Single-cell Li-ion fuel gauge with Impedance Track™
The Texas Instruments BQ27505YZGR-J2 is a single-cell lithium-ion battery monitor that uses the Impedance Track™ algorithm to report state-of-charge. It communicates over an I²C interface, making it a drop-in for portable designs that already have a two-wire bus available. The 12-DSBGA package (0.50 mm pitch, no exposed pad) keeps the footprint under 3 mm², which suits space-constrained PCBs in handheld instruments, medical disposables, and IoT endpoints.
Temperature range and application fit
The Impedance Track™ algorithm compensates for temperature-dependent impedance shifts, so the reported capacity stays within a few percent across the range.
Sourcing and lifecycle posture
The base product number BQ27505 covers several package and tape variants; the -J2 suffix denotes the specific 12-DSBGA reel configuration.