100

VCELL1

VCELL3

VCELL2

OUT

VDD

VSS

0. 1 µF

1k

1k

Pack+

Pack–

V3

V2

V1

V4

CD

VCELL4

PWPD

0. 1 µF

0.1 µF

0.1 µF

0.1 µF

1k

1k

0.1 µF

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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.

bq2947

SLUSB15F – SEPTEMBER 2012 – REVISED JANUARY 2017

bq2947 Overvoltage Protection for 2-Series to 4-Series Cell Li-Ion Batteries

with External Delay Capacitor

1

1 Features

1

•

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

•

External Capacitor-Programmed Delay Timer

•

Factory Programmed OVP Threshold (Threshold

Range 3.85 V to 4.6 V)

•

Output Options: Active High or Open Drain Active

Low

•

High-Accuracy Overvoltage Protection: ±10 mV

•

•

Low Leakage Current Per Cell Input < 100 nA

•

Small Package Footprint

–

8-Pin WSON (2.00 mm x 2.00 mm)

2 Applications

•

Notebook

•

UPS Battery Backup

3 Description

The bq2947 family is an overvoltage monitor and

protector for Li-Ion battery pack systems. Each cell is

monitored independently for an overvoltage condition.

In the bq2947 device, an external 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). The external

delay timer feature also includes the ability to detect

an open or shorted delay capacitor on the CD pin,

which will similarly trigger the output driver in an

overvoltage condition.

For quicker production-line testing, the bq2947 device

provides a Customer Test Mode with reduced delay

time.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

bq294700

WSON (8)

2.00 mm × 2.00 mm

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

the end of the data sheet.

spacer

Simplified Schematic