What this charger IC brings to a single-cell Li-Ion BOM
The Texas Instruments BQ25600DYFFT is a 1-cell Li-Ion/Polymer battery charger IC in a 30-bump DSBGA package. It handles a constant charge current up to 3A from an input supply rated to 13.5V, which covers USB, 5V adapters, and 12V rails with margin. The I²C interface lets firmware set the charge current dynamically — useful for throttling back under thermal constraints or matching a smaller cell's C-rate. Over-voltage, over-current, and over-temperature fault protection are built in, so the BOM doesn't need a separate supervisor IC for basic safety compliance.
At 3A charge current, the input power draw at the 13.5V max supply is roughly 40W before conversion losses. That sets the thermal design constraint: the DSBGA package relies on the PCB copper for heat spreading. The constant-current profile is straightforward for a firmware engineer — write the target current to the register and monitor the fault flags.
Package and layout: 30-DSBGA
The 30-DSBGA (0.4 mm pitch typical) is a wafer-level chip-scale package. It requires a solder-paste stencil designed for the bump pattern and a reflow profile that follows the JEDEC moisture sensitivity level for the part. No exposed thermal pad — all heat sinks through the bumps into the board copper. The surface-mount assembly is standard for a pick-and-place line, but rework with a hot-air station is risky on a 0.4 mm pitch BGA; a pre-bake per MSL recommendations is mandatory if the reel has been opened past the floor-life window.
The base product number is BQ25600, so the 'DYFFT' suffix identifies the 30-DSBGA package and the tape-and-reel / cut-tape shipping options.