BQ25172
- Input voltage up to 30-V tolerant
- Automatic Sleep Mode for low power consumption
- 350-nA battery leakage current
- 85-µA input leakage current when charge disabled
- Supports 1- to 6-cell NiMH with intermittent-charging
- External resistor programmable operation
- VSET to set NiMH series cell-count from 1s to 6s
- ISET to set charge current from 10 mA to 800 mA
- TMR to set charge safety timer duration from 4 hr to 22 hr
- High accuracy
- ±0.5% charge voltage accuracy
- ±10% charge current accuracy
- Charging features
- NTC thermistor input to monitor battery temperature
- Cold and hot temperature charging disabled
- VOUT_OVP reduced at cool temperatures
- TS pin for charging function control
- Open-drain output for status and fault indication
- Integrated fault protection
- 18-V IN overvoltage protection
- VSET based OUT overvoltage protection
- 1000-mA overcurrent protection
- 125°C thermal regulation; 150°C thermal shutdown protection
- OUT short-circuit protection
- VSET, ISET, TMR pins short/open protection
The BQ25172 is an integrated 800-mA linear charger for 1-cell to 6-cell NiMH batteries targeted at industrial and medical applications. The device has a single power output that charges the battery. The system load can be placed in parallel with the battery, as long as the average system load does not prevent the battery from being charged fully within the safety timer duration. When the system load is placed in parallel with the battery, the charge current is shared between the system and the battery.
The device charges NiMH cells in constant current mode only and terminates the charge cycle when the programmable timer expires or the battery voltage exceeds the VOUT_OVP threshold. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold TREG, is exceeded.
The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current, charge status display, and timer-based charge termination. The series cell-count, charge current, and charge timer are programmable through external resistors. Intermittent charging allows a NiMH battery to automatically recharge for a reduced timer duration once its voltage falls below the recharge threshold.
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技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | BQ25172: 800-mA Linear Battery Charger for 1- to 6-Cell NiMH Batteries datasheet | PDF | HTML | 2022年 6月 1日 |
| Certificate | BQ25172EVM EU RoHS Declaration of Conformity (DoC) | 2022年 9月 2日 | ||
| User guide | BQ25172EVM Evaluation Module User's Guide | PDF | HTML | 2022年 7月 22日 |
設計與開發
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BQ25172EVM — 適用於 800-mA 一至六芯 NiMH 線性電池充電器的 BQ25172 評估模組
BQ25172 評估模組 (EVM) 的設計目的在於評估和測試 BQ25172 裝置的各種運作模式。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WSON (DSG) | 8 | 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。