LM2575M-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2575M-3.3/NOPB is a monolithic integrated circuit from the Texas Instruments SIMPLE SWITCHER family, functioning as a step-down switching voltage regulator. It operates with an input voltage range of 4.75 V to 40 V and provides a fixed 3.3 V output capable of driving up to 1 A load current. The device utilizes a buck topology with a typical switching frequency of 52 kHz. Designed for surface-mount applications, it is housed in a PowerPAD TO-263 package. The component supports operation across a temperature range of -40°C to +125°C and includes internal features such as frequency compensation, current limiting, and thermal shutdown.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates all active functions required for a buck converter, including a built-in fixed-frequency oscillator and frequency compensation.
• Incorporates thermal shutdown protection and cycle-by-cycle current limiting to ensure system safety under fault conditions.
• Supports external shutdown control via the ON/OFF pin, enabling low standby current consumption.

Voltage Regulators - DC DC Switching Regulators Applications

• Distributed power supply systems requiring efficient step-down conversion
• Pre-regulator circuits for linear regulators
• Efficient buck converters for battery-powered equipment

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the ordering suffix matches the specific package variant, as the LM2575 series includes distinct packages such as TO-220, TO-263, and SO-8. Confirm the presence of the PowerPAD thermal pad if heat dissipation is critical for the application. Ensure the selected part number corresponds to the correct output voltage tolerance and switching frequency specifications defined in the official datasheet.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust, high-current step-down solution is needed without complex external compensation requirements. The fixed 3.3 V output eliminates the need for external feedback resistors, simplifying the design. Consider the thermal performance of the PowerPAD package for high-load applications and verify compatibility with standard inductor values optimized for the 52 kHz switching frequency.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2575 series of SIMPLE SWITCHER regulators, which are designed as direct replacements for traditional three-terminal linear regulators. The series offers significant improvements in efficiency and reduced heat generation. The 'M' designation indicates the surface-mount PowerPAD TO-263 package, while '/NOPB' signifies a lead-free, halogen-free construction compliant with RoHS standards.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct functional equivalents include the LM2575T-3.3/NOPB (TO-220 package) and LM2575S-3.3/NOPB (TO-263 package). When substituting, verify that the thermal characteristics and pinout configurations of the alternative package are compatible with the existing PCB layout and cooling strategy.