L99UDL01 - Automotive Smart Car Door Lock Controller IC for Simplified Design

L99UDL01 Smart Car Door Lock Controller IC
L99UDL01 Smart Car Door Lock Controller IC
L99UDL01 Smart Car Door Lock Controller IC

STMicroelectronics has introduced the L99UDL01 automotive universal door-lock IC, a centralized solution for electrically driving car locks from a body control module (BCM). The device replaces multiple individual motor drivers and associated analog and passive components, it also provides more sophisticated functionality. The L99UDL01 integrates six MOSFET half-bridge outputs and two half-bridge gate drivers with protection and diagnostic functions to enhance safety, simplify design, and save space.


A unique safety feature of the IC will override normal operation during an accident to make sure that the first responders will have access to the vehicle. The PWM output-current regulation and high-level diagnostics will help in detecting over-current, open load, short to a battery, and short to ground. The load-integrity checks can be completed without actuating the load.


The six integrated MOSFET half-bridges can be connected independently or as two channels containing up to three half-bridges in parallel to share higher-current loads, the output MOSFETs have low RDS (ON) to boost energy efficiency and ease thermal management. To ensure optimal performance, including the on-time duration, off-state fault detection, and output-current magnitude and direction one can adjust the key parameters. The programmable current limit lets designers lower stress on door-lock motors to enhance reliability.


Designers can connect the two half-bridge gate drivers as per their choice as N-channel MOSFETs or Smart Power devices to control additional high powered loads. The drivers incorporate active recirculation to minimize power dissipation. Protection for external power devices is also built-in, including drain-source current monitoring and off-state fault detection.


Features of L99UDL01 Automotive Universal Door-Lock IC

  • Six integrated fully protected 0.09 Ω half-bridges
  • Very low current consumption in standby
  • 2 external half-bridge controllers
  • PWM current regulation up to 25 kHz
  • 4 MHz 24 bit SPI interface for control and diagnostics
  • Two power-saving modes including a 50µA standby and sleep mode that reduces current to below 15µA.
  • 2 stage charge pump for low voltage operation
  • High-level diagnostics
  • Output enable for high security
  • Thermal warning and shutdown protection
  • Reverse battery protection using an external N-ch MOSFET


Note: More technical information can be found in the datasheet linked at the bottom of this page and on the L99UDL01 product page.


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