Single-cell fuel gauge with Impedance Track™ — no calibration needed
The BQ27520YZFR-G4 is a Texas Instruments battery monitor IC from the Impedance Track™ series, designed for single-cell Lithium Ion packs. Its core advantage is that it learns the battery's discharge curve over time, so you skip the factory calibration step that older gauges require.
Housed in a 15-bump DSBGA (0.4 mm pitch typical), the BQ27520YZFR-G4 is a true chip-scale package. No thermal pad, no exposed paddle — the die sits on the board with solder balls directly on the pads. That keeps the footprint tiny but means the board must be clean and the reflow profile tight; a misaligned stencil shorts adjacent bumps. Surface-mount only; no hand-soldering this one without a hot-air station and a steady hand.
Lifecycle and supply — active, no LTB pressure
No last-time-buy notice, no end-of-life signal.