7A single-cell Li-Ion charger with I²C control
The Texas Instruments BQ25871YFFR is a single-cell Li-Ion/Polymer battery charger delivering up to 7A constant charge current, managed through an I²C interface. It integrates over-current, over-temperature, over-voltage, and reverse-current fault protection, reducing external monitoring components on the board.
Charge current and input voltage headroom
Maximum charge current is 7A — this is the continuous constant-current ceiling for a single cell. The maximum supply voltage is 6V, so the input rail must stay below that; a 5V USB or adapter supply is typical, with headroom for cable drop. The I²C interface lets the host adjust the charge current, termination voltage, and timer settings dynamically.
Fault protection set reduces external bill
On-chip fault protection covers over-current, over-temperature, over-voltage, and reverse-current conditions. This means the design can skip a separate battery protector or current-sense resistor in many applications, saving board area and BOM cost.