BQ27426 System-Side Impedance Track™ Fuel Gauge

1 Features

Single-cell Li-ion battery fuel gauge
- Resides on system board
- Supports embedded or removable batteries
- Powers directly from the battery with integrated LDO
- Supports a low-value external sense resistor (10 mΩ)
Ultra low 9 μA operating current when the load is below 10 mA, set by Sleep Current threshold.
Battery fuel gauging based on patented Impedance Track™ technology
- Provides three selectable preprogrammed profiles for 4.2-V, 4.35-V, and 4.4-V cells
- Reports remaining capacity and state-of-charge (SOC) with smoothing filter
- Adjusts automatically for battery aging, self-discharge, temperature, and rate changes
- Estimates battery state-of-health (aging)
Microcontroller peripheral interface supports:
- 400-kHz I²C serial interface
- Configurable SOC interrupt or
  battery low digital output warning
- Internal temperature sensor or host reported temperature or external thermistor