bq27441-G1 System-Side Impedance Track Fuel Gauge

1 Features

• Single Series Cell Li-Ion Battery Fuel Gauge
  • Resides on System Board
  • Supports Embedded or Removable Batteries
  • Powered Directly from Battery with Integrated LDO
  • Supports a Low-Value External Sense Resistor (10 mΩ)
• Battery 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
• Microcontroller Peripheral Supports:
  • 400-kHz I²C Serial Interface
  • Configurable SOC Interrupt or
    Battery Low Digital Output Warning
  • Internal Temperature Sensor or
    Host-Reported Temperature

2 Applications

• Smartphones, Feature Phones, and Tablets
• Digital Still and Video Cameras
• Handheld Terminals
• MP3 or Multimedia Players

3 Description

The Texas Instruments bq27441-G1 fuel gauge is a microcontroller peripheral that provides system-side fuel gauging for single-cell Li-Ion batteries. The device requires minimal user configuration and system microcontroller firmware development.

The bq27441-G1 battery fuel gauge uses the patented Impedance Track™ algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), and battery voltage (mV).

Battery fuel gauging with the bq27441-G1 fuel gauge requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery circuit. The tiny, 12-pin, 2.50 mm × 4.00 mm, small outline no-lead (SON) package is ideal for space-constrained applications.

4 Simplified Schematic

5 Revision History

Changes from B Revision (August 2014) to C Revision

• Changed simplified schematic by adding two 1 µF capacitors Go
• Added description for connecting 1-µF capacitor Go
• Added information for connecting GPOUT Go
• Changed Handling Ratings to ESD RatingsGo
• Changed connection description for BAT pin Go
• Changed recommend to requiredGo
• Added arrow to C _BAT from textGo

Changes from A Revision (January 2014) to B Revision

• Added Handling Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go
• Changed LiMnO₄ to LiCoO₂Go
• Updated BAT pin description Go
• Updated BIN pin description Go
• Updated GPOUT pin description Go
• Updated SRN and SRP pin descriptionsGo
• Changed the I_lkg parameters Go

Changes from * Revision (November 2013) to A Revision

• Changed the device status from Product Preview to Production DataGo

6 Device Comparison Table