IC BATT PROT LI-ION 2-4CEL 8WSON
• 2-, 3-, and 4-Series Cell Overvoltage Protection
• External Capacitor-Programmed Delay Timer
• Factory Programmed OVP Threshold
(Threshold Range 3.85 V to 4.6 V)
• Output Options: Active High or Open Drain Active Low
• High-Accuracy Overvoltage Protection: ±10 mV
• Low Power Consumption ICC ≈ 1 µA
(VCELL(ALL) < VPROTECT) • Low Leakage Current Per Cell Input < 100 nA
• Small Package Footprint
– 8-Pin SON (2 mm x 2 mm)
• UPS Battery Backup
The bq2947xy family of products is an overvoltage monitor and protector for Li-Ion battery pack systems. Each cell is monitored independently for an overvoltage condition.
In the bq2947xy device, an external delay timer is initiated upon detection of an overvoltage condition on any cell. Upon expiration of the delay timer, the output is triggered into its active state (either high or low, depending on the configuration). The external delay timer feature also includes the ability to detect an open or shorted delay capacitor on the CD pin, which will similarly trigger the output driver in an overvoltage condition.
For quicker production-line testing, the bq2947xy device provides a Customer Test Mode with reduced delay time.
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