L9908 datasheet(2/153 Pages) STMICROELECTRONICS

2 / 153 page

Application

•

EPS – Electronic Power Steering

•

HVAC Blowers – Heating, ventilation, and air conditioning

•

Engine Cooling Fans

•

Electronic Brake Booster

•

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 3

page 2/153

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