7A single-cell charger with I²C programmability
The Texas Instruments BQ25872YFFR is a single-cell Lithium Ion/Polymer battery charger delivering a constant charge current up to 7A. That 7A ceiling puts it in the high-current tier — think tablets, power banks, and industrial handhelds that need to fill a 5000 mAh+ cell in under an hour. The I²C interface means the charge current, termination voltage, and safety timers are set in firmware, not by swapping sense resistors on the board. That saves a BOM line and lets one PCB support multiple battery chemistries with a software change.
Fault protection stack — what it catches
The protection block covers over-current, over-temperature, over-voltage, and reverse-current conditions. Over-voltage on the input rail is the one that usually kills a charger first — a 5V adapter glitching to 6.5V will latch this part off before the FET sees avalanche. Reverse-current protection matters when the battery is connected and the input is absent: the charger blocks the discharge path so the battery doesn't back-feed through the switching converter. Over-temperature shutdown at the die level keeps the part from cooking itself if the thermal pad isn't soldered properly.
Package and mounting
The 42-DSBGA package measures 2.8x2.5 mm with a 0.4 mm ball pitch. That is a fine-pitch wafer-level package — the pads are the die bumps, not a substrate interposer. The solder balls are SAC305, so the peak reflow profile tops out at 260°C. Moisture sensitivity level is not listed in this record, but a DSBGA this size typically ships at MSL 1 — bake only if the bag seal is broken and the floor life is exceeded. The thermal pad is the underside of the die; the board layout needs a via-in-pad pattern under the part to pull heat into the inner copper planes.
Supply rail and temperature range
Maximum supply voltage is 6V, so a standard 5V USB adapter or a 5V regulated rail is the design target. That covers outdoor telecom gear, portable instrumentation, and battery-backed IoT gateways.
Sourcing — active production, quoted to order
That means no last-time-buy clock running, and TI is still taking factory orders for new production. The part ships in Tape & Reel (TR) format, which is the standard for the 42-DSBGA package. We source this through independent distribution channels and quote firm pricing and lead time against an RFQ for your BOM quantity.