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1 Features

? 3-series cell to 16-series cell protection

? High-accuracy overvoltage protection

– ± 10mV at 25°C

– ± 20mV from 0°C to 60°C

? Overvoltage protection options from 3.55V to 5.1V

? Undervoltage protection with options from 1.0V to

3.5V

? Open-wire connection detection

? Overtemperature protection

? Undertemperature protection

? Random cell connection

? Functional safety-capable

? Fixed internal delay timers

? Fixed detections thresholds

? Fixed output drive type for each of COUT and

DOUT

– Active high or active low

– Active high drive to 6V

– Open drain with the ability to be pulled up

externally to VDD

? Low power consumption ICC ≈ 1μA (VCELL(ALL) <

VOV)

? Low leakage current per cell input < 100nA with

open wire detection disabled

? Package footprint options:

– Leaded 24-pin TSSOP with 0.65mm lead pitch

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, pedalassist

bicycles)

3 Description

The BQ77216xx family of products provides a range

of voltage and temperature monitoring, including

overvoltage (OVP), undervoltage (UVP), open wire

(OW), undertemperature (UT), and overtemperature

(OT) protection for Li-ion battery pack systems.

Each cell is monitored independently for overvoltage,

undervoltage, and open-wire conditions. With the

addition of an external NTC thermistor, the device

can detect undertemperature and overtemperature

conditions.

In the BQ77216xx device, an internal delay timer

is initiated upon detection of an overvoltage,

undervoltage, open-wire,undertemperature, or

overtemperature condition. Upon expiration of the

delay timer, the respective output is triggered into

its active state (either high or low, depending on the

configuration).

Overvoltage triggers the COUT pin if a fault is

detected, and undervoltage triggers the DOUT pin

if a fault is detected. If an overtemperature or openwire

fault is detected, then the DOUT and COUT

are triggered. For quicker production-line testing, the

BQ77216xx device provides a Customer Test Mode

(CTM) with greatly reduced delay time.