STMicroelectronics L9908 automotive gate driver

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STMicroelectronics’ L9908 integrated automotive three-phase gate driver unit (GDU) operates in 12, 24 or 48 V systems and has flexible input and output channels to fulfil numerous applications in conventional and hybrid/electric vehicles.

Dedicated source connections to the high-side and low-side FETs (field-effect transistors) of each half bridge let users configure the output channels independently to drive various types of loads. In addition, six separate PWM (pulse-width modulation) input pins allow independent management of the pre-driver stages for different motor-control strategies. There are three differential current monitors for ground-referenced measurements and three channels for real-time phase-voltage monitoring. There is also a rich set of diagnostic and protection features.

By combining high integration and flexibility, the product should simplify design, save space and enhance control of low-voltage fluid pumps, pumps and blowers in ventilation and cooling systems, and electronic seat controls. It can be also used in traction inverters for mild-hybrid internal combustion engine (ICE) vehicles and 48 V full-electric city cars. Moreover, its built-in diagnostics allow use in safety-related systems such as autonomous emergency braking (AEB) and advanced electronic power steering (EPS), simplifying certification according to ISO 26262.

Safety features include SPI-programmable dead-time insertion with shoot-through diagnostic and protection, open-load detection, and short-to-ground and short-to-battery diagnostics. There is also an SPI-programmable temperature warning and SPI-readable junction-temperature measurement. Other diagnostics include ground-loss detection, overvoltage and undervoltage detection on the power supply pins and FET-driver supply, system-clock monitoring, SPI window watchdog and a fault-status flag.

The flexibility to use the gate driver in 12, 24 and 48 V battery applications comes from its wide motor supply-voltage range, from 4.5 to 75 V, with the ability to tolerate -14 to +95 V on motor-connection pins. The on-chip logic is supplied from an internally generated 3.3 V supply and digital I/Os are 3.3 and 5 V-compatible. The driver is AEC-Q100 qualified and available in a thermally enhanced TQFP48 package.

For more information: https://www.st.com/en/automotive-analog-and-power/l9908.html.