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1 Features

? 3-series cell to 7-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 using NTC or PTC

? 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 ability to be pulled up

externally to VDD

? Low power consumption ICC is approximately 1μA

(VCELL(ALL) < VOV)

? Low leakage current per cell input < 100nA with

open-wire detection disabled

? Package footprint option

– 12-pin WSON with 0.5mm 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, pedal

assist bicycles)

3 Description

The BQ77207 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 or PTC thermistor, the device can detect

overtemperature conditions.

In the BQ77207 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).

The 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 open-wire

fault is detected, then both the DOUT and COUT

will be triggered. For quicker production-line testing,

the BQ77207 device provides a Customer Test Mode

(CTM) with greatly reduced delay time.