8.064 A charge current — sizing the power stage
The BQ24745RHDRG4 is a multi-chemistry battery charger IC from Texas Instruments that handles 2 to 4 series cells with a programmable constant-current charge up to 8.064 A. That 8.064 A ceiling sets the inductor and FET selection — the power stage must be rated for continuous current above that level with margin for the charge profile. The I²C interface lets the host controller set the charge current, voltage thresholds, and input current limit without external resistor dividers.
Maximum supply voltage is 24 V, which covers standard notebook adapters (19 V to 20 V) and USB PD inputs at 20 V with headroom for transients.
Housed in a 28-VFQFN with exposed pad (5x5 mm body), this is a standard QFN package. Rework is straightforward with hot air — the 5 mm body is small enough that the pad reflows evenly, and the corner pin-1 chamfer is visible under magnification. No hidden thermal balls or oddball pad geometry; it behaves like any other 5x5 QFN under the iron.
For dual-source planning, the closest functional sibling is the BQ24745RHDT (same die, different tape-and-reel suffix), but pin compatibility should be confirmed against the specific package code.