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Texas Instruments BQ27532-G1

BQ27532-G1 - Battery Management Unit Impedance Track Fuel Gauge for BQ2425x Charger

The BQ27532-G1 system side, Li Ion battery management unit is a micro controller peripheral that provides Impedance Track fuel gauging and charging control for single cell Li Ion battery packs.

The fuel gauge requires little system micro controller firmware development. Together with bq2425x single cell switch mode charger, the fuel gauge manages an embedded battery (non removable) or a removable battery pack.

The fuel gauge uses the patented Impedance Track algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state of charge (%), runtime to empty (minimum), battery voltage (mV), temperature (°C), and SoH (%). Battery fuel gauging with the device requires only PACK+ (P+), PACK– (P–), and thermistor (T) connections to a removable battery pack or embedded battery circuit. The 15 pin Nano-Free (CSP) package has dimensions of 2.61 mm × 1.96 mm with 0.5 mm lead pitch. It is ideal for space constrained applications.

Key Features

  • Battery Fuel Gauge and Charger Controller for 1-Series Li-Ion Applications up to 14,500-mAh Capacity
  • Resides on System Main Board
  • Battery Fuel Gauge Based on Patented Impedance Track™ Technology
    • Models the Battery Discharge Curve for Accurate Remaining Capacity Predictions
    • Automatically Adjusts for Battery Aging, Battery Self-Discharge, and Temperature and Rate Inefficiencies
    • Low-value Sense Resistor (5 to 20 mΩ)
  • Battery Charger Controller With Customizable Charge Profiles
    • Configurable Charge Voltage and Current Based on Temperature
    • Optional State of Health (SoH) and Multi-level Based Charge Profiles
  • Host-free Autonomous Battery Management System
  • Runtime Improvements
  • Intelligent Charging – Customized and Adaptive Charging Profiles
  • Stand-alone Battery Charger Controller for bq2425x Single Cell Switch-mode Battery Charger
  • 400-kHz I2C Interface for Connection to System Micro controller Port


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

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