L9908 datasheet(2/152 Pages) STMICROELECTRONICS

2 / 152 page

Application

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EPS – Electronic Power Steering

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HVAC Blowers – Heating, ventilation, and air conditioning

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Engine Cooling Fans

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Electronic Brake Booster

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EWP, EFP, EOP

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.

L9908

DS13546 - Rev 5

page 2/152

L9908 数据表(PDF) 2 Page - STMicroelectronics