LM2576D2T-3.3G

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576D2T-3.3G is a monolithic integrated circuit from the LM2576 series, functioning as a step-down switching regulator (buck converter). Manufactured by onsemi, this device is designed to drive a 3.0 A load with excellent line and load regulation capabilities. It operates with a fixed internal oscillator frequency of 52 kHz and accepts an input voltage range up to 40 V. The component provides a fixed output voltage of 3.3 V and is housed in a surface-mount TO-263 package with five pins. It includes internal frequency compensation and requires minimal external components for operation.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Provides high-efficiency replacement for linear regulators with guaranteed 3A output current capability
• Features a fixed 52 kHz internal oscillator requiring only four external components
• Includes cycle-by-cycle current limiting and thermal shutdown protection under fault conditions
• Supports external shutdown control with low standby current consumption

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 regulators
• Positive-to-negative converter topologies
• Battery charger power supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'D2T' against the manufacturer's official datasheet to confirm the exact tape-and-reel packaging configuration and pinout orientation. Ensure the ordering part number matches the required RoHS compliance status and temperature grade specifications. Cross-reference the manufacturer's latest documentation to confirm availability and any potential design changes or obsolescence notices associated with this specific surface-mount variant.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust 3A buck converter solution is required with a maximum input voltage of 40V. The fixed 3.3V output eliminates the need for external feedback resistors, simplifying the bill of materials. Consider the 52 kHz switching frequency, which necessitates larger passive components compared to modern high-frequency alternatives. Verify that the thermal performance of the TO-263 package meets the system's heat dissipation requirements without excessive heatsinking.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the LM2576 series of SIMPLE SWITCHER power controllers, originally developed by National Semiconductor and now produced by onsemi. The series is widely recognized for its simplicity and reliability in medium-power DC-DC conversion applications. The 'D2T' designation specifically indicates the surface-mount TO-263 package variant, distinguishing it from through-hole TO-220 or smaller SOP packages within the same functional family.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct replacements include other manufacturers' LM2576-3.3 variants such as those from Texas Instruments or STMicroelectronics, provided the pinout and electrical characteristics match. For improved efficiency or size, consider upgrading to synchronous buck converters with higher switching frequencies, though these may require different control loop compensation.