The BQ27427YZFR is a single-cell Li-ion fuel gauge from Texas Instruments' Impedance Track™ series, communicating over I²C to report remaining capacity, state-of-charge, and voltage. It targets portable devices with one Li-ion cell — think wearables, IoT sensors, handheld instruments — where the gauge sits on the battery pack or the main board. The Impedance Track™ algorithm compensates for battery aging, temperature, and discharge rate, which matters when the load profile varies across a charge cycle. The gauge includes under-voltage fault protection to prevent the cell from dropping below the safe cutoff.
Package and temperature — board-fit decisions
The 9-DSBGA package (9-bump wafer-level chip-scale) is the smallest footprint for this function — roughly 1.5 mm × 1.5 mm — but it demands a controlled assembly process. Surface-mount assembly with the DSBGA package means the board must handle a 0.5 mm or finer bump pitch. Reflow profile follows JEDEC for lead-free solder; no underfill is required for most portable applications, though drop-test scenarios may call for it.
Quote-to-order lead time and pricing are confirmed at RFQ time against your quantity.