Single Cell Impedance Track Pack Side Fuel Gauge - BQ27546-G1

BQ27546-G1 (ACTIVE)

Single Cell Impedance Track Pack Side Fuel Gauge



The bq27546-G1 Li-Ion battery fuel gauge is a microcontroller peripheral that provides fuel gauging for single-cell Li-Ion battery packs. The device requires minimal system microcontroller firmware development for accurate battery fuel gauging. The bq27546-G1 resides within the battery pack or on the system’s main-board with an embedded battery (non-removable).

The bq27546-G1 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). It also provides detections for internal short or tab disconnection events.

The bq27546-G1 features integrated support for secure battery pack authentication, using the SHA-1/HMAC authentication algorithm.

The device comes in a 15-ball Nano-Free™ DSBGA package (2.61 mm × 1.96 mm) that is ideal for space-constrained applications.


  • Battery Fuel Gauge for 1-Series (1sXp) Li-Ion
    Applications up to 14,500-mAh Capacity
  • Microcontroller Peripheral Provides:
    • Internal or External Temperature Sensor for
      Battery Temperature Reporting
    • SHA-1/HMAC Authentication
    • Lifetime Data Logging
    • 64 Bytes of Non-Volatile Scratch Pad FLASH
  • Battery Fuel Gauging Based on Patented
    Impedance Track™ Technology
    • Models 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)
  • Advanced Fuel Gauging Features
    • Internal Short Detection
    • Tab Disconnection Detection
  • HDQ and I2C™ Interface Formats for
    Communication with Host System
  • Small 15-Ball Nano-Free™ (DSBGA) Packaging

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Parametrics Compare all products in Battery Fuel Gauge

Number of Series Cells
Cell Chemistry
Battery Capacity (Max) (mAh)
Communication Interface
Battery Capacity (Min) (mAh)
External Capacity Indication
Gas Gauge Algorithm
Cell Balancing
Operating Temperature Range (C)
BQ27546-G1 BQ27320 BQ27520-G4 BQ27542-G1
Single Cell    Single Cell    Single Cell    Single Cell   
Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer   
14600    29000    32000    14600   
I2C    I2C    HDQ
100    100    300    100   
None    None    None    None   
System    Pack
System    Pack   
IT (High accuracy)    CEDV    IT (High accuracy)    IT (High accuracy)   
N/A    N/A    N/A    N/A   
SHA-1 Authentication
Turbo Mode   
N/A    N/A    SHA-1 Authentication
Turbo Mode   
-40 to 85    -40 to 85    -40 to 85    -40 to 85   
15DSBGA    15DSBGA    15DSBGA    12SON