L4964

Voltage Regulators - DC DC Switching Regulators Overview

The L4964 is a step-down power switching regulator delivering 4A output current with an adjustable voltage range from 5.1V to 28V. It operates at switching frequencies up to 120kHz, achieving efficiency up to 90%. Key electrical specifications include a precise on-chip reference with ±3% accuracy and a 0 to 100% duty cycle range. The device integrates overload protection, thermal shutdown, soft start, and a reset output for microprocessors.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates overload protection, soft start, and thermal shutdown for robust operation
• Provides a dedicated reset output signal compatible with microprocessor systems
• Supports remote inhibit control and PWM comparator input for synchronization in multichip configurations
• Requires very few external components due to high integration

Voltage Regulators - DC DC Switching Regulators Applications

• Microprocessor system power supplies requiring reset signals
• Multichip configurations requiring synchronized switching
• General-purpose step-down DC-DC conversion applications

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the obsolete status of this component before design finalization. Confirm availability through authorized distributors or secondary markets. Ensure that any substitute parts maintain compatibility with the required 4A current rating and 28V maximum input voltage. Check package integrity for the 15-lead Multiwatt plastic power package upon receipt.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this regulator for applications needing high current capability with minimal external component count. The integrated reset output simplifies microprocessor power sequencing. Consider the 120kHz switching frequency when designing filter components to balance size and cost. Verify that the load requirements do not exceed the 4A continuous output limit.

Voltage Regulators - DC DC Switching Regulators Part Context

The L4964 belongs to STMicroelectronics' family of high-current switching regulators. It is designed for efficient power conversion in compact spaces. The device utilizes a 15-lead Multiwatt plastic power package to handle thermal dissipation effectively. It targets designs where board space and component count are critical constraints.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Due to the obsolete status, alternative solutions must be evaluated based on pin compatibility and electrical specifications.