What this charger brings to a multi-cell power path
The Texas Instruments BQ24751ARHDR is a multi-chemistry battery charger IC designed for 2 to 4 series cells, with a programmable constant-current charge profile that can deliver up to 10 A. It integrates over-current and over-voltage fault protection, so the system can shut down the charge path without relying on an external supervisor.
Charge current and pack voltage — the real BOM limits
The maximum charge current of 10 A is programmable via an external sense resistor and the ISET pin — the actual current you can sustain depends on the thermal dissipation in the 28-VFQFN package and the board's copper pour on the exposed pad. The maximum battery pack voltage is 18.04 V, which covers 4-series Li-ion (16.8 V) and 4-series LiFePO4 (14.6 V) packs with margin, but not 5-series stacks. Supply voltage can go up to 24 V, so the input can be a 19 V laptop adapter or a 24 V industrial rail without an extra pre-regulator.
Package and footprint — what the rework tech needs to know
The 28-VFQFN with exposed pad (5 mm × 5 mm) is a surface-mount package that requires a hot-air or reflow station to remove — not a field-swap part unless you carry a hot-air pencil and solder paste. Cut Tape works for prototypes or small repair runs.