SLUSDU0 September 2019 BQ21061
The BQ21061 IC integrates a linear charger that allows the battery to be charged with a programmable charge current of up to 500 mA. In addition to the charge current, other charging parameters can be programmed through I2C such as the battery regulation voltage, pre-charge current, termination current, and input current limit current.
The power path allows the system to be powered from PMID, even when the battery is dead or charging, by drawing power from IN pin. It also prioritizes the system load connected to PMID, reducing the charging current, if necessary, in order support the load when input power is limited. If the input supply is removed and the battery voltage level is above VBATUVLO, PMID will automatically and seamlessly switch to battery power.
A more detailed description of the charger functionality is presented in the following sections of this document.