矽力杰 Silergy SY83086 同步降压转换器 规格书 Datasheet 佰祥电子

SY83086

HighEfficiency,FastResponse,6A,28VInput

SynchronousBuckConverter

GeneralDescriptionFeatures

TheSY83086isahighefficiencysynchronousbuckLowRDS(ON)forInternalMOSFETs:28mΩTop,

converteroperatingoverawideinputvoltagerangeof4.5V16mΩBottom

to24Vandcapableofdeliveringupto6Acurrent.ItWideInputVoltageRange:4.5V~24V

integrateslowRDS(ON)topandbottomMOSFETstoAdjustableOutputVoltage:0.6V~2.5V

minimizetheconductionloss.Itoperatesatapseudo-6AContinuousOutputCurrentCapability

constantfrequencyof500kHz,toenabletheuseofsmall500kHzPseudo-ConstantFrequency

sizeinductorandcapacitors.TheSY83086alsointegrates±1%InternalReferenceVoltage

abypassswitchwhichallowstheVCCtobepoweredbyInternal0.6msSoft-StartLimitstheInrushCurrent

external3.3Vpowersupplyandfurtherreducesthepower

ConstantOn-TimeandRipple-BasedControl

consumptionoftheentiresystem.

ExcellentDynamicPerformance

Integrated1.2ΩBypassSwitch

Silergy’sconstanton-timeandripple-basedcontrolstrategyPFM/USMSelectableLightLoadOperationMode

supportshighinput/outputvoltageratios(lowdutycycles),PowerGoodIndicator

andfasttransientresponsewhilemaintaininganearOutputAuto-DischargeFunction

constantoperatingfrequencyoverline,loadandoutputAdjustableValleyCurrentLimitThresholdbyILMT

voltageranges.ThiscontrolmethodprovidesstablePin

operationwithoutcomplexcompensation,includingwhenCycle-by-CyclePeakandValleyCurrentLimit

usinglowESRoutputceramiccapacitors.Protection

Latch-OffModeOutputUnderVoltageProtection

TheSY83086providescycle-by-cyclecurrentlimit,inputLatch-OffModeOutputOverVoltageProtection

undervoltagelockout,internalsoft-start,outputunderLatch-OffModeOverTemperatureProtection

voltageprotection,overvoltageprotectionandoverInputUnderVoltageLockout(UVLO)

temperatureprotection,toguaranteesafeoperationinallRoHSCompliantandHalogenFree

operatingconditions.Compactpackage:QFN2.5×2.5-16

Applications

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

SetTopBox

Notebook

HighPowerAP

TypicalApplication

Efficiencyvs.OutputCurrent

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

VIN:4.5V~24V100

INPGPG(OpenDrainOutput)

CINCIN

90

GNDBS

CBS

LVOUT80

TESTTESTLX(%)

(FloatingorconnectedtoGND)

RFF

RHCOUT

On/OffControl70

ENCFF

FB

EfficiencyEfficiency60VIN=5V,VOUT=1.05V

Low/Floating/HighRL

ILMTVIN=12V,VOUT=1.05V

VIN=19V,VOUT=1.05V

50

VBYP(optional)BYPVCCVIN=24V,VOUT=1.05V

CBYPCVCC

40

0.0010.010.116

OutputCurrent(A)

Figure1.SchematicDiagramFigure2.BuckEfficiencyvs.OutputCurrent

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SY83086

OrderingInformationPinout(topview)

D

OrderingC

N

C

X

PackagetypeTopMarkX

L

L

V

NumberG

QFN2.5×2.5-1616151413

SY83086RHCRoHSCompliantandHalogenGBMxyz

Free

BS112BYP

x=yearcode,y=weekcode,z=lotnumbercode

IN211FB

Exposed

Pad

IN3(GND)10ILMT

IN49EN

5678

T

X

D

G

L

S

N

P

E

G

T

PinDescription

PinNoPinNamePinDescription

Bootstrappin.SupplytopMOSFETgatedriver.Connecta0.1µFceramiccapacitor

1BS

betweentheBSpinandtheLXpin.

Inputpin.DecouplethispintotheGNDpinwithatleasta10µFceramiccapacitor.A

2,3,4IN0.1μFceramiccapacitorplacedinparallelisrecommendedtoreducehighfrequency

noise.

5,15,16LXInductorpin.Connectthispintotheswitchingnodeoftheinductor.

6,14,EPGNDGroundpin.

Powergoodindicatorpin.PGpinshouldbeconnectedtoVINoranothervoltagesource

7PGthrougharesistor(e.g.,10kΩ~100kΩ).Thispinbecomeshighwhentheoutputvoltage

iswithin90%to120%ofregulatedvalueundernormaloperation.

8TESTForfactoryuseonly.LeavethispinfloatingorconnectittoGNDinapplication.

Enablecontrolpinofthebuckconverter.Pullhightoturnon.Pulllowtoturnoff.Donot

leavethispinfloating.

Thepinisalsousedforcontrollingtheoperationmodeofthebuckconverterunderlight

9ENloadconditionafteritsoutputiswithintheregulatedrange.Whenitsvoltageislower

than1.6Vandhigherthan1V,thebuckconverteroperatesinultra-sonicmode.When

itsvoltageishigherthan2.2V,thebuckconverteroperatesinpulse-frequency

modulationmode.

10ILMTValleycurrentlimitthresholdselectionpin.Seetable1.

Outputfeedbackpin.Connectthispintothecenterpointoftheoutputresistordivider

11FB

asshowninFigure1.VOUT=0.6×(1+RH/RL).

External3.3Vbypasspowersupplyinputpin.Decouplethispintogroundwitha1µF

ceramiccapacitor.MakeonegoodRCfilterforBYPinputifthe3.3Vexternalpower

12BYP

railhassignificantripple.Leavethispinfloatingorconnectthispintothegroundifitis

notused.

Internal3.3VLDOoutputpin.Powersupplyfortheinternalanalogcircuits.Decouple

13VCC

thispintogroundwithatleasta2.2µFceramiccapacitor.

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SY83086

BlockDiagram

IN

Input

UVLO

CurrentSense

PGVCC

TESTBootstrap

Charge

ILMTBS

ENPWM

Control&

InternalProtection

Soft-startLogicLX

OTPCurrentSense

VCC

OVP

UVP

VREF

VFBGND

FB

IN

3.1V

3.3VLDOVCC

BYP

Figure3.BlockDiagram

AbsoluteMaximumRatings

Parameter(Note1)MinMaxUnit

IN-0.328

IN-LX,LX,PG,EN,TEST-0.326

BS-LX,VCC,ILMT,FB-0.34

V

BYP-0.36

LX,10nsDuration-529

LX,20nsDuration-128

JunctionTemperature,Operating-40150

LeadTemperature(Soldering,10s)260°C

StorageTemperature-65150

ThermalInformation

Parameter(Note2)TypUnit

θJAJunction-to-AmbientThermalResistanceMax33

°C/W

θJCJunction-to-CaseThermalResistance5.5

PDPowerDissipationTA=25°C3W

RecommendedOperatingConditions

Parameter(Note3)MinMaxUnit

InputVoltage4.524

V

OutputVoltage0.62.5

ContinuousOutputCurrent6A

AmbientTemperature-4085

°C

JunctionTemperature-40125

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SY83086

ElectricalCharacteristics

（VIN=12V,COUT=66μF,CFF=220pF,RFF=1kΩ,TJ=25°C,IOUT=1Aunlessotherwisespecified）

ParameterSymbolTestConditionsMinTypMaxUnit

VoltageRangeVIN4.524

UVLORisingThresholdVIN,UVLOVINrising4.4V

UVLOHysteresisVIN,HYS0.5

EN=High,VBYP=0V,VOUT=

InputQuiescentCurrent1IQ1190240

VSET×105%

EN=High,VBYP=3.3V,VOUT=µA

QuiescentCurrent2IQ25075

VSET×105%

ShutdownCurrentISHDNEN=Low59

VoltageRangeVOUT0.62.5

V

FeedbackReferenceVoltageVREF0.5940.6000.606

FBInputCurrentIFBVFB=1V-5050nA

DischargeCurrentIDISVOUT=1.2V40mA

VOUTfrom0%to100%VSET

Soft-StartTimetSS0.6ms

Output(Note4)

OVPThresholdVOVPVFBrising117120123

%VREF

OVPHysteresisVOVP,HYS5

OVPDelayTimetOVP,DLY(Note4)30µs

UVPThresholdVUVPVFBfalling556065%VREF

UVPDelayTimetUVP,DLY(Note4)200µs

TopMOSFETRDS(ON)RDS(ON),TOP28

mΩ

BottomMOSFETRDS(ON)RDS(ON),BOT16

TopMOSFETCurrentLimit

ILMT,TOP17.5

Threshold

MOSFETsILMT=Low69

BottomMOSFETCurrentLimit

ILMT,BOTILMT=Floating812

ThresholdA

ILMT=High3.55.5

BottomMOSFETReverse

ILMT,RVSUSMmode2.43

CurrentLimitThreshold

InputVoltageHighVEN,H1

InputVoltageLowVEN,L0.4

EnableENVoltageforUltra-sonicV

VEN,USM11.6

(EN)Mode

ENVoltageforPFMModeVEN,PFM2.2VIN

De-GlitchTimetEN,DG(Note4)40µs

VCC–

InputVoltageHighVILMT,H(Note4)

ILMT0.8V

InputVoltageLowVILMT,L(Note4)0.4

SwitchingFrequencyfSWVOUT=1.2V,CCM410500590

FrequencykHz

Ultra-sonicModeFrequencyfUSMUSMmode,IOUT=0A20

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SY83086

ParameterSymbolTestConditionsMinTypMaxUnit

MinimumOn-TimetON,MIN50

ns

MinimumOff-TimetOFF,MIN200

RisingThresholdVPG,RVFBrising(good)869094

%VREF

FallingThresholdVPG,FVFBfalling(notgood)818589

PowertPG,RLowtohigh(Note4)200

Good

(PG)DelayTimetPG,FHightolow(Note4)30µs

tPG,OFFICshutsdown(Note4)0.5

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

V

VCCOutputVoltageVCCVCCadds1mAload3.37

RDS(ON)RDS(ON),BYP1.2Ω

TurnonVoltageVBYP2.973.1

BYPV

TurnonHysteresisVBYP,HYS0.2

OVPVoltageVBYP,OVP120%VCC

TemperatureTOTPTJrising(Note4)150

OTP