- 制造厂商：TI
- 产品类别：电源管理
- 技术类目：电池管理 IC - 电池保护器
- 功能描述：2-4 节串联锂离子/锂聚合物电池的二级过压保护 (4.30V)
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The bq2944x is a secondary overvoltage protection IC for 2-series, 3-series, or 4-series cell Li-Ion battery packs that incorporates a high-accuracy precision overvoltage detection circuit.
FUNCTION
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.
- 2-Series, 3-Series, or 4-Series Cell Secondary Protection
- External Capacitor-Controlled Delay Timer
- Low Power Consumption ICC < 2μA Typical [VCELL(ALL) < VPROTECT]
- High-Accuracy Overvoltage Protection: ±25 mV with TA = 0°C to 60°C
- Fixed Overvoltage Protection Thresholds: 4.30V, 4.35V, 4.40V, 4.45V, 4.50V
- Small 8L QFN Package
- APPLICATIONS
- Second-Level Protection in Li-Ion Battery Packs
- Notebook Computers
- Power Tools
- Portable Equipment and Instrumentation
- Second-Level Protection in Li-Ion Battery Packs
- Function
- Protection
- Number of series cells (Min)
- 2, 3, 4
- Number of series cells (Max)
- 3, 4
- Features
- Overvoltage, Single pin output drive
- Typical operating current (Typ) (uA)
- 2
- Rating
- Catalog
- Vin (Max) (V)
- 28
BQ29449的完整型号有：BQ29449DRBR、BQ29449DRBT，以下是这些产品的关键参数及官网采购报价：
BQ29449DRBR，工作温度：-40 to 85，封装：SON (DRB)-8，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网BQ29449DRBR的批量USD价格：.909（1000+）
BQ29449DRBT，工作温度：-40 to 85，封装：SON (DRB)-8，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网BQ29449DRBT的批量USD价格：1.067（1000+）
BQ29449DRBR，工作温度：-40 to 85，封装：SON (DRB)-8，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网BQ29449DRBR的批量USD价格：.909（1000+）
BQ29449DRBT，工作温度：-40 to 85，封装：SON (DRB)-8，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网BQ29449DRBT的批量USD价格：1.067（1000+）
