LM2578AN

Voltage Regulators - DC DC Switching Regulators Overview

The LM2578AN is a monolithic integrated circuit step-down switching regulator from National Semiconductor, housed in an 8-pin PDIP package. It provides a fixed output voltage of 12V with a maximum output current capability of 3A. The device operates with an input voltage range up to 40V and includes internal frequency compensation for stability without external components. Key electrical specifications include a typical quiescent current of 8mA and a shutdown current of less than 100µA. It features thermal shutdown and current limit protection, operating reliably within a temperature range of 0°C to 70°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated high-frequency oscillator eliminates the need for external timing components
• Internal frequency compensation ensures stable operation across various load conditions
• Built-in thermal shutdown and current limiting protect against overload and overheating

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load DC/DC conversion modules
• Pre-regulators for post-switching regulators
• Efficient buck converters for battery-powered systems

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer origin, as National Semiconductor assets are managed by Texas Instruments. Confirm the specific suffix 'AN' corresponds to the PDIP-8 package and 12V fixed output variant. Check datasheet revisions for any changes in pinout or absolute maximum ratings compared to legacy documentation.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 12V output is required at currents up to 3A. It is suitable for applications prioritizing simplicity over adjustable voltage ranges. Ensure the input voltage does not exceed 40V and that adequate heat sinking is provided for high-power dissipation scenarios due to the linear package thermal characteristics.

Voltage Regulators - DC DC Switching Regulators Part Context

The LM2578 series belongs to a family of simple-to-use step-down switching regulators designed for high-efficiency power conversion. Unlike linear regulators, these devices minimize heat generation during voltage reduction. The LM2578 specifically targets industrial and commercial applications requiring robust, cost-effective power management solutions with minimal external component count.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Cross-reference with LM2578-12/NOPB for RoHS-compliant equivalents. Verify pin compatibility and thermal performance when substituting with modern alternatives from Texas Instruments or other manufacturers offering similar 3A buck converter architectures.