L4974A

Voltage Regulators - DC DC Switching Regulators Overview

The L4974A is a step-down switching regulator IC manufactured by STMicroelectronics. It operates with an input voltage range of 15V to 50V and provides a positive adjustable output voltage from 5.1V to 40V. The device delivers a maximum output current of 3.5A through a single output channel. It utilizes a buck topology with a switch frequency ranging from 100kHz to 200kHz. The component is housed in a 20-PowerDIP package for through-hole mounting and supports a junction temperature operating range of -40°C to +150°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates an internal power D-MOS transistor for high efficiency and fast switching times
• Includes pulse-by-pulse current limiting and hiccup mode for output short-circuit protection
• Features thermal shutdown and protection against feedback loop disconnection
• Supports input/output synchronization and soft start functionality

Voltage Regulators - DC DC Switching Regulators Applications

• Industrial control systems requiring isolated or non-isolated DC-DC conversion
• Embedded power supplies for microprocessor-based applications
• General-purpose step-down voltage regulation in automotive environments

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific package variant, as the L4974A designation may correspond to different pinouts or suffixes depending on the manufacturer's documentation. Confirm availability status, as this component is listed as obsolete in several distributor databases. Ensure that the selected replacement part matches the required output current and voltage specifications if sourcing alternatives due to end-of-life status.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust, through-hole buck converter is needed for moderate current applications up to 3.5A. Consider the wide input voltage range suitable for industrial bus voltages. Evaluate thermal management requirements given the DIP packaging and high junction temperature rating. Compare against newer generations for improved efficiency or smaller footprint options if space constraints exist.

Voltage Regulators - DC DC Switching Regulators Part Context

The L4974A belongs to the L497x series of monolithic power switching regulators from STMicroelectronics. This family is designed for versatile DC-DC conversion tasks using BCD mixed technology. The series typically includes variants with different output currents and fixed voltage options, catering to various power management needs in industrial and automotive sectors.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

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