Alternator regulators help maintain a stable battery voltage in the vehicle charging system by controlling the current in the alternator field winding. As engine speed and electrical loads change, the regulator continuously adjusts the alternator output to keep the battery properly charged and protect sensitive on-board electronics. ST portfolio covers multifunction alternator voltage regulators with flexible parameter settings, including reference voltage, temperature slopes, and load response control (LRC) delay times. The portfolio also supports key communication protocols for the Engine Management System (EMS ECU), such as C-Terminal, RVC, and LIN, with selected devices designed for both 12 V and 24 V systems.
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Alternator regulators help maintain a stable battery voltage in the vehicle charging system by controlling the current in the alternator field winding. As engine speed and electrical loads change, the regulator continuously adjusts the alternator output to keep the battery properly charged and protect sensitive on-board electronics. ST portfolio covers multifunction alternator voltage regulators with flexible parameter settings, including reference voltage, temperature slopes, and load response control (LRC) delay times. The portfolio also supports key communication protocols for the Engine Management System (EMS ECU), such as C-Terminal, RVC, and LIN, with selected devices designed for both 12 V and 24 V systems.
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Product type
Benefits
- Intelligent energy management: Load response control (LRC) helps prevent engine RPM drops during sudden load changes, improving driving comfort and overall system efficiency.
- High integration & robustness: Fully monolithic design including the power field driver and protections (short-circuit, overvoltage, thermal) in compact packages such as Multiwatt.
- Battery life optimization:Integrated thermal compensation adjusts the charging voltage based on ambient temperature helping protect the battery and extend service life.
- Flexible system design: Programmable parameters via OTP or NVM enable the same device to be adapted to different alternator types and battery chemistries, including lead-acid and AGM.
- Functional safety support: Devices such as the L9918 are designed for ASIL-B system readiness, helping support the latest automotive safety requirements.