2.5A programmable charger in a 2.8 mm square
The Texas Instruments BQ24273YFFR is a single-cell, multi-chemistry battery charger IC that delivers up to 2.5A of programmable charge current. It communicates over an I²C interface, letting the host system set charge parameters on the fly rather than relying on fixed resistor dividers.
DSBGA footprint — plan the rework before you place it
This part comes in a 49-bump DSBGA package measuring 2.8 mm x 2.8 mm. That is a fine-pitch BGA with no exposed leads — you need a solder-paste stencil, a reflow oven, and ideally an X-ray to verify the joints. Not a field-swap part; it goes on the board in production and stays there. The 0.5 mm pitch bumps are standard for this class, but the board layout needs to match the TI-recommended land pattern exactly to avoid head-in-pillow defects.
Protection set covers the common failure modes
Built-in fault protection covers over-temperature, over-voltage, and short-circuit conditions. That means the charger can sit on a Li-Po or Li-ion cell without an external protection IC for basic safety — the chip handles the thermal and voltage limits itself. The battery pack voltage tops out at 4.44 V, which suits standard single-cell lithium chemistries.