BQ77908DBT

单机多节锂离子/聚合物精密保护器 Stand-Alone Multi-Cell Lithium-Ion/Polymer Precision Protectors

DESCRIPON

The bq77908 precision protector is a complete stand-alone, self-contained battery-protection and cell-balancing device intended for Li-ion/polymer battery packs.

The bq77908 monitors 4 to 8 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.

FEATURES

• 4-, 5-, 6-, 7-, or 8 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 40 V

• Integrated 3.3-V Micro-Power LDO Regulator

• Low Supply Current

   – Normal Mode: 50 µA, Typical

   – Shutdown Mode, LDO OFF: 5 µA, Typical

• 38-Pin TSSOP Package

• Internal 50-mA Automatic Cell Balancing

APPLICATIONS

• Cordless Power Tools

• Cordless Lawn Equipment

• Electric Bikes

• UPS

• Medical Equipment

• Light Electric Vehicles LEV