BQ77908A Series
Stand-Alone Multi-Cell Li-Ion/Li-Polymer Precision Protector
Manufacturer: Texas Instruments
Link to Manufacturer Page: https://www.ti.com/
Catalog
Stand-Alone Multi-Cell Li-Ion/Li-Polymer Precision Protector
| Part | Number of Cells [Max] [custom] | Number of Cells [Min] [custom] | Interface | Package / Case | Package / Case | Package / Case | Fault Protection | Supplier Device Package | Function | Operating Temperature [Min] | Operating Temperature [Max] | Mounting Type | Battery Chemistry |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Texas Instruments BQ77908ADBT | 8 | 4 | I2C | 4.4 mm | 38-TFSOP | 0.173 in | Over Current, Over Temperature, Over/Under Voltage, Short Circuit | 38-TSSOP | Multi-Function Controller | -25 °C | 85 C | Surface Mount | Lithium Ion/Polymer |
Texas Instruments BQ77908ADBTR | 8 | 4 | I2C | 4.4 mm | 38-TFSOP | 0.173 in | Over Current, Over Temperature, Over/Under Voltage, Short Circuit | 38-TSSOP | Multi-Function Controller | -25 °C | 85 C | Surface Mount | Lithium Ion/Polymer |
Key Features
• 4-, 5-, 6-, 7-, or 8-Series Cell ProtectionIndividual Cell-Voltage MonitoringLow-Side NMOS FET Drive for Charge and Discharge ControlCompatible With 1-mΩ Current-Sense ResistorSupply-Voltage Range From 5.6 V to 40 VIntegrated 3.3-V Micro-Power LDO RegulatorLow Supply CurrentNormal Mode: 50 µA, TypicalShutdown Mode, LDO OFF: 5 µA, Typical38-Pin TSSOP PackageInternal 50-mA Automatic Cell Balancing4-, 5-, 6-, 7-, or 8-Series Cell ProtectionIndividual Cell-Voltage MonitoringLow-Side NMOS FET Drive for Charge and Discharge ControlCompatible With 1-mΩ Current-Sense ResistorSupply-Voltage Range From 5.6 V to 40 VIntegrated 3.3-V Micro-Power LDO RegulatorLow Supply CurrentNormal Mode: 50 µA, TypicalShutdown Mode, LDO OFF: 5 µA, Typical38-Pin TSSOP PackageInternal 50-mA Automatic Cell Balancing
Description
AI
The bq77908A is a battery protection and cell balancing device intended for Li-Ion and Li-Polymer battery packs.
The bq77908A monitors 4- to 8-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.
Additional advanced safety features of the bq77908A 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
Fixed Hardware Protection Functions
The bq77908A is a battery protection and cell balancing device intended for Li-Ion and Li-Polymer battery packs.
The bq77908A monitors 4- to 8-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.
Additional advanced safety features of the bq77908A 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
Fixed Hardware Protection Functions