矽力杰 Silergy SY9701A 升降压转换器 规格书 Datasheet 佰祥电子

SY9701A

HighEfficiency,1MHz，1.2A

Buck-BoostDC/DCRegulator

GeneralDescriptionFeatures

TheSY9701Aisawideinputvoltagerange,highFixedFrequencyOperationwithBattery

efficiency,fixedfrequencybuck-boostconverterthatVoltageAbove,BeloworEqualtoTheOutput

operatesfrominputvoltageabove,beloworequaltoFourInternalPowerSwitchestoFormTrue4-

theoutputvoltage.ItprovidesapowersupplyforSwitchesBuck-BoostwithSingleInductor

systempoweredbyeitheratwo-cellorthree-cellSeamlessBuck-BoostTransition

alkaline,Ni-CdorNi-MHbattery,oraone-cellLi-Ion

2.6Vto5.5VInputVoltageRange

orLi-polymerbattery.

1.2AContinuousOutputCurrentCapability

OutputDisconnectatShutdown

TheSY9701Acansupportfor1.2Aloadcurrent

capability.Itisbasedonafixedfrequency,pulse-PowerGoodIndicator

width-modulation(PWM)controllerusingsynchronousCompactPackage:DFN33-14

rectificationtoobtainmaximumefficiency.TheoutputBuiltInThermalShutDownProtection,Hard

voltageandcompensationcircuitcanbeprogrammedShortProtection

usingexternalresistorsandcapacitorsnetwork.During

shutdown,theloadisdisconnectedfromthebattery.

ThedeviceispackagedintightDFN33-14.Applications

PalmtopComputers

OrderingInformationHandheldInstruments

SY9701□(□□)□MP3/MP4Players

TemperatureCodeDigitalCameras/Camcorders

PackageCodePersonalMedicalProducts

OptionalSpecCodeHighPowerLED’s

OrderingNumberPackagetypeNoteAlltwo-cellandthree-cellalkaline,Ni-Cdor

SY9701ADPCDFN33-14----Ni-MHorsignal-cellLibatterypowered

products

TypicalApplications

CINEfficiencyvs.LoadCurrent

22uFx2

100

VIN:2.6V~5.5V

L2.2uH95

114

0PVINLX1

1uF90

213)

SVINPGND

%

(

y85

VOUT:3.3V312

OUTLX2c

n

e

R1i80

411100kc

i

100kGNDPGVINf

ENf

C:E

OUT51075

22uFx2FBISETVIN=3.0V,VOUT=3.3V

VIN=3.3V,VOUT=3.3V

R269

COMPSS70VIN=4.2V,VOUT=3.3V

22.1k150k10nF

20k7820nF

SGNDNC65

0.00010.0010.010.1110

2.2nF

LoadCurrent(A)

Figure1.SchematicdiagramFigure2.EfficiencyFigure

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SY9701A

Pinout(topview)

DFN3x3-14

TopMark:WQxyz(devicecode:WQ,x=yearcode,y=weekcode,z=lotnumbercode)

PinNamePinNumberDescription

Powerinputpin.DecouplethispintoGNDwithatleasta22μFceramic

PVINlcap.Minimizetheloopareaformedbyinputcap,PVINpinandGND

paddles.

Signalpowerinputpin.DecouplethispintoGNDwithatleasta1μF

SVIN2

ceramiccap.

Outputofthesynchronousrectifier.DecouplethispintoGNDwithatleast

OUT3a22μFceramiccap.Minimizetheloopareaformedbyoutputcap,OUTpin

andGNDpaddles.

Enablecontrol.Pullhightoturnon.Internalintegratedwith1MΩpull-

EN4

downresistor.

Outputfeedbackpin.Connectthispintothecenterpointoftheoutput

FB5

resistordividertoprogramtheoutputvoltage.

COMP6Externalcompensationforvoltageloop.

SGND7Signalgroundpin.

NC8Notconnected.

SS9Connectthispintoasoft-startcapacitortoprogramsoft-starttime.

Applyaresistorandcapacitorparallelnetworktosensetheoutputaverage

ISET10current.IfVISETislowerthan0.1V,ICwillgointoPFMmode.Donotletit

floating.TietogroundforforcedPWMoperation.

PG11Powergoodindicator.

Inductorconnection2.Connectthisnodetotheswitchingnodeofthe

LX212

inductor.

PGND13Powergroundpin.

Inductorconnection1Connectthisnodetotheswitchingnodeofthe

LX114

inductor.

GNDPaddlePowerground.

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SY9701A

AbsoluteMaximumRatings(Note1)

OUT-----------------------------------------------------------------------------------------------------------------------------4V

AllOtherPins-------------------------------------------------------------------------------------------------------------------6V

PowerDissipation,PD@TA=25°CDFN33--------------------------------------------------------------------------3.3W

PackageThermalResistance(Note2)

θJA--------------------------------------------------------------------------------------------------------------38°C/W

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

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

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

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

RecommendedOperatingConditions(Note3)

SupplyInputVoltage--------------------------------------------------------------------------------------------2.6Vto5.5V

OutputVoltage-----------------------------------------------------------------------------------------------------2.6Vto3.8V

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

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

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SY9701A

ElectricalCharacteristics

(VIN=4.2V,VOUT=3.3V,L=2.2μH,COUT=22μF2,TA=25°C,IOUT=1Aunlessotherwisespecified)

ParameterSymbolTestConditionsMinTypMaxUnit

InputVoltageRangeVIN2.65.5V

OutputVoltageRangeVOUT2.63.8V

IOUT=0,EN=1,

QuiescentCurrentIQISET=150kΩ,60100µA

FB=105%VREF

ShutdownCurrentISHDNEN=00.11µA

FeedbackReferenceVoltageVREF0.5910.60.609V

NFETRDS(ON)RDS(ON)1100mΩ

PFETRDS(ON)RDS(ON)2100mΩ

InputPeakCurrentLimitILIM3.54A

OutputNegativeCurrentLimitINEG-1A

Soft-starttime:

0.7V

Soft-startCurrentISStssCss5µA

Iss

ENRisingThresholdVENH1.5V

ENFallingThresholdVENL0.4V

InputUVLORisingThresholdVUVLO2.452.55V

UVLOHysteresisVHYS0.2V

PGUnder-voltageThresholdVFB,UV0.48V

PGOver-voltageThresholdVFB,OV0.72V

OutputCurrentSenseISETIOUT=1A5µA

OutputVoltageOverProtectionVOVP125%

OVPProtectionDelayTimetOVP_delay16µs

ISETPinThresholdforPFM

V0.080.10.12V

ModePFM

OscillatorFrequencyfOSCIOUT=1.0A0.81.01.2MHz

MinDutyCycleBoost&Buck10%

MaxDutyCycleBoost&Buck90%

ThermalShutdownTemperatureTSD150°C

ThermalShutdownHysteresisTHYS15°C

Note1:Stressesbeyondthe“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Theseare

stressratingsonly.Functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedinthe

operationalsectionsofthespecificationisnotimplied.Exposuretoabsolutemaximumratingconditionsfor

extendedperiodsmayaffectdevicereliability.

Note2:θJAismeasuredinthenaturalconvectionatTA=25°Conaloweffectivesinglelayerthermal

conductivitytestboardofJEDEC51-3thermalmeasurementstandard.PaddleofDFN3X3-14packagesisthecase

positionforJCmeasurement.

Note3:Thedeviceisnotguaranteedtofunctionoutsideitsoperatingconditions.

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SY9701A

TypicalPerformanceCharacteristics

LoadTransient

Efficiencyvs.LoadCurrent

(VIN=3.0V,VOUT=3.3V,ILOAD=0.2~1.2A)

100

95

VOUT(AC)500mV/div

90

)

%

(IL0.5A/div

y85

c

n

e

i80

c

i

f

f

E

75

VIN=3.0V,VOUT=3.3V

VIN=3.3V,VOUT=3.3V

70VIN=4.2V,VOUT=3.3V

65

0.00010.0010.010.1110

Time(200μs/div)

LoadCurrent(A)

OutputRippleOutputRipple

(VIN=3.0V,VOUT=3.3V,ILOAD=0.6A)(VIN=3.0V,VOUT=3.3V,ILOAD=1.2A)

VOUT(AC)20mV/divVOUT(AC)50mV/div

VLX2V/divVLX2V/div

IL1A/div

IL1A/div

Time(1μs/div)Time(1μs/div)

StartupFromEnableShutdownFromEnable

(VIN=3.0V,VOUT=3.3V,ILOAD=1.2A)(VIN=3.0V,VOUT=3.3V,ILOAD=1.2A)

EN2V/divEN2V/div

VOUT2V/divVOUT2V/div

VLX5V/divVLX5V/div

IL1A/divIL1A/div

Time(2ms/div)Time(200μs/div)

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SY9701A

StartupFromVINShutdownFromVIN

(VIN=3.0V,VOUT=3.3V,ILOAD=1.2A)(VIN=3.0V,VOUT=3.3V,ILOAD=1.2A)

VIN2V/div

VIN2V/div

VOUT2V/div

VOUT2V/divVLX5V/div

VLX5V/div

IL1A/divIL1A/div

Time(2ms/div)Time(200μs/div)

ShortCircuitProtectionShortCircuitProtection

(VIN=3.0V,VOUT=3.3V,0AtoShort)(VIN=3.0V,VOUT=3.3V,1.2AtoShort)

VOUT2V/div

VOUT2V/div

IL1A/div

IL1A/div

Time(2ms/div)Time(2ms/div)

OutputRippleOutputRipple

(VIN=3.6V,VOUT=3.3V,ILOAD=0.6A)(VIN=3.6V,VOUT=3.3V,ILOAD=1.2A)

VOUT(AC)10mV/divVOUT(AC)20mV/div

VLX2V/div

VLX2V/div

IL0.5A/divIL1A/div

Time(1μs/div)Time(1μs/div)

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SY9701A

StartupFromEnableShutdownFromEnable

(VIN=3.6V,VOUT=3.3V,ILOAD=1.2A)(VIN=3.6V,VOUT=3.3V,ILOAD=1.2A)

EN2V/divEN2V/div

VOUT2V/div

VOUT2V/div

VLX5V/div

VLX5V/div

IL1A/divIL1A/div

Time(400μs/div)Time(400μs/div)

StartupFromVINShutdownFromVIN

(VIN=3.6V,VOUT=3.3V,ILOAD=1.2A)(VIN=3.6V,VOUT=3.3V,ILOAD=1.2A)

VIN2V/div

VIN2V/div