6 MOSFET half-bridges and
Includes two half-bridge gate drivers
Reduce motor stress with current limit programming


STMicroelectronics released the L99UDL01, a universal door lock IC for automobiles, on the 8th.

The L99UDL01 integrates six MOSFET half-bridge outputs and two half-bridge gate drivers, along with integrated protection and diagnostic functions, to enhance safety, simplify design, and save space.

The L99UDL01, a centralized solution for electronically driving a vehicle's locks via a Body-Control Module (BCM), replaces multiple individual motor drivers and associated analog and passive components while providing more sophisticated functionality.

Integrated safety features that halt normal operation in the event of an accident allow first responders to access the vehicle. Additional features include PWM output current regulation and advanced diagnostics that detect overcurrent, open load, short-to-battery, and short-to-ground conditions. Furthermore, load integrity checks can be completed without activating the load.

The six integrated MOSFET half-bridges can be connected independently or configured in parallel with up to three half-bridges to share high current loads, forming two channels. The output MOSFETs are protected and have low RDS(ON) for increased energy efficiency and ease of thermal management.

Key parameters can be adjusted to ensure optimal performance, including precise duration, off-state fault detection, and output current magnitude and direction. Programmable current limiting also allows designers to reduce stress on the door lock motor.

Two half-bridge gate drivers provide designers with the flexibility to control additional high-power loads by connecting N-channel MOSFETs or Smart Power devices. These drivers feature active recirculation to minimize power consumption. They also incorporate external power device protection features, including drain-source current monitoring and off-state fault detection.

Featuring two power-saving modes – a 50µA standby mode that is reactivated by an SPI command from the BCM, and a sleep mode that reduces current to less than 15µA – the L99UDL01 is in production now in a 10mm × 10mm TQFP64L package and is priced at $3.63 in quantities of 1,000.