LM2575T-ADJ/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2575T-ADJ/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 V to 40 V and delivers up to 1 A of output current. The device utilizes a fixed internal oscillator operating at approximately 52 kHz, enabling efficient power conversion with minimal external components. Designed for through-hole mounting in a TO-220-5 package, it supports adjustable output voltages ranging from 1.23 V to the maximum input limit. Key electrical characteristics include a typical quiescent current of 5 mA and a shutdown mode reducing standby current to 50 µA.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated fixed-frequency oscillator simplifies design by eliminating external timing components
• Built-in thermal shutdown and cycle-by-cycle current limiting ensure operational safety under fault conditions
• External shutdown pin allows for low-power standby modes with minimal quiescent current consumption

Voltage Regulators - DC DC Switching Regulators Applications

• Distributed power supply systems requiring buck conversion
• Pre-regulator circuits for linear post-regulators
• Efficient on-card regulation for boards powered directly from bus supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'NOPB' confirms lead-free and RoHS compliance status according to the manufacturer's latest documentation. Confirm the 'T' designation corresponds to the TO-220-5 through-hole package variant rather than surface-mount options. Ensure the component is sourced from authorized distributors to guarantee authenticity and traceability for critical applications.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust, high-current buck converter is required for through-hole PCB assembly. It serves as a direct replacement for standard three-terminal linear regulators where significant heat dissipation reduction is necessary. Consider the 52 kHz switching frequency when selecting external inductors and capacitors to balance size and performance requirements.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2575 series, a widely used line of simple-switcher regulators known for ease of use and flexibility. The series includes fixed-output variants (3.3V, 5V, 12V, 15V) and adjustable versions like this one. The TO-220-5 package provides superior thermal handling compared to smaller surface-mount packages, making it suitable for higher power densities in industrial or automotive environments.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct functional equivalents within the same family include other LM2575 adjustable variants such as LM2575HVT-ADJ for higher input voltage ranges. For surface-mount replacements, consider the LM2575S-ADJ series. Verify that substitute parts maintain compatible pinouts and thermal characteristics if physical footprint constraints exist.