L5963U-KBX

Overview

The L5963U-KBX is an AEC-Q100 qualified automotive dual monolithic switching regulator featuring two step-down synchronous DC/DC converters, a low-dropout linear regulator (LDO), and a high-side driver (HSD). It supports a wide input voltage range from 3.5 V to 26 V with internal power switches capable of delivering up to 3.0 A load current per DC/DC channel. The device operates at a free-run frequency of 250 kHz, with a synchronization range from 250 kHz to 2 MHz. It includes integrated soft-start, independent hardware enable pins, and a programmable switching frequency divider. The LDO provides up to 250 mA maximum current capability.

Feature Summary

• Dual synchronous step-down regulators with internal high-side and low-side NDMOS switches
• Integrated standby linear regulator and high-side driver for flexible power management
• Synchronization input allows frequency adjustment to reduce AM/FM interference
• Comprehensive protection against short circuits, loss of ground/battery, and undervoltage

Applications

• Automotive electronic control units requiring load dump protection
• Vehicle battery connected power distribution systems
• Infotainment and instrument cluster power supplies
• ADAS sensor power management modules

Procurement Notes

Verify the specific suffix 'KBX' indicates the Tube packing type as documented in official STMicroelectronics ordering information. Confirm that the PowerSSO-36 package variant matches the thermal requirements of the target application. Ensure compliance with AEC-Q100 grade specifications for automotive deployment. Cross-reference the exact part number against the latest datasheet revision to confirm pinout and electrical characteristics remain unchanged.

Selection Notes

Select this component when designing automotive systems requiring multiple regulated outputs from a single wide-input source. The integrated HSD and LDO reduce external component count compared to discrete solutions. Consider the 250 kHz to 2 MHz synchronization range if electromagnetic interference mitigation is critical. Verify that the 3.0 A per channel current rating meets peak load demands without exceeding thermal limits in the chosen PowerSSO-36 configuration.

Part Context

The L5963 series represents STMicroelectronics' solution for complex automotive power architectures. It consolidates switching regulation, linear regulation, and high-side driving into a single monolithic IC. This integration addresses space constraints and reliability requirements in modern vehicles. The family supports various packaging options including PowerSSO-36 and VQFPN-48 to accommodate different thermal and board layout needs.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Direct replacements require matching AEC-Q100 qualification, input voltage range, and current capabilities. Evaluate alternative STMicroelectronics automotive regulators or competitors only after verifying pin compatibility and functional equivalence through official cross-reference tools.