LM2575-3.3BN

Voltage Regulators - DC DC Switching Regulators Overview

The LM2575-3.3BN is a monolithic integrated circuit designed for step-down (buck) switching regulator applications, providing all necessary active functions to drive a 1A load. It features a fixed 3.3V output voltage with an input voltage range of 4V to 40V. The device operates at a switching frequency of 52kHz and utilizes a 16-pin Plastic DIP package. Key electrical characteristics include a maximum output current of 1A, a typical standby current of 50μA, and a maximum steady-state error of ±4%. The component supports external shutdown functionality and integrates thermal shutdown protection.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated buck switching regulator topology with fixed 3.3V output
• Built-in frequency compensation and fixed-frequency oscillator
• Internal current limit and thermal shutdown protection mechanisms
• Low standby current with external shutdown capability

Voltage Regulators - DC DC Switching Regulators Applications

• General-purpose step-down DC-DC power supplies
• Pre-regulators for switching linear regulators
• Efficient standard logic power supplies
• Battery-powered systems requiring high efficiency

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer status carefully as this specific part number may be obsolete or discontinued by Microchip Technology. Confirm availability through authorized distributors or alternative sources if direct manufacturing supply is unavailable. Ensure that any substitute components maintain identical pinout compatibility, electrical specifications, and package dimensions to guarantee seamless integration into existing designs without hardware modification.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a simple, cost-effective buck converter solution is required for 3.3V loads up to 1A. It serves as a direct replacement for three-terminal linear regulators in applications where heat dissipation is a concern. Consider the 52kHz switching frequency for passive component sizing and the wide input voltage range for versatile power source compatibility. Evaluate thermal performance requirements based on the DIP package's heat dissipation capabilities.

Voltage Regulators - DC DC Switching Regulators Part Context

The LM2575 series represents a family of high-efficiency step-down switching regulators widely used in industrial and commercial electronics. Manufactured by Microchip Technology (formerly Micrel/Motorola), these devices simplify switch-mode power supply design by minimizing external component count. The series includes various output voltages and packages, with the BN variant specifically denoting the 3.3V fixed output in a 16-DIP configuration.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Public records indicate the LM2575-3.3BN is obsolete. Suitable replacements include the LM2575-3.3N (standard DIP version) or surface-mount equivalents like LM2575-3.3SX if footprint adaptation is possible. Verify that substitutes match the 16-pin DIP form factor and 1A current rating.