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L9679P Datasheet(PDF) 46 Page - STMicroelectronics

Part # L9679P
Description  Automotive advanced airbag IC for mid/high end applications
PDF  272 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9679P Datasheet(HTML) 46 Page - STMicroelectronics

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Start-up and power control
L9679P
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DocID029275 Rev 1
In case of loss of ground the FET is not turned on. Loss of ground can be detected also
when the FET is off thanks to a pull-up current present on the BSTGND pin. The FET will be
automatically reactivated as soon as ground connection is restored. Over-voltage protection
from load dump and inductive flyback is provided via an active clamp and a SYNC_Boost
disable circuitry, see Figure 20.
Figure 20. SYNCBOOST regulator block diagram
Figure 21. SYNCBOOST regulator state diagram



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