LM2576D2TR4-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576D2TR4-3.3 is a monolithic integrated circuit from the LM2576 series, functioning as a step-down (buck) switching regulator manufactured by onsemi. It provides a fixed output voltage of 3.3V with a guaranteed maximum output current of 3A. The device operates with an input voltage range up to 40V and utilizes a fixed-frequency internal oscillator at 52kHz. Designed for surface-mount applications, it is housed in a TO-263-6 (D2PAK-5) package. The component ensures excellent line and load regulation with a typical efficiency exceeding 75% and includes built-in thermal shutdown and cycle-by-cycle current limiting protection.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a fixed-frequency 52kHz oscillator and internal frequency compensation to minimize external component requirements.
• Provides high-efficiency replacement capability for traditional three-terminal linear regulators.
• Includes comprehensive protection mechanisms such as thermal shutdown and cycle-by-cycle current limiting.

Voltage Regulators - DC DC Switching Regulators Applications

• Simple and efficient step-down (buck) DC-DC converters
• High-efficiency pre-regulators for linear power supplies
• On-card switching regulator implementations

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the specific suffix 'D2TR4' corresponds to the D2PAK-5 surface mount package and tape-and-reel shipping configuration. Confirm the manufacturer is onsemi or an authorized licensee, as this part number originates from National Semiconductor. Ensure the revision level matches the required datasheet specifications for electrical tolerances and pinout compatibility before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required from an input voltage source up to 40V. It is suitable for designs prioritizing simplicity and cost-effectiveness over high-frequency operation. Consider the 52kHz switching frequency, which necessitates larger passive components compared to modern high-frequency alternatives. Ensure adequate thermal management is planned if operating near the 3A current limit.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2576 family of 3A adjustable and fixed-output buck converters. Originally developed by National Semiconductor, the product line has been transferred to onsemi. The series is characterized by its robustness and ease of design, requiring only four external components to function. It serves as a legacy solution for medium-power DC-DC conversion tasks where high switching frequencies are not a primary constraint.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include the LM2576S-3.3 (TO-263 package) and LM2576T-3.3 (TO-220 package). Cross-manufacturer equivalents such as the Texas Instruments LM2576SX-3.3/NOPB offer pin-compatible functionality. Verify that any replacement maintains the same 3.3V fixed output and 3A current rating.