矽力杰 Silergy SY8868 2.7-5.5V 输入 6A 输出高效同步降压稳压器 规格书 (Datasheet)佰祥电子

SY8868

HighEfficiency1MHz,6A

SynchronousStepDownRegulator

GeneralDescriptionFeatures

SY8868isahighefficiency1MHzsynchronousstep-down

DC-DCregulatorICcapableofdeliveringupto6AoutputLowRDS(ON)forinternalswitches(top/bottom):

current.35/15mΩ

2.7-5.5Vinputvoltagerange

SY8868operatesoverawideinputvoltagerangefromPseudo-constantfrequency:1MHz

2.7Vto5.5VandintegratesmainswitchandsynchronousExternaladjustablesoft-startlimitstheinrush

switchwithverylowRDS(ON)tominimizetheconductioncurrent

loss.Powergoodindicator

OrderingInformationOutputautodischargeatshutdown

LatchoffprotectionundershortcircuitandOVP

SY8868□(□□)□conditions

TemperatureCodeRoHSCompliantandHalogenFree

PackageCodeCompactpackage:QFN2x2-10

Builtinover-temperatureprotection.

OptionalSpecCode

OrderingNumberPackageTypeNote

SY8868QMCQFN2x2-10------Applications

NotebookPC

Server

TypicalApplications

ON/OFF

L0.68uHVOUT:1.8V

VIN:2.7~5.5VEN

VINLX

CINCOUT

R

22uFPGOUT22uFx2

100K

RHCff

PG100k22pF

FB

SSRL

CSSGND49.9k

10nF

Figure.1schematicdiagram

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SY8868

Pinout(topview)

10987

OUTPGSSFB

1VINLX6

2LXLX5

3GNDEN4

TopMark:SY8868QMC:KTxyz(Devicecode:KT;x=yearcode,y=weekcode,z=lotnumbercode)

PinNamePinNumberPinDescription

VIN1PowerInputPin.DecouplethispintoGNDpinwitha22uFceramiccap.

LX2,5,6Inductorpin.Connectthispintotheswitchingnodeofinductor.

GND3Groundpin.

EN4Enablecontrolpin.Pullhightoturnon.Donotfloatthispin.

FB7Feedbackpin.Connectthispintothecenterpointoftheoutputresistordivider(as

showninFigure1)toprogramtheoutputvoltage:VOUT=0.6V*(1+RH/RL)

PG9Powergoodindicator(Opendrainoutput).Lowiftheoutput<90%ofregulation

voltage;Highotherwise.Connectapull-upresistortotheinput.

SS8Soft-startprogrammingpin.Connectacapacitorfromthispintogroundto

5

programthesoft-start.TSS=CSS*10s.IfSSisfloating,minimumsoft-starttimeis

200us.

OUT10Outputvoltagesensingpin.

AbsoluteMaximumRatings(Note1)

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

LXVoltage---------------------------------------------------------------------------------------------------0.3V（*1）to6V（*2）

Allotherpins----------------------------------------------------------------------------------------------0.3VtoVIN+0.6V

PowerDissipation,PD@TA=25°CQFN2x2-10-------------------------------------------------------------------------2.5W

PackageThermalResistance(Note2)

θJA---------------------------------------------------------------------------------------------------------------50°C/W

θJC---------------------------------------------------------------------------------------------------------------10°C/W

JunctionTemperatureRange---------------------------------------------------------------------------------------------150°C

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

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

(*1)LXVoltagetesteddownto-5V<10ns

(*2)LXVoltagetestedupto+7V<50ns

RecommendedOperatingConditions(Note3)

SupplyInputVoltage----------------------------------------------------------------------------------------------2.7Vto5.5V

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

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

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SY8868

ElectricalCharacteristics

(VIN=5V,VOUT=2.5V,L=0.68uH,COUT=22uFх2,TA=25°C,IMAX=1Aunlessotherwisespecified)

ParameterSymbolTestConditionsMinTypMaxUnit

InputvoltagerangeVIN2.75.5V

ShutdowncurrentISHDNEN=00.11µA

QuiescentcurrentIQIOUT=0,VFB=VREF105%50µA

FeedbackReferenceVoltageVREF0.5940.60.606V

PGrisingthresholdto90%

regulationlevelratio

OVPlatchoffProtectionVOVP120%

Threshold

OVPlatchoffprotectiondelay40µS

time

PFETRONRDS(ON),P35mΩ

NFETRONRDS(ON),N15mΩ

ValleycurrentlimitILIM67.5A

ENrisingthresholdVENH1.5V

ENfallingthresholdVENL0.4V

InputUVLOthresholdVUVLO2.65V

UVLOhysteresisVHYS0.2V

ONtimeTONVIN=5V,VOUT=1.2V,IOUT=1A240ns

Minofftime130ns

MaxDutyDMAX80%

ThermalshutdownTSD150°C

temperature

Thermalshutdownhysteresis15°C

OutputdischargeresistorRDSCH70Ω

Note1:Stressesbeyondthe“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Theseare

stressratingsonly.Functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedinthe

operationalsectionsofthespecificationisnotimplied.Exposuretoabsolutemaximumratingconditionsfor

extendedperiodsmayaffectdevicereliability.

Note2:θJAismeasuredinthenaturalconvectionatTA=25°Conafour-layerSilergyEvaluationBoard.

Note3:Thedeviceisnotguaranteedtofunctionoutsideitsoperatingconditions.

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