STMicroelectronics Special Purpose Regulators L9918BDTR

The L9918BDTR is an alternator voltage regulator designed for 12 V automotive applications, featuring a LIN interface for communication with the ECU. It is AEC-Q100 qualified and supports closed loop voltage control with thermal compensation. The device includes a high side excitation driver with an internal freewheeling circuit, ensuring efficient rotor current modulation to maintain steady voltage across vehicle loads. This regulator is equipped with current limitation and overcurrent protection, as well as thermal protection features. It complies with the LIN 2.2A specification for the physical layer and is compatible with LIN 1.3, 2.1, and 2.2 data link layers. The L9918BDTR allows for configuration of parameters and supports various alternator pole pair configurations. It is available as a bare die and is suitable for integration into ASIL-B compliant systems, making it a versatile choice for automotive charging applications.