BQ77PL900
- 5, 6, 7, 8, 9, or 10 Series-Cell Primary Protection
- PMOS FET Drive for Charge and Discharge FETs
- Capable of Operation with 1-m
Sense Resistor - Supply Voltage Range from 7 V to 50 V
- Low Supply Current of 450 µA Typical
- Integrated 5 V 25-mA LDO
- Integrated 3.3 V 25-mA LDO
- Stand-Alone Mode
- Pack Protection Control and Recovery
- Individual Cell Monitoring
- Integrated Cell Balancing
- Programmable Threshold and Delay Time for OvervoltageUndervoltage Overcurrent in Discharge Short Circuit in Discharge
- Fixed Overtemperature Protection
- Host Control Mode
- I2C Interface to Host Controller
- Analog Interface for Host Cell Measurement and System Charge/Discharge Current
- Host-Controlled Protection Recovery
- Host-Controlled Cell Balancing
- APPLICATIONS
- Cordless Power Tools
- Power Assisted Bicycle/Scooter
- Uninterruptible Power Supply (UPS) Systems
- Medical Equipment
- Portable Test Equipment
The bq77PL900 is a five to ten series cell lithium-ion battery pack protector. The integrated I2C communications interface allows the bq77PL900 also to be as an analog front end (AFE) for a Host controller. Two LDOs, one 5 V/25 mA and one 3.3 V/25 mA, are also included and may be used to power a host controller or support circuitry.
The bq77PL900 integrates a voltage translation system to extract battery parameters such as individual cell voltages and charge/discharge current. Variables such as voltage protection thresholds and detection delay times can be programmed by using the internal EEPROM.
The bq77PL900 can act as a stand-alone self-contained battery protection system (stand-alone mode). It can alternatively be combined with a host microcontroller to offer fuel gauge or other battery management capabilities to the host system (host-control mode).
The bq77PL900 provides full safety protection for overvoltage, undervoltage, overcurrent in discharge, and short circuit in discharge conditions. When the EEPROM programmable safety thresholds are reached, the bq77PL900 turns off the FET drive autonomously. No external components are needed to configure the protection features.
The analog front end (AFE) outputs allow a host controller to observe individual cell voltages and charge/discharge currents. The host controller's analog-to-digital converter connects to the bq77PL900 to acquire these values.
Cell balancing can be performed autonomously, or the host controller can activate it individually via a cell bypass path integrated into the bq77PL900. Internal control registers accessible via the I2C interface configure this operation. The maximum balancing bypass current is set via an external series resistor and the internal FET-on resistance (typically 400 ). Optionally, external bypass cell balance FETs can be used for increased current capability.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | 5-10 cell Li-ion Battery protection & AFE datasheet (Rev. B) | 2008年 12月 3日 | |
| EVM User's guide | bq77PL900EVM-001 (Rev. B) | 2018年 3月 6日 | ||
| Analog Design Journal | Cell balancing buys extra run time and battery life | 2009年 3月 11日 | ||
| Application note | Cell Balancing with the bq77PL900 | 2008年 7月 3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 |
|---|---|---|
| SSOP (DL) | 48 | 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。