1 Features
• 2-series and 3-series cell overvoltage monitor for
secondary protection
• Fixed programmable delay timer
• Fixed OVP threshold
– Available range from 3.85 V to 4.6 V
• Fixed OVP delay option: 4 s or 6.5 s
• 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
– 6-pin SON

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

3 Description
The BQ2945xy family of products is a secondary-level
voltage monitor and protector for Li-ion battery pack
systems. Each cell is monitored independently for
an overvoltage condition. Based on the configuration,
an output is triggered after a fixed delay if any of
the two or three cells has an overvoltage condition.
This output is triggered into a high state after an
overvoltage condition satisfies the specified delay
timer.