L4972AD

Voltage Regulators - DC DC Switching Regulators Overview

The L4972AD is a step-down monolithic power switching regulator from STMicroelectronics, delivering an output current of 2A with an adjustable voltage range from 5.1V to 40V. It utilizes BCD mixed technology and a DMOS output transistor for high efficiency and fast switching times up to 200kHz. The device features internal feed-forward line regulation, thermal shutdown, and under-voltage lockout. It is housed in a 20-DIP (PowerDIP) package and operates within a junction temperature range of -40°C to 150°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates reset and power fail functions specifically designed for microprocessor supervision.
• Includes soft start capability to limit inrush current during startup.
• Features internal current limiting and thermal protection for enhanced reliability.
• Supports input/output synchronization via dedicated pins.

Voltage Regulators - DC DC Switching Regulators Applications

• Microprocessor power supply systems requiring supervision signals.
• Industrial control equipment utilizing buck converter topologies.
• Automotive electronics applications compatible with wide input voltage ranges.
• General-purpose DC-DC conversion in embedded systems.

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix 'AD' corresponds to the required package variant. Check for obsolescence status as this series may be discontinued. Ensure compatibility with existing PCB footprints for the 20-PowerDIP package. Review latest datasheet revisions for any pinout or electrical specification updates before finalizing procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select the L4972AD when a robust 2A buck regulator with integrated microprocessor supervision is required. It is suitable for designs needing wide input voltage tolerance and high efficiency at switching frequencies up to 200kHz. Consider the through-hole PowerDIP package if board space allows for larger components. Evaluate thermal management requirements given the 150°C junction temperature rating. Compare against newer synchronous alternatives if higher efficiency at light loads is critical.

Voltage Regulators - DC DC Switching Regulators Part Context

The L4972AD belongs to the L4972 family of switching regulators manufactured by STMicroelectronics. This family is characterized by its use of BCD technology, combining bipolar, CMOS, and DMOS processes on a single chip. The L4972 series is designed for applications demanding high input voltages and reliable operation in noisy environments. It serves as a legacy solution for industrial and automotive systems requiring integrated power management features.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify cross-reference data with official STMicroelectronics resources or authorized distributors for potential replacements.