6 to 10-Series Cell Li-Ion and Li-Phosphate Battery Monitor (bq76940 Family) - BQ76930

BQ76930 (ACTIVE)

6 to 10-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.

The bq76920 device supports up to 5-series cells or typical 18-V packs, the bq76930 handles up to 10- series cells or typical 36-V packs, and the bq76940 works for up to 15-series cells or typical 48-V packs. A variety of battery chemistries may be managed with these AFEs, including Lithium Ion, Lithium iron phosphate, and more.

Via I2C, a host controller can use the bq769x0 to implement many battery pack management functions, such as monitoring (cell voltages, pack current, pack temperatures), protection (controlling charge/discharge FETs), and balancing. Integrated A/D converters enable a purely digital readout of critical system parameters, with calibration handled in TI\x92s manufacturing process.

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

View more

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
Approx. Price (US$)
BQ76930 BQ76920 BQ76940
Monitoring (Analog Front-End)     Monitoring (Analog Front-End)     Monitoring (Analog Front-End)    
6     3     9    
10     5     15    
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    
50     25     75    
Catalog     Catalog     Catalog    
30TSSOP     20TSSOP     44TSSOP    
2.75 | 1ku     1.50 | 1ku     3.95 | 1ku    

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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