常用芯片数据手册充电bq24753

bq24753

SLUS885A–DECEMBER2008–REVISEDDECEMBER2008

Host-ControlledMulti-ChemistryBatteryChargerwithLowIqandSystemPowerSelector

FEATURES APPLICATIONS

NMOS-NMOSSynchronousBuckConverter NotebookandUltra-MobileComputers

with300kHzFrequencyand>95%Efficiency PortableDataCaptureTerminals

30-nsMinimumDriverDead-timeand99.5% PortablePrinters

MaximumEffectiveDutyCycle MedicalDiagnosticsEquipment

High-AccuracyVoltageandCurrentRegulation

±0.5%ChargeVoltageAccuracy

±3%ChargeCurrentAccuracy

±3%AdapterCurrentAccuracy

±2%InputCurrentSenseAmpAccuracy

Integration

BatteryBayChargers

BatteryBack-upSystems

DESCRIPTION

Thebq24753isahigh-efficiency,synchronousbatterychargerwithintegratedcompensationandsystempowerselectorlogic,offeringlowcomponent

AutomaticSystemPowerSelectionFrom countforspace-constrainedmulti-chemistrybattery

AC/DCAdapterorBattery

InternalLoopCompensation

InternalSoftStart

chargingapplications.Ratiometricchargecurrentandvoltageprogrammingallowsforhighregulationaccuracies,andcanbeeitherhardwiredwithresistorsorprogrammedbythesystempower-management

Safety microcontrollerusingaDACorGPIOs.

ProgrammableInputOvervoltage Thebq24753chargestwo,three,orfourseriesLi+

PVCCBTSTHIDRVPHREGNLODRV

PGND

Protection(OVP) cells,supportingupto10Aofchargecurrent,andis

DynamicPowerManagement(DPM)

ProgrammableInrushAdapterPower(ACOP)andOvercurrent(ACOC)Limits

Reverse-ConductionProtectionInputFET

SupportsTwo,Three,orFourLi+Cells

5–24VAC/DC-AdapterOperatingRange

AnalogInputswithRatiometricProgrammingviaResistorsorDAC/GPIOHostControl

ChargeVoltage(4-4.512V/cell)

ChargeCurrent(upto10A,with10-mΩSenseResistor)

AdapterCurrentLimit(DPM)

StatusandMonitoringOutputs

AC/DCAdapterPresentwithProgrammableVoltageThreshold

CurrentDrawnfromInputSource

BatteryLearnCycleControl

SupportsAnyBatteryChemistry:Li+,NiCd,NiMH,LeadAcid,etc.

ChargeEnable

28-pin,5x5-mmQFNpackage

EnergyStarLowIq

<10AOff-StateBatteryDischargeCurrent

<1.5mAOff-StateInputQuiescentCurrent

availableina28-pin,5x5-mmthinQFNpackage.

28272625242322

CHGEN

ACNACPACDRVACDETACSET

ACOP

1

2

21

20

3

bq24753

28LDQFNTOPVIEW

19

4

5

6

18

17

16

7

15

891011121314

OVPSETAGNDVREFVDACVADJACGOOD

BATDRV

LEARNCELLSSRPSRNBATSRSETIADAPT

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate. Copyright©2008,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnotnecessarilyincludetestingofallparameters.

bq24753

SLUS885A–DECEMBER2008–REVISEDDECEMBER2008

bq24753

SLUS885A–DECEMBER2008–REVISEDDECEMBER2008

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Thesedeviceshavelimitedbuilt-inESDprotection.TheleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoamduringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.

DESCRIPTION(CONTINUED)

Thebq24753controlsexternalswitchestopreventbatterydischargebacktotheinput,connecttheadaptertothesystem,andtoconnectthebatterytothesystemusing6-Vgatedrivesforbettersystemefficiency.Formaximumsystemsafety,inrush-powerlimitingprovidesinstantaneousresponsetohighinputvoltagemultipliedbycurrent.ThisACOverpowerprotection(ACOP)featurelimitstheinput-switchpowertotheprogrammedlevelontheACOPpin,andlatchesoffifthehigh-powerconditionpersiststopreventoverheating.

Thebq24753featuresDynamicPowerManagement(DPM)andinputpowerlimiting.ThesefeaturesreducebatterychargecurrentwhentheinputpowerlimitisreachedtoavoidoverloadingtheACadapterwhensupplyingtheloadandthebatterychargersimultaneously.Ahighly-accuratecurrent-senseamplifierenablesprecisemeasurementofinputcurrentfromtheACadaptertomonitortheoverallsystempower.

ADAPTER+

ADAPTER-

/ACGOOD

SYSTEM

R10

2Ω P

Q1(ACFET)SI4435

P

Q2(ACFET)SI4435

Rac

0.010Ω

C6 C710µF10µF

C1

2.2µF

C2

0.1µF

C3

ACN

0.1µF

PVCC

ACP

C8

0.1µF

ACDRV

BATDRV

R1

ACDET

Q3(BATFET)SI4435

432kΩ

1%

R2

66.5kΩ

1%

HIDRV

VREF

R510kΩ

AGND

bq24753

PH

Q4FDS6680A

L1

8.2µH

P

Rsr

0.010Ω

BTST

ACGOOD

R3

OVPSET

D1 C9

BAT540.1µF

422kΩ

1%

R471kΩ

1%

REGN

C1110µF

C1210µF

C10

1µF

SRSET

LODRV

ACSET

C13

0.1µF

Q5

FDS6680A C14

0.1µF

VREF

PGND

HOST

C4

1µF

SRP

LEARN

SRN

CELLS

BAT

CHGEN

ACOP

C15

0.1µF

VDAC

DAC

VADJ

C16

0.47µF

IADAPT

PowerPad

C5100pF

ADC

GPIO

DAC

N

PACK+PACK-

N

Pull-uprailcouldbeeitherVREForothersystemrail.

SRSET/ACSETcouldcomefromeitherDACorresistordividers.VIN=20V,VBAT=3-cellLi-Ion,Icharge=3A,Iadapter_limit=3.5A

Figure1.TypicalSystemSchematic,VoltageandCurrentProgrammedbyDAC

ADAPTER+

ADAPTER-

SYSTEM

ACGOOD

N

N

PACK+PACK-

HOST

GPIO

ADC

R10

2Ω

P

Q1(ACFET)SI4435

P

Q2(ACFET)SI4435

Rac

0.010Ω

C6 C710F10F

C1

2.2µF

C2 C3

0.1F ACN

0.1F

PVCC

ACP

C8

0.1F

ACDRV

R1

BATDRV

ACDET

Q3(BATFET)SI4435

432kΩ

1%

R2

66.5kΩ

1%

P

HIDRV

VREF

R510kΩ

AGND

bq24753

PH

Q4FDS6680A

L1

8.2H

Rsr

0.010Ω

ACGOOD

BTST

R3

D1BAT54

422k

1%

VREF

VREF

OVPSET

C9

0.1F

C11

R4

71k

1%

REGN

10F

C1210F

R11

R7

100k

C10

1F

R8

100k

R9

33.6k

SRSET

43kΩ

LODRV

ACSET

C13

0.1F

Q5

FDS6680A

C14

0.1F

VREF

PGND

C4

1F

SRP

LEARN

SRN

CELLS

BAT

CHGEN

VREF

ACOP

C15

0.1F

VDAC

REGN

VADJ

C16

0.47F

IADAPT

PowerPad

C5100pF

Pull-uprailcouldbeeitherVREForothersystemrail.

SRSET/ACSETcouldcomefromeitherDACorresistordividers.VIN=20V,VBAT=3-cellLi-Ion,Icharge=3A,Iadapter_limit=3.5A

Figure2.TypicalSystemSchematic,VoltageandCurrentProgrammedbyResistor

ORDERINGINFORMATION

PARTNUMBER

PACKAGE

ORDERINGNUMBER

(TapeandReel)

QUANTITY

bq24753

28-PIN5x5mmQFN

bq24753RHDR

3000

bq24753RHDT

250

PACKAGETHERMALDATA

PACKAGE

JA

TA=70°CPOWERRATING

DERATINGFACTORABOVETA=25°C

QFN–RHD(1)(2)

39°C/W

2.36W

0.028W/°C

Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTIWebsiteat

.

ThisdataisbasedonusingtheJEDECHigh-KboardandtheexposeddiepadisconnectedtoaCupadontheboard.Thisisconnectedtothegroundplanebya2x3viamatrix.

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bq24753

SLUS885A–DECEMBER2008–REVISEDDECEMBER2008

Table1.PINFUNCTIONS–28-PINQFN

PIN

DESCRIPTION

NAME

NO.

CHGEN

1

Chargeenableactive-lowlogicinput.LOenablescharge.HIdisablescharge.

ACN

2

Adaptercurrentsenseresistor,negativeinput.A0.1-FceramiccapacitorisplacedfromACNtoACPtoprovidedifferential-modefiltering.Anoptional0.1-FceramiccapacitorisplacedfromACNpintoAGNDforcommon-modefiltering.

ACP

3

Adaptercurrentsenseresistor,positiveinput.A0.1-FceramiccapacitorisplacedfromACNtoACPtoprovidedifferential-modefiltering.A0.1-FceramiccapacitorisplacedfromACPpintoAGNDforcommon-modefiltering.

ACDRV

4

ACadaptertosystem-switchdriveroutput.ConnectdirectlytothegateoftheACFETP-channelpowerMOSFETandthereverseconductionblockingP-channelpowerMOSFET.ConnectbothFETsascommon-source.ConnecttheACFETdraintothesystem-loadside.ThePVCCshouldbeconnectedtothecommon-sourcenodetoensurethatthedriverlogicisalwaysactivewhenneeded.Ifneeded,anoptionalcapacitorfromgatetosourceoftheACFETisusedtoslowdowntheONandOFFtimes.Theinternalgatedriveisasymmetrical,allowingaquickturn-offandslowerturn-oninadditiontotheinternalbreak-before-makelogicwithrespecttotheBATDRV.TheoutputgoesintolinearregulationmodewhentheinputsensedcurrentexceedstheACOCthreshold.ACDRVislatchedoffafterACOPvoltageexceeds2V,toprotectthechargingsystemfromanACFET-overpowercondition.

ACDET

5

Adapterdetectedvoltagesetinput.ProgramtheadapterdetectthresholdbyconnectingaresistordividerfromadapterinputtoACDETpintoAGNDpin.AdaptervoltageisdetectedifACDET-pinvoltageisgreaterthan2.4V.TheIADAPTcurrentsenseamplifierisactivewhentheACDETpinvoltageisgreaterthan0.6V.

ACSET

6

Adaptercurrentsetinput.ThevoltageratioofACSETvoltageversusVDACvoltageprogramstheinputcurrentregulationset-pointduringDynamicPowerManagement(DPM).ProgrambyconnectingaresistordividerfromVDACtoACSETtoAGND;orbyconnectingtheoutputofanexternalDACtotheACSETpinandconnecttheDACsupplytotheVDACpin.

ACOP

7

Inputpowerlimitsetinput.ProgramtheinputoverpowertimeconstantbyplacingaceramiccapacitorfromACOPtoAGND.Thecapacitorsetsthetimethattheinputcurrentlimit,ACOC,canbesustainedbeforeexceedingthe

power-MOSFETpowerlimit.WhentheACOPvoltageexceeds2V,thentheACDRVlatchesofftoprotectthechargesystemfromanoverpowercondition,ACOP.ResetlatchbytogglingACDETorPVCC_UVLO.

OVPSET

8

Setinputovervoltageprotectionthreshold.ChargeisdisabledandACDRVisturnedoffifadapterinputvoltageishigherthantheOVPSETprogrammedthreshold.Inputovervoltage,ACOV,disableschargeandACDRVwhenOVPSET>3.1V.ACOVdoesnotlatch.ProgramtheovervoltageprotectionthresholdbyconnectingaresistordividerfromadapterinputtoOVPSETpintoAGNDpin.

AGND

9

Analogground.Groundconnectionforlow-currentsensitiveanaloganddigitalsignals.OnPCBlayout,connecttotheanaloggroundplane,andonlyconnecttoPGNDthroughthePowerPadunderneaththeIC.

VREF

10

3.3-Vregulatedvoltageoutput.Placea1-FceramiccapacitorfromVREFtoAGNDpinclosetotheIC.Thisvoltagecouldbeusedforratiometricprogrammingofvoltageandcurrentregulation.Donotapplyanexternalvoltagesourceonthispin.

VDAC

11

Chargevoltagesetreferenceinput.ConnecttheVREForexternalDACvoltagesourcetotheVDACpin.Batteryvoltage,chargecurrent,andinputcurrentareprogrammedasaratiooftheVDACpinvoltageversustheVADJ,SRSET,andACSETpinvoltages,respectively.PlaceresistordividersfromVDACtoVADJ,SRSET,andACSETpinstoAGNDforprogramming.ADACcouldbeusedbyconnectingtheDACsupplytoVDACandconnectingtheoutputtoVADJ,SRSET,orACSET.

VADJ

12

Chargevoltagesetinput.ThevoltageratioofVADJvoltageversusVDACvoltageprogramsthebatteryvoltageregulationset-point.ProgrambyconnectingaresistordividerfromVDACtoVADJ,toAGND;or,byconnectingtheoutputofanexternalDACtoVADJ,andconnecttheDACsupplytoVDAC.VADJconnectedtoREGNprogramsthedefaultof4.2Vpercell.

ACGOOD

13

Validadapteractive-lowdetectlogicopen-drainoutput.PulledlowwhenInputvoltageisaboveprogrammedACDET.Connecta10-kΩpullupresistorfromACGOODtoVREF,ortoadifferentpullup-supplyrail.

BATDRV

14

Batterytosystemswitchdriveroutput.GatedriveforthebatterytosystemloadBATPMOSpowerFETtoisolatethesystemfromthebatterytopreventcurrentflowfromthesystemtothebattery,whileallowingalowimpedancepathfrombatterytosystemandwhiledischargingthebatterypacktothesystemload.ConnectthispindirectlytothegateoftheinputBATP-channelpowerMOSFET.ConnectthesourceoftheFETtothesystemloadvoltagenode.ConnectthedrainoftheFETtothebatterypackpositivenode.Anoptionalcapacitorisplacedfromthegatetothesourcetoslowdowntheswitchingtimes.Theinternalgatedriveisasymmetricaltoallowaquickturn-offandslowerturn-on,inadditiontotheinternalbreak-before-makelogicwithrespecttoACDRV.

IADAPT

15

Adaptercurrentsenseamplifieroutput.IADAPTvoltageis20timesthedifferentialvoltageacrossACP-ACN.Placea100-pForlessceramicdecouplingcapacitorfromIADAPTtoAGND.

SRSET

16

Chargecurrentsetinput.ThevoltageratioofSRSETvoltageversusVDACvoltageprogramsthechargecurrentregulationset-point.ProgrambyconnectingaresistordividerfromVDACtoSRSETtoAGND;orbyconnectingtheoutputofanexternalDACtoSRSETpinandconnecttheDACsupplytoVDACpin.

BAT

17

Batteryvoltageremotesense.DirectlyconnectakelvinsensetracefromthebatterypackpositiveterminaltotheBATpintoaccuratelysensethebatterypackvoltage.Placea0.1-FcapacitorfromBATtoAGNDclosetotheICtofilterhigh-frequencynoise.

bq24753

SLUS885A–DECEMBER2008–REVISEDDECEMBER2008

Table1.PINFUNCTIONS–28-PINQFN(continued)

PIN

DESCRIPTION

NAME

NO.

SRN

18

Chargecurrentsenseresistor,negativeinput.A0.1-FceramiccapacitorisplacedfromSRNtoSRPtoprovidedifferential-modefiltering.Anoptional0.1-FceramiccapacitorisplacedfromSRNpintoAGNDforcommon-modefiltering.

SRP

19

Chargecurrentsenseresistor,positiveinput.A0.1-FceramiccapacitorisplacedfromSRNtoSRPtoprovidedifferential-modefiltering.A0.1-FceramiccapacitorisplacedfromSRPpintoAGNDforcommon-modefiltering.

CELLS

20

2,3or4cellsselectionlogicinput.Logiclowprograms3cell.Logichighprograms4cell.Floatingprograms2cell.

LEARN

21

Learnmodelogicinputcontrolpin—logichightooverridesystemselectorwhenadapterispresent,thebatteryisdischargedtorecalibratethebattery-packgasgauge.WhenadapterispresentandLEARNishigh,batterychargingisdisabled,theadapterisdisconnected(ACDRVisoff),andthebatteryisconnectedtosystem(BATDRVison).SystemselectorautomaticallyswitchestoadapterifbatteryisdischargedbelowLOWBAT(3V).WhenadapterispresentandLEARNislow,theadapterisconnectedtosysteminnormalselectorlogic(ACDRVisonandBATDRVisoff),allowingbatterycharging.Ifadapterisnotpresent,thebatteryisalwaysconnectedtothesystem(ACDRVisoffandBATDRVison).

PGND

22

Powerground.Groundconnectionforhigh-currentpowerconverternode.OnPCBlayout,connectdirectlytosourceoflow-sidepowerMOSFET,togroundconnectionofinputandoutputcapacitorsofthecharger.OnlyconnecttoAGNDthroughthePowerPadunderneaththeIC.

LODRV

23

PWMlowsidedriveroutput.Connecttothegateofthelow-sidepowerMOSFETwithashorttrace.

REGN

24

PWMlowsidedriverpositive6-Vsupplyoutput.Connecta1-FceramiccapacitorfromREGNtoPGND,closetotheIC.Useforhigh-sidedriverbootstrapvoltagebyconnectingasmall-signalSchottkydiodefromREGNtoBTST.REGNisdisabledwhenCHGENishigh.

PH

25

PWMhighsidedrivernegativesupply.Connecttothephaseswitchingnode(junctionofthelow-sidepowerMOSFETdrain,high-sidepowerMOSFETsource,andoutputinductor).Connectthe0.1-FbootstrapcapacitorfromfromPHtoBTST.

HIDRV

26

PWMhighsidedriveroutput.Connecttothegateofthehigh-sidepowerMOSFETwithashorttrace.

BTST

27

PWMhighsidedriverpositivesupply.Connecta0.1-FbootstrapceramiccapacitorfromBTSTtoPH.ConnectasmallbootstrapSchottkydiodefromREGNtoBTST.

PVCC

28

ICpowerpositivesupply.Connecttothecommon-source(diode-OR)point:sourceofhigh-sideP-channelMOSFETandsourceofreverse-blockingpowerP-channelMOSFET.Placea0.1-FceramiccapacitorfromPVCCtoPGNDpinclosetotheIC.

PowerPad

ExposedpadbeneaththeIC.AGNDandPGNDstar-connectedonlyatthePowerPadplane.AlwayssolderPowerPadtotheboard,andhaveviasonthePowerPadplaneconnectingtoAGNDandPGNDplanes.Italsoservesasathermalpadtodissipatetheheat.

ABSOLUTEMAXIMUMRATINGS

overoperatingfree-airtemperaturerange(unlessotherwisenoted)(1)(2)

VALUE

UNIT

Voltagerange

PVCC,ACP,ACN,SRP,SRN,BAT,BATDRV,ACDRV

–0.3to30

V

PH

–1to30

REGN,LODRV,VREF,VDAC,VADJ,ACSET,SRSET,ACDET,ACOP,CHGEN,CELLS,STAT,ACGOOD,LEARN,OVPSET

–0.3to7

VREF,IADAPT

–0.3to3.6

BTST,HIDRVwithrespecttoAGNDandPGND

–0.3to36

Maximumdifferencevoltage

ACP–ACN,SRP–SRN,AGND–PGND

–0.5to0.5

V

Junctiontemperaturerange,TJ

–40to155

°C

Storagetemperaturerange,Tstg

–55to155

Stressesbeyondthoselistedunderabsolutemaximumratingsmaycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderrecommendedoperatingconditionsisnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.

AllvoltagesarewithrespecttoGNDifnotspecified.Currentsarepositiveinto,negativeoutofthespecifiedterminal.ConsultPackagingSectionofthedatabookforthermallimitationsandconsiderationsofpackages.

bq24753

SLUS885A–DECEMBER2008–REVISEDDECEMBER2008

ELECTRICALCHARACTERISTICS(continued)

7V≤VPVCC≤24V,0°C<TJ<125°C,typicalvaluesareatTA=25°C,withrespecttoAGND(unlessotherwisenoted)

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bq24753

SLUS885A–DECEMBER2008–REVISEDDECEMBER2008

RECOMMENDEDOPERATINGCONDITIONS

overoperatingfree-airtemperaturerange(unlessotherwisenoted)

MIN

NOM

MAX

UNIT

Voltagerange

PH

–1

24

V

PVCC,ACP,ACN,SRP,SRN,BAT,BATDRV,ACDRV

0

24

V

REGN,LODRV

0

6.5

V

VDAC,IADAPT

0

3.6

V

VREF

3.3

V

ACSET,SRSET,TS,ACDET,ACOP,CHGEN,CELLS,ACGOOD,LEARN,OVPSET

0

5.5

V

VADJ

0

6.5

V

BTST,HIDRVwithrespecttoAGNDandPGND

0

30

V

AGND,PGND

–0.3

0.3

V

Maximumdifferencevoltage

ACP–ACN,SRP–SRN

–0.3

0.3

V

Junctiontemperaturerange,TJ

–40

125

°C

Storagetemperaturerange,Tstg

–55

150

ELECTRICALCHARACTERISTICS

7V≤VPVCC≤24V,0°C<TJ<125°C,typicalvaluesareatTA=25°C,withrespecttoAGND(unlessotherwisenoted)

PARAMETER

TESTCONDITIONS

MIN

TYP

MAX

UNIT

OPERATINGCONDITIONS

VPVCC_OP

PVCCInputvoltageoperatingrange

5

24

V

CHARGEVOLTAGEREGULATION

VBAT_REG_RNG

BATvoltageregulationrange

4-4.512Vpercell,times2,3,4cells

8

18.048

V

VVDAC_OP

VDACreferencevoltagerange

2.6

3.6

V

VADJ_OP

VADJvoltagerange

0

REGN

V

Chargevoltageregulationaccuracy

8V,8.4V,9.024V

–0.5%

0.5%

12V,12.6V,13.536V

–0.5%

0.5%

16V,16.8V,18.048V

–0.5%

0.5%

Chargevoltageregulationsettodefaultto4.2Vpercell

VADJconnectedtoREGN,8.4V,12.6V,16.8V

–0.5%

0.5%

CHARGECURRENTREGULATION

VIREG_CHG

Chargecurrentregulationdifferentialvoltagerange

VIREG_CHG=VSRP–VSRN

0

100

mV

VSRSET_OP

SRSETvoltagerange

0

VDAC

V

Chargecurrentregulationaccuracy

VIREG_CHG=40–100mV

–3%

3%

VIREG_CHG=20mV

–5%

5%

VIREG_CHG=5mV

–25%

25%

VIREG_CHG=1.5mV(VBAT>4V)

–33%

33%

INPUTCURRENTREGULATION

VIREG_DPM

Adaptercurrentregulationdifferentialvoltagerange

VIREG_DPM=VACP–VACN

0

100

mV

DPMsettledowntimeTimeforchargecurrentdropsfrom90%

to10%ofsettingduringDPM

IREG_CHG=3A

100

s

VACSET_OP

ACSETvoltagerange

0

VDAC

V

Inputcurrentregulationaccuracy

VIREG_DPM=40–100mV

–3%

3%

VIREG_DPM=20mV

–5%

5%

VIREG_DPM=5mV

–25%

25%

VIREG_DPM=1.5mV

–33%

33%

VREFREGULATOR

VVREF_REG VREFregulatorvoltage

VACDET>0.6V,0-30mA

3.267

3.3

3.333

V

IVREF_LIM

VREFcurrentlimit

VVREF=0V,VACDET>0.6V

35

80

mA

PARAMETER

TESTCONDITIONS

MIN

TYP

MAX

UNIT

REGNREGULATOR

VREGN_REG

REGNregulatorvoltage

VACDET>0.6V,0-75mA,PVCC>10V

5.6

5.9

6.2

V

IREGN_LIM

REGNcurrentlimit

VREGN=0V,VACDET>0.6V

90

135

mA

ADAPTERCURRENTSENSEAMPLIFIER

VACP/N_OP

Inputcommonmoderange

VoltageonACP/ACN

0

24

V

VIADAPT

IADAPToutputvoltagerange

0

2

IIADAPT

IADAPToutputcurrent

0

1

mA

AIADAPT

Currentsenseamplifiervoltagegain

AIADAPT=VIADAPT/VIREG_DPM

20

V/V

Adaptercurrentsenseaccuracy

VIREG_DPM=40–100mV

–2%

2%

VIREG_DPM=20mV

–3%

3%

VIREG_DPM=5mV

–25%

25%

VIREG_DPM=1.5mV

–33%

33%

IIADAPT_LIM

Outputcurrentlimit

VIADAPT=0V

1

mA

CIADAPT_MAX

Maximumoutputloadcapacitance

Forstabilitywith0mAto1mAload

100

pF

ACDETCOMPARATOR

VACDET_CHG

ACDETadapter-detectrisingthreshold

Minvoltagetoenablecharging,VACDETrising

2.376

2.40

2.424

V

VACDET_CHG_HYS

ACDETfallinghysteresis

VACDETfalling

40

mV

deglitchtimeafterVACDETrising

VACDETrisingabove2.4V

518

700

908

ms

deglitchtimeafterVACDETfalling

VACDETfallingbelow2.4V

7

9

11

ms

VACDET_BIAS

ACDETenable-biasrisingthreshold

Minvoltagetoenableallbias,VACDETrising

0.56

0.62

0.68

V

VACDET_BIAS_HYS

Adapterpresentfallinghysteresis

VACDETfalling

20

mV

ACDET_BIASrisingdeglitch

VACDETrisingabove0.62V

10

s

ACDET_BIASfallingdeglitch

VACDETfallingbelow0.62V

10

s

PVCC/BATCOMPARATOR

VPVCC-BAT_OP

DifferentialVoltagefromPVCCtoBAT

–20

24

V

VPVCC-BAT_FALL

PVCCtoBATfallingthreshold

VPVCC–VBATtoturnoffACFET

140

185

240

mV

VPVCC-BATHYS

PVCCtoBAThysteresis

50

mV

PVCCtoBATRisingDeglitch

VPVCC–VBAT>VPVCC-BAT_RISE

7

9

11

ms

PVCCtoBATFallingDeglitch

VPVCC–VBAT<VPVCC-BAT_FALL

6

s

OPEN-DRAINLOGICOUTPUTPINCHARACTERISTICS(ACGOOD)

VOUT_LO

Outputlowsaturationvoltage

SinkCurrent=5mA

0.5

V

Delaybetweensystempowerselector(ACDRVandBATDRV)switchingandACGOODedge

10

s

INPUTUNDERVOLTAGELOCK-OUTCOMPARATOR(UVLO)

UVLO

ACUndervoltagerisingthresholdtoexitUVLO

MeasuredonPVCC

3.5

4

4.5

V

UVLO(HYS)

ACUndervoltagehysteresis,falling

260

mV

ACLOWVOLTAGECOMPARATOR(ACLOWV)

VACLOWV

AClowvoltagerisingthreshold

AClowvoltagefallingthreshold

MeasureonACPpin

3.6

V

3

ACN/BATCOMPARATOR

VACN-BAT_FALL ACNtoBATfallingthreshold

VACN–VBATtoturnonBATDRV

175

285

340

mV

VACN-BAT_HYS

ACNtoBAThysteresis

50

mV

ACNtoBATrisingdeglitch

VACN–VBAT>VACN-BAT_RISE

20

s

ACNtoBATfallingdeglitch

VACN–VBAT<VACN-BAT_FALL

6

s

BATOVERVOLTAGECOMPARATOR

VOV_RISE Overvoltagerisingthreshold

AspercentageofVBAT_REG

104%

VOV_FALL

Overvoltagefallingthreshold

AspercentageofVBAT_REG

102%

bq24753

SLUS885A–DECEMBER2008–REVISEDDECEMBER2008

ELECTRICALCHARACTERISTICS(continued)

7V≤VPVCC≤24V,0°C<TJ<125°C,typicalvaluesareatTA=25°C,withrespecttoAGND(unlessotherwisenoted)

PARAMETER

TESTCONDITIONS

MIN

TYP

MAX

UNIT

BATSHORT(UNDERVOLTAGE)COMPARATOR

VBAT_SHORT_FALL

VBATfallingthresholdtobeginC/8charge

VBATfalling

2.29

2.41

2.53

V/cell

VBAT_SHORT_HYS

BATSHORThysteresis

VBATrising

330

360

390

mV/cell

DeglitchtimeofVBATrisingtoresumefullcharge

VBAT>VBAT_SHORT+VBAT_SHORT_HYS

1.5

s

DeglitchtimeofVBATfallingtobeginC/8charge

VBAT<VBAT_SHORT

1.5

BATSHORTEXITdelaytoturnonBATFETandturnoffACFETwhenLEARN=HIGH

600

ms

BATSHORTENTRYdelaytoturnoffBATFETandturnonACFETwhenLEARN=HIGH

10

s

CHARGEOVERCURRENTCOMPARATOR

VOC Chargeovercurrentfallingthreshold

AspercentageofIREG_CHG

145%

OCPFloor

MinimumCurrentLimit(SRP-SRN)

50

mV

OCPThreshold

fallingthreshold

0.1×SRSET/VDACfalling

33.75

mV

risingthreshold

0.1×SRSET/VDACrising

42.5

mV

CHARGEUNDERCURRENTCOMPARATOR(SYNCHRONOUSTONON-SYNCHRONOUSTRANSITION)

VISYNSET_FALL Chargeundercurrentfallingthreshold

Changingfromsynchronoustonon-synchronous

9.75

13

16.25

mV

VISYNSET_HYS

Chargeundercurrentrisinghysteresis

8

mV

Chargeundercurrent,falling-currentdeglitch

VIREG_DPM<VISYNSET

20

s

Chargeundercurrent,rising-currentdeglitch

640

INPUTOVERPOWERCOMPARATOR(ACOP)

VACOC

ACOCGainforinitialACOCcurrentlimit(PercentageofprogrammedVIREG_DPM)

Begins700msafterACDET,VACSET=1VInputcurrentlimitedtothisthresholdforfaultprotection

250

265

283

%VIREG_DPM

VACOC_CEILING

MaximumACOCinputcurrentlimit(VACP–VACN)max

Internallylimitedceiling,VACOC_MAX=(VACP–VACN)max

100

mV

ACOPLatchBlankoutTimewithACOCactive

(begins700msafterACDET)

Begins700msafterACDET

(doesnotallowACOPlatch-off,andnoACOPsourcecurrent)

2

ms

VACOP

ACOPpinlatch-offthresholdvoltage(SeeACOPinTerminalFunctionstable)

1.95

2

2.05

V

KACOP

GainforACOPSourceCurrentwheninACOC

CurrentsourceonwheninACOClimit.FunctionofvoltageacrosspowerFET

IACOP_SOURCE=KACOP×(VPVCC-VACP)

18

A/V

IACOP_SINK

ACOPSinkCurrentwhennotinACOCACOPLatchisresetbygoingbelowACDETorUVLO

CurrentsinkonwhennotinACOC

5

A

VACN-SHORT

ACNShortprotectionthresholdlatching

ACN<2.4V,ACDET>2.4V

2.4

V

INPUTOVERVOLTAGECOMPARATOR(ACOV)

VACOV

ACOvervoltagerisingthresholdonOVPSET

(SeeOVPSETinTable1)

MeasuredonOVPSET

3.007

3.1

3.193

V

VACOV_HYS

ACOvervoltagerisingdeglitch

1.3

ms

ACOvervoltagefallingdeglitch

1.3

THERMALSHUTDOWNCOMPARATOR

TSHUT Thermalshutdownrisingtemperature

TemperatureIncreasing

155

°C

TSHUT_HYS

Thermalshutdownhysteresis,falling

20

°C

BATTERYSWITCH(BATDRV)DRIVER

RDS(off)_BAT BATFETTurn-offresistance

VACN>5V

160

Ω

RDS(on)_BAT

BATFETTurn-onresistance

VACN>5V

3

kΩ

PARAMETER

TESTCONDITIONS

MIN

TYP

MAX

UNIT

VBATDRV_REG

BATFETdrivevoltage

VBATDRV_REG=VACN–VBATDRVwhen

VACN>5VandBATFETison

6.5

V

BATFETPower-updelay

DelaytoturnoffBATFETafteradapterisdetected(afterVACDET>2.4V)

518

700

908

ms

ACSWITCH(ACDRV)DRIVER

RDS(off)_AC

ACFETturn-offresistance

VPVCC>5V

80

Ω

RDS(on)_AC

ACFETturn-onresistance

VPVCC>5V

2.5

kΩ

VACDRV_REG

ACFETdrivevoltage

VACDRV_REG=VPVCC–VACDRVwhen

VPVCC>5VandACFETison

6.5

V

ACFETPower-upDelay

DelaytoturnonACFETafteradapterisdetected(afterVACDET>2.4V)

518

700

908

ms

AC/BATMOSFETDRIVERSTIMING

Driverdeadtime

DeadtimewhenswitchingbetweenACDRVandBATDRV

10

s

PWMHIGHSIDEDRIVER(HIDR