bq77910 Precision Protector

By Texas Instruments 59

bq77910 Precision Protector

Texas Instruments' bq77910 precision protector is a complete stand-alone, self-contained battery-protection and cell-balancing device intended for Li-ion/polymer battery packs. The bq77910 monitors 4 to 10 series individual cell voltages and provides fast-acting outputs which may be used to drive N-channel MOSFETs to interrupt the power path. Activation delays and recovery methods for each safety condition are fully programmable in non-volatile memory. Automatic cell balancing is provided using internal 50-mA cell circuits. A robust balancing algorithm ensures optimum performance by maintaining all cell voltages in balance. Balancing may be configured to operate at all times, only during charge, or can be disabled completely.

Features Applications
  • 4-, 5-, 6-, 7-, 8-, 9-, or 10 series cell protection
  • Individual cell-voltage monitoring
  • Low-side NMOS FET drive for charge and discharge control
  • Compatible with 1 mΩ current-sense resistor
  • Supply-voltage range from 5.6 V to 50 V
  • Integrated 3.3 V micro-power LDO regulator
  • Low supply current 
  • Cordless power tools
  • Cordless lawn equipment
  • Electric bikes
  • UPS
  • Medical equipment
  • Light electric vehicles (LEV)