 15V) and adjustable versions. The family is known for replacing traditional three-terminal linear regulators to achieve higher efficiency and smaller form factors. The LM2575-3.3WU specifically targets applications needing a stable 3.3V rail with robust protection features in a surface-mount footprint.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2592HVS-3.3/NOPB is a documented substitute option available from Texas Instruments.