BQ29449 2-4 节串联锂离子/锂聚合物电池的二级过压保护 (4.30V)
BQ29449 描述
The bq2944x is a secondary overvoltage protection IC for 2-series, 3-series, or 4-series cell lithium-ion battery packs that incorporates a high-accuracy precision overvoltage detection circuit.
The voltage of each cell in a battery pack is compared to an internal reference voltage. If any cells reach an overvoltage condition, the bq2944x device starts a timer that provides a delay proportional to the capacitance on the CD pin. Upon expiration of the internal timer, the OUT pin changes from a low state to a high state. An optional latch configuration is available that holds the OUT pin in a high state indefinitely after an overvoltage condition has satisfied the specified delay timer period. The latch is released when the CD pin is shorted to GND.
|
BQ29440 |
BQ29449 |
BQ2944L0 |
BQ2944L9 |
| Cells Protected |
2, 3, 4 |
2, 3, 4 |
2, 3, 4 |
2, 3, 4 |
| Overvoltage Threshold(V) |
4.35 |
4.30 |
4.35 |
4.30 |
| Protection FETs |
External |
External |
External |
External |
| Shutdown Current(uA) |
3 |
3 |
3 |
3 |
| Pin/Package |
8SON |
8SON |
8SON |
8SON |
| Approx. Price (US$) |
0.45 | 1ku |
0.45 | 1ku |
0.45 | 1ku |
0.45 | 1ku |
BQ29449 特性
- 2-Series, 3-Series, or 4-Series Cell Secondary Protection
- External Capacitor-Controlled Delay Timer
- Low Power Consumption ICC < 2 µA Typical [VCELL(ALL) < VPROTECT]
- High-Accuracy Overvoltage Protection: ±25 mV With TA = 0°C to 60°C
- Fixed Overvoltage Protection Thresholds: 4.30 V, 4.35 V
- Small 8L QFN Package
- APPLICATIONS
- Second-Level Protection in Li-Ion Battery Packs
- Notebook Computers
- Power Tools
- Portable Equipment and Instrumentation
BQ29449 芯片订购指南
| 器件 |
状态 |
温度 |
价格（美元） |
封装 | 引脚 |
封装数量 | 封装载体 |
丝印标记 |
| BQ29449DRBR |
ACTIVE |
-40 to 85 |
0.45 | 1ku |
SON (DRB) | 8 |
3000 | LARGE T&R |
449 |
| BQ29449DRBT |
ACTIVE |
-40 to 85 |
0.55 | 1ku |
SON (DRB) | 8 |
250 | SMALL T&R |
449 |
BQ29449 质量与无铅数据
| 器件 |
环保计划* |
铅/焊球涂层 |
MSL 等级/回流焊峰 |
环保信息与无铅 (Pb-free) |
DPPM / MTBF / FIT 率 |
| BQ29449DRBR |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
BQ29449DRBR |
BQ29449DRBR |
| BQ29449DRBT |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
BQ29449DRBT |
BQ29449DRBT |
BQ29449 应用技术支持与电子电路设计开发资源下载
- BQ29449 数据资料 dataSheet 下载.PDF
- TI 德州仪器电池管理产品选型与价格 . xls
- 照明和显示屏电源选择指南 (PDF 1427 KB)
- QFN Layout Guidelines (PDF 1279 KB)
- 笔记本电脑指南 (Rev. A) (PDF 2774 KB)
- 全面认识开关型电源中的BUCK-BOOST功率级 (Rev. A)
(PDF 2206 KB)
- PowerPAD™ Made Easy (PDF 57 KB)
- 标准线性产品交叉参考 (Rev. D)
(PDF 1058 KB)
- 模数规格和性能特性术语表 (Rev. A) (PDF 1993 KB)
- 所选封装材料的热学和电学性质 (PDF 645 KB)
- 高速数据转换 (PDF 1967 KB)
BQ29449 相关工具
| 名称 |
型号 |
公司 |
工具/软件类型 |
| BQ29449 评估模块 |
BQ29449EVM |
Texas Instruments |
开发电路板/EVM |
| BQ29449 评估模块 |
BQ29449EVM-193 |
Texas Instruments |
开发电路板/EVM |
