1

3

2

6

4

5

7

8

VDD

V3

V2

V4

OUT

VSS

V1

CD

bq294700, bq294701, bq294702

bq294703, bq294704, bq294705

bq294707

www.ti.com

SLUSB15A – SEPTEMBER 2012 – REVISED SEPTEMBER 2013

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

with External Delay Capacitor

Check for Samples: bq294700, bq294701, bq294702, bq294703, bq294704, bq294705, bq294707

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FEATURES

APPLICATIONS

•

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

•

Notebook

•

External Capacitor-Programmed Delay Timer

•

UPS Battery Backup

•

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 SON (2 mm x 2 mm)

DESCRIPTION

The bq2947xy family of products is an overvoltage monitor and protector for Li-Ion battery pack systems. Each

cell is monitored independently for an overvoltage condition.

In the bq2947xy 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 bq2947xy device provides a Customer Test Mode with reduced delay

time.

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

UNLESS

OTHERWISE

NOTED

this

document

contains

Copyright © 2012–2013, Texas Instruments Incorporated

PRODUCTION DATA information current as of publication date.

Products conform to specifications per the terms of Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.