Advanced notebook battery fuel gauges

Texas Instruments has introduced the bq20z4x and bq20z6x family of battery fuel gauge integrated circuits (ICs) with enhanced charging, including the Japan Electronics and Information Technology Association (JEITA) profile. The new battery fuel gauges feature TIs Impedance Track technology and provide the highest degree of capacity measurement for two- to four-cell battery packs used in next-generation notebooks and netbooks, portable industrial and medical equipment.

The bq20z4x and bq20z6x devices are pin-compatible with TIs popular bq20z7x and bq20z9x series of products with Impedance Track. The bq20z45 and bq20z65 are single-package ICs with integrated battery protection, while the bq20z40 and bq20z60 are dual-package ICs requiring a companion bq29330 analog front end device. The bq20z6x family supports LED functionality.

Full configurability of all JEITA parameters:
Configurable according to temperature, charging currents and charging voltages
Charging voltage and cell over-voltage threshold varies with temperature
Charging current can be adjusted based on battery voltage and temperature

Additional features and benefits of bq20z4x and bq20z6x
Third-generation fuel gauges with patented Impedance Track provide accurate runtime prediction for batteries with extremely flat voltage profiles.
Cell voltage-based taper termination improves charge termination accuracy.
Provides enhanced cell imbalance detection in charge mode.
Two independent thermistor controls enable simultaneous monitoring of battery temperature and MOSFETs.
Access to lifetime data simplifies diagnostics.

The bq20z45 and bq20z65 single-chip fuel gauges come in a 38-pin TSSOP with a suggested resale price of $4.40 in 1,000-unit quantities. The bq20z40 and bq20z60 come in a 20-pin TSSOP and have a suggested resale price of $3.40 in 1,000-unit quantities. The bq29330 is available in a 30-pin TSSOP with a price of $1.00 in 1,000-unit quantities.