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

View more

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

 
Function
Communication Interface
Encryption
Shutdown Current (uA)
# Series Cells
Delay Timer (Typ) (Sec)
Protection FETs
Cell Chemistry
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
BQ76940 BQ76920 BQ76930
Protection     Protection     Protection    
I2C     I2C     I2C    
CRC     CRC     CRC    
2     2     2    
>4 Cells     2-4 Cells
>4 Cells    
>4 Cells    
  Variable      
External     External     External
Internal    
Li-Ion
Li-Polymer
LiFePO4    
  Li-Ion
Li-Polymer
LiFePO4    
Battery Monitor/Gauge
Internal Cell Balance
Monitor Only
Over Voltage Protection
Under Voltage Protection    
Battery Monitor/Gauge
Internal Cell Balance
Monitor Only
Over Voltage Protection
Under Voltage Protection    
Battery Monitor/Gauge
Internal Cell Balance
Monitor Only
Over Voltage Protection
Under Voltage Protection    
Catalog     Catalog     Catalog    
-40 to 85     -40 to 85     -40 to 85    
44TSSOP     20TSSOP     30TSSOP    
3.95 | 1ku     1.50 | 1ku     2.75 | 1ku    

Companion parts

Part # Name Product Family Comments
BQ78350   Companion CEDV Fuel Gauge Battery Management Controller for bq76940 Monitor Family   BATTERY MANAGEMENT PRODUCTS - BATTERY FUEL GAUGE    
Click Here