BQ77905
- NORMAL mode: 6 µA (BQ77904 and BQ77905)
- Full suite of voltage, current, and temperature protections
- Scalable cell count from 3 series to 20 series or more
- Voltage protection (accuracy ±10 mV)
- Overvoltage: 3 V to 4.575 V
- Undervoltage: 1.2 V to 3 V
- Open cell and open-wire detection (OW)
- Current Protection
- Overcurrent discharge 1: –10 mV to –85 mV
- Overcurrent discharge 2: –20 mV to +170 mV
- Short circuit discharge: –40 mV to +340 mV
- Accuracy ±20% for ≤ 20 mV, ±30% for > 20 mV across full temperature
- Temperature protection
- Overtemperature charge: 45°C or 50°C
- Overtemperature discharge: 65°C or 70°C
- Undertemperature charge: –5°C or 0°C
- Undertemperature discharge: –20°C or –10°C
- Additional Features
- Independent charge (CHG) and discharge (DSG) FET drivers
- 36-V absolute maximum rating per cell input
- Built-in-self-test functions for high reliability
- SHUTDOWN mode: 0.5-µA maximum
- Functional Safety-Capable
The BQ77904 and BQ77905 devices are low-power battery pack protectors that implement a suite of voltage, current, and temperature protections without microcontroller (MCU) control. The device’s stackable interface provides simple scaling to support battery cell applications from 3 series to 20 series or more. Protection thresholds and delays are factory-programmed and available in a variety of configurations. Separate overtemperature and undertemperature thresholds for discharge (OTD and UTD) and charge (OTC and UTC) are provided for added flexibility.
The device achieves pack protection through the integrated independent CHG and DSG low-side NMOS FET drivers, which may be disabled through two control pins. These control pins may also be used to achieve cell protection solutions for higher series (6 series and beyond) in a simple and economical manner. To do this, simply cascade a higher device CHG and DSG outputs to the immediate lower device control pins. For a reduced component count, all protection faults use internal delay timers.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | BQ77904, BQ77905 3-Series to 20-Series Ultra Low-Power Voltage, Current, Temperature, and Open-Wire Stackable Lithium-Ion Battery Protector datasheet (Rev. K) | PDF | HTML | 2020/7/31 | ||
| 應用說明 | bq77905 20S Cell Stacking Configuration (Rev. B) | 2021/6/23 | ||||
| 功能安全資訊 | BQ77905 Function Safety Capable | 2020/7/13 | ||||
| 電子書 | E-book: An engineer’s guide to industrial robot designs | 2020/2/12 | ||||
| 應用說明 | High Side Charge FET Implementation | 2018/7/23 | ||||
| 應用說明 | bq77905 Pin Equivalent Diagrams | 2017/11/28 | ||||
| 應用說明 | bq77905 Shutdown for Current Reduction | 2017/7/21 | ||||
| 應用說明 | BQ77905 Design Considerations in High-Current Applications | 2016/12/5 | ||||
| 應用說明 | Bq77905 Using Multiple FETs | PDF | HTML | 2016/7/15 | |||
| EVM User's guide | bq77905 3-5S Low-Power Protector Evaluation Module (Rev. A) | 2016/7/7 | ||||
| 應用說明 | bq77905 Separate Current Paths (Rev. A) | 2016/7/7 |
設計與開發
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BQ77905EVM-707 — bq77905 3 至 5 節串聯電池先進堆疊式低功耗電池保護器評估模組
bq77905EVM-707 是適用於 bq77905 低功率電池保護器 IC 的評估板。 bq77905 IC 支援 3-5S 電池芯配置，可透過堆疊方式輕鬆支援完整堆疊的 20 個串聯電池芯。此外，bq77905 實作一套可原廠編程的電壓、電流及溫度保護；在 EVM 上，您會找到旨在評估電路板性能的預設配置 (bq7790500)。此外，bq77905 針對放電（OTD、UTD）和充電（OTC、UTC）分別設有獨立的溫度過高和過低閾值，可提升靈活度。EVM 包含熱敏電阻和分流器，可輕鬆模擬溫度過高和過低的情況。 bq77905 電池組保護是透過直接且獨立的 CHG/DSG 低壓側 (...)
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| TSSOP (PW) | 20 | Ultra Librarian |
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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。