bq27425-G2 System-Side Impedance Track Fuel Gauge With Integrated Sense Resistor

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
  • Low-Value Integrated Sense Resistor
    (10 mΩ, 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
• 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

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

3 Description

The Texas Instruments bq27425-G2 fuel gauge is an easy-to-configure 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 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 bq27425-G2 fuel gauge requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery circuit. The 15-pin, 2.69 mm × 1.75 mm, 0.5-mm pitch chip scale package (DSBGA) is ideal for space-constrained applications.

Simplified Schematic

4 Revision History

Changes from A Revision (February 2013) to B Revision

• Added ESD 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 sectionGo

Changes from * Revision (October 2012) to A Revision

• AVAILABLE OPTIONS table: Replaced "Contact Factory" with orderable quantities for bq27425YZFR-G2A and bq27425YZFT-G2BGo
• AVAILABLE OPTIONS table: Added CHEM_ID columnGo
• Recommended Operating Conditions: Added SHUTDOWN mode specificationsGo
• OPERATING MODES: Added text "In SHUTDOWN mode, ...."Go
• Changed Figure 6, POWER MODE DIAGRAM. Added OFF and SHUTDOWN modes to diagram.Go
• Changed the CHEM_ID subcommand section: (CHEM_ID: 0x0008)Go
• Data Block Summary: Updated Default Value column to show -G2B version differences in (Green Text)Go
• Data Block Summary: Changed Units value from Reserve Cap-mAh and Design Capacity from "mA" to "mAh"Go
• Data Block Summary: Updated several Class/Subclass descriptions to correct [RAM] vs [NVM] indication.Go

5 Device Comparison Table