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1 Features

? 2-, 3-, 4-, and 5-series cell overvoltage protection

? Internal delay timer

? Fixed OVP threshold

? High-accuracy overvoltage protection:

± 10 mV

? Low power consumption ICC ≈ 1 μA

(VCELL(ALL) < VPROTECT)

? Low leakage current per cell input < 100 nA

? Functional Safety-Capable

– Documentation available to aid functional safety

system design

? Package footprint options:

– Small 8-pin QFN (3.00 mm × 4.00 mm)

– Leaded 8-pin MSOP (3.00 mm × 5.00 mm,

including leads)

2 Applications

? Protection for li-ion battery packs used in:

– Handheld garden tools

– Handheld power tools

– Cordless vacuum cleaners

– UPS battery backup

– Light electric vehicles (eBike, eScooter, pedal

assist bicycles)

3 Description

The BQ7718xy family of products provides an

overvoltage monitor and protector for Li-Ion battery

pack systems. Each cell is monitored independently

for an overvoltage condition. For quicker productionline

testing, the BQ7718xy device provides a

Customer Test Mode (CTM) with greatly reduced

delay time.

In the BQ7718xy device, an internal 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).