L4963W

Voltage Regulators - DC DC Switching Regulators Overview

The L4963W is a monolithic step-down switching regulator IC from STMicroelectronics, designed for discontinuous variable frequency operation. It delivers an output current of 1.5A with an adjustable output voltage range from 5.1V to 36V. The device accepts an input voltage up to 46V and operates within a temperature range of -40°C to +150°C. Key electrical characteristics include a typical efficiency of 80% and a switching frequency of 60kHz. It integrates precise on-chip reference regulation with ±2% accuracy.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates thermal shutdown and internal current limiting for robust protection
• Provides dedicated reset and power fail outputs specifically for microprocessor support
• Operates in discontinuous variable frequency mode to minimize external component requirements
• Features remote inhibit capability for system-level control

Voltage Regulators - DC DC Switching Regulators Applications

• Microprocessor power supply systems requiring reset signals
• Industrial equipment utilizing wide input voltage ranges
• Embedded systems needing efficient buck conversion with thermal protection
• Battery-powered devices requiring low standby consumption via remote inhibit

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'W' indicates the 18-DIP package variant when ordering. Confirm that the application requires the adjustable output range rather than fixed voltage versions. Ensure compatibility with the required operating temperature range of -40°C to +150°C. Check for obsolete status implications if sourcing through secondary distributors. Validate pinout compatibility with existing PCB layouts using the 18-DIP footprint.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a wide input voltage range up to 46V is necessary alongside high efficiency. It is suitable for designs requiring integrated microprocessor supervision features without additional logic chips. Consider the 18-DIP package constraint for through-hole assembly requirements. Evaluate the discontinuous mode operation against noise sensitivity constraints in the target application environment.

Voltage Regulators - DC DC Switching Regulators Part Context

The L4963 series belongs to STMicroelectronics' legacy power management portfolio, specifically designed as monolithic DC-DC converters. The L4963W variant distinguishes itself by offering the 18-pin DIP package option compared to other plastic packages like Powerdip or SO20 available in the broader family. This part represents a solution for applications prioritizing ease of prototyping and through-hole mounting over surface area minimization.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes may include other STMicroelectronics buck regulators with similar current ratings and input voltage capabilities. Verify pin-to-pin compatibility before replacing, particularly regarding the 18-DIP configuration. Cross-reference functional equivalents from other manufacturers ensuring matching thermal and electrical specifications.