Product Sample & Technical Tools & Support & Folder Buy Documents Software Community LM2750,LM2750-ADJ SNVS180N–APRIL2002–REVISEDAPRIL2016 LM2750 Low-Noise Switched-Capacitor Boost Regulator 1 Features 3 Description • WideInputVoltageRange:2.7Vto5.6V The LM2750 is a regulated switched-capacitor 1 doublerthatproducesalow-noiseoutputvoltage.The • InductorlessSolution:ApplicationRequiresOnly 5-Voutputvoltageoption(LM2750-5.0)cansupplyup ThreeSmallCeramicCapacitors to 120 mA of output current over a 2.9-V to 5.6-V • Fixed5-VOutputandAdjustableOutputVoltage input range, as well as up to 40 mA of output current OptionsAvailable when the input voltage is as low as 2.7 V. An adjustable output voltage option with similar output • 85%PeakEfficiency current capabilities is also available (LM2750-ADJ). – 70%AverageEfficiencyOverLi-IonInput The LM2750 has been placed in TI's 10-pin WSON, a Range(2.9Vto4.2V) package with excellent thermal properties that keeps • OutputCurrentupto120mAWith2.9V ≤ V ≤ the part from overheating under almost all rated IN 5.6V operatingconditions. – OutputCurrentupto40mAWith2.7V ≤ V ≤ A perfect fit for space-constrained, battery-powered IN 2.9V applications, the LM2750 requires only three external • Fixed1.7-MHzSwitchingFrequencyforaLow- components: one input capacitor, one output capacitor, and one flying capacitor. Small, Noise,Low-RippleOutputSignal inexpensive ceramic capacitors are recommended for • Pre-RegulationMinimizesInputCurrentRipple, use.Inconjunctionwiththe KeepingtheBatteryLine 1.7-MHz fixed switching frequency of the LM2750, (VIN)VirtuallyNoise-Free thesecapacitorsyieldlowoutput-voltageripple,which • ShutdownSupplyCurrentLessThan2µA is beneficial for systems requiring a low-noise supply. Pre-regulation minimizes input current ripple, thus • TinyWSONPackageWithOutstandingPower reducinginputnoisetonegligiblelevels. Dissipation:UsuallyNoDeratingRequired A tightly controlled soft-start feature limits inrush 2 Applications currents during part activation. Shutdown completely disconnects the load from the input. Output current • WhiteandColoredLED-BasedDisplayLighting limiting and thermal shutdown circuitry protect both • CellularPhoneSIMCards theLM2750andotherconnecteddevicesintheevent • AudioAmplifierPowerSupplies ofoutputshortsorexcessivecurrentloads. • GeneralPurposeLi-Ion-to-5-VConversion DeviceInformation(1) • EPOSBarcodeScanners PARTNUMBER PACKAGE BODYSIZE(NOM) • IndustrialHandheldRadios LM2750 WSON(10) 3.00mm×3.00mm LM2750-ADJ (1) For all available packages, see the orderable addendum at theendofthedatasheet. TypicalApplicationCircuit IOUT up to 120 mA, (VIN t 2.9 V) IOUT up to 40 mA, (VIN t 2.7 V) VIN 8, 9 VIN VOUT 1, 2 V5 OVU T± 4% 2.7 V to 5.6 V C2.I2N PF LM2750-5.0 2C.2O UPTF 4 CAP+ 10 SD CFLY 1 PF CAP- 7 GND 3, 5, 6, DAP Capacitors: 1 PF - TDK C1608X5R1A105K 2.2 PF - TDK C2012X7R1A225K Copyright © 2016, Texas Instruments Incorporated 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LM2750,LM2750-ADJ SNVS180N–APRIL2002–REVISEDAPRIL2016 www.ti.com Table of Contents 1 Features.................................................................. 1 7.4 DeviceFunctionalModes........................................12 2 Applications........................................................... 1 8 ApplicationandImplementation........................ 13 3 Description............................................................. 1 8.1 ApplicationInformation............................................13 4 RevisionHistory..................................................... 2 8.2 TypicalApplications ...............................................14 5 PinConfigurationandFunctions......................... 3 9 PowerSupplyRecommendations...................... 19 9.1 LEDDriverPowerConsumption.............................19 6 Specifications......................................................... 4 10 Layout................................................................... 20 6.1 AbsoluteMaximumRatings......................................4 6.2 ESDRatings..............................................................4 10.1 LayoutRecommendations....................................20 6.3 RecommendedOperatingConditions.......................4 10.2 LayoutExample....................................................20 6.4 ThermalInformation..................................................5 11 DeviceandDocumentationSupport................. 21 6.5 ElectricalCharacteristics...........................................5 11.1 DeviceSupport ....................................................21 6.6 SwitchingCharacteristics..........................................6 11.2 DocumentationSupport........................................21 6.7 TypicalCharacteristics..............................................7 11.3 CommunityResources..........................................21 7 DetailedDescription.............................................. 9 11.4 Trademarks...........................................................21 7.1 Overview...................................................................9 11.5 ElectrostaticDischargeCaution............................21 7.2 FunctionalBlockDiagram.........................................9 11.6 Glossary................................................................21 7.3 FeatureDescription...................................................9 12 Mechanical,Packaging,andOrderable Information........................................................... 22 4 Revision History NOTE:Pagenumbersforpreviousrevisionsmaydifferfrompagenumbersinthecurrentversion. ChangesfromRevisionM(June2015)toRevisionN Page • Added2additional"Applications" .......................................................................................................................................... 1 • AddedadditionalThermalInformation;changedR forDSCfrom58.7°C/Wto45.6°C/WandforNGYfrom θJA 32.7°C/Wto62.4°C/W............................................................................................................................................................ 5 ChangesfromRevisionL(May2013)toRevisionM Page • AddedDeviceInformationandPinConfigurationandFunctionssections,ESDRatingtable,FeatureDescription, DeviceFunctionalModes,ApplicationandImplementation,PowerSupplyRecommendations,Layout,Deviceand DocumentationSupport,andMechanical,Packaging,andOrderableInformationsections;addedalready-released LM2750-ADJpartnumbertotitle............................................................................................................................................ 1 ChangesfromRevisionK(May2013)toRevisionL Page • ChangedlayoutofNationalDataSheettoTIformat........................................................................................................... 19 2 SubmitDocumentationFeedback Copyright©2002–2016,TexasInstrumentsIncorporated ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ www.ti.com SNVS180N–APRIL2002–REVISEDAPRIL2016 5 Pin Configuration and Functions NGYorDSCPackage 10-PinWSON VOUT 1 10 C+ C+ 10 1 VOUT VOUT 2 Die-Attach 9 VIN VIN 9 2 VOUT Die-Attach Pad (DAP) GND/FB* 3 8 VIN VIN 8 Pad (DAP) 3 GND/FB* GND SD 4 7 C- C- 7 GND 4 SD GND 5 6 GND GND 6 5 GND Top View Bottom View * LM2750-5.0: Pin 3 = GND; LM2750-ADJ: Pin 3 = FB PinNamesandNumbersapplytobothNGY0010AandDSC0010Apackages. PinFunctions PIN TYPE DESCRIPTION NAME LM2750-5.0 LM2750-ADJ CAP+ 10 10 P Flyingcapacitorpositiveterminal CAP– 7 7 P Flyingcapacitornegativeterminal FB — 3 P Feedbackpin — Thispinmustbeconnectedexternallytothegroundpins(pins5,6,andthe GND 3 G DAP). GND 5,6 5,6 G Ground-Thesepinsmustbeconnectedexternally. Active-lowshutdowninput.A200-kΩresistorisconnectedinternallybetweenthis SD 4 4 I/O pinandGNDtopullthevoltageonthispinto0V,andshutthepartdown,when thepinisleftfloating. VIN 8,9 8,9 P Inputvoltage-Thepinsmustbeconnectedexternally. VOUT 1,2 1,2 P Outputvoltage-Thesepinsmustbeconnectedexternally. TheDAP(ExposedPad)functionsasathermalconnectionwhensolderedtoa DAP √ √ GND copperplane. Copyright©2002–2016,TexasInstrumentsIncorporated SubmitDocumentationFeedback 3 ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ SNVS180N–APRIL2002–REVISEDAPRIL2016 www.ti.com 6 Specifications 6.1 Absolute Maximum Ratings overoperatingfree-airtemperaturerange(unlessotherwisenoted)(1)(2) MIN MAX UNIT VINpin:VoltagetoGND –0.3 6 V SDpin:VoltagetoGND –0.3 (V +0.3) V IN Junctiontemperature,T 150 °C J-MAX-ABS Continuouspowerdissipation(3) Internallylimited Maximumoutputcurrent(4) 175 mA Maximumleadtemperature(soldering,5seconds) 260 °C Storagetemperature,T –65 150 °C stg (1) StressesbeyondthoselistedunderAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.Thesearestressratings only,whichdonotimplyfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderRecommended OperatingConditions.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability. (2) IfMilitary/Aerospacespecifieddevicesarerequired,contacttheTISalesOffice/Distributorsforavailabilityandspecifications. (3) Thermalshutdowncircuitryprotectsthedevicefrompermanentdamage.ThermalshutdownengagesatT =150°C(typical)and J disengagesatT =135°C(typical). J (4) Absolutemaximumoutputcurrentspecifiedbydesign.Recommendedinputvoltagerangeforoutputcurrentsinexcessof120mA: 3.1Vto4.4V. 6.2 ESD Ratings VALUE UNIT Human-bodymodel(HBM),perANSI/ESDA/JEDECJS-001(1) ±2000 V Electrostaticdischarge V (ESD) Machinemodel ±100 (1) JEDECdocumentJEP155statesthat500-VHBMallowssafemanufacturingwithastandardESDcontrolprocess. 6.3 Recommended Operating Conditions overoperatingfree-airtemperaturerange(unlessotherwisenoted)(1)(2) MIN MAX UNIT LM2750-5.0inputvoltage 2.7 5.6 V 3.8V≤V ≤4.9V 2.7 (V +0.7) V OUT OUT LM2750-ADJinputvoltage 4.9V≤V ≤5.2V 2.7 5.6 V OUT LM2750-ADJoutputvoltage 3.8 5.2 V 2.9V≤V ≤5.6V 0 120 mA IN Recommendedoutputcurrent 2.7V≤V ≤2.9V 0 40 mA IN Junctiontemperature,T –40 125 °C J Ambienttemperature,T (3) –40 85 °C A (1) StressesbeyondthoselistedunderAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.Thesearestressratings only,whichdonotimplyfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderRecommended OperatingConditions.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.For performancelimitsandassociatedtestconditions,seeElectricalCharacteristics. (2) AllvoltagesarewithrespecttothepotentialattheGNDpin. (3) Maximumambienttemperature(T )isdependentonthemaximumoperatingjunctiontemperature(T =125°C),the A-MAX J-MAX-OP maximumpowerdissipationofthedeviceintheapplication(P ),andthejunction-toambientthermalresistanceofthepart/package D-MAX intheapplication(R ),asgivenbythisequation:T =T –(R ×P ).Formoreinformationonthesetopics,seeAN- θJA A-MAX J-MAX-OP θJA D-MAX 1187LeadlessLeadframePackage(LLP)(SNOA401)andPowerEfficiencyAndPowerDissipation. 4 SubmitDocumentationFeedback Copyright©2002–2016,TexasInstrumentsIncorporated ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ www.ti.com SNVS180N–APRIL2002–REVISEDAPRIL2016 6.4 Thermal Information LM2750-5.0,LM2750-ADJ THERMALMETRIC(1) NGY(WSON) DSC(WSON) UNIT 10PINS 10PINS R Junction-to-ambientthermalresistance 62.4 45.6 °C/W θJA R Junction-to-case(top)thermalresistance 60.2 46.2 °C/W θJC(top) R Junction-to-boardthermalresistance 36.1 21.5 °C/W θJB ψ Junction-to-topcharacterizationparameter 1.2 0.7 °C/W JT ψ Junction-to-boardcharacterizationparameter 36.2 21.8 °C/W JB R Junction-to-case(bottom)thermalresistance 5.7 6.5 °C/W θJC(bot) (1) Formoreinformationabouttraditionalandnewthermalmetrics,seetheSemiconductorandICPackageThermalMetricsapplication report,SPRA953. 6.5 Electrical Characteristics TypicalvaluesapplyforT =25°C;minimumandmaximumlimitsapplyovertheoperatingjunctiontemperaturerange; J 2.9V≤V ≤5.6V,V =5V(LM2750-ADJ),V =V ,C =1µF,C =2×1µF,C =2×1µF,unlessotherwise IN OUT (SD) IN FLY IN OUT specified (1)(2)(3). PARAMETER TESTCONDITIONS MIN TYP MAX UNIT 2.9V≤V ≤5.6V, IN 4.8(–4%) 5 5.2(4%) Outputvoltage IOUT≤120mA V V OUT (LM2750-5.0) 2.7V≤V ≤2.9V, IN 4.8(–4%) 5 5.2(4%) I ≤40mA,T =25°C OUT J I =0mA,T =25°C OUT J 5 10 V ≤V ≤V IH(MIN) (SD) IN I Operatingsupplycurrent mA Q I =0mA, OUT 12 V ≤V ≤V IH(MIN) (SD) IN I Shutdownsupplycurrent V =0V 2 µA SD (SD) Feedbackpinvoltage V V =3.1V 1.17 1.232 1.294 V FB (LM2750-ADJ) IN Feedbackpininputcurrent I V =1.4V 1 nA FB (LM2750-ADJ) FB C =10µF,I =100mA 4 OUT OUT V Outputripple mVp-p R C =2.2µF,I =100mA 15 OUT OUT Peakefficiency VIN=2.7V,IOUT=40mA 87% E PEAK (LM2750-5.0) V =2.9V,I =120mA 85% IN OUT AverageEfficiencyoverLi-Ion V =2.9Vto4.2V,I =120mA 70% IN OUT E InputRange AVG (LM2750-5.0) (4) VIN=2.9Vto4.2V,IOUT=40mA 67% ƒ Switchingfrequency 1 1.7 MHz SW I Currentlimit V shortedtoGND 300 mA LIM OUT (1) AllvoltagesarewithrespecttothepotentialattheGNDpin. (2) Minimumandmaximumlimitsarespecifiedbydesign,test,orstatisticalanalysis.Typicalnumbersrepresentthemostlikelynorm. (3) C ,C ,andC :Low-ESRSurface-MountCeramicCapacitors(MLCCs)usedinsettingelectricalcharacteristics FLY IN OUT (4) EfficiencyismeasuredversusV ,withV beingsweptinsmallincrementsfrom3Vto4.2V.Theaverageiscalculatedfromthese IN IN measurementsresults.Weightingtoaccountforbatteryvoltagedischargecharacteristics(V vs.time)isnotdoneincomputingthe BAT average. Copyright©2002–2016,TexasInstrumentsIncorporated SubmitDocumentationFeedback 5 ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ SNVS180N–APRIL2002–REVISEDAPRIL2016 www.ti.com Electrical Characteristics (continued) TypicalvaluesapplyforT =25°C;minimumandmaximumlimitsapplyovertheoperatingjunctiontemperaturerange; J 2.9V≤V ≤5.6V,V =5V(LM2750-ADJ),V =V ,C =1µF,C =2×1µF,C =2×1µF,unlessotherwise IN OUT (SD) IN FLY IN OUT specified(1)(2)(3). PARAMETER TESTCONDITIONS MIN TYP MAX UNIT SHUTDOWNPIN(SD)CHARACTERISTICS V Logic-highSDinput 1.3 V V IH IN V Logic-lowSDinput 0 0.4 V IL I SDinputcurrent(5) 1.3V≤V ≤V 15 50 µA IH (SD) IN I SDinputcurrent V =0V –1 1 µA IL (SD) CAPACITORCHARACTERISTICS I ≤60mA 1 C Requiredinputcapacitance(6) OUT µF IN 60mA≤I ≤120mA 2 OUT I ≤60mA 1 C Requiredoutputcapacitance(6) OUT µF OUT 60mA≤I ≤120mA 2 OUT (5) SDInputCurrent(I )isduetoa200-kΩ(typical)pulldownresistorconnectedinternallybetweentheSDpinandGND. IH (6) Limitistheminimumrequiredoutputcapacitancetoensureproperoperation.Thiselectricalspecificationisspecifiedbydesign. 6.6 Switching Characteristics overoperatingfree-airtemperaturerange(unlessotherwisenoted) PARAMETER TESTCONDITIONS MIN TYP MAX UNIT t V turnontime V =3V,I =100mA(1) 0.5 ms ON OUT IN OUT (1) TurnontimeismeasuredfromwhenSDsignalispulledhighuntiltheoutputvoltagecrosses90%ofitsfinalvalue. 6 SubmitDocumentationFeedback Copyright©2002–2016,TexasInstrumentsIncorporated ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ www.ti.com SNVS180N–APRIL2002–REVISEDAPRIL2016 6.7 Typical Characteristics Unlessotherwisespecified:V =3.6V,T =25°C,C =2.2µF,C =1µF,C =2.2µF.Capacitorsarelow-ESRmulti- IN A IN FLY OUT layerceramiccapacitors(MLCCs). Figure1.OutputVoltagevs.OutputCurrent Figure2.OutputVoltagevs.OutputCurrent Figure3.OutputVoltagevs.InputVoltage Figure4.InputCurrentvs.OutputCurrent Figure5.QuiescentSupplyCurrent Figure6.CurrentLimitBehavior Copyright©2002–2016,TexasInstrumentsIncorporated SubmitDocumentationFeedback 7 ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ SNVS180N–APRIL2002–REVISEDAPRIL2016 www.ti.com Typical Characteristics (continued) Unlessotherwisespecified:V =3.6V,T =25°C,C =2.2µF,C =1µF,C =2.2µF.Capacitorsarelow-ESRmulti- IN A IN FLY OUT layerceramiccapacitors(MLCCs). Figure7.SwitchingFrequency Figure8.OutputVoltageRipple I =120mA OUT Figure9.OutputVoltageRipple Figure10.TurnonBehavior 8 SubmitDocumentationFeedback Copyright©2002–2016,TexasInstrumentsIncorporated ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ www.ti.com SNVS180N–APRIL2002–REVISEDAPRIL2016 7 Detailed Description 7.1 Overview The LM2750 is a regulated switched capacitor doubler that, by combining the principles of switched-capacitor voltage boost and linear regulation, generates a regulated output from an extended Li-Ion input voltage range. A two-phase non-overlapping clock generated internally controls the operation of the doubler. During the charge phase (φ1), the flying capacitor (C ) is connected between the input and ground through internal pass- FLY transistorswitchesandischargedtotheinputvoltage.Inthepumpphasethatfollows(φ2),theflyingcapacitoris connectedbetweentheinputandoutputthroughsimilarswitches.Stackedatoptheinput,thechargeoftheflying capacitorbooststheoutputvoltageandsuppliestheloadcurrent. A traditional switched capacitor doubler operating in this manner uses switches with very low on-resistance to generate an output voltage that is 2× the input voltage. The LM2750 regulates the output voltage by controlling theresistanceofthetwoinput-connectedpass-transistorswitchesinthedoubler. 7.2 Functional Block Diagram C- C+ LM2750 S1 S3 S2 S4 I1 I2 I1 I2 VOUT OCL OCL = Overcurrent Limit Ra* R1** VIN FB** 1.7-MHz Oscillator Rb* R2** SD Soft- 1.2-V start Reference GND * LM2750-5.0 only ** LM2750-ADJ only Copyright © 2016, Texas Instruments Incorporated 7.3 Feature Description 7.3.1 Pre-Regulation The very low input current ripple of the LM2750, which results from internal pre-regulation, adds very little noise to the input line. The core of the LM2750 is very similar to that of a basic switched capacitor doubler: it is composed of four switches and a flying capacitor (external). Regulation is achieved by modulating the on- resistance of the two switches connected to the input pin (one switch in each phase). The regulation is done before the voltage doubling, giving rise to the term pre-regulation. It is pre-regulation that eliminates most of the inputcurrentripplethatisatypicalandundesirablecharacteristicofamanyswitchedcapacitorconverters. Copyright©2002–2016,TexasInstrumentsIncorporated SubmitDocumentationFeedback 9 ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ SNVS180N–APRIL2002–REVISEDAPRIL2016 www.ti.com Feature Description (continued) 7.3.2 Input,Output,andGroundConnections Making good input, output, and ground connections is essential to achieve optimal LM2750 performance. The two input pads, pads 8 and 9, must be connected externally. It is strongly recommended that the input capacitor (C ) be placed as close to the LM2750 device as possible, so that the traces from the input pads are as short IN and straight as possible. To minimize the effect of input noise on LM2750 performance, it is best to bring two traces out from the LM2750 all the way to the input capacitor pad, so that they are connected at the capacitor pad. Connecting the two input traces between the input capacitor and the LM2750 input pads could make the LM2750moresusceptibletonoise-relatedperformancedegradation.TIalsorecommendsthattheinputcapacitor be on the same side of the PCB as the LM2750, and that traces remain on this side of the board as well (vias to tracesonotherPCBlayersarenotrecommendedbetweentheinputcapacitorandLM2750inputpads). The two output pads, pads 1 and 2, must also be connected externally. TI recommends that the output capacitor (C ) be placed as close to the LM2750 output pads as possible. It is best if routing of output pad traces follow OUT guidelines similar to those presented for the input pads and capacitor. The flying capacitor (C ) must also be FLY placed as close to the LM2750 device as possible to minimize PCB trace length between the capacitor and the device.Duetothepad-layoutofthepart,itislikelythatthetracefromoneoftheflyingcapacitorpads(C+orC–) must be routed to an internal or opposite-side layer using vias. This is acceptable, and it is much more advantageoustorouteaflyingcapacitortraceinthisfashionthanitistoplaceinputtracesonotherlayers. The GND pads of the LM2750 are ground connections and must be connected externally. These include pads 3 (LM2750-5.0 only), 5, 6, and the die-attach pad (DAP). Large, low-impedance copper fills and via connections to an internal ground plane are the preferred way of connecting together the ground pads of the LM2750, the input capacitor,andtheoutputcapacitor,aswellasconnectingthiscircuitgroundtothesystemgroundofthePCB. 7.3.3 Shutdown When the voltage on the active-low-logic shutdown pin is low, the LM2750 is in shutdown mode. In shutdown, the LM2750 draws virtually no supply current. There is a 200-kΩ pulldown resistor tied between the SD pin and GND that pulls the SD pin voltage low if the pin is not driven by a voltage source. When pulling the part out of shutdown, the voltage source connected to the SD pin must be able to drive the current required by the 200-kΩ resistor. For voltage management purposes required upon start-up, internal switches connect the output of the LM2750 to an internal pulldown resistor (1 kΩ typical) when the part is shut down. Driving the output of the LM2750byanothersupplywhentheLM2750isshutdownisnotrecommended,asthepulldownresistorwasnot sizedtosinkcontinuouscurrent. 7.3.4 SoftStart The LM2750 employs soft-start circuitry to prevent excessive input inrush currents during start-up. The output voltage is programmed to rise from 0 V to the nominal output voltage (5 V) in 500 µs (typical). Soft start is engaged when a part, with input voltage established, is taken out of shutdown mode by pulling the SD pin voltagehigh.Softstartalsoengageswhenvoltageisestablishedsimultaneouslytotheinputand SDpins. 7.3.5 OutputCurrentCapability The LM2750-5.0 provides 120 mA of output current when the input voltage is within 2.9 V to 5.6 V. Using the LM2750todriveloadsinexcessof120mAispossible. NOTE Understanding relevant application issues is recommended and a thorough analysis of the application circuit must be performed when using the part outside operating ratings and/or specifications to ensure satisfactory circuit performance in the application. Special care must be paid to power dissipation and thermal effects. These parameters can have a dramatic impact on high-current applications, especially when the input voltage is high. (seePowerEfficiencyAndPowerDissipation). 10 SubmitDocumentationFeedback Copyright©2002–2016,TexasInstrumentsIncorporated ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ www.ti.com SNVS180N–APRIL2002–REVISEDAPRIL2016 Feature Description (continued) The schematic of Figure 11 is a simplified model of the LM2750 that is useful for evaluating output current capability. The model shows a linear pre-regulation block (Reg), a voltage doubler (2×), and an output resistance (R ). Output resistance models the output voltage droop that is inherent to switched capacitor converters. The OUT output resistance of the LM2750 is 5 Ω (typical), and is approximately equal to twice the resistance of the four LM2750 switches. When the output voltage is in regulation, the regulator in the model controls the voltage V' to keep the output voltage equal to 5 V ± 4%. With increased output current, the voltage drop across R OUT increases.Topreventdroopinoutputvoltage,thevoltagedropacrosstheregulatorisreduced,V'increases,and V remains at 5V. When the output current increases to the point that there is zero voltage drop across the OUT regulator, V' equals the input voltage, and the output voltage is "on the edge" of regulation. Additional output current causes the output voltage to fall out of regulation, and the LM2750 operation is similar to a basic open- loop doubler. As in a voltage doubler, increase in output current results in output voltage drop proportional to the outputresistanceofthedoubler.Theout-of-regulationLM2750outputvoltagecanbeapproximatedby: 8176=2(cid:215)8+0F +176 (cid:215) 4176 (1) Again, Equation 1 only applies at low input voltage and high output current where the LM2750 is not regulating. SeeFigure1andFigure2informoredetails. VIN Reg V ' 2× 2×V ' VOUT ROUT Copyright © 2016, Texas Instruments Incorporated Figure11. LM2750OutputResistanceModel A more complete calculation of output resistance takes into account the effects of switching frequency, flying capacitance,andcapacitorequivalentseriesresistance(ESR).SeeEquation2: 1 4176 = 2 (cid:215)459+( (cid:215) % +4 (cid:215) ’54%(.;+ ’54%176 59 (.; (2) Switch resistance (5 Ω typical) dominates the output resistance equation of the LM2750. With a 1.7-MHz typical switching frequency, the 1/(F×C) component of the output resistance contributes only 0.6 Ω to the total output resistance. Increasing the flying capacitance only provides minimal improvement to the total output current capability of the LM2750. In some applications it may be desirable to reduce the value of the flying capacitor below 1 µF to reduce solution size and/or cost, but this must be done with care so that output resistance does not increase to the point that undesired output voltage droop results. If ceramic capacitors are used, equivalent series resistance (ESR) is a negligible factor in the total output resistance, as the ESR of quality ceramic capacitorsistypicallymuchlessthan100mΩ. 7.3.6 ThermalShutdown The LM2750 implements a thermal shutdown mechanism to protect the device from damage due to overheating. When the junction temperature rises to 150°C (typical), the part switches into shutdown mode. The LM2750 releasesthermalshutdownwhenthejunctiontemperatureofthepartisreducedto130°C(typical). Thermal shutdown is most-often triggered by self-heating, which occurs when there is excessive power dissipation in the device and/or insufficient thermal dissipation. LM2750 power dissipation increases with increased output current and input voltage (see Power Efficiency And Power Dissipation). When self-heating brings on thermal shutdown, thermal cycling is the typical result. Thermal cycling is the repeating process where thepartself-heats,entersthermalshutdown(whereinternalpowerdissipationispracticallyzero),cools,turnson, and then heats up again to the thermal shutdown threshold. Thermal cycling is recognized by a pulsing output voltage and can be stopped be reducing the internal power dissipation (reduce input voltage and/or output current) or the ambient temperature. If thermal cycling occurs under desired operating conditions, thermal dissipation performance must be improved to accommodate the power dissipation of the LM2750. The WSON package has excellent thermal properties that, when soldered to a PCB designed to aid thermal dissipation, allowstheLM2750tooperateunderverydemandingpowerdissipationconditions. Copyright©2002–2016,TexasInstrumentsIncorporated SubmitDocumentationFeedback 11 ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ SNVS180N–APRIL2002–REVISEDAPRIL2016 www.ti.com Feature Description (continued) 7.3.7 OutputCurrentLimiting The LM2750 contains current limit circuitry that protects the device in the event of excessive output current and/or output shorts to ground. Current is limited to 300 mA (typical) when the output is shorted directly to ground. When the LM2750 is current limiting, power dissipation in the device is likely to be quite high. In this event,thermalcyclingmustbeexpected(seeThermalShutdown). 7.3.8 ProgrammingtheOutputVoltageoftheLM2750-ADJ As shown in Figure 12, the output voltage of the LM2750-ADJ can be programmed with a simple resistor divider (see resistors R1 and R2). The values of the feedback resistors set the output voltage, as determined by Equation3: V =1.23V×(1+R1/R2) (3) OUT In Equation 3, 1.23 V is the nominal voltage of the feedback pin when the feedback loop is correctly established, and the device is operating normally. The sum of the resistance of the two feedback resistors must be from 15 kΩto20kΩ:15kΩ <(R1+ R2)<20kΩ. Iflargerfeedbackresistorsaredesired,a10-pFcapacitormustbeplacedinparallelwithresistorR1. 7.4 Device Functional Modes 7.4.1 PWMBrightness/DimmingControl Brightness of the LEDs can be adjusted in an application by driving the SD pin of the LM2750 with a PWM signal. When the PWM signal is high, the LM2750 is ON, and current flows through the LEDs, as described in the previous section. A low PWM signal turns the part and the LEDs OFF. The perceived brightness of the LEDs is proportional to ON current of the LEDs and the duty cycle (D) of the PWM signal (the percentage of time the LEDsareON). To achieve good brightness/dimming control with this circuit, proper selection of the PWM frequency is required. The PWM frequency (ƒ ) must be set higher than 100 Hz to avoid visible flickering of the LED light. An upper PWM bound on this frequency is also needed to accommodate the turn-on time of the LM2750 (T = 0.5 ms typical). ON This maximum recommended PWM frequency is similarly dependent on the minimum duty cycle (D ) of the MIN application.ThenextequationputsboundsontherecommendedPWMfrequencyrange: 100Hz<F <D ÷T (4) PWM MIN ON Choosing a PWM frequency within these limits results in fairly linear control of the time-averaged LED current over the full duty-cycle adjustment range. For most applications, a PWM frequency from 100 Hz to 500 Hz is recommended.APWMfrequencyupto1kHzmaybeacceptableinsomedesigns. 12 SubmitDocumentationFeedback Copyright©2002–2016,TexasInstrumentsIncorporated ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ www.ti.com SNVS180N–APRIL2002–REVISEDAPRIL2016 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers must validateandtesttheirdesignimplementationtoconfirmsystemfunctionality. 8.1 Application Information 8.1.1 OutputVoltageRipple The amount of voltage ripple on the output of the LM2750 is highly dependent on the application conditions: output current and the output capacitor, specifically. A simple approximation of output ripple is determined by calculating the amount of voltage droop that occurs when the output of the LM2750 is not being driven. This occurs during the charge phase (φ1). During this time, the load is driven solely by the charge on the output capacitor. The magnitude of the ripple thus follows the basic discharge equation for a capacitor (I = C × dV/dt), wheredischargetimeisone-halftheswitchingperiod,or0.5/F .Putsimply, SW + 0.5 4+22.’2A=GF2A=G = %176 (cid:215) ( 176 59 (5) A more thorough and accurate examination of factors that affect ripple requires including effects of phase non- overlap times and output capacitor equivalent series resistance (ESR). In order for the LM2750 to operate properly, the two phases of operation must never coincide. (If this were to happen all switches would be closed simultaneously, shorting input, output, and ground). Thus, non-overlap time is built into the clocks that control the phases. Because the output is not being driven during the non-overlap time, this time must be accounted for in calculatingripple.Actualoutputcapacitordischargetimeisapproximately60%ofaswitchingperiod,or0.6/F . SW The ESR of the output capacitor also contributes to the output voltage ripple, as there is effectively an AC voltage drop across the ESR due to current switching in and out of the capacitor. Equation 6 is a more complete calculation of output ripple than presented previously, taking into account phase non-overlap time and capacitor ESR. 4+22.’2A=GF2A=G = %+176 (cid:215) (0.6 +(2 (cid:215) +176 (cid:215) ’54%176) 176 59 (6) A low-ESR ceramic capacitor is recommended on the output to keep output voltage ripple low. Placing multiple capacitors in parallel can reduce ripple significantly, both by increasing capacitance and reducing ESR. When capacitors are in parallel, ESR is in parallel as well. The effective net ESR is determined according to the properties of parallel resistance. Two identical capacitors in parallel have twice the capacitance and half the ESR as compared to a single capacitor of the same make. On a similar note, if a large-value, high-ESR capacitor (tantalum, for example) is to be used as the primary output capacitor, the net output ESR can be significantly reducedbyplacingalow-ESRceramiccapacitorinparallelwiththisprimaryoutputcapacitor. Copyright©2002–2016,TexasInstrumentsIncorporated SubmitDocumentationFeedback 13 ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ SNVS180N–APRIL2002–REVISEDAPRIL2016 www.ti.com 8.2 Typical Applications 8.2.1 LM2750-ADJTypicalApplication VOUT = 1.23 V × (1 + R1/R2) 2.7 V to 5.6V VIN 8, 9 1, 2 VIOOUUTT u Rpa ton g1e2: 03 .m8A V to 5.2 V VIN VOUT CIN COUT 2.2 PF LM2750-ADJ 2.2 PF For VOUT < 4.9 V: max VIN= VOUT + 0.7 V R1 10 CAP+ 3 FB CFLY 4 1 PF CAP- SD R2 7 GND 5, 6, DAP Capacitors: 1 PF - TDK C1608X5R1A105K 2.2 PF - TDK C2012X7R1A225K Copyright © 2016, Texas Instruments Incorporated Figure12. LM2750-ADJTypicalApplicationCircuit 8.2.1.1 DesignRequirements ExamplerequirementsforLM2750-ADJ: DESIGNPARAMETER EXAMPLEVALUE Inputvoltagerange 2.7Vto5.6V Outputcurrent,2.9V≤5.6V upto120mA Outputcurrent,2.7V≤2.9V upto40mA Switchingfrequency 1.7MHz 8.2.1.2 DetailedDesignProcedure 8.2.1.2.1 Capacitors The LM2750 requires three external capacitors for proper operation. Surface-mount multi-layer ceramic capacitors are recommended. These capacitors are small, inexpensive and have very low equivalent series resistance (≤ 10 mΩ typical). Tantalum capacitors, OS-CON capacitors, and aluminum electrolytic capacitors generally are not recommended for use with the LM2750 due to their high ESR, as compared to ceramic capacitors. For most applications, ceramic capacitors with X7R or X5R temperature characteristic are preferred for use with the LM2750. These capacitors have tight capacitance tolerance (as good as ±10%), hold their value over temperature(X7R:±15%over –55°Cto+125°C;X5R: ±15%over–55°Cto =85°C), and typically have little voltage coefficient. Capacitors with Y5V and/or Z5U temperature characteristic are generally not recommended. These types of capacitors typically have wide capacitance tolerance ( 80%, –20%), vary significantly over temperature (Y5V: 22%, –82% over –30°C to +85°C range; Z5U: 22%, –56% over 10°C to 85°C range), and have poor voltage coefficients. Under some conditions, a nominal 1-µF Y5V or Z5U capacitor could have a capacitance of only 0.1 µF. Such detrimental deviation is likely to cause these Y5V and Z5UofcapacitorstofailtomeettheminimumcapacitancerequirementsoftheLM2750. 14 SubmitDocumentationFeedback Copyright©2002–2016,TexasInstrumentsIncorporated ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ www.ti.com SNVS180N–APRIL2002–REVISEDAPRIL2016 Table1listssomeleadingceramiccapacitormanufacturers. Table1.SuggestedCapacitors MANUFACTURER CONTACTINFORMATION TDK www.component.tdk.com AVX www.avx.com Murata www.murata.com Taiyo-Yuden www.t-yuden.com Vishay-Vitramon www.vishay.com 8.2.1.2.2 InputCapacitor The input capacitor (C ) is used as a reservoir of charge, helping to quickly transfer charge to the flying IN capacitor during the charge phase (φ1) of operation. The input capacitor helps to keep the input voltage from drooping at the start of the charge phase, when the flying capacitor is first connected to the input, and helps to filter noise on the input pin that could adversely affect sensitive internal analog circuitry biased off the input line. As mentioned above, an X7R/X5R ceramic capacitor is recommended for use. For applications where the maximum load current required is from 60 mA to 120 mA, a minimum input capacitance of 2 µF is required. For applications where the maximum load current is 60 mA or less, 1 µF of input capacitance is sufficient. Failure to provide enough capacitance on the LM2750 input can result in poor part performance, often consisting of output voltagedroop,excessiveoutputvoltagerippleand/orexcessiveinputvoltageripple. A minimum voltage rating of 10 V is recommended for the input capacitor. This is to account for DC bias properties of ceramic capacitors. Capacitance of ceramic capacitors reduces with increased DC bias. This degradationcanbequitesignificant(>50%)whentheDCbiasapproachesthevoltageratingofthecapacitor. 8.2.1.2.3 FlyingCapacitor The flying capacitor (C ) transfers charge from the input to the output, providing the voltage boost of the FLY doubler. A polarized capacitor (tantalum, aluminum electrolytic, etc.) must not be used here, as the capacitor is reverse-biased upon start-up of the LM2750. The size of the flying capacitor and its ESR affect output current capability when the input voltage of the LM2750 is low, most notable for input voltages below 3 V. These issues were discussed previously in Output Current Capability. For most applications, a 1-µF X7R/X5R ceramic capacitorisrecommendedfortheflyingcapacitor. 8.2.1.2.4 OutputCapacitor TheoutputcapacitoroftheLM2750playsanimportantpartindeterminingthecharacteristicsoftheoutputsignal of the LM2750, many of which have already been discussed. The ESR of the output capacitor affects charge pump output resistance, which plays a role in determining output current capability. Both output capacitance and ESR affect output voltage ripple. For these reasons, a low-ESR X7R/X5R ceramic capacitor is the capacitor of choicefortheLM2750output. In addition to these issues previously discussed, the output capacitor of the LM2750 also affects control-loop stability of the part. Instability typically results in the switching frequency effectively reducing by a factor of two, giving excessive output voltage droop and/or increased voltage ripple on the output and the input. With output currents of 60 mA or less, a minimum capacitance of 1 µF is required at the output to ensure stability. For output currentsfrom60mAto120mA,aminimumoutputcapacitanceof2 µFisrequired. A minimum voltage rating of 10 V is recommended for the output capacitor. This is to account for DC bias properties of ceramic capacitors. Capacitance of ceramic capacitors reduces with increased DC bias. This degradationcanbequitesignificant(>50%)whentheDCbiasapproachesthevoltageratingofthecapacitor. Copyright©2002–2016,TexasInstrumentsIncorporated SubmitDocumentationFeedback 15 ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ SNVS180N–APRIL2002–REVISEDAPRIL2016 www.ti.com 8.2.1.2.5 PowerEfficiencyAndPowerDissipation Efficiency of the LM2750 mirrors that of an unregulated switched capacitor converter followed by a linear regulator. The simplified power model of the LM2750, in Figure 13, is used to discuss power efficiency and power dissipation. In calculating power efficiency, output power (P ) is easily determined as the product of the OUT output current and the 5-V output voltage. Like output current, input voltage is an application-dependent variable. Theinputcurrentcanbecalculatedusingtheprinciplesoflinearregulationandswitchedcapacitorconversion.In an ideal linear regulator, the current into the circuit is equal to the current out of the circuit. The principles of powerconservationmandatetheidealinputcurrentofavoltagedoublermustbetwicetheoutputcurrent.Adding a correction factor for operating quiescent current (I , 5-mA typical) gives an approximation for total input current Q which,whencombinedwiththeotherinputandoutputparameter(s),yieldsEquation7forefficiency: 2 8 (cid:215) + ’= 176 (cid:215) 176 176 2+0 8+0 (cid:215)(2 (cid:215) +176 + +3) (7) Comparisons of LM2750 efficiency measurements to calculations using Equation 7 have shown a quite accurate approximation of actual efficiency. Because efficiency is inversely proportional to input voltage, it is highest when the input voltage is low. In fact, for an input voltage of 2.9 V, efficiency of the LM2750 is greater than 80% (I ≥ 40 mA) and peak efficiency is 85% (I = 120 mA). The average efficiency for an input voltage range OUT OUT spanning the Li-Ion range (2.9 V to 4.2 V) is 70% (I = 120 mA). At higher input voltages, efficiency drops OUT dramatically. In Li-Ion-powered applications, this is typically not a major concern, as the circuit is powered off by a charger in these circumstances. Low efficiency equates to high power dissipation, however, which could becomeanissueworthyofattention. TheLM2750powerdissipation(P )iscalculatedsimplybysubtractingoutputpowerfrominputpower: D 2&=2+0F 2176= [8+0(cid:215)(2 (cid:215) +176+ +3)] F [8176(cid:215) +176] (8) Power dissipation increases with increased input voltage and output current, up to 772 mW at the ends of the operating ratings (V = 5.6 V, I = 120 mA). Internal power dissipation self-heats the device. Dissipating this IN OUT amount power/heat so the LM2750 does not overheat is a demanding thermal requirement for a small surface- mount package. When soldered to a PCB with layout conducive to power dissipation, the excellent thermal properties of the WSON package enable this power to be dissipated from the LM2750 with little or no derating, evenwhenthecircuitisplacedinelevatedambienttemperatures. VIN SCwapitcahceitodr- V ' # 2 × VIN IdReeagl uLlianteoar r VOUT = 5 V IIN = (2 × IOUT) + IQ Doubler I ' = IOUT (IQ = 0) IOUT IQ Copyright © 2016, Texas Instruments Incorporated Figure13. LM2750ModelforPowerEfficiencyandPowerDissipationCalculations 8.2.1.3 ApplicationCurve Figure14.PowerEfficiency 16 SubmitDocumentationFeedback Copyright©2002–2016,TexasInstrumentsIncorporated ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ www.ti.com SNVS180N–APRIL2002–REVISEDAPRIL2016 8.2.2 LM2750LEDDriveApplications IOUT up to 120 mA, (VIN t 2.9 V) VIN VOUT = 5 V ± 4% IOUT up to 40 mA, (VIN t 2.7 V) 2.7 V to 5.6 V 8, 9 1, 2 LED1 ... LED6 VIN VOUT 2.C2 INPF LM2750-5.0 2C.2O UPTF 10 4 CAP+ SD CFLY 1 PF CAP- 7 R1 ... R6 GND Capacitors: ILEDx = (5 V - VLEDx) ÷ Rx 1 PF - TDK C1608X5R1A105K 3, 5, 6, DAP 2.2PF - TDK C2012X7R1A225K Copyright © 2016, Texas Instruments Incorporated Figure15. LM2750-5.0LEDDriveApplicationCircuit VIN VVOOUUTT =R a1n.2g3e :V 3 +.8 V VL EtDo1 5.2 V IOUT up to 120 mA 2.7 V to 5.6 V 8, 9 1, 2 LED1 ... LED6 VIN VOUT CIN COUT 2.2 PF LM2750-ADJ 2.2 PF For VOUT < 4.9 V: max VIN= VOUT + 0.7 V 10 CAP+ 3 FB CFLY 4 1 PF CAP- SD 7 GND 5, 6, DAP Capacitors: 1 PF - TDK C1608X5R1A105K R1 ... R6 2.2PF - TDK C2012X7R1A225K ILED1 = 1.23 V ÷ R1 ILEDx = (1.23 V + VLED1 - VLEDx) ÷ Rx Copyright © 2016, Texas Instruments Incorporated Figure16. LM2750-ADJLEDDriveApplicationCircuit 8.2.2.1 DesignRequirements SeeDesignRequirements. Copyright©2002–2016,TexasInstrumentsIncorporated SubmitDocumentationFeedback 17 ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ SNVS180N–APRIL2002–REVISEDAPRIL2016 www.ti.com 8.2.2.2 DetailedDesignRequirements The LM2750 is an excellent device for driving white and blue LEDs for display backlighting and other general- purpose lighting functions. The circuits of Figure 15 and Figure 16 show LED driver circuits for the LM2750-5.0 andtheLM2750-ADJ,respectively.Simplyplacingaresistor(R)inserieswitheachLEDsetsthecurrentthrough theLEDs: +.’& =(8176F8.’&)(cid:247)4 (9) In Equation 9, I is the current that flows through a particular LED, and V is the forward voltage of the LED LED LED at the given current. As can be seen in Equation 9 above, LED current varies with changes in LED forward voltage(V ).MismatchofLEDcurrentsresultsinbrightnessmismatchfromoneLEDtothenext. LED The feedback pin of the LM2750-ADJ can be utilized to help better control brightness levels and negate the effectsofLEDforwardvoltagevariation.AsshowninFigure16,connectingthefeedbackpintotheprimaryLED- resistor junction (LED1-R1) regulates the current through that LED. The voltage across the primary resistor (R1) is the feedback pin voltage (1.23 V typical), and the current through the LED is the current through that resistor. CurrentthroughallotherLEDs(LEDx)isnotregulated,however,andvarieswithLEDforwardvoltagevariations. When using the LM2750-ADJ in current-mode, LED currents can be calculated with Equation 10 and Equation11: +.’&1 =1.23 8(cid:247)41 (10) +.’&T =(1.23 8+8.’&1F8.’&T)(cid:247)4T (11) The current-mode configuration does not improve brightness matching from one LED to another in a single circuit, but keeps currents similar from one circuit to the next. For example: if there is forward voltage mismatch from LED1 to LED2 on a single board, the current-mode LM2750-ADJ solution provides no benefit. But if the forward voltage of LED1 on one board is different than the forward voltage of LED1 on another board, the currents through LED1 in both phones will match. This helps keep LED currents fairly consistent from one producttothenext,andhelpstooffsetlot-to-lotvariationofLEDforwardvoltagecharacteristics. 8.2.2.2.1 LEDDriverPowerEfficiency Efficiency of an LED driver (E ) is typically defined as the power consumed by the LEDs (P ) divided by the LED LED power consumed at the input of the circuit. Input power consumption of the LM2750 was explained and defined in the previous section titled: . Assuming LED forward voltages and currents match reasonably well, LED power consumptionistheproductofthenumberofLEDsinthecircuit(N),theLEDforwardvoltage(V ),andtheLED LED forwardcurrent(I ): LED 2.’&=0 (cid:215)8.’&(cid:215)+.’& (12) ’.’& = 2.’&(cid:247)2+0 =:0(cid:215) 8.’& (cid:215) +.’&;(cid:247){8+0 (cid:215)>(2 (cid:215)+176;+5 I#]} (13) 8.2.2.3 ApplicationCurve Figure17isanefficiencycurveforatypicalLM2750LED-driveapplication. Figure17.LM2750LEDDriveEfficiency,6LEDs I =20mAeach,V =4V LED LED 18 SubmitDocumentationFeedback Copyright©2002–2016,TexasInstrumentsIncorporated ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ www.ti.com SNVS180N–APRIL2002–REVISEDAPRIL2016 9 Power Supply Recommendations TheLM2750isdesignedtooperatefromaninputvoltagesupplyrangefrom2.7Vto5.6V.Thisinputsupply mustbewellregulatedandcapabletosupplytherequiredinputcurrent.Iftheinputsupplyislocatedfarfromthe device,additionalbulkcapacitancemayberequiredinadditiontotheceramicbypasscapacitors. 9.1 LED Driver Power Consumption For battery-powered LED-drive applications, TI strongly recommends that power consumption, rather than power efficiency, be used as the metric of choice when evaluating power conversion performance. Power consumed (P )issimplytheproductofinputvoltage(V )andinputcurrent(I ): IN IN IN P =V ×I (14) IN IN IN TheLM2750inputcurrentisequaltotwicetheoutputcurrent(I ),plusthesupplycurrentofthepart(nominally OUT 5mA): I =(2×I )+5mA (15) IN OUT Output voltage and LED voltage do not impact the amount of current consumed by the LM2750 circuit. Thus, neither factor affects the current draw on a battery. Because output voltage does not impact input current, there is no power savings with either the LM2750-5.0 or the LM2750-ADJ; both options consume the same amount of power. InLEDDriverPowerEfficiency,LEDDriverEfficiencywasdefinedinEquation13. Equation13canbesimplifiedbyrecognizing • 2× I >5mA(highoutput-currentapplications); OUT • N×I =I LED OUT Thus,simplificationyields:E =V /V . LED LED IN This is in direct contrast to the previous assertion that showed that power consumption was completely independent of LED voltage. As is the case here with the LM2750, efficiency is often not a good measure of power conversion effectiveness of LED driver topologies. This is why it is strongly recommended that power consumptionbestudiedormeasuredwhencomparingthepowerconversioneffectivenessofLEDdrivers. Additionally,efficiencyofanLEDdrivesolutionmustnotbeconfusedwithanefficiencycalculationforastandard powerconverter(E ). P ’2 = 2176 (cid:247)2+0 =:8176 (cid:215) +176;(cid:247)(8+0 (cid:215)++0) (16) Equation 16 neglects power losses in the external resistors that set LED currents and is a very poor metric of LED-drivepowerconversionperformance. Copyright©2002–2016,TexasInstrumentsIncorporated SubmitDocumentationFeedback 19 ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ SNVS180N–APRIL2002–REVISEDAPRIL2016 www.ti.com 10 Layout 10.1 Layout Recommendations A good board layout of the LM2750 circuit is required to achieve optimal assembly, electrical, and thermal dissipation performance. Figure 18 is an example of a board layout implementing recommended techniques. For more information related to layout for the WSON/SON package, see AN-1187 Leadless Leadframe Package (LLP)(SNOA401). Generalguidelinesforboardlayoutare: • Place capacitors as close to the LM2750 device as possible and on the same side of the board. V and V IN OUT connectionsaremostcritical:runshorttracesfromtheLM2750padsdirectlytothesecapacitorpads. • Connect the ground pins of the LM2750 and the capacitors to a good ground plane. The ground plane is essentialforbothelectricalandthermaldissipationperformance. • For optimal thermal performance, make the ground plane(s) as large as possible. Connect the die-attach pad (DAP) of the LM2750 to the ground plane(s) with wide traces and/or multiple vias. Top-layer ground planes are most effective in increasing the thermal dissipation capability of the WSON package. Large internal groundplanesarealsoveryeffectiveinkeepingthedietemperatureoftheLM2750withinoperatingratings. 10.2 Layout Example Figure18. LM2750-5.0RecommendedLayout 20 SubmitDocumentationFeedback Copyright©2002–2016,TexasInstrumentsIncorporated ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ www.ti.com SNVS180N–APRIL2002–REVISEDAPRIL2016 11 Device and Documentation Support 11.1 Device Support 11.1.1 Third-PartyProductsDisclaimer TI'S PUBLICATION OF INFORMATION REGARDING THIRD-PARTY PRODUCTS OR SERVICES DOES NOT CONSTITUTE AN ENDORSEMENT REGARDING THE SUITABILITY OF SUCH PRODUCTS OR SERVICES OR A WARRANTY, REPRESENTATION OR ENDORSEMENT OF SUCH PRODUCTS OR SERVICES, EITHER ALONEORINCOMBINATIONWITHANYTIPRODUCTORSERVICE. 11.2 Documentation Support 11.2.1 RelatedDocumentation Forrelateddocumentationseethefollowing: TexasInstrumentsAN-1187 LeadlessLeadframePackage(LLP)(SNOA401). 11.2.2 RelatedLinks Table 2 lists quick access links. Categories include technical documents, support and community resources, toolsandsoftware,andquickaccesstosampleorbuy. Table2.RelatedLinks TECHNICAL TOOLS& SUPPORT& PARTS PRODUCTFOLDER SAMPLE&BUY DOCUMENTS SOFTWARE COMMUNITY LM2750 Clickhere Clickhere Clickhere Clickhere Clickhere LM2750-ADJ Clickhere Clickhere Clickhere Clickhere Clickhere 11.3 Community Resources The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use. TIE2E™OnlineCommunity TI'sEngineer-to-Engineer(E2E)Community.Createdtofostercollaboration amongengineers.Ate2e.ti.com,youcanaskquestions,shareknowledge,exploreideasandhelp solveproblemswithfellowengineers. DesignSupport TI'sDesignSupport QuicklyfindhelpfulE2Eforumsalongwithdesignsupporttoolsand contactinformationfortechnicalsupport. 11.4 Trademarks E2EisatrademarkofTexasInstruments. Allothertrademarksarethepropertyoftheirrespectiveowners. 11.5 Electrostatic Discharge Caution Thesedeviceshavelimitedbuilt-inESDprotection.Theleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoam duringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates. 11.6 Glossary SLYZ022—TIGlossary. Thisglossarylistsandexplainsterms,acronyms,anddefinitions. Copyright©2002–2016,TexasInstrumentsIncorporated SubmitDocumentationFeedback 21 ProductFolderLinks:LM2750 LM2750-ADJ

LM2750,LM2750-ADJ SNVS180N–APRIL2002–REVISEDAPRIL2016 www.ti.com 12 Mechanical, Packaging, and Orderable Information The following pages include mechanical, packaging, and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of thisdocument.Forbrowser-basedversionsofthisdatasheet,refertotheleft-handnavigation. 22 SubmitDocumentationFeedback Copyright©2002–2016,TexasInstrumentsIncorporated ProductFolderLinks:LM2750 LM2750-ADJ

PACKAGE OPTION ADDENDUM www.ti.com 6-Feb-2020 PACKAGING INFORMATION Orderable Device Status Package Type Package Pins Package Eco Plan Lead/Ball Finish MSL Peak Temp Op Temp (°C) Device Marking Samples (1) Drawing Qty (2) (6) (3) (4/5) LM2750LD-5.0/NOPB ACTIVE WSON NGY 10 1000 Green (RoHS SN Level-3-260C-168 HR -40 to 85 S002B & no Sb/Br) LM2750LD-ADJ/NOPB ACTIVE WSON NGY 10 1000 Green (RoHS SN Level-3-260C-168 HR -40 to 85 S003B & no Sb/Br) LM2750LDX-5.0/NOPB ACTIVE WSON NGY 10 4500 Green (RoHS SN Level-3-260C-168 HR -40 to 85 S002B & no Sb/Br) LM2750SD-5.0/NOPB ACTIVE WSON DSC 10 1000 Green (RoHS SN Level-1-260C-UNLIM -40 to 85 S005B & no Sb/Br) LM2750SD-ADJ/NOPB ACTIVE WSON DSC 10 1000 Green (RoHS SN Level-1-260C-UNLIM -40 to 85 S004B & no Sb/Br) LM2750SDX-5.0/NOPB ACTIVE WSON DSC 10 4500 Green (RoHS SN Level-1-260C-UNLIM S005B & no Sb/Br) LM2750SDX-ADJ/NOPB ACTIVE WSON DSC 10 4500 Green (RoHS SN Level-1-260C-UNLIM -40 to 85 S004B & no Sb/Br) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: 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 substance do not exceed 0.1% 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 may reference 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 exemption. Green: 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 based flame retardants must also meet the <=1000ppm threshold requirement. (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 continuation of the previous line and the two combined represent the entire Device Marking for that device. Addendum-Page 1

PACKAGE OPTION ADDENDUM www.ti.com 6-Feb-2020 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. Addendum-Page 2

PACKAGE MATERIALS INFORMATION www.ti.com 20-Sep-2016 TAPE AND REEL INFORMATION *Alldimensionsarenominal Device Package Package Pins SPQ Reel Reel A0 B0 K0 P1 W Pin1 Type Drawing Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant (mm) W1(mm) LM2750LD-5.0/NOPB WSON NGY 10 1000 178.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM2750LD-ADJ/NOPB WSON NGY 10 1000 178.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM2750LDX-5.0/NOPB WSON NGY 10 4500 330.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM2750SD-5.0/NOPB WSON DSC 10 1000 178.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM2750SD-ADJ/NOPB WSON DSC 10 1000 178.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM2750SDX-5.0/NOPB WSON DSC 10 4500 330.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM2750SDX-ADJ/NOPB WSON DSC 10 4500 330.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 PackMaterials-Page1

PACKAGE MATERIALS INFORMATION www.ti.com 20-Sep-2016 *Alldimensionsarenominal Device PackageType PackageDrawing Pins SPQ Length(mm) Width(mm) Height(mm) LM2750LD-5.0/NOPB WSON NGY 10 1000 210.0 185.0 35.0 LM2750LD-ADJ/NOPB WSON NGY 10 1000 210.0 185.0 35.0 LM2750LDX-5.0/NOPB WSON NGY 10 4500 367.0 367.0 35.0 LM2750SD-5.0/NOPB WSON DSC 10 1000 210.0 185.0 35.0 LM2750SD-ADJ/NOPB WSON DSC 10 1000 210.0 185.0 35.0 LM2750SDX-5.0/NOPB WSON DSC 10 4500 367.0 367.0 35.0 LM2750SDX-ADJ/NOPB WSON DSC 10 4500 367.0 367.0 35.0 PackMaterials-Page2

MECHANICAL DATA NGY0010A LDA10A (Rev B) www.ti.com

MECHANICAL DATA DSC0010A SDA10A (Rev A) www.ti.com

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