TLV61220 TI1 | Alldatasheet
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L1 4.7/c58H VBAT VOUT FB C2
10 F/c58
0.7V to VOUT 1.8V to 5.5V TLV61220 www.ti.com SLVSB53 –MAY 2012 LOW INPUTVOLTAGESTEP-UPCONVERTERINTHINSOT-23PACKAGE Check forSamples: TLV61220 1FEATURES APPLICATIONS
- Up to95% EfficiencyatTypicalOperating • BatteryPowered Applications Conditions – 1 to3 CellAlkaline,NiCd or NiMH
- 5.5μA QuiescentCurrent – 1 CellLi-Ionor Li-Primary
- StartupIntoLoad at0.7V InputVoltage • Solaror FuelCellPowered Applications
- OperatingInputVoltagefrom 0.7V to5.5V • Consumer and PortableMedicalProducts
- Pass-Through FunctionduringShutdown • PersonalCare Products
- Minimum SwitchingCurrent200 mA • White or StatusLEDs
- Protections: • Smartphones – Output Overvoltage – Overtemperature – InputUndervoltageLockout
- AdjustableOutput Voltagefrom 1.8V to5.5V
- Small 6-pinThin SOT-23 Package
DESCRIPTION
The TLV61220 providesa power-supplysolutionforproductspowered by eithera single-cell,two-cell,orthree- cellalkaline,NiCd or NiMH, or one-cellLi-Ionor Li-polymerbattery.Possibleoutputcurrentsdepend on the input-to-outputvoltageratio.The boostconverterisbased on a hystereticcontrollertopologyusingsynchronous rectificationto obtainmaximum efficiencyat minimalquiescentcurrents.The outputvoltageof the adjustable versioncan be programmed by an externalresistordivider,or issetinternallyto a fixedoutputvoltage.The convertercan be switchedoffby a featuredenablepin.Whilebeingswitchedoff,batterydrainisminimized.The deviceispackaged ina 6-pinthinSOT-23 package (DBV). spacer Pleasebe aware thatan importantnoticeconcerningavailability,standardwarranty,and use incriticalapplicationsof Texas Instrumentssemiconductorproductsand disclaimerstheretoappearsattheend ofthisdatasheet. PRODUCTION DATA informationiscurrentas ofpublicationdate. Copyright© 2012,Texas InstrumentsIncorporatedProductsconform to specificationsper the terms of the Texas Instrumentsstandardwarranty.Productionprocessingdoes not necessarilyincludetestingofallparameters.
SLVSB53 –MAY 2012 www.ti.com These deviceshave limitedbuilt-inESD protection.The leadsshouldbe shortedtogetherorthedeviceplacedinconductivefoam duringstorageorhandlingtopreventelectrostaticdamage totheMOS gates. AVAILABLE DEVICE OPTIONS OUTPUT VOLTAGETA PACKAGE PART NUMBERDC/DC –40°C to85°C Adjustable 6-PinSOT-23 TLV61220DBV ABSOLUTE MAXIMUM RATINGS overoperatingfree-airtemperaturerange(unlessotherwisenoted)(1) MIN MAX UNIT VIN Inputvoltagerangeon VBAT, SW, VOUT, EN, FB – 0.3to 7.5 V TJ Operatingjunctiontemperaturerange –40 150 °C Tstg Storagetemperaturerange –65 150 °C Human Body Model (HBM) (2) 2 kV ESD Charged DeviceModel (CDM) (2) 1.5 kV (1) Stressesbeyond thoselistedunderAbsoluteMaximum Ratingsmay cause permanentdamage tothedevice.These arestressratings only,and functionaloperationofthedeviceattheseorany otherconditionsbeyond thoseindicatedunderRecommended Operating Conditionsisnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmay affectdevicereliability. (2) ESD testingisperformedaccordingtotherespectiveJESD22 JEDEC standard. DISSIPATION RATINGS TABLE THERMAL THERMAL THERMAL DERATING FACTORPOWER RATINGPACKAGE RESISTANCE RESISTANCE RESISTANCE ABOVETA ≤ 25°CΘJA (1) ΘJB ΘJC TA = 25°C DBV 130 °C/W 27 °C/W 41 °C/W 769 mW 7.7mW/ °C (1) Thermalratingsaredeterminedassuminga highK PCB designaccordingtoJEDEC standardJESD51-7. RECOMMENDED OPERATING CONDITIONS MIN NOM MAX UNIT VIN SupplyvoltageatVIN 0.7 5.5 V TA Operatingfreeairtemperaturerange –40 85 °C TJ Operatingvirtualjunctiontemperaturerange –40 125 °C
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ELECTRICAL CHARACTERISTICS
overrecommended free-airtemperaturerangeand overrecommended inputvoltagerange(typicalatan ambienttemperature rangeof25°C) (unlessotherwisenoted) DC/DC STAGE PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VIN Inputvoltagerange 0.7 5.5 V VIN Minimum inputvoltageatstartup R Load ≥ 150 Ω 0.7 V VOUT TLV61220 outputvoltagerange VIN < VOUT 1.8 5.5 V VFB TLV61220 feedbackvoltage 483 500 513 mV ILH Inductorcurrentripple 200 mA VOUT = 3.3V,VIN = 1.2V,TA = 25 °C 220 400 mA ISW switchcurrentlimit VOUT = 3.3V,TA = -40°C to85 °C 180 400 mA VOUT = 3.3V,TA = 0°C to85 °C 200 400 mA VOUT = 3.3V 1000 m ΩRectifyingswitchon resistance, HSD VOUT = 5 V 700 m Ω R DS(on) VOUT = 3.3V 600 m Ω Main switchon resistance,LSD VOUT = 5 V 550 m Ω Lineregulation VIN < VOUT 0.5% Load regulation VIN < VOUT 0.5% ShutdownISD VIN VEN = 0 V,VIN = 1.2V,VOUT ≥ VIN 0.2 0.5 μAcurrent Leakage currentintoVOUT VEN = 0 V,VIN = 1.2V,VOUT = 3.3V 1 μA ILKG Leakage currentintoSW VEN = 0 V,VIN = 1.2V,VSW = 1.2V,VOUT ≥ VIN 0.01 0.2 μA TLV61220 Feedback inputIFB VFB = 0.5V 0.01 μAcurrent IEN EN inputcurrent Clamped on GND orVIN (VIN < 1.5V) 0.005 0.1 μA CONTROL STAGE PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VIL EN inputlowvoltage VIN ≤ 1.5V 0.2× VIN V VIH EN inputhighvoltage VIN ≤ 1.5V 0.8× VIN V VIL EN inputlowvoltage 5 V > VIN > 1.5V 0.4 V VIH EN inputhighvoltage 5 V > VIN > 1.5V 1.2 V VUVLO Undervoltagelockoutthresholdfor VIN decreasing 0.5 0.7 V turnoff Overvoltageprotectionthreshold 5.5 7.5 V Overtemperatureprotection 140 °C Overtemperaturehysteresis 20 °C Copyright© 2012,Texas InstrumentsIncorporated SubmitDocumentationFeedback 3 ProductFolderLink(s):TLV61220
SLVSB53 –MAY 2012 www.ti.com PIN ASSIGNMENTS DBV PACKAGE TOP VIEW TerminalFunctions TERMINAL I/O DESCRIPTION NAME NO. EN 3 I Enableinput(VBAT enabled,GND disabled) FB 4 I Voltagefeedbackforprogrammingtheoutputvoltage GND 2 IC groundconnectionforlogicand power SW 1 I Boostand rectifyingswitchinput VBAT 6 I Supplyvoltage VOUT 5 O Boostconverteroutput FUNCTIONAL BLOCK DIAGRAM (ADJUSTABLE VERSION)
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L1 4.7/c58H VBAT VOUT FB C2 0.7V to VOUT 1.8V to 5.5V TLV61220 www.ti.com SLVSB53 –MAY 2012 PARAMETER MEASUREMENT INFORMATION Table1.ListofComponents: COMPONENT PART NUMBER MANUFACTURER VALUEREFERENCE C 1 GRM188R60J106ME84D Murata 10 μF,6.3V.X5R Ceramic C 2 GRM188R60J106ME84D Murata 10 μF,6.3V.X5R Ceramic L1 1269AS-H-4ZR7N Toko 4.7μH R 1= 1M Ω,R 2= Valuesdependingon theprogrammedR 1,R 2 outputvoltage Copyright© 2012,Texas InstrumentsIncorporated SubmitDocumentationFeedback 5 ProductFolderLink(s):TLV61220
0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 I =330mASW Input Voltage - V Output Current - A Minimum ISW I =400mASW 0.03 0.06 0.09 0.12 0.15 0.18 0.21 0.24 0.27 TLV61220 SLVSB53 –MAY 2012 www.ti.com TYPICAL CHARACTERISTICS TableofGraphs FIGURE InputVoltage,ISW = 330 mA, Minimum ISW = 200 mA, VO = 1.8V 1 OutputCurrent InputVoltage,ISW = 400 mA, Minimum ISW = 200 mA, VO = 3.3V 2 InputVoltage,ISW = 380 mA, Minimum ISW = 200 mA, VO = 5V 3 vs OutputCurrent,VO = 1.8V,VI= [0.7V;1.2V;1.5V] 4 Efficiency vs OutputCurrent,VO = 3.3V,VI= [0.7V;1.2V;2.4V;3V] 5 vs OutputCurrent,VO = 5 V,VI= [0.7V;1.2V;3.6V;4.2V] 6 vs InputVoltage,VO = 1.8V,IO = [100µA;1mA ;10mA; 50mA] 7 Efficiency vs InputVoltage,VO = 3.3V,IO = [100µA;1mA ;10mA; 50mA] 8 vs InputVoltage,VO = 5 V,IO = [100µA;1mA ;10mA; 50mA] 9 vs OutputCurrent,,VO = 1.8V,VI= [0.7V;1.2V] 10 OutputVoltage vs OutputCurrent,,VO = 3.3V,VI= [0.7V;1.2V;2.4V] 11 Load transient,VI= 1.2V,VO = 3.3V,IO = 5mA to20 mA 12 Waveforms Linetransient,VI= 1.8V to2.4V,VO = 3.3V,IO = 30 mA 13 StartupafterEnable,VI= 1.2V,VO = 3.3V,R LOAD = 50 Ω 14 MAXIMUM OUTPUT CURRENT vs INPUT VOLTAGE MAXIMUM OUTPUT CURRENT vs INPUT VOLTAGE (VO =1.8V,Minimum ISW =200mA, L=4.7µH) (VO =3.3V,Minimum ISW =200mA, L=4.7µH) Figure1. Figure2.
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0.01 0.1 1 10 100 G000Output Current - mA Efficiency- % V =0.7VI V =2.4VI V =0.7VI V =3VI V =1.2VI V =3.3Vo 100 0.01 0.1 1 10 100 G000Output Current - mAOutput Current - mA Efficiency - % V =0.7VIV =0.7VI V =0.7VIV =0.7VIV =0.7VIV =1.2VI V =5Vo 100 0.01 0.1 1 10 100 G000Output Current - mA Efficiency- % V =0.7VI V =1.2VI V =1.5VI V =1.8Vo Input Voltage - V Output Current - A Minimum ISW I =380mASW 0.03 0.06 0.09 0.12 0.15 0.18 0.21 0.24 0.27 TLV61220 www.ti.com SLVSB53 –MAY 2012 EFFICIENCY vsMAXIMUM OUTPUT CURRENT vs INPUT VOLTAGE (VO =5V, Minimum ISW =200mA, L=4.7µH) OUTPUT CURRENT AND INPUT VOLTAGE (VO =1.8V) Figure3. Figure4. EFFICIENCY EFFICIENCY vs vs OUTPUT CURRENT AND INPUT VOLTAGE (VO =1.8V) INPUT VOLTAGE AND OUTPUT CURRENT (VO =5V) Figure5. Figure6. Copyright© 2012,Texas InstrumentsIncorporated SubmitDocumentationFeedback 7 ProductFolderLink(s):TLV61220
1.7 1.8 1.8 1.9 1.9 0.01 0.1 1 10 100 Output Current - mA Output Voltage - V V =0.7VIV =0.7VI V =0.7VIV =1.2VI V =0.7VIV =1.8Vo Input Voltage - V Efficiency - % Io=100 A/c58 Io=50mA Io=1mA 100 Io=1mAVo=5V Io=50mA Io=1mA Io=10mA Io=100 A/c58 Vo=1.8V Input Voltage - V Efficiency - % 100 Input Voltage - V Efficiency - % 100 Io=100 A/c58 Io=50mA Io=1mA Io=10mAVo=3.3V TLV61220 SLVSB53 –MAY 2012 www.ti.com EFFICIENCY EFFICIENCY vs vs INPUT VOLTAGE AND OUTPUT CURRENT (VO =1.8V) INPUT VOLTAGE AND OUTPUT CURRENT (VO =3.3V) Figure7. Figure8. EFFICIENCY OUTPUT VOLTAGE vs vs INPUT VOLTAGE AND OUTPUT CURRENT (VO =5V) OUTPUT CURRENT AND INPUT VOLTAGE (VO =1.8V) Figure9. Figure10.
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V = 1.8V to 2.4V, V I = 30mAIN OUTOUT=3.3V, Output Voltage 100mV/div, AC Input Voltage 500mV/div, DC Enable Voltage 2V/div, DC Output Voltage 1V/div, DC Load Current 20mA/div, DC Inductor Current 200mA/div, DC V = 1.2V, V = 50IN /c83OUT LOAD=3.3V, R Output Current - mA Output Voltage - V 3.1 3.2 3.3 3.4 3.5 0.01 0.1 1 10 100 V =0.7VI V =1.2VIV =2.4VI V =3.3Vo Output Current 10mA/div, DC V = 1.2V, V I = 5mA to 20mAIN OUTOUT=3.3V, Output Voltage 20mV/div, AC TLV61220 www.ti.com SLVSB53 –MAY 2012 OUTPUT VOLTAGE vs OUTPUT CURRENT AND INPUT VOLTAGE (VO =3.3V) LOAD TRANSIENT RESPONSE Figure11. Figure12. LINE TRANSIENT RESPONSE START UP AFTER ENABLE Figure13. Figure14. Copyright© 2012,Texas InstrumentsIncorporated SubmitDocumentationFeedback 9 ProductFolderLink(s):TLV61220
t 200□mA (typ.) Continuous□Current□Operation Discontinuous□Current□Operation 200□mA (typ.) TLV61220 SLVSB53 –MAY 2012 www.ti.com DETAILED DESCRIPTION OPERATION The TLV61220 isa highperformance,highefficientboostconverter.To achievehighefficiencythepower stage isrealizedas a synchronousboosttopology.For thepower switchingtwo activelycontrolledlow R DS(on) power MOSFETs areimplemented. CONTROLLER CIRCUIT The deviceiscontrolledby a hystereticcurrentmode controller.Thiscontrollerregulatestheoutputvoltageby keepingthe inductorripplecurrentconstantinthe range of 200 mA and adjustingthe offsetof thisinductor currentdepending on the outputload.In case the requiredaverage inputcurrentislowerthan the average inductorcurrentdefinedby thisconstantrippletheinductorcurrentgetsdiscontinuoustokeep theefficiencyhigh atlowloadconditions. Figure15. HystereticCurrentOperation The outputvoltageVOUT ismonitoredviathefeedbacknetworkwhichisconnectedtothevoltageerroramplifier. To regulatetheoutputvoltage,thevoltageerroramplifiercompares thisfeedbackvoltagetotheinternalvoltage referenceand adjuststherequiredoffsetoftheinductorcurrentaccordingly.At fixedoutputvoltageversionsan internalfeedbacknetworkisused to program the outputvoltage,at adjustableversionsan externalresistor dividerneeds tobe connected. The selfoscillatinghystereticcurrentmode architectureisinherentlystableand allowsfastresponseto load variations.Italsoallowsusinginductorsand capacitorsovera widevaluerange. Device Enable and Shutdown Mode The deviceisenabledwhen EN issethighand shutdown when EN islow.Duringshutdown,theconverterstops switchingand allinternalcontrolcircuitryisturnedoff.Inthiscase theinputvoltageisconnectedtotheoutput throughtheback-gatediodeoftherectifyingMOSFET. Thismeans thattherealwayswillbe voltageattheoutput whichcan be as highas theinputvoltageorlowerdependingon theload. Startup AftertheEN pinistiedhigh,thedevicestartstooperate.Incase theinputvoltageisnothighenough tosupply the controlcircuitproperlya startuposcillatorstartsto operatethe switches.Duringthisphase the switching frequencyiscontrolledby theoscillatorand themaximum switchcurrentislimited.As soon as thedevicehas builtup theoutputvoltagetoabout1.8V, highenough forsupplyingthecontrolcircuit,thedeviceswitchestoits normalhystereticcurrentmode operation.The startuptimedepends on inputvoltageand loadcurrent. OperationatOutput Overload Ifin normal boost operationthe inductorcurrentreaches the internalswitchcurrentlimitthresholdthe main switchisturnedofftostopfurtherincreaseoftheinputcurrent. Inthiscase theoutputvoltagewilldecreasesincethedevicecan notprovidesufficientpower tomaintaintheset outputvoltage. Iftheoutputvoltagedropsbelowtheinputvoltagethebackgatediodeoftherectifyingswitchgetsforwardbiased and currentstartsflowthroughit.Thisdiodecannotbe turnedoff,so the currentfinallyisonlylimitedby the remainingDC resistances.As soon as theoverloadconditionisremoved,theconverterresumes providingthe setoutputvoltage.
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www.ti.com SLVSB53 –MAY 2012 UndervoltageLockout An implementedundervoltagelockoutfunctionstopsthe operationof the converterifthe inputvoltagedrops below thetypicalundervoltagelockoutthreshold.Thisfunctionisimplementedinordertopreventmalfunctioning oftheconverter. OvervoltageProtection If,forany reason,theoutputvoltageisnotfedback properlytotheinputofthevoltageamplifier,controlofthe outputvoltagewillnot work anymore. Thereforean overvoltageprotectionisimplementedto avoidthe output voltageexceedingcriticalvaluesforthedeviceand possiblyforthesystem itissupplying.For thisprotectionthe TLV61220 outputvoltageisalsomonitoredinternally.Incase itreachestheinternallyprogrammed thresholdof 6.5V typicallythevoltageamplifierregulatestheoutputvoltagetothisvalue. IftheTLV61220 isused todriveLEDs, thisfeatureprotectsthecircuitiftheLED fails. OvertemperatureProtection The device has a built-intemperaturesensor which monitorsthe internalIC junctiontemperature.Ifthe temperatureexceeds theprogrammed threshold(seeelectricalcharacteristicstable),thedevicestopsoperating. As soon as the IC temperaturehas decreasedbelow the programmed threshold,itstartsoperatingagain.To preventunstableoperationclosetotheregionofovertemperaturethreshold,a built-inhysteresisisimplemented. Copyright© 2012,Texas InstrumentsIncorporated SubmitDocumentationFeedback 11 ProductFolderLink(s):TLV61220
/c180/c236 /c239 /c180/c237 /c239 /c238 OUT OUT INL,MAX V I + 100 mA; continous current operation0.8 VI = 200 mA; discontinuous current operation /c180/c180/c180 IN OUT IN OUT V (V - V )1L = f 200 mA V SW L1 4.7/c58H VBAT VOUT FB C2 3.3V/20mA 180k/c83 /c230 /c246 /c231 /c247 /c232 /c248 OUT FB VR = R x - 11 2 V TLV61220 SLVSB53 –MAY 2012 www.ti.com
APPLICATION INFORMATION
The TLV61220 isintendedforsystems powered by a singlecellbatterytoup tothreeAlkaline,NiCd or NiMH cellswitha typicalterminalvoltagebetween 0.7V and 5.5V.They can alsobe used insystemspowered by one- cellLi-IonorLi-Polymerbatterieswitha typicalvoltagebetween 2.5V and 4.2V. Additionally,any othervoltage sourcewitha typicaloutputvoltagebetween 0.7V and 5.5V can be used withtheTLV61220. Adjustableoutputvoltageversion An externalresistordividerisused to adjustthe outputvoltage.The resistordividerneeds to be connected between VOUT, FB and GND as shown inFigure16.When theoutputvoltageisregulatedproperly,thetypical voltagevalueat the FB pinis500 mV forthe adjustabledevices.The maximum recommended valueforthe outputvoltageis5.5 V. The currentthroughthe resistivedividershouldbe about 100 timesgreaterthan the currentintothe FB pin.The typicalcurrentintothe FB pin is0.01 μA, and the voltageacrossthe resistor between FB and GND, R 2, istypically500 mV. Based on thosetwo values,the recommended valueforR 2 shouldbe lowerthan 500 kΩ, inorderto setthe dividercurrentto 1 μA or higher.The valueof the resistor connectedbetween VOUT and FB, R 1,dependingon theneeded outputvoltage(VOUT ),can be calculatedusing Equation1: (1) As an example,ifan outputvoltageof3.3V isneeded,a 1-MΩ resistoriscalculatedforR 1 when forR 2 a 180-kΩ has been selected. Figure16. TypicalApplicationCircuitforAdjustableOutput VoltageOption InductorSelection To make surethattheTLV61220 can operate,a suitableinductormust be connectedbetween pinVBAT and pin SW. Inductorvaluesof4.7μH show good performanceoverthewholeinputand outputvoltagerange. Choosingotherinductancevaluesaffectstheswitchingfrequencyfproportionalto1/Las shown inEquation2. (2) Choosing inductorvalueshigherthan 4.7μH can improveefficiencydue to reduced switchingfrequencyand; therefore,withreducedswitchinglosses.Usinginductorvaluesbelow2.2μH isnotrecommended. Having selectedan inductancevalue,the peak currentforthe inductorin steady stateoperationcan be calculated.Equation3 givesthepeak currentestimate. (3)
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/c179 /c1802 LC 2 /c180 /c62 /c180OUT OUT IN V I 0.8 100 mAV TLV61220 www.ti.com SLVSB53 –MAY 2012 For selectingtheinductorthiswould be thesuitablevalueforthecurrentrating.Italsoneeds tobe takeninto accountthatloadtransientsand errorconditionsmay cause higherinductorcurrents. Equation4 helpstoestimatewhetherthedevicewillwork incontinuousordiscontinuousoperationdependingon the operatingpoints.As long as the inequationis true,continuousoperationis typicallyestablished.Ifthe inequationbecomes false,discontinousoperationistypicallyestablished. (4) The followinginductorseriesfromdifferentsuppliershave been used withTLV61220 converters: Table2.ListofInductors VENDOR INDUCTOR SERIES Toko DFE252010C EPL3015 Coilcraft EPL2010 Murata LQH3NP TaiyoYuden NR3015 Wurth Elektronik WE-TPC Typ S CapacitorSelection InputCapacitor At leasta 10-μF inputcapacitorisrecommended toimprovetransientbehavioroftheregulatorand EMI behavior ofthetotalpower supplycircuit.A ceramiccapacitorplacedas closeas possibletotheVBAT and GND pinsof theIC isrecommended. Output Capacitor For theoutputcapacitorC 2 ,itisrecommended touse smallceramiccapacitorsplacedas closeas possibleto theVOUT and GND pinsoftheIC.If,forany reason,theapplicationrequirestheuse oflargecapacitorswhich can not be placedcloseto the IC,the use of a smallceramiccapacitorwithan capacitancevalueof around 2.2μF inparalleltothelargeone isrecommended. Thissmallcapacitorshouldbe placedas closeas possibleto theVOUT and GND pinsoftheIC. A minimum capacitancevalueof4.7μF shouldbe used,10 μF arerecommended. Iftheinductorvalueexceeds 4.7μH, thevalueoftheoutputcapacitancevalueneeds tobe halftheinductancevalueor higherforstability reasons,see Equation5. (5) The TLV61220 isnot sensitiveto the ESR interms of stability.Using low ESR capacitors,such as ceramic capacitors,isrecommended anyway tominimizeoutputvoltageripple.Ifheavy loadchanges areexpected,the outputcapacitorvalueshouldbe increasedtoavoidoutputvoltagedropsduringfastloadtransients. Copyright© 2012,Texas InstrumentsIncorporated SubmitDocumentationFeedback 13 ProductFolderLink(s):TLV61220
SLVSB53 –MAY 2012 www.ti.com Layout Considerations As forallswitchingpower supplies,thelayoutisan importantstepinthedesign,especiallyathighpeak currents and highswitchingfrequencies.Ifthelayoutisnotcarefullydone,theregulatorcouldshow stabilityproblemsas wellas EMI problems.Therefore,use wide and shorttracesforthemain currentpathand forthepower ground paths.The inputand outputcapacitor,as wellas theinductorshouldbe placedas closeas possibletotheIC. The feedbackdividershouldbe placedas closeas possibletothecontrolground pinoftheIC.To layoutthe ground,itisrecommended to use shorttracesas well,separatedfrom the power ground traces.Thisavoids ground shiftproblems,which can occur due to superimpositionof power ground currentand controlground current.AssurethatthegroundtracesareconnectedclosetothedeviceGND pin. THERMAL INFORMATION Implementationof integratedcircuitsin low-profileand fine-pitchsurface-mountpackages typicallyrequires specialattentiontopower dissipation.Many system-dependentissuessuch as thermalcoupling,airflow,added heat sinksand convectionsurfaces,and the presenceof otherheat-generatingcomponents affectthe power- dissipationlimitsofa givencomponent. Threebasicapproachesforenhancingthermalperformancearelistedbelow.
- Improvingthepower-dissipationcapabilityofthePCB design
- Improvingthethermalcouplingofthecomponent tothePCB
- Introducingairflowinthesystem For more detailson how touse thethermalparametersinthedissipationratingstablepleasecheck theThermal CharacteristicsApplicationNote (SZZA017) and theIC Package ThermalMetricsApplicationNote (SPRA953).
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www.ti.com 14-Jun-2012 Addendum-Page 1 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/ Ball Finish MSL Peak Temp (3) Samples (Requires Login) TLV61220DBVR ACTIVE SOT-23 DBV 6 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM TLV61220DBVT ACTIVE SOT-23 DBV 6 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM (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) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. 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.
*All dimensions are nominal Device Package Type Package Drawing Pins SPQ Reel Diameter (mm) Reel Width W1 (mm) (mm) (mm) (mm) (mm) W (mm) Pin1 Quadrant PACKAGE MATERIALS INFORMATION www.ti.com 14-Jun-2012 Pack Materials-Page 1
*All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TLV61220DBVR SOT-23 DBV 6 3000 180.0 180.0 18.0 TLV61220DBVT SOT-23 DBV 6 250 180.0 180.0 18.0 PACKAGE MATERIALS INFORMATION www.ti.com 14-Jun-2012 Pack Materials-Page 2
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