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GND

OUT

VDD

CD

VC4

VC1

VC3

1

2VC2

3

45

6

7

8

DCTPACKAGE

(TOPVIEW)

1

2

3

4

8

7

6

5

VC1

VC2

VC3

GND

OUT

VDD

CD

VC4

PWP

ACKAGE

(TOPVIEW)

bq29410,bq29411,bq29412

bq29413,bq29414

bq29415,bq29419

www.ti.com

SLUS669G–AUGUST2005–REVISEDAUGUST2008

VOLTAGEPROTECTIONFOR2-,3-,OR4-CELLLi-IonBATTERIES

(2

nd

-LEVELPROTECTION)

CheckforSamples:bq29410,bq29411,bq29412,bq29413,bq29414,bq29415,bq29419

1

FEATURESDESCRIPTION

Thebq2941xisasecondaryovervoltageprotection

•2-,3-,or4-CellSecondaryProtection

ICfor2-,3-,or4-celllithium-ionbatterypacksthat

•LowPowerConsumptionI

CC

<2µA

incorporatesahigh-accuracyprecisionovervoltage

[VCELL

(ALL)

<V

(PROTECT)

]

detectioncircuit.Itincludesaprogrammabledelay

•FixedHighAccuracyOvervoltageProtection

circuitforovervoltagedetectiontime.

Threshold

FUNCTION

–bq29410=4.35V

Eachcellinamultiple-cellpackiscomparedtoan

–bq29411=4.40V

internalreferencevoltage.Ifonecellreachesan

–bq29412=4.45V

overvoltagecondition,theprotectionsequence

–bq29413=4.50V

begins.Thebq2941xdevicestartschargingan

externalcapacitorthroughtheCDpin.WhentheCD

–bq29414=4.55V

pinvoltagereaches1.2V,theOUTpinchangesfrom

–bq29415=4.60V

alowleveltoahighlevel.

–bq29419=4.30V

•ProgrammableDelayTimeofDetection

•HighPowerSupplyRippleRejection

•StableDuringPulseChargeOperation

APPLICATIONS

•2

nd

-LevelOvervoltageProtectioninLi-Ion

BatteryPacksin:

–NotebookComputers

–PortableInstrumentation

–PortableEquipment

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2005–2008,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Produktspecifikationer