矽力杰 Silergy SY8821B 2.3-5.5V 输入双通道每通道 1.0A 输出高效同步降压稳压器 规格书 (Datasheet)佰祥电子

SY8821B

HighEfficiency2MHz,Dual1.0A

SynchronousStepDownRegulator

GeneralDescriptionFeatures

TheSY8821Bisadualoutput,highefficiency2MHz2.3Vto5.5VInputVoltage

synchronousstepdownDC/DCregulatorcapableof2MHzSwitchingFrequency

deliveringupto1.0Aforeachoutputchannel.The180°OutofPhaseOperation

SY8821BoperatesoverawideinputvoltagerangeOutputCurrent:1.0AforEachChannel

from2.3Vto5.5VandintegratesamainswitchandaLowQuiescentCurrent:Typical45µAfor

synchronousswitchwithverylowRDS(ON)tominimizeBothChannels

theconductionloss.

LowRDS(ON)forInternalSwitches

(PFET/NFET):125mΩ/100mΩ

InternalSoft-start

OrderingInformation100%DropoutOperation

RoHSCompliantandHalogenFree

CompactPackage:DFN2x1.5-8

SY8821□(□□)□

TemperatureCode

PackageCodeApplications

OptionalSpecCode

SSD

CellPhones

OrderingNumberPackagetypeNoteDigitalCameras

SY8821BSACDFN2×1.5-8--PDAs

PortableMediaPlayers

TypicalApplications

Efficiencyvs.OutputCurrent

96

L1

1μH/6.7AV:1.8V/1.0A

VIN:2.3~5.5VOUT1

INLX194

+

RH1CC

CCINff1OUT1

e100kΩ22pF/50V10μF/10V

100μF/16V10μF/10VGND92

FB1)

RL1%

(

90

49.9kΩ

y

SY8821Bc

L

2n88

1μH/6.7Ae

VOUT2:1.8V/1.0Ai

c

LX2i

f

f

RH286

Cff2COUT2E

100kΩ

EN222pF/50V10μF/10V

FB2

84

EN1RL2

VIN=3.3V,VOUT=1.8V

R49.9kΩ

EN2REN182V=4.2V,V=1.8V

1MΩ1MΩINOUT

VIN=5.0V,VOUT=1.8V

80

0.010.11

OutputCurrent(A)

Figure1.SchematicDiagramFigure2.Efficiencyvs.OutputCurrent

SY8821BRev.0.9SilergyCorp.Confidential-PreparedforCustomerUseOnly1

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SY8821B

Pinout(topview)

GND18LX2

LX127EN2

9

IN36EN1

IN

FB145FB2

(DFN2x1.5-8)

TopMark:XdxyzforSY8821BSAC(devicecode:Xd,x=yearcode,y=weekcode,z=lotnumbercode)

PinNamePinNumberPinDescription

GND1Groundpin.

LX12Inductorpinforoutput1.Connectthispintotheswitchingnodeoftheinductor.

Powerinputpin.DecouplethispintotheGNDpinwithatleasta10µFceramic

IN3

capacitor.

Feedbackpinforoutput1.Connectthispintothecenterpointoftheoutput

FB14resistordivider(asshowninfigure1)toprogramtheoutput1voltage:

VOUT1=0.6V×(1+RH1/RL1)

Feedbackpinforoutput2.Connectthispintothecenterpointoftheoutput

FB25resistordivider(asshowninFigure1)toprogramtheoutput2voltage:

VOUT2=0.6V×(1+RH2/RL2)

EN16Enablepinforoutput1.Donotleaveitfloating.

EN27Enablepinforoutput2.Donotleaveitfloating.

LX28Inductorpinforoutput2.Connectthispintotheswitchingnodeoftheinductor.

IN9Powerinputpin.ConnectthispintotheINpin.Donotleaveitfloating.

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SY8821B

BlockDiagram

ININ

Internal

InputUVLO

PowerCurrent

Sensor

EN1

Control

Logic1

LX1

FB1-

0.6V+

Thermal

Sensor

GND

IN

IN

Internal

InputUVLO

PowerCurrent

Sensor

EN2

Control

Logic2

LX2

FB2-

0.6V+

Thermal

Sensor

GND

Figure3.BlockDiagram

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SY8821B

AbsoluteMaximumRatings(Note1)

AllPins-------------------------------------------------------------------------------------------------------------------------6V

LXVoltage----------------------------------------------------------------------------------------------------0.3V（*1）to6V（*2）

PowerDissipation,PD@TA=25°C,DFN2×1.5-8-----------------------------------------------------------------------1.2W

PackageThermalResistance(Note2)

θJA---------------------------------------------------------------------------------------------------------------80°C/W

θJC---------------------------------------------------------------------------------------------------------------15°C/W

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

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

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

(*1)LXVoltageTestedDownto-3V<40ns

(*2)LXVoltageTestedUpto+7V<40ns

RecommendedOperatingConditions(Note3)

SupplyInputVoltage-------------------------------------------------------------------------------------------------2.3Vto5.5V

Enable,FBVoltage------------------------------------------------------------------------------------------------------VIN+0.3V

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

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

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SY8821B

ElectricalCharacteristics

(VIN=5V,VOUT1=VOUT2=2.5V,L1=L2=1.0µH,COUT1=COUT2=10µF,TA=25°C,unlessotherwisespecified)

ParameterSymbolTestConditionsMinTypMaxUnit

InputVoltageRangeV2.35.5V

IN

InputUVLORisingThresholdV2.3V

UVLO,RISING

InputUVLOFallingThresholdV2.0V

UVLO,FALLING

EN1=1orEN2=1,

35µA

IOUT1=IOUT2=0,noswitching

QuiescentCurrentIQ

EN1=1andEN2=1,

45µA

IOUT1=IOUT2=0,noswitching

ShutdownCurrentIV=V=0V0.11µA

SHDNEN1EN2

FeedbackReferenceVoltageVREF1,VREF2588600612mV

RDS(ON),TOP1

TopFETRON125mΩ

RDS(ON),TOP2

RDS(ON),BOT1

BottomFETRON100mΩ

RDS(ON),BOT2

EN1,EN2InputVoltageHighV,V1.2V

EN1,HEN2,H

EN1,EN2InputVoltageLowV,V0.4V

EN1,LEN2,L

Soft-startTimet,t1.0ms

SS1SS2

SwitchingFrequencyFI=0.5A,I=0.5A2.0MHz

SWOUT1OUT2

CH1TopFETCurrentLimitI1.3A

LMT,TOP1

CH2TopFETCurrentLimitI1.3A

LMT,TOP2

ThermalShutdownTemperatureT150˚C

SD

ThermalShutdownHysteresisT20˚C

HYS

Note1:Stressesbeyondthe“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Theseare

stressratingsonly.Functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedinthe

operationalsectionsofthespecificationisnotimplied.Exposuretoabsolutemaximumratingconditionsfor

extendedperiodsmayaffectdevicereliability.

Note2:θJAofSY8821BSACismeasuredinthenaturalconvectionatTA=25°Con2OZtwo-layerSilergy

evaluationboard.PaddleofQFN2x1.5-8packageisthecasepositionforSY8821BSACθJCmeasurement.

Note3:Thedeviceisnotguaranteedtofunctionoutsideitsoperatingconditions.

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SY8821B

DFN2×1.5-8PackageOutlineDrawing