BQ21040
- Charging
- 1% Charge Voltage Accuracy
- 10% Charge Current Accuracy
- Low Battery Leakage Current (1 µA)
- Programmable Charge Current using External Resistor up to 800 mA
- 4.2-V Li-Ion and Li-Pol Charger
- Protection
- 30-V Input Rating; with 6.6-V Input Overvoltage Protection
- Input Voltage Dynamic Power Management
- 125°C Thermal Regulation; 150°C Thermal Shutdown Protection
- OUT Short-Circuit Protection and ISET Short Detection
- Overtemperature Sensing Protection Through NTC
- Fixed 10-Hour Safety Timer
- System
- Status Indication – Charging/Done
- Available in Small SOT-23 Package
The bq21040 device is a highly integrated Li-Ion and Li-Pol linear battery charger device targeted at space-limited portable applications. The device operates from either a USB port or AC adapter. The high input voltage range with input overvoltage protection supports low-cost unregulated adapters.
The bq21040 has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system load does not keep the battery from charging fully during the 10 hour safety timer.
The battery is charged in three phases: conditioning, constant current and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded.
The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination. The pre-charge current and termination current threshold are fixed to 20% and 10%, respectively. The fast charge current value is programmable through an external resistor.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | bq21040 0.8-A, Single-Input, Single Cell Li-Ion and Li-Pol Battery Charger datasheet (Rev. D) | PDF | HTML | 2019年 1月 8日 |
| Application note | Temperature Sensing Without an Adaptor Present on the BQ21040 | PDF | HTML | 2022年 9月 15日 | |
| Application note | BQ2404x, BQ2405x, and BQ2409x Frequently Asked Questions | 2019年 2月 25日 | ||
| Analog Design Journal | 2Q 2016 Analog Applications Journal Issue | 2016年 4月 26日 | ||
| Analog Design Journal | Battery-charging considerations for low-power applications | 2016年 4月 26日 | ||
| EVM User's guide | bq21040 0.8-A Single-Input, Single-Cell Li-Ion Battery Charger EVM User's Guide | 2016年 3月 21日 |
設計與開發
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BQ21040EVM-777 — BQ21040 0.8A 單輸入單節鋰離子電池充電器評估模組
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| SOT-23 (DBV) | 6 | 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。