L5964L-VYY

Overview

The L5964L-VYY is an automotive-grade monolithic dual step-down switching regulator with an integrated low-dropout (LDO) linear regulator. It features two independent DC-DC converters capable of delivering up to 3.5 A load current, with selectable current limits of 2 A or 4.5 A. The device supports a wide input voltage range from 3.5 V to 26 V and offers free-run frequencies of 270 kHz or 2.2 MHz, or synchronization to an external clock. The LDO provides fixed current limitation and power good signaling. Designed for passenger car applications, it includes load dump protection, thermal shutdown, and configurable reset outputs.

Feature Summary

• Dual synchronous step-down switching regulators with internal high-side and low-side NDMOS switches
• Integrated low-dropout linear regulator functioning as a standby or normal LDO
• External synchronization capability to reduce AM/FM interference and allow smaller passive components
• Automotive qualification including load dump protection and wide input voltage tolerance

Applications

• Microcontroller supply management in automotive systems
• Power distribution in passenger car electronic control units
• Infotainment and telematics system power rails
• Load dump protected power architectures

Procurement Notes

Verify the specific suffix 'VYY' against the official STMicroelectronics datasheet to confirm package type and temperature grade. Confirm end-of-life status, as related L5964 variants may be marked as Not Recommended for New Designs. Ensure compatibility with required automotive reliability standards before finalizing procurement.

Selection Notes

Select this component when designing automotive power trains requiring dual isolated DC-DC rails and a dedicated LDO. The choice depends on the need for external synchronization to minimize electromagnetic interference in sensitive radio environments. Verify that the required output current does not exceed the 3.5 A per channel limit without appropriate thermal management and external Schottky diodes.

Part Context

The L5964 series belongs to STMicroelectronics' automotive power management portfolio, specifically designed for robust vehicle electrical systems. It integrates multiple regulation functions into a single chip to reduce board space and component count. The device is qualified for harsh automotive environments, ensuring reliability under varying battery voltages and thermal conditions typical in modern vehicles.

Replacement Considerations

Check for direct pin-compatible substitutes within the L596x family, such as the L5963 or L5962, depending on whether the application requires the specific 3.5 A rating or different feature sets like I2C control. Verify that any replacement maintains the same automotive qualification level and package dimensions.