矽力杰 Silergy SY8843 2.7-5.5V 输入 3A 输出高效同步降压稳压器 规格书 (Datasheet)佰祥电子

SY8843/SY8843L

HighEfficiency1.5MHz,3A

UltraFastDynamicResponseSynchronousStepDownRegulator

`

GeneralDescriptionFeatures

TheSY8843andSY8843Larehighefficiency1.5MHz2.7~5.5VInputVoltageRange

synchronousstepdownDC/DCregulatorscapableof65µALowQuiescentCurrent

deliveringupto3Aoutputcurrent.TheSY8843andUltraFastLoadTransientSpeed

SY8843LcanoperateoverawideinputvoltagerangeLowRDS(ON)forInternalSwitches(Top/Bottom)

from2.7Vto5.5Vandintegratemainswitchand85mΩ/50mΩ

synchronousswitchwithverylowRDS(ON)tominimizeHighSwitchingFrequency1.5MHzMinimizes

theconductionloss.theExternalComponents

InternalSoft-startLimitstheInrushCurrent

Lowoutputvoltageripple,smallexternalinductorand

ReliableShortCircuitProtection

capacitorsizesareachievedwith1.5MHzswitching

SY8843:Hic-cupModeProtection

frequency.

SY8843L:LatchOffProtection

ReliableOVPandOTPProtection

OrderingInformationSY8843:NoLatchOffProtection

SY8843L:LatchOffProtection

SY8843□(□□)□OutputAutoDischargeFunction

TemperatureCodeRoHSCompliantandHalogenFree

PackageCodeCompactPackage:QFN1.5×1.5-7

OptionalSpecCode

OrderingNumberPackagetypeNote

SY8843QWCQFN1.5×1.5---Applications

7

SY8843LQWCQFN1.5×1.5---SmartPhone

7LCDTV

SetTopBox

Mini-notebookPC

AccessPointRouter

TypicalApplications

Efficiencyvs.OutputCurrent

95

SY8843/SY8843L

L：0.68µH

90

VIN:2.7V~5.5V56VOUT:1.8V

INLX

R:

PG)

RH:

100k%

32(

85

CINPGOUT100kCOUT

y

22µF/6.3V22µF/6.3Vc

n

41e

i

ENFBc

i80

f

f

E

GNDRL:

49.9kVIN=3.3V,VOUT=1.8V

775

VIN=4.2V,VOUT=1.8V

VIN=5.0V,VOUT=1.8V

70

0.0010.010.1110

OutputCurrent(A)

Figure1.SchematicDiagramFigure2.Efficiencyvs.LoadCurrent

SY8843/SY8843LRev.1.0DSilergyCorp.Confidential-PreparedforCustomerUseOnly1

©2018SilergyCorp.AllRightsReserved.

SY8843/SY8843L

Pinout(TopView)

FB17GND

OUT26LX

345

PGENIN

(QFN1.5×1.5-7)

TopMark:VtxyzforSY8843QWC(devicecode:Vt,x=yearcode,y=weekcode,z=lotnumbercode)

dHxyzforSY8843LQWC(devicecode:dH,x=yearcode,y=weekcode,z=lotnumbercode)

PinNamePinNumberPinDescription

Feedbackpin.Connectthispintothecenterpointoftheoutputresistor

FB1divider(asshowninFigure1)toprogramtheoutputvoltage:

VOUT=0.6V×(1+RH/RL)

OUT2Outputfeedbackpin,connecttotheoutputcapacitorside.

Powergoodindicator(opendrainoutput).Lowiftheoutput<90%orthe

PG3output>120%ofregulationvoltage;Highotherwise.Connectapull-up

resistortotheinput.

EN4Enablecontrol.Pullhightoturnon.Donotleaveitfloating

IN5Inputpin.DecouplethispintoGNDpinwithatleasta22µFceramiccap.

LX6Inductorpin.Connectthispintotheswitchingnodeofinductor.

GND7Groundpin.

SY8843/SY8843LRev.1.0DSilergyCorp.Confidential-PreparedforCustomerUseOnly2

©2018SilergyCorp.AllRightsReserved.

SY8843/SY8843L

BlockDiagram

IN

Internal

InputUVLO

PowerCurrent

Sensor

EN

LX

FB-

0.6V+

Control

Logic

OUT

Current

Sensor

SoftStartGND

PGThermal

Sensor

Figure3.SY8843andSY8843LBlockDiagram

AbsoluteMaximumRatings(Note1)

SupplyInputVoltage------------------------------------------------------------------------------------------0.3Vto6.0V

EN,FB,PG,OUTVoltage-----------------------------------------------------------------------------------0.3VtoVIN+0.6V

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

PowerDissipation,PD@TA=25°C,

QFN1.5×1.5-7--------------------------------------------------------------------------------------------------------1.5W

PackageThermalResistance(Note2)

θJA----------------------------------------------------------------------------------------------------------------66°C/W

JC-----------------------------------------------------------------------------------------------------------------5°C/W

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

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

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

(*1)LXVoltageTestedDownto-3V<20ns

(*2)LXVoltageTestedUpto+7V<20ns

RecommendedOperatingConditions(Note3)

SupplyInputVoltage--------------------------------------------------------------------------------------------2.7Vto5.5V

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

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

SY8843/SY8843LRev.1.0DSilergyCorp.Confidential-PreparedforCustomerUseOnly3

©2018SilergyCorp.AllRightsReserved.

SY8843/SY8843L

ElectricalCharacteristics

(VIN=5.0V,VOUT=1.8V,L=0.68µH,COUT=22µF,TA=25°C,unlessotherwisespecified)

ParameterSymbolTestConditionsMinTypMaxUnit

InputVoltageRangeVIN2.75.5V

InputUVLOThresholdVUVLO2.7V

InputUVLOHysteresisVHYS0.18V

QuiescentCurrentIQVFB=VREF×105%65µA

ShutdownCurrentISHDNVEN=0V0.11µA

FeedbackReferenceVoltageVREFIOUT=1.0A594600606mV

OutputDischargeResistanceRDIS75Ω

TopFETRONRDS(ON)185mΩ

BottomFETRONRDS(ON)250mΩ

ENInputVoltageHighVEN,H1.1V

ENInputVoltageLowVEN,L0.4V

PGThresholdforUnderVoltageVfalling,PGfrom

VFB90%V

DetectionPG,UVhightolowREF

PGLowDelayTimeforUnder

t15µs

VoltageDetectionPG,UV

PGThresholdforOverVoltageVrising,PGfrom

VFB120%V

DetectionPG,OVhightolowREF

PGLowDelayTimeforOver

t10µs

VoltageDetectionPG,OV

MinONTimetON,MIN100ns

MaximumDutyCycleDMAX100%

fromENhightoLX

TurnOnDelayt90µs

ON,DLYstartswitching

Soft-startTimetSS0.35ms

SwitchingFrequencyFSWIOUT=1.0A1.5MHz

TopFETCurrentLimitILMT,TOP4A

BottomFETCurrentLimitILMT,BOT3A

OutputUnderVoltageProtection

V40%V

ThresholdUVPREF

OutputUVPDelaytUVP,DLY15µs

OutputOverVoltageProtection

VSY8843L120%V

ThresholdOVPREF

OutputOVPDelayVOVP,DLYSY8843L10µs

ThermalShutdownTemperatureTSD150℃

ThermalShutdownHysteresisTHYSSY884315℃

SY8843/SY8843LRev.1.0DSilergyCorp.Confidential-PreparedforCustomerUseOnly4

©2018SilergyCorp.AllRightsReserved.

SY8843/SY8843L

Note1:Stressesbeyondthe“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Theseare

stressratingsonly.Functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedinthe

operationalsectionsofthespecificationisnotimplied.Exposuretoabsolutemaximumratingconditionsforextended

periodsmayaffectdevicereliability.

Note2:θJAofSY8843andSY8843LaremeasuredinthenaturalconvectionatTA=25°Con2OZtwo-layerSilergy

evaluationboard.Pin6isthecasepositionforSY8843andSY8843LθJCmeasurement.

Note3:Thedeviceisnotguaranteedtofunctionoutsideitsoperatingconditions.

SY8843/SY8843LRev.1.0DSilergyCorp.Confidential-PreparedforCustomerUseOnly5

©2018SilergyCorp.AllRightsReserved.

SY8843/SY8843L

TypicalPerformanceCharacteristics

Efficiencyvs.OutputCurrentEfficiencyvs.OutputCurrent

10095

95

90

90

)

)

%

%

(

(

85

y

y85

c

c

n

n

e

e

i

i

c

c80

i

i80

f

f

f

f

E

E

75

VIN=3.3V,VOUT=1.8V

VIN=3.3V,VOUT=1.2V75

VIN=4.2V,VOUT=1.8V

70VIN=4.2V,VOUT=1.2V

VIN=5.0V,VOUT=1.8V

VIN=5.0V,VOUT=1.2V

6570

0.0010.010.11100.0010.010.1110

OutputCurrent(A)OutputCurrent(A)

Efficiencyvs.OutputCurrentVOUTvs.Temperature

981.210

961.208

94

)1.206

V

)

92(

e

%

g

(1.204

a

y

t

90l

c

o

n1.202

V

e

i

88t

c

i

u

f

f

p1.200

t

E

86u

O1.198

84VIN=4.2V,VOUT=3.3V

VIN=5.0V,VOUT=3.3V

821.196

801.194

0.0010.010.11100510152025303540455055606570758085

OutputCurrent(A)Temperature(℃)

OutputRippleOutputRipple

(VIN=5.0V,VOUT=1.8V,IO=3.0A)(VIN=5.0V,VOUT=1.8V,IO=50mA)

∆VOUT20mV/div