The MC33771B from NXP Semiconductors is an Automotive Qualified Lithium-ion Battery Cell Controller IC. This controller IC has an input voltage of 9.6 V to 61.6 V and a charge current of up to 8 mA. It is designed to manage up to 14 cells and can conduct operations such as ADC conversions of differential cell voltages and currents, battery coulomb counting, and battery temperature measurements. This BMIC supports an SPI interface, and transform isolation (TPL) topology to digitally transmit the information to the connected device. It also consists of seven GPIO/temperature sensor inputs, and onboard passive cell balancing with a diagnostic feature.

This AEC-Q100 qualified controller IC can detect internal and external faults such as open lines, shorts, and leakages and offers over/under-voltage and temperature detection to protect the device against short-circuit-related damages. It is designed to support ASIL-D safety system standards. This BMIC is available in a surface-mount package that measures 12 x 12 mm and is ideal for automotive applications such as 48 V and high voltage battery packs, e-bikes, e-scooters, energy storage systems, and UPS.