The BQ24730RGFRG4 is a multi-chemistry battery charger controller from Texas Instruments that handles 3 to 4 series cells with a maximum supply voltage of 24V. That 24V input ceiling means you can run it off a common 19V notebook adapter or a 24V industrial supply, but not a 48V telecom rail — anything above 24V needs a pre-regulator or a different charger IC. The multi-chemistry support lets the same BOM handle Li-ion, Li-Pol, or NiMH packs by adjusting the charge algorithm, which simplifies inventory if your product ships with different battery types.
Fault protection and programmable current — bench-level reliability
Integrated over-current and reverse-battery protection means the charger can survive a pack plugged in backwards or a shorted cell without letting the magic smoke out. On the repair bench, that translates to fewer blown upstream FETs and a board that comes back alive after a battery swap. The charge current is constant and programmable, so you set the rate with a resistor or firmware — no external current-sense amp needed.
Industrial temperature grade and active lifecycle
It is not AEC-Q100 qualified, so skip it for under-hood automotive. That removes the single-source risk for a production BOM, though as with any active IC, availability and pricing fluctuate — confirmed at quote time.