Automotive 3-phase motor gate driver unit

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Product overview

Description

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.

  • All features

    • AEC-Q100 qualified
    • 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:
      • ADC/DAC architecture
      • 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
      • SPI Window Watchdog
      • Fault status flag output

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STMicroelectronics - L9908

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L9908
Active
TQFP 48 7x7x1.0 Automotive Safety Ecopack2
L9908TR
Active
TQFP 48 7x7x1.0 Automotive Safety Ecopack2

L9908

Package:

TQFP 48 7x7x1.0

Material Declaration**:

PDF XML

Marketing Status

Active

Package

TQFP 48 7x7x1.0

Grade

Automotive Safety

RoHS Compliance Grade

Ecopack2

L9908TR

Package:

TQFP 48 7x7x1.0

Material Declaration**:

PDF XML

Marketing Status

Active

Package

TQFP 48 7x7x1.0

Grade

Automotive Safety

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors