BQ27531-G1 Battery Management Unit Impedance Track Fuel (Gas) Gauge for bq2419x Charger Controller |

BQ27531-G1 (ACTIVE) Battery Management Unit Impedance Track Fuel (Gas) Gauge for bq2419x Charger Controller



The Texas Instruments bq27531-G1 system-side Li- Ion Battery Management Unit is a microcontroller peripheral that provides Impedance Track fuel gauging and charging control for single-cell Li-Ion battery packs. The device requires little system microcontroller firmware development. Together with the bq2419x Single-Cell Switched-Mode Charger, the bq27531-G1 manages an embedded battery (nonremovable) or a removable battery pack.

The bq27531-G1 uses the patented Impedance Track algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-ofcharge (%), run time to empty (minimum), battery voltage (mV), temperature (°C), and state of health (%).

Battery fuel gauging with the bq27531-G1 requires only PACK+ (P+), PACK– (P–), and Thermistor (T) connections to a removable battery pack or embedded battery circuit. The CSP option is a 15-pin package in the dimensions of 2.61 mm × 1.96 mm with a 0.5-mm lead pitch, which is ideal for spaceconstrained applications.


  • Battery Fuel Gauge and Charger Controller for 1-
    Cell Li-Ion Applications
  • Resides on System Main Board
  • Battery Fuel Gauge Based on Patented
    Impedance Track™ Technology
    • Models the Battery Discharge Curve for
      Accurate Time-to-Empty Predictions
    • Automatically Adjusts for Battery Aging,
      Battery Self-Discharge, and Temperature/Rate
    • Low-Value Sense Resistor (5 mΩ to 20 mΩ)
  • Battery Charger Controller With Customizable
    Charge Profiles
    • Configurable Charge Voltage and Current
      Based on Temperature
    • Optional State of Health (SoH) and Multilevel-
      Based Charge Profiles
  • Host-Free Autonomous Battery Management
    • Reduced Software Overhead Allows for Easy
      Portability Across Platforms and Shorter OEM
      Design Cycles
    • Higher Safety and Security
  • Intelligent Charging\x97Customized and Adaptive
    Charging Profiles
    • Charger Control Based on SoH
    • Temperature Level Charging (TLC)
  • Battery Charger Controller for bq2419x Single-Cell
    Switched-Mode Battery Charger
    • Stand-Alone Charging Solution
    • SHIP Mode Capability
  • 400-kHz I2C Interface for Connection to System
    Microcontroller Port
  • In a 15-Pin NanoFree™ Packaging


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Part number Order Number of series cells Cell chemistry Battery capacity (Max) (mAh) Communication interface Battery capacity (Min) (mAh) External capacity indication Implementation Gas gauge algorithm Cell balancing Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
BQ27531-G1 Order now Single Cell     Li-Ion/Li-Polymer     8000     I2C     300     None     System     Impedance Track    
Battery Management Unit
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-40 to 85     DSBGA | 15     See datasheet (DSBGA)