bq27621-G1 System-Side Fuel Gauge With Dynamic Voltage Correlation

1 Features

• Single-Cell Li-Ion Battery Fuel Gauge
  • Resides on System Board
  • Supports Embedded or Removable Batteries
  • Powered Directly from Battery with Integrated LDO
• Easy To Configure Fuel Gauging Based on the Dynamic Voltage Correlation Algorithm
  • Reports Remaining Capacity and State of Charge (SOC) with Smoothing Filter
  • Automatically Adjusts for Self-Discharge, Temperature, and Rate Changes
• Microcontroller Peripheral Supports:
  • 400-kHz I²C Serial Interface
  • Configurable SOC Interrupt or
    Battery Low Digital Output Warning
  • Internal Temperature Sensor or
    Host Reported Temperature
• Support 4.2-V, 4.3-V, and 4.35-V Chemistries
• 9-pin 1.62 × 1.58 mm, 0.5 mm pitch YZF package

2 Applications

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

3 Description

The Texas Instruments bq27621-G1 is a minimally configured microcontroller peripheral that provides system-side fuel gauging for single-cell Li-Ion batteries. The device requires very little user configuration and system microcontroller firmware development.

The bq27621-G1 uses the Dynamic Voltage Correlation algorithm for fuel gauging. This process eliminates the need for a sense resistor when calculating remaining battery capacity (mAh), state-of-charge (%), battery voltage (mV), and temperature (°C).

Battery fuel gauging with the bq27621-G1 requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery circuit. The tiny 9-pin, 1.62 mm × 1.58 mm, 0.5 mm pitch YZF package is ideal for space-constrained applications.

1. For all available packages, see the orderable addendum at the end of the datasheet.

Simplified Schematic

4 Revision History

Changes from D Revision (December 2014) to E Revision

• Changed Pin Configurations and Functions Go
• Added Community Resources Go
• Changed Mechanical, Packaging, and Orderable Information Go

Changes from C Revision (March 2014) to D 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 section Go
• Changed Typical Application to Simplified Schematic and added 1-µF capacitorGo
• Added description for connecting 1-µF capacitor Go
• Added information for connecting GPOUT Go

Changes from B Revision (January 2014) to C Revision

• Updated BIN pin description Go
• Updated GPOUT pin description Go
• Changed recommend to requiredGo

5 Device Comparison Table