L9678PTR PMIC Automotive user configurable airbag IC L9678P L9678P-S L9678PTR-S battery cut-off IC

L9678P L9678P-S L9678PTR-S Automotive user configurable airbag and battery cut-off IC

Description
The L9678P IC is a system chip solution targeted for emerging market applications. Base
system designs can be completed with the L9678P, SPC560Px microcontroller and an on-
board acceleration sensor or PSI5 sensor.

Energy reserve voltage is derived through a cost effective high frequency boost regulator.
High frequency operation allows the user to pick up low value and cheap inductance. The
voltage is programmable to 23 V or 33 V nominal.

Battery voltage is sensed through the VBATMON pin providing start-up and shutdown
control for the system. Once battery voltage drops below the minimum operating voltage,
the device enables the integrated crossover switch to permit orderly shutdown.

L9678P offers two linear regulators (5 V with external pass transistor and fully integrated
3.3 V). User can use one of these regulators to supply μC. Input/output pins are compatible
with both ranges by dedicated supply pin VDDQ. External pass transistor gives the flexibility
to easily address different current loads in case of different micro-controllers.

Applications
Low end airbag systems
Cut-off battery systems
Pyro Fuse/Pyroswitch management

Pin-out description

The L9678P-S/L9678P pin-out is shown below. The package is a LQFP 64-pin full plastic package.

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