Texas Instruments bq25887 I2C Controlled Boost-Mode Battery Charger is a highly-integrated 2A boost switch-mode battery charge management device for 2-cell (2S) Li-Ion and Li-polymer battery. The bq25887 has I2C control with cell balancing, but no OTG and no power path. The bq25887 has a cell-balancing function that charges 2S battery cells from a 5V USB adapter. Unlike traditional pack-side cell-balancing, an integrated cell-balancing function enables the charger to balance the voltage of the two cells during charging within one charge cycle.
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