600mA超低噪音小封装快速CMOSLDO稳压器LP3983H.docx

600mA超低噪音小封装快速CMOSLDO稳压器LP3983H.docx

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600mA超低噪音小封装快速CMOSLDO稳压器LP3983H

600mA,Ultra-lownoise,SmallPackage

Ultra-FastCMOSLDORegulator

GeneralDescription

TheLP3983HisdesignedforportableRFandwirelessapplicationswithdemandingperformanceandspacerequirements.TheLP3983Hperformanceisoptimizedforbattery-poweredsystemstodeliverultralownoiseandlowquiescentcurrent.Regulatorgroundcurrentincreasesonlyslightlyindropout,furtherprolongingthebatterylife.TheLP3983Halsoworkswithlow-ESRceramiccapacitors,reducingtheamountofboardspacenecessaryforpowerapplications,criticalinhand-heldwirelessdevices.TheLP3983Hconsumeslessthan0.01µAinshutdownmodeandhasfastturn-ontimelessthan50µs.Theotherfeaturesincludeultralowdropoutvoltage,highfeedbackaccuracy,currentlimitingprotection,andhighripplerejectionratio.Itisavailableinthe5-leadofSOT23-5andSOT89-5packages.

OrderingInformation

LP3983H□□□□

F:

Pb-Free

PackageType

B5:

SOT23-5

X5:

SOT89-5

OutputType

A：

Adjustable

Features

◆Ultra-Low-NoiseforRFApplication

◆2.2V-6VInputVoltageRange

◆LowDropout:

280mV@400mA

◆600mAOutputCurrent,750mAPeakCurrent

◆HighPSRR:

-68dBat1KHz

◆<0.01uAStandbyCurrentWhenShutdown

◆AvailableinSOT23-5andSOT89-5Package

◆Ultra-FastResponseinLine/Loadtransient

◆CurrentLimitingandThermalShutdownProtection

◆Quickstart-up（typically20uS）

TypicalApplicationCircuit

Applications

✧PortableMediaPlayers/MP3players

✧CellularandSmartmobilephone

✧LCD

✧DSCSensor

✧WirelessCard

PinConfigurations

Device

Marking

Package

Shipping

LP3983HAB5F

LP3983HAX5F

SOT23-5

SOT89-5

3K/REEL

MarkingInformation

FunctionalPinDescription

PinName

SOT23-5

SOT89-5

PinFunction

VIN

1

1

PowerInputVoltage.

GND

2

2

Ground.

EN

3

5

ChipEnable（ActiveHigh）.Thereisanintegratedpulllow1MΩresistorconnectedtoGNDwhentheENpinisfloating.

ADJ

4

4

Feedbackpin.Thereferencevoltageis0.8V.

VOUT

5

3

OutputVoltage.Vout=VFB×（1+R1/R2），whichVFB=0.8V

FunctionBlockDiagram

AbsoluteMaximumRatings

SupplyInputVoltage--------------------------------------------------------------------------------------------0.3Vto6.5V

ENPinVoltage----------------------------------------------------------------------------------------------0.3VtoVin+0.3V

PowerDissipation,PD@TA=25°C

SOT23-5-----------------------------------------------------------------------------------------------------------------450mW

SOT89-5-----------------------------------------------------------------------------------------------------------------700mW

PackageThermalResistance

SOT23-5,θJA----------------------------------------------------------------------------------------------------------250°C/W

SOT89-5,θJA----------------------------------------------------------------------------------------------------------165°C/W

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

StorageTemperatureRange---------------------------------------------------------------------------−40°Cto150°C

ESDSusceptibility

HBM（HumanBodyMode）------------------------------------------------------------------------------------------------2kV

MM（Machine-Mode）--------------------------------------------------------------------------------------------------------200V

RecommendedOperatingConditions

SupplyInputVoltage-------------------------------------------------------------------------------------------------2.2Vto6V

OperationAmbientTemperatureRange-----------------------------------------------------------------−20°Cto85°C

ElectricalCharacteristics

（VIN=VOUT+1V,CIN=COUT=2.2µF,CFB=22pF,TA=25°C,unlessotherwisespecified）

Parameter

Symbol

TestConditions

Min

Typ.

Max

Units

OutputLoadingCurrent

ILOAD

VEN=VIN,VIN>2.5V

600

mA

CurrentLimit

ILIM

RLOAD=1Ω

750

mA

Adjustablevoltagereference

VFB

IOUT=1mA

0.784

0.8

0.816

V

QuiescentCurrent

IQ

VEN≥1.4V,IOUT=0mA

75

130

μA

DropoutVoltage

VDROP

IOUT=200mA,VOUT>2.8V

140

160

mV

IOUT=400mA,VOUT>2.8V

280

320

IOUT=600mA,VOUT>2.8V

420

480

LineRegulation

ΔVLINE

VIN=（VOUT+1V）to5.5V,IOUT=1mA

0.3

%

LoadRegulation

ΔLOAD

1mA

0.6

%

StandbyCurrent

ISTBY

VEN=GND,Shutdown

0.01

1

μA

ENInputBiasCurrent

IEN

VEN=1Vor5V

0.8

5.3

uA

ENThreshold

Logic-LowVoltage

VIL

VIN=3Vto5.5V,

Shutdown

0.4

V

Logic-HighVoltage

VIH

VIN=3Vto5.5V,Start-Up

1.4

VIN+

0.3

OutputNoiseVoltage

10Hzto100kHz,

IOUT=200mA,COUT=1µF

100

uVRMS

PowerSupply

f=100Hz

PSRR

COUT=1µF,

IOUT=10mA

−76

dB

RejectionRate

f=1kHz

−68

ThermalShutdownTemperature

TSD

150

°C

TypicalOperatingCharacteristics

ApplicationsInformation

Likeanylow-dropoutregulator,theexternalcapacitorsusedwiththeLP3983Hmustbecarefullyselectedforregulatorstabilityandperformance.Usingacapacitorwhosevalueis>2µFontheLP3983Hinputandtheamountofcapacitancecanbeincreasedwithoutlimit.Theinputcapacitormustbelocatedadistanceofnotmorethan0.5inchfromtheinputpinoftheICandreturnedtoacleananalogground.Thereisaspecialattentionwhichistheinputcapacitanceshouldnotbelessthanoutputcapacitance.Anygoodqualityceramicortantalumcanbeusedforthiscapacitor.ThecapacitorwithlargervalueandlowerESR（equivalentseriesresistance）providesbetterPSRRandline-transientresponse.TheoutputcapacitormustmeetbothrequirementsforminimumamountofcapacitanceandESRinallLDOsapplication.TheLP3983HisdesignedspecificallytoworkwithlowESRceramicoutputcapacitorinspace-savingandperformanceconsideration.Usingaceramiccapacitorwhosevalueisatleast1µFwithESRis>25mΩontheLP3983Houtputensuresstability.TheLP3983HstillworkswellwithoutputcapacitorofothertypesduetothewidestableESRrange.Outputcapacitoroflargercapacitancecanreducenoiseandimproveloadtransientresponse,stability,andPSRR.Theoutputcapacitorshouldbelocatednotmorethan0.5inchfromtheVOUTpinoftheLP3983Handreturnedtoacleananalogground.

Start-upFunctionEnableFunction

TheLP3983HfeaturesanLDOregulatorenable/disablefunction.ToassuretheLDOregulatorwillswitchon,theENturnoncontrollevelmustbegreaterthan1.4voltsbutnotaboveVin+0.3V.TheLDOregulatorwillgointotheshutdownmodewhenthevoltageontheENpinfallsbelow0.4volts.Forprotectingthesystem,theLP3983Hhaveaquick-dischargefunction.Iftheenablefunctionisnotneededinaspecificapplication,itmaybetiedtoVINtokeeptheLDOregulatorinacontinuouslyonstate.

FeedbackCapacitorandVoltage

Foradjustableversion,connectinga22pFbetweenoutputpinandFBpinsignificantlyreducesoutputvoltageripple,itiscriticalthatthecapacitorconnectionshouldbedirectandPCBtracesshouldbeasshortaspossible.

TheoutputvoltageofdualLDOcouldbesetbytheformulabelow:

Vout=VFB×（1+R1/R2），

whichVFB=0.8V

VOUT（V）

R2（KΩ）

R1（KΩ）

1.2

51

25.5

1.5

51

44.6

1.8

51

63.8

2

47

70.5

2.5

47

99.9

2.8

47

117.5

3

33

90.8

3.3

33

103.1

3.5

33

111.4

4

33

132.0

4.2

33

140.3

4.5

33

152.6

Consideringthepracticalapplication,wemayaddasmallcapacitorwithR1inparallelwhichcouldbe22pFor47pF.

ThermalConsiderations（forSOT23-5）

ThermalprotectionlimitspowerdissipationinLP3983H.Whentheoperationjunctiontemperatureexceeds150°C,theOTPcircuitstartsthethermalshutdownfunctionturnthepasselementoff.Thepasselementturnsonagainafterthejunctiontemperaturecoolsby30°C.Forcontinueoperation,donotexceedabsolutemaximumoperationjunctiontemperature125°C.

Thepowerdissipationdefinitionindeviceis:

PD=（VIN−VOUT）xIOUT+VINxIQ

ThemaximumpowerdissipationdependsonthethermalresistanceofICpackage,PCBlayout,therateofsurroundingsairflowandtemperaturedifferencebetweenjunctionandambient.

Themaximumpowerdissipationcanbecalculatedbyfollowingformula:

PD（MAX）=（TJ（MAX）−TA）/θJA

Where

TJ（MAX）isthemaximumoperationjunctiontemperature125°C,TAistheambienttemperatureandtheθJAisthejunctiontoambientthermalresistance.ForrecommendedoperatingconditionsspecificationofLP3983H,where

TJ（MAX）isthemaximumjunctiontemperatureofthedie（125°C）andTAisthemaximumambienttemperature.Thejunctiontoambientthermalresistance（θJAislayoutdependent）forSOT23-5packageis250°C/W.

PD（MAX）=（125°C−25°C）/250=400mW（SOT23-5）

ThemaximumpowerdissipationdependsonoperatingambienttemperatureforfixedTJ（MAX）andthermalresistanceθJA.ConsideringthePCBthermalfeather,thePD（MAX）maybehigherthan400mW.

PackagingInformation

SOT23-5

SOT89-5