Infineon TLE9012AQU sensing and balancing IC
Suitable for batteries divided into 12 cells per module


Battery management systems play a vital role in improving battery performance and extending its lifespan.

Infineon Technologies announced on the 26th that it is launching the sensing and balancing IC 'TLE9012AQU' for battery management systems (BMS) in electric vehicles.

The TLE9012AQU is designed for electric vehicle batteries, measuring the voltage of up to 12 battery cells with an accuracy of ±5.8 mV across the entire temperature, voltage, and operating life. It supports up to five external temperature sensors, integrates cell balancing, and uses an iso-UART interface for inter-module and module-to-MCU communication.

Infineon's sensing and balancing ICs incorporate programmable noise filters to minimize interference from other signals in the measurement results. Simultaneous measurement of all cells ensures stable sensing even in the presence of transient interference. A compensation algorithm with built-in stress sensors and extended temperature compensation ensures long-term measurement stability.

Cell balancing is achieved using 12 balancing switches (one per channel) integrated on-chip. Designed to handle currents up to 150 mA, an external switch can be used for higher balancing currents. Cell balancing can be programmed to stop after a specified period of time (up to 32 hours) without a signal from the MCU, or when the cells reach a specified voltage.

The TLE9012AQU supports 12 channels, making it suitable for batteries divided into 12 cells per module. This requires one device per module. The iso-UART interface ensures easy voltage isolation and data integrity. This communication supports more than 20 serially connected devices and a ring topology. Therefore, even if a single device fails, the communication chain is not interrupted, and the rest of the system continues to operate.

Infineon offers the iso-UART transceiver TLE9015QU alongside the TLE9012AQU, with availability starting in July.