1 Features
• Single-Cell Overvoltage Monitor for Secondary
Protection
• Fixed Programmable Delay Timer
• Fixed Overvoltage Protection (OVP) Threshold
– Available Range of 3.85V to 4.6V
• Fixed OVP Delay Option: 4s or 6.5s
• High-Accuracy OVP: ±10mV
• Low Power Consumption ICC approximately 1μA
(VCELL(ALL) < VPROTECT)
• Low Leakage Current per Cell Input < 100nA
• Small Package Footprint
– 6-Pin SON

2 Applications
• Second-level protection in Li-ion battery packs in:
– Tablets
– Slates
– Portable equipment and instrumentation

3 Description
The BQ2946xx family of products is a secondary-level
overvoltage monitor and protector for Li-Ion battery
pack systems. The cell is monitored for overvoltage
condition and triggers an internal counter once the
OVP threshold is exceeded; after a fixed set delay,
the out is transitioned to a high level. The output is
reset (goes low) if the cell voltage drops below the set
threshold minus the hysteresis.