LM2575-3.3WU-TR

Voltage Regulators - DC DC Switching Regulators Overview

The LM2575-3.3WU-TR is a fixed-output step-down switching regulator manufactured by Microchip Technology, operating at a standard 52 kHz frequency. It provides a fixed 3.3V output with a maximum load current of 1A, accepting an input voltage range from 4V to 40V. The device utilizes a non-synchronous buck topology and is housed in a TO-263-5 (D2PAK) surface-mount package. Designed for industrial reliability, it supports junction temperatures from -40°C to 125°C and includes internal frequency compensation, thermal shutdown, and current limiting features.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a 3.2A internal power switch for efficient step-down regulation
• Includes built-in frequency compensation to minimize external component count
• Features thermal shutdown and current limit protection for system safety

Voltage Regulators - DC DC Switching Regulators Applications

• Efficient point-of-load DC-DC conversion modules
• Pre-regulator stages for linear post-regulation circuits
• Positive-to-negative voltage inversion topologies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'TR' indicates tape-and-reel packaging rather than tube packaging when sourcing. Confirm the manufacturer designation as Microchip Technology, noting historical lineage from National Semiconductor or Micrel if applicable to legacy documentation. Ensure RoHS compliance status matches current manufacturing standards before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component for applications requiring a simple, robust buck converter with minimal external circuitry. The fixed 3.3V output eliminates the need for external feedback resistors. Consider the TO-263-5 package for its thermal dissipation capabilities relative to smaller SMD packages. Verify that the 52kHz switching frequency aligns with electromagnetic interference requirements for the target design.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2575 family of monolithic integrated step-down converters. The series is known for simplicity and reliability, offering both adjustable and fixed output voltage options. The LM2575-3.3 variant specifically targets 3.3V logic supply generation from higher voltage rails, serving as a foundational component in general-purpose power management designs.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2575-3.3WU is the tube-packaged equivalent with identical electrical specifications. LM2592HVS-3.3/NOPB is a documented alternative offering similar functionality with different thermal characteristics.