1 Features

? 3-series cell to 16-series cell protection

? High-accuracy overvoltage protection

– ± 10 mV at 25°C

– ± 20 mV from 0°C to 60°C

? Overvoltage protection options from 3.55 V to

5.1 V

? Undervoltage protection with options from 1.0 V to

3.5 V

? Open-wire connection detection

? Overtemperature 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 6 V

– Open drain with the ability to be pulled up

externally to VDD

? Low power consumption ICC ≈ 1 μA

(VCELL(ALL) < VOV)

? Low leakage current per cell input < 100 nA with

open wire detection disabled

? Package footprint options:

– Leaded 24-pin TSSOP with 0.65-mm 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 BQ77216 family of products provides a range

of voltage and temperature monitoring, including

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

(OW), and overtemperature (OT) protection for Liion

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

overtemperature conditions.

In the BQ77216 device, an internal delay timer

is initiated upon detection of an overvoltage,

undervoltage, open-wire, 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).