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.