矽力杰 Silergy SY8884A 2.5-5.5V 输入 4A 输出高效同步降压稳压器 规格书 (Datasheet)佰祥电子

SY8884A

HighEfficiency,1MHz,4A

SynchronousStepDownRegulator

GeneralDescriptionFeatures

TheSY8884Aisahighefficiency1MHz2.5Vto5.5VInputVoltageRange

synchronousstepdownDC/DCregulator,whichis55μALowQuiescentCurrent

capableofdeliveringupto4Aoutputcurrent.ItcanLowRDS(ON)forInternalSwitches

operateoverawideinputvoltagerangefrom2.5Vto(Top/Bottom):85mΩ/60mΩ

5.5VandintegratemainswitchandsynchronousHighSwitchingFrequency1MHzMinimizes

switchwithverylowRDS(ON)tominimizethetheExternalComponents

conductionloss.InternalSoft-startLimitstheInrushCurrent

100%DropoutOperation

Thelowoutputvoltageripple,thesmallexternal

PowerGoodIndicator

inductorandthecapacitorsizesareachievedwith

Hic-cupforShortCircuitProtection

1MHzswitchingfrequency.

OutputAutoDischargeFunction

RoHSCompliantandHalogenFree

OrderingInformationCompactPackage:DFN2×2-8

SY8884□(□□)□

TemperatureCodeApplications

PackageCode

OptionalSpecCodeSetTopBox

USBDongle

OrderingNumberPackagetypeNoteMediaPlayer

SY8884ADFCDFN2×2-8--SmartPhone

TypicalApplication

L1:1.0µH

VIN:2.5-5.5VVOUT:1.8VEfficiencyvs.OutputCurrent

INLX

(IOUT=0A~4A,L=1.0μH/CSAB0420-1R0M)

CINRPGRHCFF100

COUT1COUT2

10μF/10V100k100k10pF22μF/6.3V10μF/6.3V

PGFB

95

RL

ON/OFFEN49.9k

PGNDSGND90

85

Figure1.TypicalApplicationCircuit

Efficiency(%)Efficiency80

InductorandCOUTSelectionTableVIN=3.3V,VOUT=1.8V

C[µF]VIN=4.2V,VOUT=1.8V

OUTV=5.0V,V=1.8V

VOUT[V]L[µH]1022324475INOUT

1.0√√☆

1.270

1.5√√0.0010.010.1110

1.0√☆√

1.8OutputCurrent(A)

1.5√√√

1.0√☆√

3.3

1.5√√√Figure2.Efficiencyvs.OutputCurrent

Note:‘☆’meansrecommendedformostapplications.

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SY8884A

Pinout(TopView)

FB18SGND

PG27EN

PGND

IN36LX

PGND45NC

(DFN2×2-8)

TopMark:t2xyz(devicecode:t2,x=yearcode,y=weekcode,z=lotnumbercode)

PinNamePinNo.PinDescription

Outputfeedbackpin.Connectthispintothecenterpointoftheoutputresistor

FB1

divider(asshowninFigure1)toprogramtheoutputvoltage:VOUT=0.6×(1+RH/RL).

Powergoodindicator(opendrainoutput).Lowiftheoutput<90%orthe

PG2output>120%ofregulationvoltage;Highotherwise.Connectapull-upresistorto

theinput.

IN3Inputpin.DecouplethispintoGNDpinwithatleasta10µFceramiccapacitor.

4/Exposed

PGNDPowergroundpin.

Paddle

NC5Noconnection.

LX6Inductorpin.Connectthispintotheswitchingnodeofinductor.

EN7Enablecontrol.Pullhightoturnon.Donotleaveitfloating.

SGND8Analoggroundpin.

BlockDiagram

IN

Current

InternalInputSense

PowerUVLO

EN

LX

1.2V

0.6V

Control

FBLogicGND

OVP

120%VREF

SoftThermal

StartDetect

PG

Figure3.BlockDiagram

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SY8884A

AbsoluteMaximumRatings(Note1)

SupplyInputVoltage------------------------------------------------------------------------------------------------0.3Vto6.0V

FB,EN,PGVoltage------------------------------------------------------------------------------------------0.3VtoVIN+0.6V

LXVoltage------------------------------------------------------------------------------------------0.3V(*1)to6.0V(*2)

PowerDissipation,PD@TA=25°C----------------------------------------------------------------------------------------1.4W

PackageThermalResistance(Note2)

θJA----------------------------------------------------------------------------------------------------------------70°C/W

JC-----------------------------------------------------------------------------------------------------------------25°C/W

JunctionTemperatureRange--------------------------------------------------------------------------------------40°Cto150°C

LeadTemperature(Soldering,10sec.)---------------------------------------------------------------------------------260°C

StorageTemperatureRange------------------------------------------------------------------------------------65°Cto150°C

(*1)LXVoltageTestedDownto-3V<20ns

(*2)LXVoltageTestedUpto+7V<20ns

RecommendedOperatingConditions(Note3)

SupplyInputVoltage---------------------------------------------------------------------------------------------2.5Vto5.5V

JunctionTemperatureRange-----------------------------------------------------------------------------------40°Cto125°C

AmbientTemperatureRange------------------------------------------------------------------------------------40°Cto85°C

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SY8884A

ElectricalCharacteristics

(VIN=5V,VOUT=1.8V,L=1.0µH,COUT=32µF,TA=25°C,unlessotherwisespecified)

ParameterSymbolTestConditionsMinTypMaxUnit

InputVoltageRangeVIN2.55.5V

InputUVLOThresholdVUVLO2.452.5V

InputUVLOHysteresisVHYS150mV

QuiescentCurrentIQVFB=105%×VREF55µA

ShutdownCurrentISHDNVEN=0V0.11µA

FeedbackReferenceVoltageVREFIOUT=0.5A,CCM0.5910.60.609V

LXNodeDischargeResistanceRDIS50Ω

TopFETRONRDS(ON)185mΩ

BottomFETRONRDS(ON)260mΩ

ENInputVoltageHighVEN,H1.2V

ENInputVoltageLowVEN,L0.4V

ENLeakageCurrentIEN2µA

PGThresholdforUnderVoltage

V90%

DetectionPG,UVP

PGLowDelayTimeforUnder

t10us

VoltageDetectionUVP,DLY

PGThresholdforOverVoltage

V120%

DetectionPG,OVP

PGLowDelayTimeforOver

t20us

VoltageDetectionOVP,DLY

MinONTimetON,MIN50ns

MaximumDutyCycleDMAX100%

fromENhightoLXstart

TurnonDelayTimet0.5ms

ON,DLYswitching

Soft-startTimetSSVOUTfrom0%to100%1ms

SwitchingFrequencyfSWIOUT=0.5A,CCM1.0MHz

TopFETCurrentLimitILMT,TOP4.7A

OutputUnderVoltageProtection

V50%V

ThresholdUVPREF

OutputUVPDelaytUVP,DLY10µs

UVPHic-cupONTimetUVP,ON3.5ms

UVPHic-cupOFFTimetUVP,OFF3.5ms

ThermalShutdownTemperatureTSD160°C

ThermalShutdownHysteresisTHYS20°C

Note1:Stressesbeyondthe“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Theseare

stressratingsonly.Functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedinthe

operationalsectionsofthespecificationisnotimplied.Exposuretoabsolutemaximumratingconditionsfor

extendedperiodsmayaffectdevicereliability.

o

Note2:θJAofSY8884ADFCismeasuredinthenaturalconvectionatTA=25Cona2-oztwo-layerSilergy

evaluationboard.PaddleofDFN2×2-8packageisthecasepositionforθJCmeasurement.

Note3:Thedeviceisnotguaranteedtofunctionoutsideitsoperatingconditions.

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SY8884A

TypicalPerformanceCharacteristics

(TA=25°C,VIN=5V,VOUT=1.8V,L=1.0µH,COUT=32µF,unlessotherwisenoted)

Efficiencyvs.OutputCurrentEfficiencyvs.OutputCurrent

(IOUT=0A~4A,L=1.0μH/CSAB0420-1R0M)

(IOUT=0A~4A,L=1.0μH/CSAB0420-1R0M)

100100

95

95

90

90

85

8085

75

Efficiency(%)Efficiency

Efficiency(%)Efficiency80

VIN=3.3V,VOUT=1.2VVIN=3.3V,VOUT=1.8V

V=4.2V,V=1.8V

70VIN=4.2V,VOUT=1.2VINOUT

75VIN=5.0V,VOUT=1.8V

VIN=5.0V,VOUT=1.2V

65

6070

0.0010.010.11100.0010.010.1110

OutputCurrent(A)OutputCurrent(A)

Efficiencyvs.OutputCurrentOutputRipple

(IOUT=0A~4A,L=1.0μH/CSAB0420-1R0M)(VIN=5.0V,VOUT=1.8V,IO=4.0A)

100

VOUT50mV/div

95

VLX5V/div

90

IL2A/div

Efficiency(%)Efficiency

V=4.2V,V=3.3V

85INOUT

VIN=5.0V,VOUT=3.3V

80

0.0010.010.1110

Time(2μs/div)

OutputCurrent(A)

LoadTransientLoadTransient

(VIN=5.0V,VOUT=1.8V,IO=0A~2.0A)(VIN=5.0V,VOUT=1.8V,IO=0.4A~4.0A)

ΔVOUT100mV/div

ΔVOUT100mV/div

IL2A/divIL5A/div

Time(200μs/div)Time(200μs/div)

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SY8884A

StartupfromEnableShutdownfromEnable

(VIN=5.0V,VOUT=1.8V,RLOAD=0.45Ω)(VIN=5.0V,VOUT=1.8V,RLOAD=0.45Ω)

EN2V/divEN2V/div

VOUT1V/divVOUT1V/div

VLX5V/div

VLX5V/div

IL5A/div

IL5A/div

Time(800μs/div)Time(800μs/div)

ShortCircuitProtectionShortCircuitProtection

(VIN=5.0V,VOUT=1.8V,IO=0A~Short)(VIN=5.0V,VOUT=1.8V,IO=4.0A~Short)

VOUT1V/div

VOUT1V/div

IL5A/divIL5A/div

Time(10ms/div)Time(10ms/div)

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SY8884A

OutputInductorL

OperationThereareseveralconsiderationsinchoosingthis

inductor.

TheSY8884Aisahighefficiency1MHz

synchronousstepdownDC/DCregulator,whichis1)Choosetheinductancetoprovidethedesired

capableofdeliveringupto4Aoutputcurrent.Itcanripplecurrent.Itissuggestedtochoosetheripple

operateoverawideinputvoltagerangefrom2.5Vtocurrenttobeabout40%ofthemaximumoutput

5.5Vandintegratemainswitchandsynchronouscurrent.Theinductanceiscalculatedas:

switchwithverylowRDS(ON)tominimizethe

VOUT(1VOUT/VIN,MAX)

conductionloss.L

fSWIOUT,MAX40%

Thelowoutputvoltageripple,thesmallexternalWherefSWistheswitchingfrequencyandIOUT,MAXis

inductorandthecapacitorsizesareachievedwiththemaximumloadcurrent.

1MHzswitchingfrequency.

TheSY8884Aisquitetolerantofdifferentripple

currentamplitude.Consequently,thefinalchoiceof

ApplicationsInformationinductancecanbeslightlyoffthecalculationvalue

BecauseofthehighintegrationintheSY8884A,thewithoutsignificantlyimpactingtheperformance.

applicationcircuitbasedonthisICisrathersimple.

OnlytheinputcapacitorCIN,theoutputcapacitor2)Thesaturationcurrentratingoftheinductormust

COUT,theoutputinductorLandthefeedbackresistorsbeselectedtobegreaterthanthepeakinductor

(RHandRL)needtobeselectedforthetargetedcurrentunderfullloadconditions.

applicationsspecifications.V(1-V/VOUTOUTINMAX,)

I,I,SATMINOUTMAX

2fLSW

FeedbackResistorDividersRHandRL

ChooseRHandRLtoprogramtheproperoutput3)TheDCRoftheinductorandthecorelossatthe

voltage.Tominimizethepowerconsumptionunderswitchingfrequencymustbelowenoughto

lightloads,itisdesirabletochooselargeresistanceachievethedesiredefficiencyrequirement.Itis

valuesforbothRHandRL.Avalueofbetween1kΩdesirabletochooseaninductorwith

and1MΩishighlyrecommendedforRL.IfDCR<60mΩtoachieveagoodoverallefficiency.

RL=100kΩischosen,thenRHcanbecalculatedtobe:

(V0.6V)ROUTLLoadTransientConsiderations

RH

0.6VTheSY8884Aintegratesthecompensation

componentstoachievegoodstabilityandfast

InputCapacitorCINtransientresponses.Insomeapplication,addinga

AtypicalX5Rorbettergradeceramiccapacitorwithceramiccapacitor(feed-forwardcapacitor,Cff)in

10Vratingandgreaterthan10µFcapacitanceisparallelwithRHmayfurtherspeeduptheload

recommended.Thisceramiccapacitorneedtobetransientresponsesandisthusrecommendedfor

placedreallyclosetotheINandGNDpinstoapplicationswithlargeloadtransientstep

minimizethepotentialnoiseproblem.Careshouldberequirements.Typically,for1.2V/1.8V/3.3Voutput,

takentominimizetheloopareaformedbyCIN,andtheRH,RL,Cffisrecommendedasbelow:

theIN/GNDpins.

RecommendedComponentSelection

OutputCapacitorCOUTVOUTRHRLCff

Theoutputcapacitorisselectedtohandletheoutput1.2V49.9kΩ49.9kΩ22pF

ripplenoiserequirements.Bothsteadystateripple1.8V100kΩ49.9kΩ10pF

andtransientrequirementsmustbetakeninto3.3V100kΩ22.1kΩ10pF

considerationwhenselectingthiscapacitor.Forthe

bestperformance,itisr