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.
Feature
- 2-Series, 3-Series, or 4-Series Cell SecondaryProtection
- 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, 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
- Second-Level Protection in Li-Ion Battery Packs
