L4963D

Voltage Regulators - DC DC Switching Regulators Overview

The L4963D is a monolithic step-down switching regulator manufactured by 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 between 9V and 46V. It operates within a junction temperature range of -40°C to +150°C and features a switching frequency between 42kHz and 83kHz. The component is housed in a 20-SOIC surface-mount package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated thermal shutdown and internal current limiting for robust protection
• Includes dedicated reset and power fail outputs suitable for microprocessor supervision
• Requires minimal external components due to integrated reference and control circuitry
• Features remote inhibit capability for system power management

Voltage Regulators - DC DC Switching Regulators Applications

• Microprocessor power supply systems requiring reset signals
• Industrial equipment power regulation
• Automotive electronic subsystems
• General-purpose DC-DC step-down conversion

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix D indicates the SOIC package variant when sourcing. Confirm end-of-life status as the component is listed as obsolete. Ensure compatibility with existing PCB footprints for the 20-SOIC form factor during design updates or maintenance.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component for applications requiring high efficiency in discontinuous mode with integrated processor supervision features. Consider the wide input voltage range and adjustable output for flexible design requirements. Evaluate thermal performance given the high operating temperature rating and surface-mount packaging constraints.

Voltage Regulators - DC DC Switching Regulators Part Context

The L4963D belongs to the L4963 family of monolithic buck converters from STMicroelectronics. It shares core functionality with the through-hole L4963 variant but utilizes a surface-mount 20-SOIC package. This series targets automotive and industrial markets with high reliability standards.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. As the component is obsolete, consult manufacturer resources for direct replacements or evaluate alternative regulators with similar pinouts and electrical specifications.