矽力杰 Silergy SY8831 2.5-5.5V 输入双通道每通道 1A 输出高效同步降压稳压器 规格书 (Datasheet)佰祥电子

SY8831

HighEfficiency1.5MHz,

Dual1ASynchronousStepDownRegulator

GeneralDescriptionFeatures

TheSY8831isadualoutput,highefficiency1.5MHz2.5Vto5.5VInputVoltage

synchronousstepdownDC/DCregulatorcapableof1.5MHzSwitchingFrequency

deliveringupto1Aoutputcurrentforeachoutput180°OutofPhaseOperation

channel.TheSY8831operatesoverawideinputOutputCurrent:1AperChannel

voltagerangefrom2.5Vto5.5VandintegratesmainQuiescentCurrent:Typical55µAforbothChannels

switchandsynchronousswitchwithverylowRDS(ON)

LowRDS(ON)forInternalSwitches(PFET/NFET):

tominimizetheconductionloss.260mΩ/180mΩ

InternalSoft-start

100%DropoutOperation

OrderingInformationRoHSCompliantandHalogenFree

SY8831□(□□)□CompactPackage:TSOT23-8

TemperatureCode

PackageCode

OptionalSpecCodeApplications

SSD

OrderingNumberPackagetypeNoteCellPhones

SY8831AICTSOT23-8--DigitalCameras

PDAs

PortableMediaPlayers

TypicalApplications

Efficiencyvs.OutputCurrent(CH1)

L196

2.2μH/2.3A

VIN:2.5~5.5VVOUT1:1.8V

INLX194

+RH1

Cff1

CCCOUT1

eIN100k22pF/50V

10μF/10V10μF/10V92

100μF/16VGNDFB1

)

RL1%90

(

49.9k

y

SY8831c

L2

n88

e

2.2μH/2.3Ai

VOUT2:1.8V

c

i

LX2f

f86

R

H2E

Cff2C

100kOUT2

EN222pF/50V10μF/10VV=3.3V,V=1.8V

FB284INOUT

VIN=4.2V,VOUT=1.8V

EN1RL2

82VIN=5.0V,VOUT=1.8V

REN2REN149.9k

1M1M

80

1101001000

OutputCurrent(mA)

Figure1.SchematicDiagramFigure2.Efficiencyvs.OutputCurrent

SY8831Rev.0.9ASilergyCorp.Confidential-PreparedforCustomerUseOnly1

©2018SilergyCorp.AllRightsReserved.

SY8831

Pinout(topview)

FB118FB2

IN27EN1

LX136EN2

GND45LX2

(TSOT23-8)

TopMark:Nbxyz(Devicecode:Nb,x=yearcode,y=weekcode,z=lotnumbercode)

PinNamePinNumberPinDescription

Feedbackpinforchannel1.Connectthispintothecenterpointoftheoutput

FB11resistordivider(asshowninFigure1)toprogramtheoutputvoltageofchannel1:

VOUT1=0.6V×(1+RH1/RL1)

Powerinputpin.Decouplethispintogroundpinwithatleasta10µFceramic

IN2

capacitor.

LX13Inductorpinforoutput1.Connectthispintotheswitchingnodeofinductor.

GND4Groundpin.

LX25Inductorpinforchannel2.Connectthispintotheswitchingnodeofinductor.

EN26Enablepinforchannel2.Donotleaveitfloating.

EN17Enablepinforchannel1.Donotleaveitfloating.

Feedbackpinforchannel2.Connectthispintothecenterpointoftheoutput

FB28resistordivider(asshowninFigure1)toprogramtheoutputvoltageofchannel2:

VOUT2=0.6V×(1+RH2/RL2)

SY8831Rev.0.9ASilergyCorp.Confidential-PreparedforCustomerUseOnly2

©2018SilergyCorp.AllRightsReserved.

SY8831

FunctionBlock

IN

InternalInputUVLO

Power2.5V

CurrentSense

FB1

0.6V

LX1

EN1

1.5V

0CLKCH1

1.5MHz

Oscillator

180CLKCH2GND

IN

InternalSSTPWMControl

&ProtectLogic

Thermal

Protection

CurrentSense

FB2

LX2

0.6V

EN2

1.5V

Figure3.BlockDiagram

SY8831Rev.0.9ASilergyCorp.Confidential-PreparedforCustomerUseOnly3

©2018SilergyCorp.AllRightsReserved.

SY8831

AbsoluteMaximumRatings(Note1)

SupplyInputVoltage-----------------------------------------------------------------------------------------------0.3Vto6V

EN1,EN2,FB1,FB2Voltage----------------------------------------------------------------------------------0.3VtoVIN+0.6V

LX1,LX2Voltage--------------------------------------------------------------------------------------------0.3V（*1）to6V（*2）

PowerDissipation,PD@TA=25°CTSOT23-8--------------------------------------------------------------------1.8W

PackageThermalResistance(Note2)

θJA---------------------------------------------------------------------------------------------------------55°C/W

θJC-----------------------------------------------------------------------------------------------------------8°C/W

JunctionTemperatureRange-----------------------------------------------------------------------------------------150°C

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

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

(*1)LX1,LX2voltagetesteddownto-3V<20ns

(*2)LX1,LX2voltagetestedupto+7V<20ns

RecommendedOperatingConditions(Note3)

SupplyInputVoltage-------------------------------------------------------------------------------------------2.5Vto5.5V

EN1,EN2,FB1,FB2Voltage------------------------------------------------------------------------------------VIN+0.3V

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

AmbientTemperatureRange---------------------------------------------------------------------------------40°Cto85°C

SY8831Rev.0.9ASilergyCorp.Confidential-PreparedforCustomerUseOnly4

©2018SilergyCorp.AllRightsReserved.

SY8831

ElectricalCharacteristics

(VIN=5V,VOUT1=VOUT2=2.5V,L1=L2=2.2µH,COUT1=COUT2=10µF,TA=25°Cunlessotherwisespecified)

ParameterSymbolTestConditionsMinTypMaxUnit

InputVoltageRangeVIN2.55.5V

ShutdownCurrentISHDNEN1=EN2=00.11µA

QuiescentCurrentIQEN1=1orEN2=1,45µA

IOUT1=IOUT1=0,noswitching

EN1=1andEN2=1,55µA

IOUT1=IOUT2=0,noswitching

InputUVLOThresholdVUVLO2.45V

UVLOHysteresisVHYS0.2V

OscillatorFrequencyFOSCPWMoperation1.5MHz

ThermalShutdownTSD150°C

Temperature

ThermalShutdownTHYS20°C

Hysteresis

FeedbackReferenceVREF1,VREF20.5880.6000.612V

Voltage

PFETRONRDS(ON),P1260mΩ

RDS(ON),P2

NFETRONRDS(ON),N1180mΩ

RDS(ON),N2

PFETCurrentLimitILIM1,ILIM21.35A

ENRisingThresholdVENH1,VENH21.2V

ENFallingThresholdVENL1,VENL20.4V

OutputDischargeSwitchRDISCH1,RDISCH235Ω

OnResistance

PFETMinOntimetON80ns

InternalSoft-startTimetSS1,tSS21ms

Note1:Stressesbeyondthe“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Theseare

stressratingsonly.Functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedinthe

operationalsectionsofthespecificationisnotimplied.Exposuretoabsolutemaximumratingconditionsfor

extendedperiodsmayaffectdevicereliability.

Note2:PackagethermalresistanceofSY8831AICismeasuredinthenaturalconvectionatTA=25°Conafour-

layerSilergyevaluationboard.

Note3:Thedeviceisnotguaranteedtofunctionoutsideitsoperatingconditions

SY8831Rev.0.9ASilergyCorp.Confidential-PreparedforCustomerUseOnly5

©2018SilergyCorp.AllRightsReserved.

SY8831

TSOT23-8PackageOutlineDrawing

TopviewSideviewA

SideviewBRecommendedPCBlayout

(Referenceonly)

Notes:Alldimensioninmillimeterandexcludemoldflash&metalburr

SY8831Rev.0.9ASilergyCorp.Confidential-PreparedforCustomerUseOnly6

©2018SilergyCorp.