BQ76942 3-series to 10-series multicell battery monitor and protector | TI.com

BQ76942
This product is prototype/experimental and has not been released to the market. Testing and final processes may not be complete. This product may be subject to further changes or possible discontinuation.
3-series to 10-series multicell battery monitor and protector

 

Sample availability

Preproduction samples are available (PBQ76942PFBT). Request now

Description

The Texas Instruments BQ76942 is a highly integrated, high accuracy battery monitor and protector for 3-series to 10-series Li-Ion, Li-Polymer, and LiFePO4 battery packs. The device includes a high accuracy monitoring system, a highly configurable protection subsystem, and support for autonomous or host controlled cell balancing. Integration includes high-side charge-pump NFET drivers, dual programmable LDOs for external system use, and a host communication peripheral supporting 400-kHz I2C, SPI, and HDQ one-wire standards. The BQ76942 is available in a 48-pin TQFP package.

Features

  • Battery monitoring capability for 3-series to 10-series cells
  • Integrated charge pump for high-side NFET protection with optional autonomous recovery
  • Extensive protection suite including voltage, temperature, current, and internal diagnostics
  • Two independent ADCs
    • Support for simultaneous current and voltage sampling
    • High-accuracy coulomb counter with input offset error < 1 µV (typical)
    • High accuracy cell voltage measurement < 10 mV (typical)
  • Wide-range current applications (±200-mV measurement range across sense resistor)
  • Integrated secondary chemical fuse drive protection
  • Autonomous or host-controlled cell balancing
  • Multiple power modes (typical battery pack operating range conditions)
    • NORMAL mode: 250 µA
    • Multiple SLEEP mode options: 20 µA to 60 µA
    • Multiple DEEPSLEEP mode options: 10 µA to 14 µA
    • SHUTDOWN Mode: < 2 µA
  • High voltage tolerance of 85 V on cell connect and select additional pins
  • Support for temperature sensing using internal sensor and up to 9 external thermistors
  • Integrated one-time-programmable (OTP) memory programmable by customers on production line
  • Communication options include 400-kHz I2C, SPI, and HDQ one-wire interface
  • Dual programmable LDOs for external system usage
  • 48-pin TQFP package (PFB)

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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) Rating Package Group Package size: mm2:W x L (PKG)
BQ76942 Order now 55     3     16     Cell Balancing
High side driver
I2C Support
Integrated ADC
Multi-cell Support
Open wire detection
Over-current in charging protection
Over-current in discharging protection
Over-temperature (OT)
Over-voltage (OV)
Programmable EEPROM or EPROM
Short current detection
Temperature sense
Under-temperature (UT)
Under-voltage (UV)    
-40 to 85     Catalog     TQFP | 48     48TQFP: 81 mm2: 9 x 9 (TQFP | 48)    
BQ76940 Order now 75     9     15     Low side driver
Over-current in discharging protection
Short current detection    
-40 to 85     Catalog     TSSOP | 44     44TSSOP: 71 mm2: 6.4 x 11.15 (TSSOP | 44)    
BQ76952 Order now 80     3     16     Cell Balancing
High side driver
I2C Support
Integrated ADC
Multi-cell Support
Open wire detection
Over-current in charging protection
Over-current in discharging protection
Over-temperature (OT)
Over-voltage (OV)
Programmable EEPROM or EPROM
Short current detection
Temperature sense
Under-temperature (UT)
Under-voltage (UV)    
-40 to 85     Catalog     TQFP | 48     48TQFP: 81 mm2: 9 x 9 (TQFP | 48)