L4975A

Voltage Regulators - DC DC Switching Regulators Overview

The L4975A is a step-down monolithic power switching regulator delivering 5A output current at voltages ranging from 5.1V to 40V. It utilizes BCD mixed technology with a DMOS output transistor for high efficiency and fast switching times up to 500kHz. The device operates within an input voltage range of 15V to 50V, housed in a 15-lead Multiwatt plastic package. Key electrical parameters include a precise 5.1V ±2% on-chip reference, 2.5mA static current, and a duty cycle range of 0% to 90%. It supports continuous mode operation and functions across temperatures from -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 internal feed-forward line regulation to enhance stability against input variations.
• Features soft start capability to limit inrush current during startup sequences.
• Provides comprehensive protection through internal current limiting and thermal shutdown mechanisms.

Voltage Regulators - DC DC Switching Regulators Applications

• Microprocessor power supply systems requiring supervision features
• Industrial control equipment power stages
• Automotive electronics applications

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific package variant and manufacturer date code upon ordering. Confirm that the application environment remains within the specified operating temperature range of -40°C to +150°C. Ensure external component selection aligns with the 500kHz switching frequency requirements to maintain optimal efficiency and thermal performance.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust buck converter with integrated supervisor functions is required. It is suitable for designs needing high efficiency at 5A loads without complex external control loops. Consider the Multiwatt package for through-hole mounting needs where thermal dissipation is critical.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to STMicroelectronics' L497x series of switching regulators. These devices are engineered for high-power density applications using BCD technology. The series emphasizes reliability and ease of implementation by minimizing external component counts while providing essential protection features for sensitive digital loads.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Check official datasheets for direct pin-compatible alternatives within the same family. Verify that any substitute maintains the 5A current rating and 500kHz switching frequency specifications.