BQ29442数据手册集成电路（IC）的电池管理规格书PDF

描述 Description

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.

特性 Features

• 2-Series, 3-Series, or 4-Series Cell SecondaryProtection
• External Capacitor-Controlled Delay Timer
• Low Power Consumption ICC [VCELL(ALL) PROTECT]
• High-Accuracy Overvoltage Protection: ±25 mV with TA = 0°C to 60°C
• Fixed Overvoltage Protection Thresholds: 4.30 V, 4.35 V, 4.40 V, 4.45 V, 4.50 V
• Small 8L QFN Package
• APPLICATIONS
- Second-Level Protection in Li-Ion Battery Packs
- Notebook Computers
• Power Tools
• Portable Equipment and Instrumentation