Single-cell Li-ion fuel gauge with Impedance Track™
The Impedance Track™ algorithm compensates for battery aging, temperature, and discharge rate without requiring a full learn cycle. For a procurement decision, this means the gauge maintains accuracy over the life of the pack, reducing the need for mid-life recalibration or a higher-cost gauge IC. The single-cell support (1 cell) restricts this part to 1S Li-ion configurations — not suitable for 2S or multi-cell stacks without an external balancer.
I²C interface and package constraints
Communication is over I²C. The 9-DSBGA package is surface mount only.
No NRND or last-time-buy notice is on file for this base product number (BQ27421YZFT-G1). For new designs, this part carries no imminent obsolescence risk, but as with any single-sourced TI fuel gauge, qualifying a second source early is a hedge against allocation.