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STMicroelectronics L9918 alternator voltage regulator

The L9918 is an alternator voltage regulator equipped with the LIN protocol interface

STMicroelectronics L9918 product image

The L9918 is an alternator voltage regulator equipped with the LIN protocol interface. The device is intended to be used in automotive applications for 12 V systems. The presence of NVM cells for device parameters programmability makes it suitable for a wide range of charging applications. The device is housed into an alternator brush holder and it provides current to the excitation coil of the alternator through a high side power MOSFET driver. The device is suitable for alternators with different poles pair number. An active freewheeling circuit is also integrated into the device.


Key features

  • ​LIN Communication Protocol
  • High Side Power MOSFET Driver
  • Closed Loop Voltage Control
  • Full ISO26262 Compliant, ASIL-B Systems Ready


Additional features

The main function is to modulate the rotor current in order to keep the voltage steady to a target value (set-point). This set point target is typically commanded by the ECU and it is achieved using an internal voltage reference. Set-point is communicated along with many other functional parameters during the regular device functioning. Other features include:

  • Physical Layer compliant with LIN 2.2A specification
  • Data Link Layer compliant with LIN 1.3, 2.1, 2.2 and 2.2A specification
  • 13 sets of LIN frames selectable
  • Compliant to VDA LIN-Generator-Regulator specification


  • Automotive Applications 12 V Systems

STMicroelectronics L9918 alternator voltage regulator | EBV Elektronik

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