L4972A

Voltage Regulators - DC DC Switching Regulators Overview

The L4972A is a step-down monolithic power switching regulator manufactured by STMicroelectronics. It delivers an output current of 2A with an adjustable voltage range from 5.1V to 40V. The device operates within an input voltage window of 15V to 50V and supports switching frequencies between 100kHz and 200kHz. It features a precise 5.1V internal reference and is housed in a 20-PowerDIP package. The component functions as a positive, single-output buck converter suitable for through-hole mounting.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates reset and power fail signals specifically designed for microprocessor supervision
• Utilizes BCD mixed technology with a DMOS output transistor for high efficiency and fast switching
• Includes comprehensive protection mechanisms such as thermal shutdown and internal current limiting

Voltage Regulators - DC DC Switching Regulators Applications

• Microprocessor power supply systems requiring supervision features
• Industrial control equipment utilizing through-hole regulation
• General-purpose step-down DC-DC conversion applications

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the obsolete status of this component before design finalization. Confirm that the 20-PowerDIP package dimensions match the target PCB footprint. Ensure the 2A current rating and 50V maximum input voltage align with system requirements. Check for available lifecycle management documentation from STMicroelectronics regarding end-of-life support.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this regulator when a robust through-hole solution with integrated microprocessor supervision is required. The fixed 5.1V reference simplifies initial startup configurations. Consider the 20-PowerDIP package constraints for thermal dissipation and board space. Evaluate the 100kHz to 200kHz switching frequency range against external filter component size limitations.

Voltage Regulators - DC DC Switching Regulators Part Context

The L4972A belongs to the L4972 series of switching regulators from STMicroelectronics. This family focuses on providing efficient step-down conversion with additional supervisory features. The device represents a legacy option for designs prioritizing through-hole assembly and integrated reset functionality over modern surface-mount alternatives.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.