9 to 15-Series Cell Li-Ion and Li-Phosphate Battery Monitor (bq76940 Family) - BQ76940

BQ76940 (ACTIVE)

9 to 15-Series Cell Li-Ion and Li-Phosphate Battery Monitor (bq76940 Family)

Description

The bq769x0 family of robust analog front-end (AFE) devices serves as part of a complete pack monitoring and protection solution for next-generation, high-power systems, such as light electric vehicles, power tools, and uninterruptible power supplies. The bq769x0 is designed with low power in mind: Sub-blocks within the IC may be enabled/disabled to control the overall chip current consumption, and a SHIP mode provides a simple way to put the pack into an ultra-low power state.

Features

  • AFE Monitoring Features
    • Pure digital interface
    • Internal ADC measures cell voltage, die
      temperature, and external thermistor
    • A separate, internal ADC measures pack
      current (coulomb counter)
    • Directly supports up to three thermistors (103AT)
  • Hardware Protection Features
    • Overcurrent in discharge (OCD)
    • Short circuit in discharge (SCD)
    • Overvoltage (OV)
    • Undervoltage (UV)
    • Secondary protector fault detection
  • Additional Features
    • Integrated cell balancing FETs
    • Charge, discharge low-side NCH FET drivers
    • Alert interrupt to host microcontroller
    • 2.5-V or 3.3-V output voltage regulator
    • No EEPROM programming necessary
    • High supply voltage abs max (up to 108 V)
    • Simple I2C compatible interface (CRC option)
    • Random cell connection tolerant

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Parametrics Compare all products in Battery Monitor, Protection & Authentication Solutions

 
Function
# Series Cells (Min)
# Series Cells (Max)
Battery Over-Voltage Protection (Typ) (V)
Communication Interface
Protection Feature(s)
Special Features
Typical Operating Current (Typ) (uA)
Vin (Max) (V)
Rating
Pin/Package
BQ76940 BQ76920 BQ76930
Monitoring (Analog Front-End)     Monitoring (Analog Front-End)     Monitoring (Analog Front-End)    
9     3     6    
15     5     10    
4.6     4.6     4.6    
I2C     I2C     I2C    
Over-current (OCP)
Over-voltage (OV)
Short-circuit Discharge (SCD)
Under-voltage (UV)    
Over-current (OCP)
Over-voltage (OV)
Short-circuit Discharge (SCD)
Under-voltage (UV)    
Over-current (OCP)
Over-voltage (OV)
Short-circuit Discharge (SCD)
Under-voltage (UV)    
Cell Balancing
Coulomb counter (integrating current sense)
Integrated ADC
LDO
Low-Side NCH CHG/DSG FET Drive
Requires separate MCU
Temperature sense    
Cell Balancing
Coulomb counter (integrating current sense)
Integrated ADC
LDO
Low-Side NCH CHG/DSG FET Drive
Requires separate MCU
Temperature sense    
Cell Balancing
Coulomb counter (integrating current sense)
Integrated ADC
LDO
Low-Side NCH CHG/DSG FET Drive
Requires separate MCU
Temperature sense    
40     40     40    
75     25     50    
Catalog     Catalog     Catalog    
44TSSOP     20TSSOP     30TSSOP    

Related end equipment

  • Light Electric Vehicles (LEV): eBikes, eScooters,
    Pedelec, and Pedal-Assist Bicycles
  • Power and Gardening Tools
  • Battery Backup and UPS Systems
  • Wireless Base Station Backup Systems
  • 12-V, 18-V, 24-V, 36-V, and 48-V Battery Packs

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