SLUAAQ5 May 2024 BQ769142 , BQ76942 , BQ76952 , BQ76972
The BQ769x2 uses passive cell balancing. The fundamental circuit relies on an internal FET that can be enabled by the device. Once enabled, current is able to flow through the now connected VCx resistors. When charging, part of the charging current is redirected down this path while during discharge, the current comes from the cells. The excess energy is dissipated as heat from the resistors and FET. The control of balancing can either be handled by an external MCU or be allowed to run autonomously by the cell balancing algorithm of the BQ769x2. More information can be found in the application note Cell Balancing With BQ769x2 Battery Monitors.