E-L4971D013TR

Overview

The E-L4971D013TR is a step-down monolithic power switching regulator from STMicroelectronics, delivering up to 1.5A output current with an adjustable voltage range of 3.3V to 50V. It operates within an input voltage window of 8V to 55V and supports switching frequencies up to 300kHz. The device utilizes BCD mixed technology with an internal power D-MOS transistor featuring a typical Rdson of 0.25Ω. It includes features such as pulse-by-pulse current limit, hiccup mode for short circuit protection, soft-start, thermal shutdown, and inhibit functionality for zero current consumption. The component is housed in an SOIC-16 package.

Feature Summary

• Integrated pulse-by-pulse current limiting with hiccup mode for robust short-circuit protection
• Inhibit pin enables zero current consumption when the device is disabled
• Built-in thermal shutdown and protection against feedback loop disconnection
• Soft-start function limits inrush current during power-up sequences

Applications

• General-purpose DC-DC step-down conversion in industrial equipment
• Power supply stages for embedded systems requiring 3.3V to 50V outputs
• Battery-powered applications utilizing wide input voltage ranges

Procurement Notes

Verify the exact suffix and marking on the physical component against the manufacturer's datasheet to confirm authenticity. Ensure the ordering part number matches the specific package variant required for your PCB layout. Cross-reference the date code and lot information with official distributor records to validate supply chain integrity before finalizing procurement.

Selection Notes

Select this regulator for designs requiring high efficiency at moderate currents up to 1.5A. The wide 8V to 55V input range accommodates various bus voltages. Consider the SOIC-16 package dimensions for thermal management and board space constraints. Evaluate the need for external frequency adjustment if synchronization or specific noise profiles are required for the application.

Part Context

This component belongs to the L4971 series of step-down switching regulators manufactured by STMicroelectronics. It is designed for applications needing reliable power conversion with integrated protection features. The series leverages BCD technology to combine control logic with high-voltage power MOSFETs, ensuring compact design and high performance in standard surface-mount packages.

Replacement Considerations

Direct substitutes include other L4971 variants with different packaging options, such as DIP-8 for through-hole assembly. Verify compatibility regarding pinout, thermal characteristics, and electrical specifications when considering alternative packages or updated revisions within the same product family.