Texas Instruments bq77910A Multi-Cell Li-Ion / Polymer Precision ProtectorsTexas Instruments bq77910A precision protector is a complete stand-alone, self-contained battery-protection and cell-balancing device intended for Li-ion/polymer battery packs. TI bq77910A monitors 4 to 10 series individual cell voltages and provides fast-acting outputs that 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. TI bq77910A precision protector provides automatic cell balancing using internal 50mA 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 disabled completely. Additional advanced safety features of the bq77910A include the ability to control split power-path MOSFETs, an open-cell sense-line detection mechanism, and the ability to detect an open or shorted external temperature sensor. These TI devices are ideal for use in cordless power tools, cordless lawn equipment, and electric bikes.
|
Features
- 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 1mΩ Current-Sense Resistor
- Supply-Voltage Range From 5.6V to 50V
- Integrated 3.3-V Micro-Power LDO Regulator
- Low Supply Current
- Normal Mode: 50µA, Typical
- Shutdown Mode, LDO OFF: 3µA, Typical
- Internal 50mA Automatic Cell Balancing
Applications
- Cordless Power Tools
- Cordless Lawn Equipment
- Electric Bikes
- UPS
- Medical Equipment
- Light Electric Vehicles (LEV)
|
