SMBus-controlled Li-Ion charger for 2-3 cell notebooks
The BQ24715RGRR is a SMBus host-controlled battery charger IC from Texas Instruments, designed for 2-3 series Li-Ion cells with a maximum supply voltage of 24V. The SMBus interface lets the system microcontroller set charge voltage and current programmatically — no external resistor dividers for the charge profile, but the host firmware must implement the SMBus protocol to drive the charger.
Cell count and input supply limits
Rated for 2 to 3 cells with a 24V supply maximum. A 4-cell Li-Ion pack (nominal ~14.8V, full charge ~16.8V) stays within the 24V input ceiling, but the BQ24715RGRR is not configured for 4-cell chemistry — the cell-count register and charge algorithm expect 2-3 series. For a 4-cell design, look at the BQ24725RGRR sibling, which supports 2-4 cells and shares the same 20-VQFN footprint.