4 A charge current in a 2.8 x 2.5 mm DSBGA — the thermal layout call
The BQ25898DYFFR is a single-cell Li-Ion/Polymer charger from the MaxCharge™ series, rated for a 4 A maximum charge current and a 14 V maximum supply voltage. That charge current in a 42-DSBGA (2.8 x 2.5 mm) package means the PCB copper area under the package — the thermal pad and its via array — sets the real current ceiling, not the silicon alone. The I²C and USB interface gives the host control over the charge profile, termination current, and safety timers.
14 V input — no external pre-regulator for USB PD or 12 V adapters
The 14 V supply maximum covers USB Power Delivery and common 12 V wall adapters without a front-end buck or LDO. That saves two or three passives and a regulator IC from the BOM. The I²C interface lets the system negotiate the input current limit dynamically — a 500 mA USB 2.0 port and a 3 A USB-C charger both work with the same hardware, just different register settings.
Industrial temp range and fault protection
On-chip fault protection covers over-current and over-temperature, which reduces the external sense and cutoff components the board would otherwise need.
Texas Instruments lists the BQ25898DYFFR as Active. For a new-design BOM line, this removes the single-source obsolescence risk that often forces a late-stage charger swap.