Door lock IC replaces multiple motor drivers for vehicle control
To increase safety, STMicroelectronics has introduced the L99UDL01 universal car lock controller. It integrates six MOSFET half-bridge outputs and two half-bridge gate drivers.
The IC is designed as a centralised electronic locking system from a body-control module (BCM). The L99UDL01 replaces multiple individual motor drivers and associated analogue and passive components.
The IC integrates a safety feature that over-rides normal operation in the event of an accident to help ensure that first responders will have access to the vehicle. There is also pulse width modulation (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.
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 are fully protected and have low RDS(ON) to boost energy efficiency and ease thermal management. Key parameters are adjustable to optimise performance. These include the on-time duration, off-state fault detection, and output-current magnitude and direction. The programmable current limit lets designers lower 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. The drivers incorporate active recirculation that minimises power dissipation. Built-in protection for the external power devices includes drain-source current monitoring and off-state fault detection.
The L99UDL01 has two power-saving modes including a 50 microA standby mode ready for re-activation by an SPI command from the BCM and sleep mode that reduces current to below 15 microA.
The L99UDL01 is packaged in 10 x 10mm TQFP64L and is in production now.
http://www.st.com/l99udl01