BQ24610: CV time period

Hi Fariz,

   It is hard to estimate the actual time the CV portion of the charging phase takes, as it depends on a variety of factors such as battery impedance, termination current setting (en/dis and actual value), battery chemistry etc. This is why only speed of fast charge (CC) time is specified, for example 0 to 50% in 30 minutes. In constant voltage, the voltage of the battery is regulated, and charge current is allowed to gradually taper down, until termination current threshold is hit.

   For actual time of CV, user will have to evaluate with their specific settings and batteries, and again this time will increase as batteries grow older.

Hi Fariz,

   The key difference between CC and CV is that during CC the charger will regulate the charge current and allow battery voltage to rise, and CV the charger will regulate the output (battery voltage) and allow current to taper down. This is why it is hard to estimate CV time, as current is not regulated at all. This is the idea behind CC-CV charging. BQ24610 will not regulate the CV time in any way (chargers will not regulate CV time), but just the voltage. Here the factors I mentioned above will come into play. During CV stage, battery voltage will be regulated at your resistor set charge regulation voltage, and current will taper down from 2.6A till it hits 200mA, at which stage BQ24610 will terminate charge.