Pack-Side Impedance Track(tm) Fuel (Gas) Gauge with Integrated Protector - BQ27741-G1

BQ27741-G1 (ACTIVE)

Pack-Side Impedance Track(tm) Fuel (Gas) Gauge with Integrated Protector


The Texas Instruments bq27741-G1 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 for accurate battery fuel gauging. The fuel gauge resides within the battery pack or on the system’s main board with an embedded battery (non-removable). The fuel gauge provides hardware-based over- and undervoltage, overcurrent in charge or discharge, and short-circuit protections.

The fuel gauge 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 (minimum), battery voltage (mV), and temperature (°C), as well as recording vital parameters throughout the lifetime of the battery.

The CSP is a 15-ball package (2.776 mm × 1.96 mm) that is ideal for space-constrained applications.


  • Battery Fuel Gauge and Protector for 1-Series Li-Ion
  • Microcontroller Peripheral Provides:
    • Accurate Battery Fuel Gauging Supports up to 32 Ahr
    • External and Internal Temperature Sensors for Battery
      Temperature Reporting
    • Precision 16-bit High-Side Coulomb Counter with
      High-Side Low-Value Sense Resistor (5 mΩ to 20 mΩ)
    • Lifetime and Current Data Logging
    • 64 Bytes of Non-Volatile Scratch Pad Flash
    • SHA-1/HMAC Authentication
  • Battery Fuel Gauging Based on Patented Impedance
    Track Technology
    • Models Battery Discharge Curve for Accurate
      Time-To-Empty Predictions
    • Automatically Adjusts for Aging, Self-Discharge, and
      Temperature- and Rate-Induced Effects on Battery
  • Advanced Fuel Gauging Features
    • Internal Short Detection
    • Tab Disconnection Detection
  • Safety and Protection:
    • Over- and Undervoltage Protection with Brown-out
      Low-Power Mode
    • Overcharging and Discharging Current Protection
    • Overtemperature Protection
    • Short-Circuit Protection
    • Low-Voltage Notification
    • Voltage Doubler to Support High-side NFET Protection
  • HDQ and I2C Interface Formats for Communication
    With Host System
  • Small 15-ball NanoFree (CSP) Packaging

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Parametrics Compare all products in Battery Fuel Gauge

# Series Cells
Cell Chemistry
Battery Capacity (Max) (mAh)
Communication Interface
Battery Capacity (Min) (mAh)
External Capacity Indication
Gas Gauge Algorithm
Special Features
Operating Temperature Range (C)
Approx. Price (US$)
Single Cell    
Impedance Track    
SHA-1 Authentication    
-40 to 85    
1.45 | 1ku    
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