LMC7660 Switched Capacitor Voltage Converter datasheet ...

1 APRIL1997 REVISEDAPRIL2013 LMC7660 SwitchedCapacitorVoltageConverterCheckfo rSamples:LMC76601 FEATURESDESCRIPTIONTheLMC7660is a CMOS voltageconvertercapable2 OperationOverFullTemperatureandVoltageof convertinga positivevoltageintherangeof+ +10 Vtothecorrespondingnegativevoltageof LowSupplyCurrent,200 A Max :operationoverfulltemperature , 97%VoltageConversionEfficiencylowquiesce ntcurrent,andhighpowerefficiency. 95%PowerConversionEfficiencyTheLMC7660us esitsbuilt-inoscillatortoswitch4 EasytoUse,Only2 ExternalComponentspowerMOSswitchesandcha rgetwoinexpensive ,standardwarranty,andusein 1997 2013, APRIL1997 (1)(2) (V++ )forV+< ,7(3)(V+ )to(V++ )forV+> (3)20 AOutputShortCircuitDuration(V+ )ContinuousPowerDissipation(4) (4)150 C JA(4)PDIPP ackage90 C/WSOICP ackage160 65 C T 150 CLeadTemperature(Soldering,5 sec.)260 CESDT olerance(5) 2000V(1) (1)underElectricalCharacteristicsforcond itions.

2 (2)If Military/Aerospacespecifieddevicesarereq uired,pleasecontacttheTexasInstrumentsSa lesOffice/Distributorsforavailabilityand specifications.(3)Connectinganyinputterm inaltovoltagesgreaterthanV+ is recommendedthatnoinputsfromsourcesoperat ingfromexternalsuppliesbeappliedpriorto power-up oftheLMC7660.(4)Foroperationatelevatedte mperature,thesedevicesmustbederatedbased ona thermalresistanceof jaandTjmax,Tj= TA+ jaPD.(5)Thetestcircuitconsistsofthehuman bodymodelof100pFin serieswith1500 .ELECTRICALCHARACTERISTICS(1)LMC7660IN/U nitsLMC7660 IMSymbolParameterConditionsTypLimitsLimi t(2)IsSupplyCurrentRL= 120200 A400maxV+HSupplyVoltageRL= 10k , Pin6 Open3 to103 to10 VRangeHigh(3)VoltageEfficiency 90%3 to10V+LSupplyVoltageRL= 10k , Pin6 90% (1) 25 C,V+= 5V,Cosc= 0, shownin Figure1 .(2)Limitsatroomtemperaturearespecifieda nd100% (butnot100%tested),andarenotusedtocalcul ateoutgoingqualitylevels.

3 (3) , 1997 2013, APRIL1997 REVISEDAPRIL2013 ELECTRICALCHARACTERISTICS(1)(continued)L MC7660IN/UnitsLMC7660 IMSymbolParameterConditionsTypLimitsLimi t(2)RoutOutputSourceIL= 20mA55100 Resistance120maxV = 2V,IL= 3 mA110200 Pin6 5 k 9795%90minVo effVoltageConversionRL= = +3 1997 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback3 ProductFolderLinks: LMC7660 LMC7660 SNOSBZ9C APRIL1997 @V+= PowerEfficiencyIout@V+= 5 VvsLoadCurrent(V+= 2V) PowerEfficiencyOutputSourceResistianceas avsLoadCurrent(V+= 5V) 1997 2013, APRIL1997 REVISEDAPRIL2013 TYPICALPERFORMANCECHARACTERISTICS(contin ued)OutputRUnloadedOscillatorFrequencyvs asa @V+= 1997 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback5 ProductFolderLinks: LMC7660 LMC7660 SNOSBZ9C APRIL1997 a sequencetoprovidesupplyinversionVout= Vin. V+fromV+. WhenswitchesS1andS3areclosed,Cpchargesto thesupplyvoltageV+.

4 Duringthistimeinterval, +, S1andS3areopened, ,Cpdevelopsa Voltage V+/2onCr. AfteranumberofcyclesCrwillbepumpedtoexac tly V+. ThistransferwillbeexactassumingnoloadonC r, andnolossin , S1isa P-channeldeviceandS2,S3, biasedbelowground,it is importantthatthep substratelogiccircuitspecifiesthatthesep wellmustbeatthelowestpotentialin ,a leveltranslatorgeneratesVGS4= 0V,andthisis accomplishedbybiasingtheleveltranslatorf romtheS4p 2 += theLVpinis shortedtogroundforV+ + , is theoreticallypossibletoapproach100%effic iencyif and2 largepumpcapacitorCp, thechargeremovedwhilesupplyingthereservo ircapacitorissmallcomparedtoCp' thepumpcapacitorvoltage, :(1)Byusinga largereservoircapacitor, ,if theloadcurrentis 5 mAandtheacceptedrippleis 200mV,thenthereservoircapacitorcanomitap proximatelybecalculatedfrom:(2) (LVterminal) +. ,previous7660designsrequirea diodein ,it , 1997 2013, APRIL1997 nominal10kHztoseveralhundredhertz,byaddi ngaslow-downcapacitorCosc(Figure12).

5 AsshownintheTypicalPerformanceCurvesthes upplycurrentcanbeloweredtothe10 A mustbeunderstoodthattheloweroperatingfre quencyandsupplycurrentcauseanincreasedim pedanceofCrandCp. Theincreasedimpedance,duetoa lowerswitchingrate, is 2 circuitin the7660,sothepumpingfrequencywillbe 1997 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback7 ProductFolderLinks: LMC7660 LMC7660 SNOSBZ9C APRIL1997 ' 'sownpumpingcapacitorCp, butthereservoircapacitorCris sharedasdepictedin Figure14. Thecompositeoutputresistanceis:(3)INCREA SINGOUTPUTVOLTAGES tackingtheLMC7660sis aneasywaytoproducea shouldbenotedthattheinputcurrentrequired foreachstageis twicetheloadcurrentonthatstageasshownin Figure15. Theeffectiveoutputresistanceis approximatelythesumoftheindividualRoutva lues,andsoonlya ispossibletogenerate 15 Vfrom+5 Vbyconnectingthesecond7660'spin8 to+5 VinsteadofgroundasshowninFigure16.

6 Notethatthesecond7660seesa full20 Vandtheinputsupplyshouldnotbeincreasedbe yond+ 15 Vfrom+5V8 SubmitDocumentationFeedbackCopyright 1997 2013, APRIL1997 REVISEDAPRIL2013 SPLITV+ precisionvoltagedivider(forverylightload s),alternatelyit is usedtogeneratea cyclewhenS1andS3areclosed,thesupplyvolta gedividesacrossthecapacitorsina cyclewhenS2andS4areclosed,thecapacitorss witchfroma seriesconnectiontoa ;thechargeredistributestomaintainprecise lyV+/2,acrossCpandCr. InthisapplicationalldevicesareonlyV+/2, ,shownin Figure18, cycleS2chargesCp1 throughD1;D2is cycleS2is openandS1is is chargedtoV+ VD1andis referencedtoV+throughS1,thejunctionofD1a ndD2is atV++ (V+ VD1). D1is performinga negativeconversionatthesametimeasshownin Figure19. Inthe cyclethatD1is chargingCp1,Cp2 is connectedfromgroundto VoutviaS2andS4,andCr2 is storingCp2' ,Cp1 pumpsthejunctionofD1andD2aboveV+, whileCp2 is refreshedfromV+.

7 + 1997 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback9 ProductFolderLinks: LMC7660 LMC7660 SNOSBZ9C APRIL1997 CUsingthecombinednegativeandpositivemult iplierofFigure20withanLM35it is possibletomakea Powerthermometerthatspansa 180 C C,whiledrawingonly50 ,a pulldowntoa negativevoltageis thermometercircuitformeasuringtemperatur esfrom 55 Cto+125 ' VOUTIt ispossibletoregulatetheoutputoftheLMC766 0andstillmaintain a loopwitha 5 VforIL= 10mA,andVin= > 7V,theoutputstaysin regulationuptoIL= oftheLP2951setslowwhentheregulatedoutput atpin4 dropsbyabout5%.TheLP2951canbeshutdownbyt akingpin3high;theLMC7660canbeshutdownbys hortingpin7 ,whichmeanstheLMC7660cangivearegulatedou tputfrom 10 VdependentontheresistorratiosR1andR2,ass howninFigure22, Vref= :(4)*Forlowervoltageoperation,useSchottk yrectifiersFigure20. PowerThermometerSpans180 C,andPullsOnly150 5 Vwith200 A StandbyCurrent10 SubmitDocumentationFeedbackCopyright 1997 2013, APRIL1997 REVISEDAPRIL2013 Vref= * NegativeAdjustableRegulatorCopyright 1997 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback11 ProductFolderLinks: LMC7660 LMC7660 SNOSBZ9C APRIL1997 (April2013)toRevisionCPage 1997 2013,TexasInstrumentsIncorporatedProduct FolderLinks.

8 LMC7660 PACKAGE OPTION 1 PACKAGING INFORMATIONO rderable DeviceStatus(1)Package TypePackageDrawingPinsPackageQtyEco Plan(2)Lead finish/Ball material(6)MSL Peak Temp(3)Op Temp ( C)Device Marking(4/5)SamplesLMC7660 IMNRNDSOICD895 Non-RoHS& GreenCall TICall TILMC7660 IMLMC7660IM/NOPBACTIVESOICD895 RoHS & GreenSNLevel-1-260C-UNLIM-40 to 85 LMC7660 IMLMC7660 IMXNRNDSOICD82500 Non-RoHS& GreenCall TICall TILMC7660 IMLMC7660 IMX/NOPBACTIVESOICD82500 RoHS & GreenSNLevel-1-260C-UNLIM-40 to 85 LMC7660 IMLMC7660IN/NOPBACTIVEPDIPP840 RoHS & GreenSNLevel-1-NA-UNLIM-40 to 85 LMC7660IN (1) The marketing status values are defined as follows:ACTIVE: Product device recommended for new : TI has announced that the device will be discontinued, and a lifetime-buy period is in : Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new : Device has been announced but is not in production.

9 Samples may or may not be : TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substancedo not exceed by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI mayreference these types of products as "Pb-Free".RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS : TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide basedflame retardants must also meet the <=1000ppm threshold requirement.

10 (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuationof the previous line and the two combined represent the entire Device Marking for that device. (6) Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to twolines if the finish value exceeds the maximum column OPTION 2 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.