Friday, May 24, 2024

Simplify Design and Boost Safety with Universal Car-Lock Controller

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  • STMicroelectronics’ latest IC comes with unique automotive safety features for normal operation in the event of an accident
  • Ensures optimal performance and enhanced flexibility

STMicroelectronics introduces the L99UDL01, an automotive universal door-lock IC that integrates six MOSFET half-bridge outputs and two half-bridge gate drivers with protection and diagnostic functions that enhances safety, simplifies design and enables more space.

As a complete centralized solution for electronically driving car locks from a body control module (BCM), the IC replaces multiple individual motor drivers and associated analogue and passive components while providing sophisticated functionalities.

Non-compromised safety

It comes with unique safety features for normal operation in the event of an accident and ensures quick access to the vehicle. Adding further value are PWM output-current regulation and high-level diagnostics capable of detecting over-current, open load, short to battery and short to ground. The load-integrity checks can be completed without actuating the load.

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Custom connectivity

The six integrated MOSFET half-bridges can be connected independently or as two channels containing up to three half-bridges in parallel for higher-current load sharing. The output MOSFETs are fully protected and have low RDS(ON) to boost energy efficiency and ease thermal management. Key parameters are adjustable to ensure optimal performance, including the on-time duration, off-state fault detection and output-current magnitude and direction. The programmable current limit offers low-stress on door-lock motors to enhance reliability.

The two half-bridge gate drivers allow designers to connect their choice of N-channel MOSFETs or Smart Power devices to control additional high-powered loads, thus enhancing flexibility. The drivers incorporate active recirculation that minimizes power dissipation. Protection for external power devices is also built-in, including drain-source current monitoring and off-state fault detection.

Also, the L99UDL01 has two power-saving modes: a 50µA standby mode ready for re-activation by an SPI command from the BCM and sleep mode that reduces current to below 15µA.

The L99UDL01 is packaged in 10mm x 10mm TQFP64L and in production now.


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