BQ27426 - Texas Instruments

BQ27426 System-Side Impedance Track Fuel Gauge

The Texas Instruments BQ27426 battery fuel gauge is a single-cell gauge that requires minimal userconfiguration and system microcontroller firmware development, leading to quick system bring-up. Three chemistry profiles are preprogrammed to enable minimum user-configuration, and to help manage customer inventory across projects with different battery chemi.

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, selfdisch.