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.
Package and footprint — 15-DSBGA, no exposed pad to worry about
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
Listed as Active by Texas Instruments. No last-time-buy notice, no end-of-life signal. For a BOM that needs this fuel gauge, there is no urgency to stockpile or qualify a second source.