矽力杰 Silergy SA24404 同步降压转换器 规格书 Datasheet 佰祥电子

SA24404

HighEfficiency,36VInput,4A

SynchronousStep-DownRegulator

GeneralDescriptionFeatures

4Vto36VInputVoltageRange

TheSA24404isahighefficiencysynchronousstep-down

DC-DCregulatorwithinternalpowerandsynchronous4AOutputCurrentCapability

rectifierswitches.ItoperatesusingfixedfrequencyandLowRDS(ON)forInternalSwitches:41mΩTop,

peakcurrentcontroloverawideinputvoltagerangeof4V21mΩBottom

to36V,andcandeliverupto4AofcontinuousoutputTypical30µAQuiescentCurrentand1µA

current.ShutdownCurrent.

300kHzto2.2MHzSwitchingFrequency

TheSA24404isspeciallydesignedwithasymmetricQFNSynchronizationtoExternalClock

packageandadjustableLXrisetimetoachievegoodEMISpreadSpectrumFunction

performance.TheswitchingfrequencycanbeadjustedHiccupModeOutputShort-CircuitProtection

from300kHzto2.2MHz,orsynchronizedtoanexternal

ENOn/OffControlwithAccurateThreshold

clock.Thefrequencycanbeselectedtomeetapplication

Cycle-by-CyclePeakCurrentLimit

EMIlimitsandtoavoidnoiseinimportantfrequencybands.

PowerGoodIndicator

TheSA24404offersexcellentefficiencyoverawiderange1V±1%ReferenceVoltageOver-40˚Cto150˚C

ofapplicationsbyprovidinginternal41mΩpowerandTemperatureRange

21mΩsynchronousrectifierswitches,frequencyreductionPackage:QFN3.5×4-14withWettableFlanks

atlightloadconditions,andanexternalbiasinput.The1μAAutomotiveAEC-Q100Grade1Certified

shutdownsupplycurrentallowsthedevicetobeusedin

batterypoweredapplications.TheSA24404ensuressafe

operationinalloperatingconditions,providingcycle-by-Applications

cyclecurrentlimit,inputundervoltagelockout,internalsoft-

start,outputundervoltageandovervoltageprotection,andAutomotive

thermalshutdown.Industrial

HighVoltageDC/DCConverters

TheSA24404isavailableinaQFN3.5×4-14package.

TypicalApplication

EfficiencyvsOutputCurrent

VIN

(FSW=400kHz,L=6.8μH/PCMB104T-6R8MS)

100.00

VIN1VIN2

C

CIN1IN295.00

10uF10uF

PGND1PGND2

RBias

)

20Ω90.00

%

BIAS(

RCBias

EN110kΩR

RBSBS1uF

EN/SYNC85.00

100Ω

REN21MΩ

FSCBS

Efficiency

CBS80.00

V=6V,V=5V

RFS33kΩ100nFL6.8uHVOUTINOUT

LXVIN=12V,VOUT=5V

CFFR1C

VCCOUT75.00VIN=24V,VOUT=5V

CVCCopt.100kΩ4×22uF

1uFFBVIN=36V,VOUT=5V

R2

RPG24.9kΩ70.00

VINPG0.0010.0100.1001.0004.000

100kΩAGND

OutputCurrent(A)

Figure1.SchematicDiagramFigure2.Efficiencyvs.OutputCurrent

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SA24404

OrderingInformationPinout(topview)

OrderingVIN2

PackageTypeTopMarkCBSRBS

PartNumber

141312

QFN3.5×4-141

BIAS11PGND2

SA24404XNQRoHS-CompliantandHFBxyz

Halogen-Free

x=yearcode,y=weekcode,z=lotnumbercodeVCC2

AGND310LX

FB4

PG59PGND1

678

FSEN/VIN1

SYNC

（QFN3.5×4-14）

PinDescription

PinNumberPinNamePinDescription

InputtointernalLDO.Connectthispintotheoutputpointforimprovedefficiency.

1BIASPlaceaceramiccapacitorwithvalueof1μForhigherbetweenBIASandGNDfor

improvednoiseimmunity.

2VCCDecouplethispintoGNDwithatleasta1µFceramiccapacitor.

3AGNDAnalogground.ConnectthispintobothPGND1andPGND2onthePCB.

OutputFeedbackPin.Connectthispintothecenterpointoftheoutputresistordivider

4FB

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

Powergoodindicator,open-drainoutput.PGisexternallypulledhighwhentheFBpin

voltageisbetween95.5%and115%ofthereferencevoltage.ThePGpinisinternally

5PG

pulledlowwhentheFBpinvoltageislowerthan94%orgreaterthan120%ofthe

referencevoltage.

Oscillatorfrequencyprogrammablepin.Connectanexternalresistortosetthe

6FSswitchingfrequencyfSW.

4

fSW(kHz)=1.346×10/(RFS(kΩ)+0.444).

Enablecontrol.Pullhightoenablethedevice,pulllowtodisablethedevice.Thispin

canbeusedasanadjustableUVLOifitisconnectedtoVINandGNDthroughproper

7EN_SYNCresistors.Donotleavefloating.EN_SYNCalsofunctionsasasynchronizationinput.

Whenitisconnectedtoanexternalclock,theinternaloscillatorsynchronizestothe

externalclock,andthedevicefunctionsinforcedPWMmode.

8VIN1Inputpin1.DecouplethispintoGNDwithatleasta10µFceramiccapacitor.

9PGND1Powergroundpin1.ConnectthispintobothPGND2andAGNDonthePCB.

10LXInductorpin.Connectthispintotheswitchingnodeoftheinductor.

11PGND2Powergroundpin2.ConnectthispintobothPGND1andAGNDonthePCB.

12VIN2Inputpin2.DecouplethispintoGNDwithatleasta10uFceramiccapacitor.

ConnecttoCBSthrougharesistor.ThisresistancecanbeusedtodetermineLXnode

13RBS

risetime.

Bootstrappin.Supplyhighsidegatedriver.Connecta0.1µFcapacitorbetweenthis

14CBS

andtheLXpins.

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SA24404

BlockDiagram

BIASVCCFS

VIN

VIN1

EN

LDOBGOSCHSCurrentVIN2

/SYNCSense

SYNC

detect

CBS

ThermalOTP

protectionRBS

HSCurrent

Sense

SoftSlope

StartCompensation

LX

+Logic

+PWMControl

VREFgm-

FBVCOMPLSCurrent

Sense

-

+Standby

Standby

Ref

PowerGoodLogic

AGNDPGPGND1PGND2

Figure3.BlockDiagram

AbsoluteMaximumRatings

Parameter(Note1)MinMaxUnit

VIN1,VIN2,EN_SYNC,LX,FB,FS,PG-0.340

BIAS-0.316

CBS-LX,RBS-LX-0.34V

VCC-0.34

DynamicLXVoltagein20nsDurationGND-5IN+5

JunctionTemperatureRange-40170

AmbientTemperatureRange-40125

°C

LeadTemperature(Soldering,10s)260

StorageTemperatureRange-65150

ESDSusceptibility

HBM(HumanBodyModel)±2500

V

CDM(ChargedDeviceModel)±750

ThermalInformation

Parameter(Note2)TypUnit

θJAJunction-to-AmbientThermalResistance31.5

θJC(top)Junction-to-Case(Top)ThermalResistance16°C/W

θJBJunction-to-BoardThermalResistance14

PDPowerDissipationTA=25°C4W

RecommendedOperatingConditions

Parameter(Note3)MinMaxUnit

InputVoltage436V

JunctionTemperatureTJ-40150°C

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SA24404

ElectricalCharacteristics

(VIN=12V,TJ=-40°Cto+150°C.TypicalvaluesareatTJ=25°C,unlessotherwisespecified.Thevaluesareguaranteed

bytest,designorstatisticalcorrelation.)

ParameterSymbolTestConditionsMinTypMaxUnit

InputVoltageRangeVIN436V

InputUVLOThresholdVUVLO3.43.9V

InputUVLOhysteresisVHYS0.2V

ENhigh,non-switching,

QuiescentCurrentIQ30µA

TJ=-40°Cto150°C

EN=0V,TJ=25°C1

ShutdownCurrentISHDNµA

EN=0V,TJ=-40°Cto150°C3

FeedbackReferenceVoltageVREFTJ=-40°Cto150°C0.9911.01V

ENRisingThresholdVEN,R1.11.21.3V

ENFallingThresholdVEN,F0.91.01.1V

FBInputCurrentIFBVFB=3V-100100nA

TopFETRONRDS(ON)141mΩ

BottomFETRONRDS(ON)221mΩ

TopFETCurrentLimitIPK_LIM678.9A

BottomFETCurrentLimitIVA_LIM4A

BottomFETReverseCurrent

INEG,RVS1.734.2A

Limit

SwitchingFrequencyProgram

fSW,RNGRFS=5.6k~44.5k3002200kHz

Range

SwitchingFrequencySettingRFS=5.6k1.982.22.42MHz

fSW

AccuracyRFS=44.5k270300330kHz

ClockSyncFrequencyRangefSYNC,RNG(Note4)3002200kHz

VFBfalling,PGfromhightolow91%94%97%VREF

VFBrising,PGfromlowtohigh92.5%95.5%98.5%VREF

PowerGoodThresholdVPG

VFBrising,PGfromhightolow117%120%123%VREF

VFBfalling,PGfromlowtohigh112%115%118%VREF

tPG_FHightolow(Note4)20µs

PowerGoodDelay

tPG_RLowtohigh(Note4)120µs

PowerGoodOutputLowVPG,LIPG=2mA0.3V

PowerGoodHighLeakage

IPG,LK1µA

Current

InternalSoft-StartTimetSS1ms

EdgeHeightforSYNCVEN_SYNCRise/falltime<30ns(Note4)2.4V

BlankingTimeofENafter

tB(Note4)428µs

RisingorFallingEdges

EnableSyncSignalHoldTime

afterEdgeforEdgetSYNC_EDGE(Note4)100ns

Recognition

FrequencySpanofSpread

fSS±5%

SpectrumOperation

RBS=0,IOUT=2A,10%–80%

3ns

(Note4)

LXRiseTimetRISE

RBS=100Ω,IOUT=2A,

18ns

10%–80%(Note4)

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SA24404

MaximumOn-TimetON,MAXfSW=300kHz5.5µs

MinimumOn-TimetON,MIN(Note4)90ns

MinimumOff-TimetOFF,MINfSW=2.2MHz(Note4)90ns

VCCOutputVoltageVCC3.23.33.4V

OutputOvervoltageThresholdVOVPVFBRising115120125%VREF

OutputOvervoltageDelaytOVP,DLY(Note4)20µs

OutputUndervoltage

VUVP50%VREF

ProtectionThreshold

OutputUndervoltageDelaytUVP_DLY(Note4)100µs

ThermalShutdown

TSD160170180°C

Temperature

ThermalShutdownHysteresisTHYS15°C

Note1:Stressesbeyondthe“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thesearestress

ratingsonly.Functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperational

sectionsofthespecificationisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffect

devicereliability.

Note2:θJA,θJCandθJBaremeasuredinthenaturalconvectionatTA=25°Conafour-layerSilergydemoboard.

Note3:Thedeviceisnotguaranteedtofunctionoutsideitsoperatingconditions.

Note4:Guaranteedbydesign.

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SA24404

TypicalPerformanceCharacteristics

(TA=25°C,VIN=12V,VOUT=5V,L=6.8μH,COUT=4×22μF/25V,fSW=400kHz,unlessotherwisenoted.Thecircuitis

shownintheApplicationSchematicsection.)

EfficiencyvsOutputCurrentEfficiencyvsOutputCurrent

(Fsw=400kHz,L=6.8μH/PCMB104T-6R8MS)(Fsw=2.1MHz,L=1.0µH/PCMB104T-1R0MS)

100.00100.00

95.00

95.00

90.00

)

)

90.00

%

%

(

(

85.00

85.0080.00

75.00

Efficiency

80.00Efficiency

VIN=6V,VOUT=5V

VIN=12V,VOUT=5V70.00VIN=6V,VOUT=5V

V=12V,V=5V

75.00VIN=24V,VOUT=5VINOUT

65.00

VIN=36V,VOUT=5VVIN=24V,VOUT=5V

70.0060.00

0.0010.0100.1001.0004.0000.0010.0100.1001.0004.000

OutputCurrent(A)OutputCurrent(A)

LoadTransientLoadTransient

(VIN=12V,VOUT=5V,IOUT=0~2A)(VIN=12V,VOUT=5V,IOUT=0.4~4A)

ΔVOUT=200mV/div

ΔVOUT=100mV/div

IL=2A/divIL=5A/div

Time(200µs/div)Time(200µs/div)

StartupFromVINShutdownFromVIN

(VIN=12V,VOUT=5V,IOUT=0A)(VIN=12V,VOUT=5V,IOUT=0A)

VIN=10V/div

VIN=5V/div

VOUT=2V/div

VOUT=2V/div

VLX=10V/div

VLX=10V/div

IL=1A/div

IL=1A/div

Time(4ms/div)Time(200ms/div)

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SA24404

StartupFromVINShutdownFromVIN

(VIN=12V,VOUT=5V,IOUT=4A)(VIN=12V,