矽力杰 Silergy SY89456 同步降压转换器 规格书 Datasheet 佰祥电子

SY89456

HighEfficiencyFastResponse,99%Duty,6A,40VInput

SynchronousBuckConverter

GeneralDescriptionFeatures

TheSY89456developsahighefficiencysynchronousLowRDS(ON)forInternalMOSFET:38mΩTop,19mΩ

Buckconvertercapableofdelivering6Acontinuous.TheBottom

deviceintegratestopFETandbottomFETwithverylowWideInputVoltageRange:4V~40V

RDS(ON)tominimizetheconductionloss.Inaddition,itWideOutputVoltageRange:0.6V~24V

operatesatpseudo-constantfrequencyof500kHzunderSupport99%DutyCycleOperation

CCMconditiontominimizethesizeofinductorand±1.5%0.6VReferenceunder-40℃~125℃

capacitor.TheSY89456alsointegratesabypassswitch6AContinuousOutputCurrentCapability

whichallowstheVCCtobepoweredbyexternal3.3V

Pseudo-ConstantFrequency:500kHz

powersupply,furtherreducethepowerconsumptionof

ConstantOn-timeandRipple-BasedControlto

theentiresystem.

AchieveFastTransientResponses

Silergy’sconstanton-timeandripple-basedcontrolInternalSoft-startLimitstheInrushCurrent

strategysupportshighinput/outputvoltageratios(lowPFM/FCCMSelectableLightLoadOperation

dutycycles),andfasttransientresponsewhileSelectablePeakandValleyCurrentLimitThreshold

maintaininganearconstantoperatingfrequencyoverline,OptionalBYPInputforReducingPowerConsumption

loadandoutputvoltageranges.ThiscontrolmethodPowerGoodIndicator

providesstableoperationwithoutcomplexcompensationOutputAuto-DischargeFunction

andevenwithlowESRceramiccapacitors.Cycle-by-CycleValley,PeakandReverseCurrent

LimitProtection

TheSY89456operatesoverawideinputvoltagerangeHic-cupModeOutputUnderVoltageProtection

from4Vto40V.Cycle-by-cyclecurrentlimit,inputunderAuto-RecoveryModeOutputOverVoltageProtection

voltagelockout,internalsoft-start,outputundervoltageAuto-RecoveryModeOverTemperatureProtection

protection,overvoltageprotectionandovertemperatureInputUnderVoltageLockout(UVLO)

protectionprovidesafeoperationinalloperating

RoHSCompliantandHalogenFree

conditions.

CompactPackage:QFN2×3-14

Applications

LCD-TV/Net-TV/3DTV

SetTopBox

Monitor

HighPowerAP

TypicalApplication

Efficiencyvs.OutputCurrent

CBS

(VBYP=3.3V,IOUT=0~6A,PFM,L=2.2µH/PCMB104T-2R2MS)

100

L

VIN:4V~40VBSVOUT

INLX95

RFF

RH

CINCOUT

90

PGCFF

FB(%)

RPG

R

L85

ON/

ENMODE

OFF

V=7.4V,V=5.0V

RMODEEfficiency80INOUT

VBYP(optional)VIN=12V,VOUT=5.0V

BYPVCCVIN=24V,VOUT=5.0V

75VIN=36V,VOUT=5.0V

GNDAGNDCVCC

CBYP

70

0.0010.010.116

OutputCurrent(A)

Figure1.SchematicDiagramFigure2.Efficiencyvs.OutputCurrent

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SY89456

OrderingInformationPinout(topview)

Ordering

PackagetypeTopMark

PartNumber

GNDGNDGND

SY89456WYQQFN2×3-14KDNxyz

RoHSCompliantandHalogenFree141312

x=yearcode,y=weekcode,z=lotnumbercode

11GND

ValleyCurrentPeakCurrentLimitLX1

MODEConnectionMODE

LimitThresholdThreshold

BS210IN

VCCPFM4A6A

240kΩ±15%toGNDPFM6A9APG39EN

120kΩ±15%toGNDPFM9A14ABYP48MODE

GNDFCCM4A6A567

30kΩ±15%toGNDFCCM6A9AVCCAGNDFB

60kΩ±15%toGNDFCCM9A14A

Table1.MODESelection

PinDescription

PinNoPinNamePinDescription

1LXInductorpin.Connectthispintotheswitchingnodeoftheinductor.

Bootstrappin.Supplyhighsidegatedriver.Connecta0.1μFceramiccapacitor

2BS

betweentheBSpinandtheLXpin.

Powergoodindicator.Opendrainoutputwhentheoutputvoltageiswithin90%to120%

3PG

ofregulatedvalue.

External3.3Vbypasspowersupplyinput.DecouplethispintotheGNDwitha1μF

4BYP

ceramiccapacitor.LeavethispinfloatingorconnectthispintotheGNDifnotused.

Internal3.3VLDOoutput.Powersupplyforinternalanalogcircuitsanddrivingcircuit.

5VCC

DecouplethispintoGNDwitha2.2μFceramiccapacitor.

6AGNDAnaloggroundpin.

7FBOutputfeedbackpin.Connecttothecenterpointofresistordivider.

Operationmodeselection.ProgramMODEtoselectFCCM/PFM,andthevalleyand

8MODE

peakcurrentlimitthresholds.RefertoTable1formoredetails.

EnablecontroloftheBuckregulator.PullhightoturnontheBuckregulatorandpull

9EN

lowtoturnofftheBuckregulator.Donotleavethispinfloating.

Inputpin.DecouplethispintoGNDpinwithatleasta10µFceramiccapacitor.A0.1μF

10IN

ceramiccapacitorplacedinparallelisrecommendedtoreducehighfrequencynoise.

11,12,13,14GNDGroundpin.

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SY89456

BlockDiagram

IN

Input

UVLO

CurrentSense

PGVCC

MODEBootstrap

Charge

ENBS

Internal

SSTPWMLX

OTPControl&

ProtectionCurrentSense

LogicVCC

OVP

UVP

0.6V

FBGND

IN

BYP3.1V

3.3VLDOVCC

Figure3.BlockDiagram

AbsoluteMaximumRatings

Parameter(Note1)MinMaxUnit

IN-0.340

LX,PG,EN,MODE-0.3IN+0.3

BS-LX,VCC,AGND,BYP-0.34

V

FB-0.34

DynamicLXVoltagein10nsDurationGND-5IN+3

DynamicLXVoltagein20nsDurationGND-1IN+2

JunctionTemperature,Operating-40150

LeadTemperature(Soldering,10sec.)260°C

StorageTemperature-65150

ThermalInformation

Parameter(Note2)TypUnit

θJAJunction-to-AmbientThermalResistance22

°C/W

θJCJunction-to-CaseThermalResistance3

PDPowerDissipationTA=25°C4.5W

RecommendedOperatingConditions

Parameter(Note3)MinMaxUnit

IN440

V

OutputVoltage0.624

ContinuousOutputCurrent6A

JunctionTemperature-40125°C

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SY89456

ElectricalCharacteristics

(VIN=12V,VOUT=5V,L=2.2μH,COUT=66μF,TA=25°C,IOUT=1A,unlessotherwisespecified(Note4))

ParameterSymbolTestConditionsMinTypMaxUnit

VoltageRangeVIN440

UVLOThresholdVIN,UVLOVINrising3.43.95V

UVLOHysteresisVIN,HYS0.3

Input

IOUT=0A,EN=High,VFB=

QuiescentCurrentIQ60

VREF×105%µA

ShutdownCurrentISHDNEN=Low610

VoltageRangeVOUT0.624

V

FeedbackReferenceVoltageVREFTJ=-40℃~125℃0.5910.60.609

DischargeCurrentIDISVOUT=5V80mA

Soft-startTimetSSVOUTfrom0%to100%VSET0.711.3ms

MaximumDutyCycleDMAXWithoutinductor99%

FBInputCurrentIFBVFB=1V-5050nA

OutputOVPThresholdVOVPVFBrising115120125

%VREF

OVPHysteresisVOVP,HYS5

OVPDelaytOVP,DLY(Note5)40μs

UVPThresholdVUVP455055%VREF

UVPDelaytUVP,DLY(Note5)50μs

UVPHic-cupOnTimetHICCUP,ON(Note5)2

ms

UVPHic-cupOffTimetHICCUP,OFF(Note5)6

TopFETRDS(ON)RDS(ON)138

mΩ

BottomFETRDS(ON)RDS(ON)219

ILMT,TOP1VMODE=0VorVCC6

TopFETCurrentLimit

ILMT,TOP2RMODE=30kΩor240kΩ9

Threshold

ILMT,TOP3RMODE=60kΩor120kΩ14

MOSFET

ILMT,BOT1VMODE=0VorVCC4

BottomFETCurrentLimitA

ILMT,BOT2RMODE=30kΩor240kΩ6

Threshold

ILMT,BOT3RMODE=60kΩor120kΩ9

BottomFETReverseCurrent

ILMT,RVSFCCMMode2.545

LimitThreshold

RisingThresholdVEN,R1.081.21.32

Enable(EN)V

FallingThresholdVEN,F0.91.01.1

SwitchingFrequencyfSWVOUT=5V,CCM425500575kHz

FrequencyMinOn-TimetON,MIN50

ns

MinOff-TimetOFF,MIN150

RisingThresholdVPG,RVFBrising(good)869094

%VREF

HysteresisVPG,HYS5

PowerGoodtPG,RLowtohigh(Note5)200

DelayTimeµs

tPG,FHightolow(Note5)40

LowVoltageVPG,LOWVFB=0V,IPG=5mA0.4

V

VCCOutputVoltageVCCVCCadds1mAload3.23.33.4

RDS(ON)RDS(ON),BYP5Ω

TurnonVoltageVBYP3.053.153.25

BYPV

TurnonHysteresisVBYP,HYS0.2

OVPVoltageVBYP,OVP120%VCC

TemperatureTOTP(Note5)150

OTP°C

TemperatureHysteresisTOTP,HYS(Note5)15

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SY89456

Note1:Stressesbeyond“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Theseareforstress

ratings.Functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperational

sectionsofthespecificationsisnotimplied.Exposuretoabsolutemaximumratingconditionsmayaffectdevicereliability.

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

SilergyEvaluationBoardwith2-ozcopper.

Note3:Thedeviceisnotguaranteedtofunctionoutsideitsoperatingconditions.

Note4:Unlessotherwisestated,limitsare100%productiontestedunderpulsedloadconditionssuchthatTATJ=25°C.

Limitsovertheoperatingtemperaturerange(Refertorecommendedoperatingconditions)andrelevantvoltagerange(s)

areguaranteedbydesign,test,orstatisticalcorrelation.

Note5:Guaranteedbydesign.

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SY89456

TypicalPerformanceCharacteristics

(TA=25°C,VIN=12V,VOUT=5V,L=2.2μH,COUT=66μF,CFF=470pF,RFF=1kΩ,unlessotherwisenoted)

Efficiencyvs.OutputCurrentEfficiencyvs.OutputCurrent

(VBYP=3.3V,IOUT=0~6A,PFM,L=1µH/PCMB104T-1R0MT)(VBYP=3.3V,IOUT=0~6A,FCCM,L=1µH/PCMB104T-1R0MT)

100100

9590

9080

8570

(%)

(%)8060

7550

7040

EfficiencyEfficiency

EfficiencyEfficiency

6530

V=5V,V=1.2VVIN=5V,VOUT=1.2V

60INOUT20

VIN=12V,VOUT=1.2VVIN=12V,VOUT=1.2V

55VIN=24V,VOUT=1.2V10VIN=24V,VOUT=1.2V

VIN=36V,VOUT=1.2V