BQ77908A
- 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
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
- 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
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | bq77908A Multi-Cell Lithium-Ion/Polymer Precision Protector datasheet (Rev. A) | 2014年 9月 22日 | |
| Application note | Programming Software for bq77910 and bq77908 | 2012年 7月 9日 | ||
| Application note | bq77908/910 series FET Considerations (Rev. A) | 2012年 4月 25日 | ||
| EVM User's guide | bq77908AEVM Evaluation Module | 2012年 1月 26日 |
設計與開發
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| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| TSSOP (DBT) | 38 | Ultra Librarian |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。