矽力杰 Silergy SY83088C 同步降压转换器 规格书 Datasheet 佰祥电子

SY83088C

HighEfficiencyFastResponse,8A,28VInput,Fixed5.1VOutput

SynchronousBuckConverterwith100mA5VLDO

GeneralDescriptionFeatures

TheSY83088CdevelopsahighefficiencysynchronousLowRDS(ON)forInternalMOSFETs:20mΩTop,10mΩ

Buckconvertercapableofdelivering8Acurrent.ItBottom

integratesthetopMOSFETandthebottomMOSFETwithWideInputVoltageRange:5.5V~24V

verylowRDS(ON)tominimizetheconductionloss.Inaddition,Fixed5.1VOutputVoltage

itoperatesatpseudo-constantfrequencyof600kHzunderLargeDutyCycleOn-TimeStretch

CCMconditiontominimizethesizeofinductorand8AContinuousOutputCurrentCapability

capacitor.TheSY83088Calsoprovidesafixed5VLDO100mALDOCurrentCapability

with100mAcurrentcapability,whichcanbeusedtopower600kHzPseudo-ConstantFrequency

theexternalperipheries.The5VLDOcanswitchtoBuck

±1.5%InternalReferenceVoltage

converteroutputtoreducepowerloss.

Internal0.8msSoft-StartLimitstheInrushCurrent

ConstantOn-TimeandRipple-BasedControlto

Silergy’sconstanton-timeandripple-basedcontrolstrategy

AchieveFastTransientResponses

supportshighinput/outputvoltageratios(lowdutycycles),

andfasttransientresponsewhilemaintaininganearIntegrated1.5ΩBypassSwitch

constantoperatingfrequencyoverline,loadandoutputPFM/USMSelectableLightLoadOperationMode

voltageranges.ThiscontrolmethodprovidesstablePowerGoodIndicator

operationwithoutcomplexcompensationandevenwithlowOutputAuto-DischargeFunction

ESRceramiccapacitors.Cycle-by-CycleValleyandPeakCurrentLimit

Protection

TheSY83088CoperatesoverawideinputvoltagerangeLatch-OffModeOutputUnderVoltageProtectionfor

from5.5Vto24V.Cycle-by-cyclecurrentlimit,inputunderBuck

voltagelockout,internalsoft-start,outputundervoltageLatch-OffModeOutputOverVoltageProtectionfor

protection,overvoltageprotectionandovertemperatureBuck

protectionprovidesafeoperationinalloperatingconditions.Latch-OffModeOverTemperatureProtectionfor

Buck

Auto-RecoveryModeOutputUnderVoltage

ProtectionforLDO

Auto-RecoveryModeOverTemperatureProtection

forLDO

InputUnderVoltageLockout(UVLO)

RoHSCompliantandHalogenFree

CompactPackage:QFN2.5×2.5-16

Applications

LCD-TV/Net-TV/3D-TV

SetTopBox

Notebook

HighPowerAP

TypicalApplications

BUCKEfficiencyvsOutputCurrent

(IOUT=0~8A,PFM,L=1.5µH/PCMB104T-1R5M)

VIN:5.5V~24V100

INPGPG(OpenDrainOutput)

90

CINCIN

GNDBS80

CBS70

LVOUT

LX(%)60

COUT50

ON/OFFEN1OUT

40

VIN=7.4V,VOUT=5.1V

CFFRFFEfficiency30

V=12V,V=5.1V

ON/OFFEN2FFINOUT

20VIN=19V,VOUT=5.1V

VIN=24V,VOUT=5.1V

10

VCCLDOVLDO

CVCCCLDO0

0.0010.010.118

OutputCurrent(A)

Figure1.SchematicDiagramFigure2.BuckEfficiencyvs.OutputCurrent

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SY83088C

OrderingInformationPinout(topview)

Ordering

PackagetypeTopMark

LX

LX

VCC

NumberGND

QFN2.5×2.5-1616151413

SY83088CRHCRoHSCompliantandHalogenGBExyz

Free

BS112LDO

x=yearcode,y=weekcode,z=lotnumbercode

IN211OUT

Exposed

Pad

IN3(GND)10FF

IN49EN1

5678

2

LX

PG

EN

GND

PinDescription

PinNoPinNamePinDescription

Bootstrappin.SupplytopFETgatedriver.Connecta0.1µFceramiccapacitorbetween

1BS

theBSpinandtheLXpin.

Inputpin.DecouplethispintotheGNDpinwithatleasta10µFceramiccapacitor.A

2,3,4IN

0.1μFinputceramiccapacitorisrecommendedtoreducetheinputnoise.

5,15,16LXInductorpin.Connectthispintotheswitchingnodeoftheinductor.

6,14,EPGNDGroundpin.

Powergoodindicatorpin.Opendrainoutputwhentheoutputvoltageiswithin90%to

7PG

120%oftheregulatedvalue.

EnablecontrolpinofthedeviceandinternalLDO.Pullthispinhightoturnonthedevice

8EN2andinternalLDO.PullthispinlowtoturnoffthedeviceandLDO.Donotleavethispin

floating.

EnablecontrolpinoftheBuckconverter.PullthispinhightoturnontheBuckconverter.

PullthispinlowtoturnofftheBuckconverter.Donotleavethispinfloating.

9EN1ThepinisalsousedforcontrollingoperationmodeoftheBuckconverterunderlight

loadconditionafteritsoutputiswithintheregulatedrange.Whenitsvoltageislower

than1.6Vandhigherthan1V,theBuckconverterworksunderultra-sonicmode.When

itsvoltageishigherthan2.2V,theBuckconverterworksunderPFMmode.

Outputfeedforwardpin.ConnecttheRCnetworktothispinfromthenodeofoutput

10FF

capacitorsclosesttotheinductor.

Outputpin.Connectthispinwithoutputcapacitorswhereyouwanttoregulatethe

11OUT

voltage.Thepinalsoprovidesthebypassinputfor5VLDO.

12LDO5VLDOoutputpin.Decouplethispintogroundwithatleasta4.7µFceramiccapacitor.

Internal3.6VLDOoutputpin.Powersupplyforinternalanalogcircuitsanddriving.

13VCC

Decouplethispintogroundwithatleasta2.2µFceramiccapacitor.

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SY83088C

BlockDiagram

IN

Input

UVLO

CurrentSense

PGVCC

Bootstrap

Charge

EN1

BS

EN2PWM

Control&

InternalProtection

Soft-startLogicLX

OTPCurrentSense

VCC

OVP

UVP

VFB

GND

FF

RH

OUTIN3.6VLDOVCC

4.7V

5VLDOLDO

RL

Figure3.BlockDiagram

AbsoluteMaximumRatings

Parameter(Note1)MinMaxUnit

IN-0.328

IN-LX,LX,PG,EN2,EN1-0.326

BS-LX,VCC,FF

-0.34V

OUT,LDO-0.36.5

LX,10nsDuration-529

LX,20nsDuration-128

JunctionTemperature,Operating-40150

LeadTemperature(Soldering,10)260°C

StorageTemperature-65150

ThermalInformation

Parameter(Note2)TypUnit

θJAJunction-to-AmbientThermalResistanceMax33

°C/W

θJCJunction-to-CaseThermalResistance5.5

PDPowerDissipationTA=25°C3W

RecommendedOperatingConditions

Parameter(Note3)MinMaxUnit

IN5.524V

BuckOutputCurrent8A

LDOOutputCurrent100mA

AmbientTemperature-4085

°C

JunctionTemperature-40125

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SY83088C

ElectricalCharacteristics

（VIN=12V,COUT=66μF,CFF=470pF,RFF=1kΩ,TJ=25°C,IOUT=1Aunlessotherwisespecified）

ParameterSymbolTestConditionsMinTypMaxUnit

VoltageRangeVIN5.524

UVLOThresholdVIN,UVLOVINrising5V

UVLOHysteresisVIN,HYS0.5

InputIOUT=0A,EN2=EN1=High,

QuiescentCurrentIQ96120

VOUT=VSET×105%

µA

ShutdownCurrent1ISHDN1EN1=Low,EN2=High6085

ShutdownCurrent2ISHDN2EN1=Low,EN2=Low69

VoltageSet-PointVSETCCM5.0235.15.177V

DischargeCurrentIDISVOUT=5.1V100mA

Soft-StartTimetSSVOUTfrom0%to100%VSET0.8ms

OutputOVPThresholdVOVPVFBrising117120123

%VREF

OVPHysteresisVOVP,HYS5

OVPDelaytOVP,DLY(Note4)3040µs

UVPThresholdVUVP556065%VREF

UVPDelaytUVP,DLY(Note4)200µs

TopFETRDS(ON)RDS(ON),TOP20

mΩ

BottomFETRDS(ON)RDS(ON),BOT10

TopFETCurrentLimit

ILMT,TOP20

Threshold

MOSFET

BottomFETCurrentLimit

ILMT,BOT10

ThresholdA

BottomFETReverse

ILMT,RVSUSMmode34.8

CurrentLimitThreshold

InputVoltageHighVEN,H1

InputVoltageLowVEN,L0.4

EN1VoltageforUltra-Sonic

VEN1,USM11.6V

Mode

Enable(EN)

EN1VoltageforPFMModeVEN1,PFM2.2VIN

De-GlitchTimetEN,DG(Note4)40µs

SwitchingFrequencyfSWCCM510600690

Ultra-SonicModekHz

fUSMUSMmode,IOUT=0A20

FrequencyFrequency

MinimumOn-TimetON,MIN50

ns

MinimumOff-TimetOFF,MIN150

RisingThresholdVPG,RVFBrising(good)879093

%VREF

FallingThresholdVPG,FVFBfalling(notgood)808386

PowerGoodtPG,RLowtohigh(Note4)200

DelayTimeµs

tPG,FEN1=High,Hightolow(Note4)40

LowVoltageVPG,LOWVFB=0V,IPG=5mA0.45

V

VCCOutputVoltageVCCVCCadds1mAload3.453.63.75

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SY83088C

ParameterSymbolTestConditionsMinTypMaxUnit

Bypassswitchturnsoff,ILDO=

OutputVoltageVLDO4.8555.15V

0mA

LDODropoutVoltageVDROPOUTILDO=100mA300mV

OutputCurrentLimit

ILMT,LDO150310mA

Threshold

RDS(ON)RDS(ON),BYP1.5Ω

TurnonVoltageVBYP4.54.74.95

BYPV

TurnonHysteresisVBYP,HYS0.2

OVPVoltageVBYP,OVPVOUTsweeps114120126%VLDO

BuckTemperatureTOTP,BUCKTJrising(Note4)150

BuckTemperature

TBUCK,HYSTJfalling(Note4)15

Hysteresis

OTP°C

LDOTemperatureTOTP,LDO(Note4)160

LDOTemperature

TLDO,HYS(Note4)25

Hysteresis

Note1:Stressesbeyondthe“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thesearestress

ratingsonly.Functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperational

sectionsofthespecificationisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffect

devicereliability

Note2:PackagethermalresistanceismeasuredinthenaturalconvectionatTA=25°Cona8.5cm×8.5cmsize,four-layer

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