BQ40Z80 2-Series to 7-Series Battery Pack Manager with Impedance Track Gas Gauging |


2-Series to 7-Series Battery Pack Manager with Impedance Track Gas Gauging



The bq40z80 device, incorporating patented Impedance Track™ technology, is a fully integrated, single-chip, pack-based solution that provides a rich array of features for gas gauging, protection, and authentication for 2-series up to 7-series cell Li-Ion and Li-Polymer battery packs.

Using its integrated high-performance analog peripherals, the bq40z80 device measures and maintains an accurate record of available capacity, voltage, current, temperature, and other critical parameters in Li-Ion or Li-Polymer batteries, and reports this information to the system host controller over an SMBus v1.1 compatible interface.

Elliptic Curve Cryptography (ECC) or SHA-1 authentication with secure memory for authentication keys enables identification of genuine battery packs.

The bq40z80 device supports TURBO Mode 2.0/Intel Dynamic Battery Power Technology (DBPTv2) by providing the available max power and max current to the host system. The device has eight multifunction pins that can be configured as thermal inputs, ADC inputs, general purpose input/output (GPIO) pins, a presence pin, LED functions, display button input, or other functions. Status and flag registers are mappable to the GPIOs and used as interrupts to the host processor.

The bq40z80 device provides software-based 1st- and 2nd-level safety protection against overvoltage, undervoltage, overcurrent, short-circuit current, overload, and overtemperature conditions, as well as other pack- and cell-related faults. The compact 32-lead QFN package minimizes solution cost and size for smart batteries, while providing maximum functionality and safety for battery gauging applications.


  • Fully Integrated 2-Series to 7-Series Li-Ion or Li-Polymer Cell Battery Pack Manager and Protection
  • Next-Generation Patented Impedance Track™ Technology Accurately Measures Available Charge in Li-Ion and Li-Polymer Batteries
  • Configurable Multifunction Pins to Support a Variety of Applications
  • Supports Either Elliptic Curve Cryptography (ECC) or SHA-1 Authentication
  • High-Side N-CH Protection FET Drive
  • Integrated Cell Balancing While Charging or at Rest
  • Supports 29-Ah Batteries Natively, and Larger Capacities with Scaling
  • Full Array of Programmable Protection Features
    • Voltage
    • Current
    • Temperature
    • Charge Timeout
    • CHG/DSG FETs
    • AFE
  • Sophisticated Charge Algorithms
    • JEITA
    • Enhanced Charging
    • Adaptive Charging
    • Cell Balancing
  • Supports TURBO Mode 2.0/Intel® Dynamic Battery Power Technology (DBPTv2)
  • Diagnostic Lifetime Data Monitor and Black Box Recorder
  • LED Display
  • Supports Two-Wire SMBus v1.1 Interface
  • IATA Support
  • Compact Package: 32-Lead QFN (RSM)

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Parametrics Compare all products in Battery fuel gauges

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)
Package Group
Package size: mm2:W x L (PKG)
BQ40Z80 BQ40Z50-R2
>4 Cells     2-4 Cells
Single Cell    
29000     29000    
SMBus     SMBus    
500     100    
LED     LED    
Pack     Pack    
IT (High accuracy)
Impedance Track    
Impedance Track    
Cell Balancing
Integrated Protector
SHA-1 Authentication
Turbo Mode    
Cell Balancing
Integrated Protector
SHA-1 Authentication
Turbo Mode    
-40 to 85     -40 to 85    
VQFN | 32     VQFN | 32    
32VQFN: 16 mm2: 4 x 4 (VQFN | 32)     32VQFN: 16 mm2: 4 x 4 (VQFN | 32)