Design Support

Cell Balancing with the bq77PL900

The bq77PL900 five to ten series cell lithium-ion or lithium-polymer battery protection and AFE IC includes a cell-balancing function. This document describes how to use the cell-balancing feature of the part in a battery pack application. Boosting the current capability of the IC using external FETs is described. The algorithm for balancing in stand-alone mode is described as well as considerations for implementing a host-controlled balancing algorithm which avoids damage to the IC.



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