Designed to be the ST’s first gate driver unit (GDU) for automotive to support up to 48 V battery applications.
The L9908 is a gate driver unit (GDU) able to control 6 N-channel FETs for brushless motors in automotive applications up to 48 V batteries. Each one of the 3 half-bridge driver channels (HS/LS couples) can be independently configured.
Through 6 dedicated parallel inputs, the pre-driver stages can be controlled independently supporting duty cycle operations from 0% to 100% and allowing to implement all kinds of electric motor control strategies. A dedicated combination of regulators, charge pumps and bootstrap circuits makes the L9908 suitable for use in passenger, commercial, hybrid and energy-efficient vehicles.
To guarantee high-performance control of brushless motors, the L9908 is equipped with 3 independent high-accuracy current monitor channels with SPI-configurable input differential voltage ranges for ground referenced current measurements.
A 32-bit out-of-frame SPI slave interface is implemented for communication up to 10 MHz between the L9908 and the microcontroller. It allows advanced control and diagnostics of the device and enables generic software development. Moreover, the L9908 implements diagnostics on external and internal supplies, ground level, and internal temperature.