LM2575S-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2575S-3.3 is a fixed-output buck switching regulator IC from the SIMPLE SWITCHER series, manufactured by National Semiconductor. It provides a regulated 3.3V output with a maximum current capacity of 2A. The device operates with an input voltage range up to 40V and utilizes a 150kHz switching frequency. Packaged in TO-263-6 (D2PAK) surface-mount format, it integrates internal compensation and oscillation circuitry for simplified design.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a fixed-frequency oscillator and internal frequency compensation to minimize external component requirements.
• Includes built-in thermal shutdown and cycle-by-cycle current limiting for enhanced operational safety.
• Supports external control pin functionality to enable low-power standby modes via logic-level signals.

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load DC/DC conversion modules
• Pre-regulation stages for linear voltage regulators
• Efficient step-down power supplies for embedded systems

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer origin, as Texas Instruments acquired National Semiconductor's analog portfolio. Confirm that the specific suffix corresponds to the TO-263 package variant. Ensure compliance with RoHS directives if required for the target assembly process. Cross-reference datasheets to confirm the 2A rating aligns with the specific revision.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required with higher current demands than standard 1A variants. The 150kHz frequency allows for smaller passive components compared to older 52kHz designs. Evaluate thermal dissipation capabilities in the TO-263 package under maximum load conditions to ensure reliable operation within the specified temperature range.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2575 family of monolithic integrated step-down switching regulators. While the original LM2575 series operated at 52kHz with 1A ratings, the S-series variants often feature updated specifications such as increased current handling and higher switching frequencies to improve power density and reduce external filter size.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2575T-3.3/NOPB: Pin-compatible alternative with similar electrical characteristics but potentially different packaging or manufacturing origin.

Voltage Regulators - DC DC Switching Regulators FAQ

What is the switching frequency of the LM2575S-3.3?

The LM2575S-3.3 operates at a fixed switching frequency of 150kHz.

Does the LM2575S-3.3 include internal feedback resistors?

Yes, the fixed-output version includes internal feedback networks, requiring only one external inductor and diode for basic operation.