OUT

V3

V1

V2

VSS

VDD

RVD

CVD

CIN

VOV

OSC

Delay

Timer

PACK+

PACK–

INT_EN

REG

V4

RIN

V5

RIN

RIN

RIN

RIN

CIN

CIN

CIN

CIN

Copyright © 2016, Texas Instruments Incorporated

Product

Folder

Order

Now

Technical

Documents

Tools &

Software

Support &

Community

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. UNLESS OTHERWISE NOTED, this document contains PRODUCTION

DATA.

bq7718

SLUSAX1E – DECEMBER 2012 – REVISED MARCH 2017

bq7718 Overvoltage Protection for 2-Series to 5-Series Cell Li-Ion Batteries

with Internal Delay Timer

1

1 Features

1

•

2-, 3-, 4-, and 5-Series Cell Overvoltage

Protection

•

Internal Delay Timer

•

Fixed OVP Threshold

•

High-Accuracy Overvoltage Protection:

± 10 mV

•

•

Low Leakage Current Per Cell Input < 100 nA

•

Small Package Footprint

–

8-pin QFN (3.00 mm × 4.00 mm)

2 Applications

•

Protection in Li-Ion Battery Packs in:

–

Power Tools

–

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 production-

line

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).

Device Information Table(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

bq771800

WSON (8)

3.00 mm × 4.00 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet and the Device Comparison Table.

Block Diagram