What this fuel gauge does in your BOM
The BQ27545YZFT-G1 is a single-cell Li-ion battery fuel gauge from the TI Impedance Track™ series, monitoring state-of-charge and voltage via HDQ or I²C bus. It reports remaining capacity and time-to-empty to the host processor — the data you need for a low-battery warning or graceful shutdown in a portable device.
The HDQ and I²C interface lets you talk to most MCUs without a dedicated translator; just confirm the bus voltage levels match your host's I/O rail.
Package and mounting — the board-level reality
Housed in a 15-bump DSBGA (15-UFBGA), the BQ27545YZFT-G1 requires a surface-mount assembly with a fine-pitch BGA process.
The base product number BQ27545 covers this variant; the -G1 suffix denotes the specific configuration.