ST662AB资料

ST662A

DC-DCCONVERTERFROM5VTO12V,0.03AFORFLASHMEMORYPROGRAMMINGSUPPLY

sss

ss

s

OUTPUTVOLTAGE:12V±5%

SUPPLYVOLTAGERANGE:4.5VTO5.5VGUARANTEEDOUTPUTCURRENTUPTO30mA

VERYLOWQUIESCENTCURRENT:100µALOGICCONTROLLEDELECTRONICSHUTDOWN:1µA

JUSTCAPACITORSNEEDED(NOINDUCTOR)

DIP-8

DESCRIPTION

TheST662AisaregulatedchargepumpDC-DCconverter.Itprovides12V±5%outputvoltagetoprogrambyte-wideflashmemory,andcansupply30mAoutputcurrentfrominputaslowas4.75VAlogiccontrolledshutdownpinthatinterfacesdirectlywithmicroprocessorreducesthesypplycurrenttoonly1µA

SO-8

TYPICALAPPLICATIONCIRCUIT

June19971/12

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ST662A

ABSOLUTEMAXIMUMRATINGS

SymbolVccSHDNIoPtotTopTstg

DCInputVoltagetoGNDShutdownVoltageOutputCurrentContinuousPowerDissipation

OperatingAmbientTemperatureRange(forACSERIES)

(forABSERIES)StorageTemperatureRange

Parameter

Value-0.3to6-0.3toVCC+0.3

505000to70-40to85-40to150

UnitVVmAmW

ooo

CCC

AbsoluteMaximumRatingarethosevaluesbeyondwhichdamagetothedevicemayoccur.Functionaloperationundertheseconditionisnotimplied.

CONNECTIONDIAGRAMAND(topview)

PINCONNECTIONS

PinNo12345678

SymbolC1-C1+C2-C2+VCCVOUTGNDSHDN

NameandFunction

NegativeTerminalForTheFirstChargePumpCapacitorPositiveTerminalForTheFirstChargePumpCapacitorNegativeTerminalForTheSecondChargePumpCapacitorPositiveTerminalForTheSecondChargePumpCapacitorSupplyVoltage

12VOutputVoltageVOUT=VCCWheninSshutdownModeGround

ActiveHighC-MOSlogiclevelShutdownInput.SHDNisinternallypulleduptoVCC.ConnecttoGNDforNormalOperation.InShutdownmodethechargepumpsareturnedoffandVOUT=VCC

ORDERINGNUMBERS

Type

ST662ABST662AC

ST662ABNST662ACN

DIP-8

ST662ABDST662ACD

SO-8(*)

(*)AVAILABLEINTAPEANDREELWITH”-TR”SUFFIX

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ST662A

ELECTRICALCHARACTERISTICS(Refertothetestcircuits,VCC=4.5Vto5.5VTa=TmintoTmaxunlessotherwisespecified.TypicalValuearereferredatTa=25oC)

SymbolVoVoIQ1IQ2ISHVilVihfoνRsw

Parameter

OutputVoltageOutputVoltageQuiescentCurrentShutdownCurrentShutdownPinCurrentShutdownInputLowThresholdShutdownInputHighThreshold

OscillatorFrequencyPowerEfficecy

VCC-VOUTSwitchImpedance

VCC=5V,Io=30mAVCC=5V,Io=30mA

VSHDN=VCC=5V,Io=100µA

2.4

400721

2

TestConditions

Io=0mAto20mA

Io=0mAto30mAVCC=4.75to5.5VNoLoad,VSHDN=0NoLoad,VSHDN=VCCVSHDN=0V,VCC=5VVSHDN=VCC=5V

-50Min.11.411.4

Typ.12121001-120

Max.12.612.650010-50.4

UnitVVµAµAµAµAVVKHz%KΩ

DonotoverloadorshorttheOutputtoGround.Iftheaboveconditionsareobserverd,thedevicemaybedamaged.

OutputVoltagevsTemperatureOutputVoltagevsTemperature

SupplyCurrentvsTemperatureSupplyCurrerntvsSupplyVoltage

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ST662A

SHDNPinCurrentvsTemperature

OutputVoltagevsShutdownInputVoltage

OutputVoltagevsShutdownInputVoltageOutputVoltagevsShutdownInputVoltage

TestCircuit

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ST662A

DESCRIPTION

TheST662isanICdevelopedtoprovidea12Vregulatedoutput30mAfromvoltageinputaslowas4.75withoutanyinductors.Itisusefulforawiderangeofapplicationsanditsperformancesmakesitidealforflashmemoryprogrammingsupply.

Anevaluationkitisprovidedtofacilitatetheapplication.Thisincludeasingle-sidedemoboarddesignedforsurface-mountcomponents.TheoperatingprincipleofST662(seefig.1)istochargeC1andC2capacitorbyclosingtheS1switch(whileS2isopened)attheVCCvoltage.AfterS1willbeopenedandS2closedsothatC1andC2capacitorsareplacedinseriesonetoeachother,andbothareinserieswithVin.ThesumofVC1andVC2andVinisappliedtothecapacitorC4.Thisworksasvoltagetripler.Anamplifiererrorcheckstheoutputvoltageandblockstheoscillatoriftheoutputvoltageisgreaterthan12V.

TheshutdownpinisinternallypulledtoVCC.Whenitisheldlowtheoutputvoltagerisesto+12V.Fig.2showsthetransitiontimeoftheshutdownpinwhentheVSHDNgoesfrom5Vto0V.InputlogiclevelsofthisinputareCMOScompatible.

Applyingalogichighatthisinput,theVOUToscillatorwillbeblockedandtheVOUTwillreachtheVINvaluebyD1.InthisconditionICCwillbeFigure2:ExitingShutdown

Figure1:OperatingPrincipleCircuit

lowas1µA.Thefig.3showsthetransitiontimeoftheshutdownpinwhentheVSHDNgoesfrom0Vto5V.

Figure3:EnteringShutdown

5V

0V

SHDN

0V

5VSHDN

Vout

5V

12V12V

Vout

5V

TIME=20us/DIV,VERTICAL=5V/DIV

NOTE:VCC=5V,IOUT=200µA

TIME=1ms/DIV,VERTICAL=5V/DIV

NOTE:VCC=5V,IOUT=200µA

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ST662A

APPLICATIONCIRCUIT

Basedonfastcharge/dischargeofcapacitors,thiscircuitinvolveshighdi/dtvalueslimitedonlybyRonofswitches.Thisimpliesacriticallayoutdesignduetotheneedtominimizeinductivepathsandplacecapacitorsascloseaspossibletothedevice.

Agoodlayoutdesignisstronglyrecommendedfornoisereason.Forbestperformance,useveryshortconnectionstothecapacitorsandthevaluesshownintable1.Figure4:KITLay-out

C3andC4musthavelowESRinordertominimizetheoutputripple.Theirvaluescanbereducedto2µFand1µF,respectively,whenusingceramiccapacitors,butmustbeof10µForlargerifaluminiumelectrolyticarechosen.

C5mustbeplacedasclosetothedeviceaspossibleandcouldbeomittedifverylowoutputnoiseperformancearenotrequired.

Fig4andFig5show,respectively,ourEVALUATIONkitlayoutandtherelativelyelectricalshematic.

Figure5:ElectricalSchematic

Table1:ListofComponents

CAPACITORChargePumpC1ChargePumpC2

InputC3OutputC4DecouplingC5

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TYPECeramicCeramic

ElectrolyticTantalumElectrolyticTantalum

Ceramic

VALUE(µF)

0.220.224.74.70.1

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ST662A

ST662AOUTPUTPERFORMANCEOutputVoltagevsOutputCurrent

EfficencyvsOutputCurrent

LoadTransientResponseLineTransientResponse

Iout20mA/div

SHDN

Vin1V/div

5.5V4.5V

Vout

Vout100mV/div

Vout200mV/div

TIME=1ms/DIV

NOTE:VCC=5V,IOUT=0to30mA

TIME=1ms/DIV

NOTE:VCC=4.5to5.5V,IOUT=30mA

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ST662A

HOWTOINCREASEOUTPUTCURRENTOROUTPUTVOLTAGECAPABILITY

CurrentcapabilityislimitedbyRonofinternalswitches.ItispossibletoincreaseitconnectinginparalleltwoormoreST662Adevices;eachoneofthemcansupply30mA.Thefigure6showstheelectricschematic.ThecapacitorsC3,C4andC5mustbeplacedveryclosetotheICsontheboard.Ifthisisnotpossible,youcanplacetwo

differentcapacitors,eachofthemofhalfvalue,veryclosetotherespectiveintegratedcircuit.Fig.8showtheOutputCurrentcapabilityoftheproposedcircuit.

Ifanoutputvoltagegreaterthan12Visrequired,it’spossibletorealizethecircuitofthefollowingdiagram(figure7).TherelevantOutputCurrentcapabilityisshowninfigure9inwhichisshowntheoutputvoltagevsloadcurrent.

Figure6:ApplicationCircuitforTwoST662AinParallel

Table2:ListofComponents

CAPACITOR

C1AC2AC1BC2BC3C4C5

TYPECeramicCeramicCeramicCeramic

ElectrolyticTantalumElectrolyticTantalum

Ceramic

VALUE(µF)

0.220.220.220.2210100.22

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ST662A

Figure7:ApplicationCircuitforOutputVoltagegreaterthan12V

Figure8:OutputVoltagefortheApplicationwithTwoDeviceinParallelFigure9:OutputVoltageforApplicationwithOutputVoltagegreaterthan12V

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ST662A

PlasticDIP-8MECHANICALDATA

DIM.

MIN.

Aa1BB1bb1DEee3e4FILZ

0.44

3.3

1.6

0.017

8.82.7.627.62

7.14.8

0.130

0.063

0.380.71.390.91

0.5

0.59.8

0.3460.1000.3000.300

0.2800.1

0.015

1.651.04

mmTYP.3.3

0.0280.0550.036

0.020

0.0200.3860.0650.041

MAX.

MIN.

inchTYP.0.130

MAX.

P001F

10/12

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ST662A

SO-8MECHANICALDATA

DIM.

MIN.

Aa1a2a3bb1Cc1DEee3FLMS

3.80.44.85.8

1.273.81

4.01.270.6

8(max.)

0.140.015

5.06.2

0.650.350.190.250.1

mmTYP.

MAX.1.750.251.650.850.480.250.5

45(typ.)

0.1880.228

0.0500.150

0.1570.0500.0230.1960.244

0.0250.0130.0070.0100.003MIN.

inchTYP.

MAX.0.0680.0090.00.0330.0180.0100.019

0016023

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ST662A

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