L5963DN-EHT

Overview

The L5963DN-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. It supports direct connection to vehicle batteries with a wide input voltage range of 3.5 V to 26 V. The device includes internal power switches capable of delivering up to 3.0 A per DC-DC channel and 250 mA for the LDO. Key electrical characteristics include a free-run frequency of 250 kHz, synchronization capability up to 2 MHz, and extremely low standby quiescent current of 25 μA typical.

Feature Summary

• Dual synchronous step-down regulators with independent hardware enable pins and programmable frequency dividers
• Integrated low-dropout linear regulator operating as a standby or backup source
• High-side driver with maximum 0.5 V drop at 0.5 A load
• Comprehensive protection against short circuits, loss of ground/battery, and load dump conditions

Applications

• Automotive infotainment systems requiring multi-rail power management
• Instrument clusters needing load dump protection and wide input tolerance
• Telematics units utilizing synchronized switching frequencies to reduce interference
• Body control modules demanding low standby current consumption

Procurement Notes

Verify the specific suffix DN-EHT corresponds to the PowerSSO-36 package variant when sourcing. Confirm AEC-Q100 qualification status for your specific automotive grade requirements. Ensure compatibility with the intended thermal solution, as slug-up options may be required for high-current applications. Cross-reference the exact ordering code with STMicroelectronics official documentation to avoid pinout mismatches.

Selection Notes

Select this component for designs requiring integrated power sequencing via adjustable voltage detectors and power good outputs. The 180° PWM phase shift between DC-DC channels reduces input capacitor ripple current. Consider the synchronization input if electromagnetic interference reduction in AM/FM bands is critical. The independent supply pin allows flexible biasing configurations for the control logic separate from the main power rails.

Part Context

This part belongs to the L5963 family of multi-channel power management ICs designed specifically for harsh automotive environments. It consolidates multiple power stages into a single monolithic solution, reducing board space and component count compared to discrete implementations. The family emphasizes robustness against automotive transients while maintaining high efficiency across varying load conditions.

Replacement Considerations

No officially confirmed substitute part numbers are documented in the provided source material.