L9908 is a gate driver unit (GDU) for controlling 6 N-channel FETs for brushless motors in automotive applications.
Each one of the 3 half bridge drivers channels (HS/LS couples) can be independently configured allowing different load driving and is able to withstand -14 V to 95 V excursion on motor`s pins.
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 strategy. A dedicated combination of regulators, charge pumps and bootstrap circuits allows L9908 to be suitable to operate in passenger, commercial or hybrid vehicles.
Safe operation of half bridges is ensured by shoot-through diagnosis, dead-time, short to battery, short to ground and open load detection plus a real time phase voltage monitoring.
L9908 is equipped with 3 independent high accuracy current monitor channels with SPI-configurable input differential voltage ranges for ground referenced current measurements, with 5 V/3.3 V output dynamic range compatibility.
L9908 implements diagnostics on external and internal supply, ground level, internal temperature.
A 32-bit out of frame SPI-slave interface is implemented for communication up to 10 MHz between L9908 and uC. SPI communication is safe-guarded by 5-bit CRC, 1bit frame counter, frame length check and an SPI-configurable Window Watchdog.
Full ISO26262 compliant, ASIL-D systems ready
VDH motor supply voltage range from 4.5 V to 75 V for working in single (12 V systems), double (24 V systems) and 48 V battery applications
3.3 V internal supply voltage generated from 5 V on VDD pin
Digital I/O compatible to 3.3 V/5 V logics
6 separate N-channel FET pre-drivers:
dedicated source connection to each FET
the device can withstand -14 V to 95 V on motor connection pins
0% to 100% duty cycle operation support
dedicated PWM input pin for each gate driver
3 differential high accuracy current monitors for ground referred current measurements:
SPI adjustable Gain Factor and Output Offset
built-in error calibration
the device can withstand -14 V to 6 V on input sensing pins
SPI readable current measurement
0 to 4.6 V DAC output dynamic range
3 real time phase voltage monitor channels:
SPI programmable phase voltage feedback;
SPI readable phase duty cycle measurement;
32-bit - 10 MHz SPI interface with 5-bit CRC and 1bit frame counter for internal setting, self-test and full diagnostics
Protection and diagnostic:
SPI programmable VDS diagnostic and protection in on-state
SPI programmable Dead Time protection
SPI programmable Shoot-through diagnostic and protection
Open load, short to GND and short to battery diagnostic in off-state
Over-temperature diagnostic and protection with SPI programmable warning flag
SPI readable Tj measurement
Ground loss diagnostic
System clock monitoring
Power supply pins VDD, VDH, VBP over-voltage and under-voltage diagnostic
FET driver supply VPRE and VCP under-voltage and over-voltage diagnostic