LM2576T-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576T-3.3G 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 3.3 V with a guaranteed maximum output current of 3 A. The device operates at a fixed internal oscillator frequency of 52 kHz and supports an input voltage range up to 40 V. It utilizes pulse width modulation (PWM) control mode and features cycle-by-cycle current limiting and thermal shutdown protection. The component is housed in a TO-220-5 through-hole package and is rated for a junction temperature operating range from -40 °C to +125 °C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated buck converter topology capable of driving a 3 A load with excellent line and load regulation.
• Includes internal frequency compensation and a fixed-frequency oscillator to minimize external component count.
• Features external shutdown capability with low standby current consumption.
• Provides comprehensive protection via cycle-by-cycle current limiting and thermal shutdown under fault conditions.

Voltage Regulators - DC DC Switching Regulators Applications

• Simple and efficient step-down (buck) DC-DC regulators
• High-efficiency pre-regulators for linear regulators
• On-card switching regulators
• Positive-to-negative converter implementations

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'G' indicates RoHS compliance status according to the manufacturer's datasheet. Confirm the package type matches the required TO-220-5 through-hole configuration for your PCB layout. Check the product lifecycle status, as this part may be subject to discontinuation or obsolescence notices from onsemi. Ensure the supplier provides valid traceability documentation for the component batch.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3 V output is required from an input voltage up to 40 V. It is suitable for designs prioritizing simplicity and cost-effectiveness over high-frequency efficiency. Consider the thermal requirements carefully, as the TO-220 package may require heat sinking depending on the load current and ambient temperature. Verify that the 52 kHz switching frequency aligns with the available standard inductor values for your design.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2576 series of SIMPLE SWITCHER power converters, which are widely recognized for their ease of use in basic switching power supply designs. The series includes various fixed voltage options and an adjustable version. The LM2576T variant specifically denotes the through-hole TO-220 package form factor, distinguishing it from surface-mount versions like the LM2576S or LM2576M.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The LM2576T-3.3 is functionally interchangeable with other manufacturers' LM2576T-3.3 parts, such as those from Texas Instruments or Semtech, provided pinouts and electrical specifications match. Verify compatibility with existing inductors optimized for the 52 kHz frequency. Do not assume direct replacement with LM2576HV variants without checking input voltage limits.