TI Debuts bq27421 Li-Ion Battery Fuel Gauge Integrated Circuit

Texas Instruments (TI) bq27421 Li-Ion battery fuel gauge integrated circuit

Texas Instruments introduced the bq27421 Li-Ion battery fuel gauge integrated circuit. The TI bq27421 battery fuel gauge is available now in a 1.5mm by 1.5mm by 0.5mm, 9-ball WCSP package. It is priced at $1.20 in 1,000-unit quantities. A QFN package version is sampling to select customers, and is expected to be available in volume production in the fourth quarter.

TI bq27421 System-Side Fuel Gauge Features

  • Single Series Cell Li-Ion Battery Fuel Gauge
  • Supports Embedded or Removable Batteries
  • Powered Directly from Battery with Integrated LDO
  • Low-value Integrated Sense Resistor (7 mO Typical)
  • Easy to Configure Fuel Gauging Based on Patented Impedance Track Technology
  • Reports Remaining Capacity and State of Charge (SOC) with Smoothing Filter
  • Automatically Adjusts for Battery Aging, Self-discharge, Temperature, and Rate Changes
  • Battery State of Health (aging) Estimation
  • 400-kHz I2C serial interface
  • Configurable SOC Interrupt, or Battery Low Digital Output Warning
  • Internal Temperature Sensor, or Host Reported Temperature

The Texas Instruments bq27421 device boosts battery run-time in portable medical devices, such as wearable health monitors, and industrial devices like inventory scanners and portable emergency lights and other consumer electronics.

The new TI system-side fuel gauge in a 9-ball chipscale (WCSP) package accurately reports remaining battery capacity, state-of-charge and battery voltage. This enables portable devices to extend run-time by 50% or higher.

Designers can use the pre-configured plug-and-play bq27421 fuel gauge with TI’s new Gauge Studio software tool to simplify battery gauging design. The file size of the Gauge Studio design tool is about ten times smaller than TI’s previous software. This minimizes configuration and system firmware development. The bq27421EVM-G1A evaluation development kit is available for $49.

More info: Texas Instruments bq27421 System-Side Fuel Gauge (pdf)