LM2576-3.3WU

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576-3.3WU is a monolithic integrated circuit step-down (buck) switching regulator manufactured by Microchip Technology. It provides a fixed 3.3V output capable of driving a 3A load with excellent line and load regulation. The device operates with a fixed-frequency internal oscillator at 52 kHz and accepts input voltages up to 40V. It utilizes pulse-width modulation (PWM) control and includes built-in thermal shutdown and current limiting protection. The component is housed in a TO-263-5 surface-mount package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated 52 kHz fixed-frequency oscillator simplifies external component requirements
• Built-in thermal shutdown and cycle-by-cycle current limit protection
• TTL-compatible shutdown capability for low power standby modes

Voltage Regulators - DC DC Switching Regulators Applications

• Simple high-efficiency step-down (buck) regulators
• Efficient pre-regulators for linear regulators
• On-card switching regulators
• Positive to negative converter (buck-boost) circuits

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer designation on the datasheet, as the LM2576 series was originally developed by National Semiconductor and is now produced by multiple vendors including Microchip. Confirm that the specific 'WU' suffix corresponds to the correct TO-263-5 surface mount package variant. Ensure compliance with RoHS directives if required for the target application environment.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required from an input voltage range up to 40V. It is suitable for designs needing a guaranteed 3A output current without complex external compensation networks. Consider the TO-263-5 package for surface-mount assembly where thermal dissipation capabilities are necessary for high-current loads.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2576 series of SIMPLE SWITCHER voltage regulators. The series is characterized by its ease of use, requiring only four external components to function. It serves as a high-efficiency replacement for traditional three-terminal linear regulators, significantly reducing heat sink size and overall system cost in DC-to-DC conversion applications.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Compatible replacements include LM2576-3.3T-ADJ variants or equivalents from other manufacturers such as onsemi or Semtech, provided they maintain the 3A current rating, 52 kHz frequency, and 3.3V fixed output specification.