BQ27500 System-Side Impedance Track™ Fuel Gauge |

BQ27500 (NRND)

System-Side Impedance Track™ Fuel Gauge

System-Side Impedance Track™ Fuel Gauge - BQ27500

Not Recommended for New Designs (NRND)

Replaced By BQ27510-G3 – The device is an EXACT EQUIVALENT in functionality and parametrics to the compared device.

TI does not recommend using this part in a new design. This product continues to be in production to support existing customers.


The Texas Instruments bq27500/01 system-side Li-Ion battery fuel gauge is a microcontroller peripheral that provides fuel gauging for single-cell Li-Ion battery packs. The device requires little system microcontroller firmware development. The bq27500/01 resides on the system main board, and manages an embedded battery (non-removable) or a removable battery pack.

The bq27500/01 uses the patented Impedance Track™ algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), run-time to empty (min.), battery voltage (mV), and temperature (°C).

Battery fuel gauging with the bq27500 requires only PACK+ (P+), PACK– (P–), and Thermistor (T) connections to a removable battery pack or embedded battery. The bq27501 works with identification resistors in battery packs to gauge batteries of different fundamental chemistries and/or significantly different rated capacities.


  • Battery Fuel Gauge for 1-Series Li-Ion Applications
  • Resides on System Main Board
    • Works With Embedded or Removable Battery Packs
  • Two Varieties
    • bq27500: Uses PACK+, PACK–, and T Battery Terminals
    • bq27501: Works With Battery ID Resistor in Battery Pack
  • Microcontroller Peripheral Provides:
    • Accurate Battery Fuel Gauging
    • Internal Temperature Sensor for System Temperature Reporting
    • Battery Low Interrupt Warning
    • Battery Insertion Indicator
    • Battery ID Detection
    • 96 Bytes of Non-Volatile Scratch-Pad FLASH
  • 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 Inefficiencies
    • Low-Value Sense Resistor (10 m or Less)
  • I2C™ Interface for Connection to System Microcontroller Port
  • 12-Pin 2,5-mm × 4-mm SON Package
    • Smartphones
    • PDAs
    • Digital Still and Video Cameras
    • Handheld Terminals
    • MP3 or Multimedia Players

Impedance Track is a trademark of Texas Instruments.
I2C is a trademark of Philips Electronics.

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