8A charge current, 1-cell multi-chemistry charger in 56-DSBGA
The Texas Instruments BQ25970YFFR is a single-cell, multi-chemistry battery charger IC delivering up to 8A charge current. It targets fast-charge applications in portable electronics, power tools, and compact medical devices where charge time drives the BOM. The I²C interface allows the system host to program charge voltage, current, and termination thresholds, and to read fault flags.
12V supply ceiling and 4.65V pack voltage
Maximum supply voltage is 12V, so the input rail must be regulated below that — a 5V or 9V USB-C source works directly, but a 12V adapter needs a pre-regulator or OVP clamp. The battery pack voltage tops out at 4.65V, which suits 1-cell Li-ion or Li-polymer with a 4.4V or 4.45V termination ceiling, as well as LiFePO4 cells at their 3.65V float. Over-current and over-voltage fault protection are integrated, so external protection FETs can be minimal.
56-DSBGA — fine-pitch BGA layout considerations
The 56-DSBGA package measures 3.33x2.93 mm with 0.5 mm or finer ball pitch (typical for DSBGA). This demands a 4-layer PCB minimum for fan-out, with micro-vias or via-in-pad for the inner rows. The small footprint saves board area, but the BGA reflow profile and X-ray inspection are non-negotiable for production yield.
Active production — no EOL watch needed
For production planning, this means no imminent last-time-buy risk and no forced redesign.