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

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 or 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. Through 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’s 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 absolute maximum (up to 108 V)
    • Simple I2C compatible interface (CRC option)
    • Random cell connection tolerant

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Parametrics

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Part number Order Vin (Max) (V) Number of series cells (Min) Number of series cells (Max) Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
BQ76940 Order now 75     9     15     Low side driver
Over-current in discharging protection
Short current detection    
-40 to 85     TSSOP | 44     44TSSOP: 71 mm2: 6.4 x 11.15 (TSSOP | 44)    
BQ76920 Order now 25     3     5     Low side driver
Over-current in discharging protection
Short current detection    
-40 to 85     TSSOP | 20     20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)    
BQ76925 Order now 26.4     3     6     Cell Balancing
I2C Support
Multi-cell Support
Open wire detection
Requires separate MCU    
-25 to 85     TSSOP | 20
VQFN | 24    
20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)
24VQFN: 16 mm2: 4 x 4 (VQFN | 24)    
BQ76930 Order now 50     6     10     Low side driver
Over-current in discharging protection
Short current detection    
-40 to 85     TSSOP | 30     30TSSOP: 50 mm2: 6.4 x 7.8 (TSSOP | 30)