L5963D-EHT

Overview

The L5963D-EHT is an automotive-grade dual monolithic switching regulator featuring two synchronous step-down 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, allowing direct connection to vehicle batteries. The device includes internal power switches capable of delivering up to 3.0 A load current per DC-DC converter with a minimum output of 1 V. It operates at a free-run frequency of 250 kHz and allows synchronization between 250 kHz and 2 MHz to reduce electromagnetic interference. The LDO provides up to 250 mA for standby or backup functions.

Feature Summary

• AEC-Q100 qualified for automotive reliability standards
• Dual independent DC-DC regulators with integrated soft-start and programmable frequency dividers
• Extremely low quiescent current in standby conditions
• Comprehensive protection against short circuits, loss of ground/battery, and unsupplied states

Applications

• Automotive electronic control units requiring load dump protection
• Systems needing wide input voltage tolerance directly connected to vehicle batteries
• Applications requiring synchronized switching frequencies to minimize AM/FM radio interference
• Power architectures utilizing separate standby and active regulation domains

Procurement Notes

Verify the specific suffix 'EHT' corresponds to the required tape-and-reel packaging configuration as defined in the official datasheet. Confirm that the component meets the AEC-Q100 qualification requirements for your target automotive application tier. Ensure compatibility with the PowerSSO-36 package thermal characteristics if heatsinking is not utilized.

Selection Notes

Select this component when designing automotive systems that require dual isolated buck converters alongside a dedicated linear regulator for low-noise or standby rails. The device is suitable for applications demanding high efficiency under varying battery loads and strict electromagnetic compatibility constraints through external clock synchronization capabilities.

Part Context

This part belongs to STMicroelectronics' L5963 family of dual monolithic switching regulators designed specifically for harsh automotive environments. The family integrates multiple power stages into a single chip to reduce board space and component count while providing robust protection features essential for vehicle electrical systems.

Replacement Considerations

Public documentation does not list confirmed substitute part numbers for the L5963D-EHT. Engineers should consult official cross-reference guides or contact the manufacturer for validated alternatives.