L9951| Datasheet

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L9951
DOOR ACTUATOR DRIVER
DATA BRIEF

1

FEATURES One half bridge for 7.4A load (ron = 150m) Two half bridges for 5A load (ron = 200m) Two highside drivers for 1.25A load (ron = 800 m) Programmable Softstart function to drive loads with higher inrush currents (i.e.current >7.4A, >5A, >1.25A) Very low current consumption in standby mode (IS < 3uA, typ. Tj 85 C) All outputs short circuit protected Current monitor output for all highside drivers All outputs over temperature protected Open load diagnostic for all outputs Overload diagnostic for all outputs Programmable PWM control of all outputs Charge Pump output for reverse polarity protection APPLICATION Rear Door Actuator Driver with bridges for door lock and safe lock and two 5W or 10W-light bulbs.

PowerSO36

Table 1. Order Codes
Part Number L9951 Package PowerSO36

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3 DESCRIPTION The L9951 is a microcontroller driven multifunctional rear door actuator driver for automotive applications. Up to two DC motors and two grounded resistive loads can be driven with three half bridges and two highside drivers. The integrated standard serial peripheral interface (SPI) controls all operation modes (forward, reverse, brake and high impedance). All diagnostic informations are available via SPI.

BLOCK DIAGRAM
VBAT
10k 100k

VCC

Reverse Polarity Protection

VS
Note: value of capacitor has to be choosen carefully to limit the VS voltage below absolute maximum ratings in case of an unexpected freewheeling condition (e.g. TSD, POR)

CP

MUX

CM/PWM PWM EN DI

OUT1 Lock OUT2 OUT3

Driver Interface & Diagnostic

M M
Safe Lock

uC

DO CLK CSN

SPI

OUT4 OUT5

Exteriour Light Safety Light

GND

April 2004
This is preliminary information on a new product now in development. Details are subject to change without notice.

REV. 2 1/4

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L9951 DATASHEET