矽力杰 Silergy SY8308 4-40V 输入 8A 输出高效同步降压稳压器 规格书 (Datasheet)佰祥电子

SY8308

HighEfficiency,8.0A40VInput

SynchronousStepDownRegulator

GeneralDescriptionFeatures

TheSY8308developsahighefficiencysynchronousLowRDS(ON)forInternalSwitches

step-downDC/DCregulatorcapableofdelivering8A(Top/Bottom):25mΩ/12mΩ

continuouscurrent.Thedeviceintegratesmainswitch4~40VInputVoltageRange

andsynchronousswitchwithverylowRDS(ON)to8.0AOutputCurrentCapability

minimizetheconductionloss.Selectable350kHz/500kHzSwitching

Frequency

TheSY8308operatesoverawideinputvoltagerangePFM/PWMSelectableLightLoadOperation

from4Vto40V.ThedeviceadoptstheinstantPWMMode

architecturetoachievefasttransientresponsesforhighInstantPWMArchitecturetoAchieveFast

stepdownapplicationsandhighefficiencyatlightTransientResponses.

loads.

ProgrammableSoft-startLimitstheInrush

Current

ProgrammableValleyCurrentLimit

OrderingInformationThreshold

Hic-cupModeOutputShortCircuitProtection

□□□□

SY8308()PowerGoodIndicator

TemperatureCode0.6V±1%ReferenceVoltage

PackageCodeCompactPackage:QFN3.5×3.5-20

OptionalSpecCode

OrderingNumberPackagetypeNoteApplications

SY8308RBCQFN3.5×3.5-20--LCD-TV

SetTopBox

Notebook

Storage

HighPowerAPRouter

Networking

TypicalApplications

VBS

ININC

BSLV

COUT

INLX

GND

RC

C1OUT

FB1

ON/OFFEN

R

PG2

High/Floating/LowMODE

VCC

High/Floating/LowFSCVCC

ILMTSS

CSS

RLMT

Figure1.SchematicDiagram

SY8308Rev.1.0SilergyCorp.Confidential-PreparedforCustomerUseOnly1

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SY8308

Pinout(topview)

D

D

C

N

N

C

X

X

V

G

L

G

L

2019181716

BS115ILMT

IN214FB

IN3GND13FS

IN412PG

IN511EN

678910

S

E

D

D

X

L

S

D

N

N

O

G

G

M

(QFN3.5×3.5-20)

TopMark:BDYxyz,(Devicecode:BDY,x=yearcode,y=weekcode,z=lotnumbercode)

PinNamePinNumberPinDescription

Boot-strappin.Supplyhighsidegatedriver.Connecta0.1μFceramiccapacitor

BS1

betweentheBSandtheLXpin.

IN2,3,4,5Inputpin.DecouplethispintotheGNDpinwithatleasta10μFceramiccapacitor.

LX6,19,20Inductorpin.Connectthispintotheswitchingnodeoftheinductor.

7,8,17,18,

GNDGroundpin.

Exposedpad

Operatingmodeselectionunderlightload.PullthispinlowforPFMoperating;pull

MODE9

thispinhighorfloatingforPWMoperation.

Soft-startprogrammingpin.Connectacapacitorfromthispintogroundtoprogramthe

SS10soft-starttime.tss(ms)=Css(nF)×0.6V/6μA.Leavethispinopenfordefault1mssoft-

start.

EN11Enablecontrol.Pullhightoturnon.Donotleaveitfloating.

PowergoodIndicator.Open-drainoutputwhentheoutputvoltageiswithin85%to

PG12

122%ofregulationpoint.

Switchingfrequencyselection.Pullthispinlowfor350kHz;pullthispinhighor

FS13

floatingfor500kHz.

Outputfeedbackpin.Connectthispintothecenterpointoftheoutputresistordivider

FB14

(asshowninFigure1)toprogramtheoutputvoltage:VOUT=0.6×(1+R1/R2).

Valleycurrentlimitprogramming.I(A)=3600/R(kΩ).Leavethispin

ILMT15LMT_VALLEYLMT

openfordefault6Avalleycurrentlimitthreshold.

VCC16Internal3.3Voutput.Decouplethispintogroundwithatleasta4.7μFcapacitor.

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SY8308

BlockDiagram

IN

Input

UVLO

PGCurrentSense

ENBS

ILMT

MODE

FSPWMLX

Control&

CurrentSense

SSInternalProtection

SSTLogic

OTP

GND

0.6V

FB

VCC

IN3.3VLDO

Figure2.BlockDiagram

AbsoluteMaximumRatings(Note1)

SupplyInputVoltage--------------------------------------------------------------------------------------------------0.3Vto40V

BS-LX,VCC,FBVoltage--------------------------------------------------------------------------------------------0.3Vto4V

LIMT,FS,PG,EN,MODE,SS,LXVoltage--------------------------------------------------------0.3VtoVIN+0.3V

PowerDissipation,PD@TA=25°C,QFN3.5×3.5-20-----------------------------------------------------------------3.6W

PackageThermalResistance(Note2)

ƟJA----------------------------------------------------------------------------------------------------------------28°C/W

ƟJC------------------------------------------------------------------------------------------------------------------4°C/W

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

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

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

DynamicLXvoltagein10nsduration---------------------------------------------------------------------IN+3VtoGND-5V

RecommendedOperatingConditions(Note3)

SupplyInputVoltage----------------------------------------------------------------------------------------------------4Vto40V

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

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SY8308

ElectricalCharacteristics

(VIN=12V,TA=25°C,IOUT=1A,unlessotherwisespecified)

ParameterSymbolTestConditionsMinTypMaxUnit

InputVoltageRangeVIN440V

InputUVLOThresholdVUVLO3.9V

InputUVLOHysteresisVHYS0.3V

QuiescentCurrentIQIOUT=0,VFB=VREF×105%60µA

ShutdownCurrentISHDNEN=04µA

FeedbackReferenceVoltageVREF0.5940.60.606V

FBInputCurrentIFBVFB=3.3V-5050nA

TopFETRONRDS(ON)125mΩ

BottomFETRONRDS(ON)212mΩ

BottomFETValleyCurrent

IR=300kΩ~600kΩ612A

LimitProgramRangeLMT,RNGLMT

BottomFETValleyCurrent

IR=300kΩ9.61214.4A

LimitSettingAccuracyLMTLMT

BottomFETReverseCurrent

IMODE=High3.5A

LimitLMT,RVS

ENInputVoltageHighVEN,H1.5V

ENInputVoltageLowVEN,L0.4V

ENLeakageCurrentIEN1µA

MODEInputVoltageHighVMODE,HVCC-0.8V

MODEInputVoltageHighVMODE,L0.4V

MODELeakageCurrentIMODE1µA

FSInputVoltageHighVFS,HVCC-0.8V

FSInputVoltageHighVFS,L0.4V

FSLeakageCurrentIFS1µA

Vfalling,PGfromhighto

FB818589%V

lowREF

Vrising,PGfromlowto

FB859095%V

highREF

PowerGoodThresholdV

PG,THVfalling,PGfromlowto

FB104110116%V

highREF

Vrising,PGfromhighto

FB116122128%V

lowREF

Lowtohigh200µs

PowerGoodDelayt

PG,DLYHightolow10µs

Sink5mAtoPGpin,

PowerGoodLowVoltageV0.4V

PG_LOWFB=0.6V

Soft-startChargingCurrentISS6µA

InternalSoft-startTimetSSSSfloating1ms

OutputOverVoltageThresholdVOVPVFBrising116122128%VREF

OutputOverVoltageHysteresisVOVP,HYS10%VREF

OutputOVPDelaytOVP,DLY15µs

OutputUnderVoltage

VVfalling455055%V

ProtectionThresholdOUT,UVPFBREF

OutputUVPDelaytUVP,DLY200µs

UVPHic-cupONTimetUVP,ONSSfloating3ms

UVPHic-cupOFFTimetUVP,OFFSSfloating21ms

SwitchingFrequencyfSWFS=Floating,CCM400500600kHz

VCCOutputVoltageVVCC3.153.33.45V

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SY8308

ParameterSymbolTestConditionsMinTypMaxUnit

MinONTimetON,MIN80ns

MinOFFTimetOFF,MIN160ns

ThermalShutdown

T150°C

TemperatureSD

ThermalShutdownHysteresisTHYS15°C

Note1:Stressesbeyondthe“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Theseare

stressratingsonly.Functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedinthe

operationalsectionsofthespecificationisnotimplied.Exposuretoabsolutemaximumratingconditionsfor

extendedperiodsmayaffectdevicereliability.

Note2:PackagethermalresistanceismeasuredinthenaturalconvectionatTA=25°Conafour-layerSilergyEvaluation

Board.

Note3:Thedeviceisnotguaranteedtofunctionoutsideitsoperatingconditions.

SY8308Rev.1.0SilergyCorp.Confidential-PreparedforCustomerUseOnly5

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SY8308

TypicalPerformanceCharacteristics

(fsw=500kHz,TA=25°C)

Efficiencyvs.OutputCurrentEfficiencyvs.OutputCurrent

(VOUT=5V,MODE=Low,L=2.2µH/PCMB104T-2R2MS)(VOUT=5V,MODE=High,L=2.2µH/PCMB104T-2R2MS)

100100

9590

80

90

)

)70

%

%

(85(

y

y60

c

c

n

n80

e

e50

i

i

c

c

i

i

f

f

f

f7540

E

E

30

70VIN=7VVIN=7V

VIN=12V20VIN=12V

65VIN=24VVIN=24V

10

VIN=40VVIN=40V

600

0.0010.010.1180.0010.010.118

OutputCurrent(A)OutputCurrent(A)

Efficiencyvs.OutputCurrentEfficiencyvs.OutputCurrent

(VOUT=3.3V,MODE=Low,L=1.5µH/PCMB104T-1R5MS)(VOUT=3.3V,MODE=High,L=1.5µH/PCMB104T-1R5MS)

100100

9590

9080

)

)8570

%

%

(

(