LM2575T-3.3G

Voltage Regulators - DC DC Switching Regulators Overview

The LM2575T-3.3G is a monolithic integrated circuit from the LM2575 series, functioning as a step-down switching voltage regulator. It provides a fixed 3.3V output with a maximum current capacity of 1A. The device operates within an input voltage range of 4.75V to 40V and utilizes a fixed 52kHz oscillator frequency. Designed for through-hole installation, it is housed in a TO-220-5 package with formed leads. The component supports an operating junction temperature range from -40°C to +125°C and includes internal frequency compensation.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates all active functions required for a buck converter topology, including a built-in fixed-frequency oscillator and frequency compensation.
• Features include per-cycle current limiting and thermal shutdown protection to ensure system safety under fault conditions.
• Supports external shutdown functionality, enabling low standby current consumption when the device is not actively regulating.

Voltage Regulators - DC DC Switching Regulators Applications

• Direct replacement for three-terminal linear regulators to reduce heat dissipation requirements.
• Pre-regulator stages for downstream switching regulators.
• Efficient DC/DC conversion for battery-powered systems requiring stable 3.3V logic supplies.

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify RoHS compliance status carefully, as onsemi has issued Product Change Notices indicating end-of-life or material declaration updates for specific LM2575 variants. Confirm the 'G' suffix denotes current manufacturing availability and environmental compliance against the latest datasheet revision. Cross-reference ordering information with official distributor catalogs to ensure correct pinout and package specifications.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a simple, high-efficiency buck converter is needed for loads up to 1A. It is suitable for designs prioritizing minimal external component count and ease of implementation. Consider the TO-220-5 package for applications requiring robust thermal management via heatsinking without complex surface-mount assembly processes.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the SIMPLE SWITCHER family, known for simplifying power supply design. The LM2575 series distinguishes itself by offering fixed output voltages (3.3V, 5V, 12V, 15V) and adjustable versions. The 'T' suffix indicates the TO-220 package style, while 'G' typically signifies Green/RoHS-compliant packaging in onsemi's nomenclature.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2575T-3.3/NOPB (Texas Instruments)

Voltage Regulators - DC DC Switching Regulators FAQ

What is the typical efficiency of the LM2575T-3.3G?

Efficiency ranges from approximately 75% to 88%, depending on the specific input voltage and load current conditions.

Does the LM2575T-3.3G support synchronous rectification?

No, the LM2575T-3.3G uses a non-synchronous buck topology with an internal switch and external catch diode.