BQ27421YZFR-G1A

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 (7 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

• 9-pin 1,62 mm × 1,58 mm × 0,5 mm Pitch CSP Package

2. APPLICATIONS

• Smartphones, Feature phones and Tablets

• Digital Still and Video Cameras

• Handheld Terminals

• MP3 or Multimedia Players

3. DESCRIPTION

The Texas Instruments bq27421-G1 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 bq27421-G1 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 bq27421-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 × 1,58 mm × 0,5 mm pitch CSP package is ideal for space constrained applications.

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