STMicroelectronics L9908 Automotive 3-Phase Motor Gate Driver Units

STMicroelectronics L9908 Automotive 3-Phase Motor Gate Driver Units (GDU) are designed for controlling 6 N-channel FETs for brushless motors in automotive applications. The three half-bridge driver channels (HS/LS couples) independently configure different load driving and withstand -14V to +95V excursion on motor pins. The pre-driver stages are controlled through 6 dedicated parallel inputs to support duty cycle operations from 0% to 100%. This feature also allows the implementation of all kinds of electric motor control strategies.

The integrated combination of regulators, charge pumps, and bootstrap circuits enables the L9908 to operate in passenger, commercial, or hybrid vehicles. The safe operation of half-bridges is ensured by shoot-through diagnosis, dead-time, short to battery, short to ground, and open load detection, in addition to real-time phase voltage monitoring.

The STM L9908 Automotive 3-Phase Motor GDUs feature three independent high accuracy current monitor channels with SPI-configurable input differential voltage ranges utilized for ground-referenced current measurements. This includes a 5V/3.3V output dynamic range compatibility. The L9908 employs external and internal supply, ground level, and internal temperature diagnostics.

A 32-bit out-of-frame SPI-slave interface is enforced for communication up to 10MHz between L9908 and uC. SPI communication is safeguarded by 5-bit CRC, 1bit frame counter, frame length check, and an SPI-configurable window watchdog.

Features

AEC-Q100 qualified
Full ISO26262 compliant, ASIL-D systems ready
VDH motor supply voltage range from 4.5V to 75.0V for working in single (12V systems), double (24V systems), and 48V battery applications
3.3V internal supply voltage generated from 5V on VDD pin
Digital I/O compatible to 3.3V/5.0V logics
6 separate N-channel FET pre-drivers:
- Dedicated source connection to each FET
- The device can withstand -14V to +95V 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:
- ADC/DAC architecture
- SPI adjustable Gain Factor and Output Offset
- Built-in error calibration
- The device can withstand -14V to +6V on input sensing pins
- SPI readable current measurement
- 0 to 4.6V DAC output dynamic range
32-bit 10MHz SPI interface with 5-bit CRC and 1bit frame counter for internal setting, self-test, and full diagnostics

3 real-time phase voltage monitor channels:
- SPI programmable phase voltage feedback
- SPI readable phase duty cycle measurement
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
- SPI Window Watchdog
- Fault status flag output

Applications

EPS – electronic power steering
HVAC Blowers – heating, ventilation, and air conditioning

Engine cooling fans
Electronic brake booster
EWP, EFP, EOP

STMicroelectronics L9908 Automotive 3-Phase Motor Gate Driver Units

Features

Applications

Block Diagram

husseinkey ELECTRONICS®

COMPANY