The bq77910A is a battery
protection and cell balancing device intended for Li-Ion and Li-Polymer battery packs.
The 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 safety conditions 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.
WARNING: The bq77910A-series
integrated circuit helps system designers greatly enhance the safety of their Li-Ion and Li-Polymer
battery packs when integrated effectively and in accordance with the instructions detailed in this
document by technically qualified personnel familiar with battery pack application safety. This
data sheet must be read in its entirety before working with the bq77910A.
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 fault condition.
Programmable Protection
Functions
- Wide range of programmable detection thresholds and delay times
- Configurable for multiple cell types and application requirements:
- Cell overvoltage
- Cell undervoltage
- Pack discharge overcurrent
- Pack discharge short circuit
- Pack charge short-circuit current
- Variable gain (×1 or ×5) current-sense circuit
- Compatible with a wide range of current-sense resistors (1-mΩ to 5-mΩ typical) sized for application requirements
Fixed Hardware Protection Functions
- Preset overtemperature protections
- Open-cell detection
- Open and shorted thermistor detection
- Brownout protection quickly shuts off FETs under low-battery conditions to minimize the risk of FET overheating
The bq77910A is a battery
protection and cell balancing device intended for Li-Ion and Li-Polymer battery packs.
The 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 safety conditions 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.
WARNING: The bq77910A-series
integrated circuit helps system designers greatly enhance the safety of their Li-Ion and Li-Polymer
battery packs when integrated effectively and in accordance with the instructions detailed in this
document by technically qualified personnel familiar with battery pack application safety. This
data sheet must be read in its entirety before working with the bq77910A.
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 fault condition.
Programmable Protection
Functions
- Wide range of programmable detection thresholds and delay times
- Configurable for multiple cell types and application requirements:
- Cell overvoltage
- Cell undervoltage
- Pack discharge overcurrent
- Pack discharge short circuit
- Pack charge short-circuit current
- Variable gain (×1 or ×5) current-sense circuit
- Compatible with a wide range of current-sense resistors (1-mΩ to 5-mΩ typical) sized for application requirements
Fixed Hardware Protection Functions
- Preset overtemperature protections
- Open-cell detection
- Open and shorted thermistor detection
- Brownout protection quickly shuts off FETs under low-battery conditions to minimize the risk of FET overheating