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LTC3868IUHTRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC3868IUHTRPBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 38 page LTC3868 3868fb Typical applicaTion FeaTures applicaTions DescripTion Low IQ, Dual 2-Phase Synchronous Step-Down Controller High Efficiency Dual 8.5V/3.3V Step-Down Converter n Low Operating IQ: 170µA (One Channel On) n Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 14V n Wide VIN Range: 4V to 24V n RSENSE or DCR Current Sensing n Out-of-PhaseControllersReduceRequiredInput CapacitanceandPowerSupplyInducedNoise n OPTI-LOOP®CompensationMinimizesCOUT n Phase-LockableFrequency(75kHzto850kHz) n ProgrammableFixedFrequency(50kHzto900kHz) n SelectableContinuous,Pulse-Skippingor BurstMode®OperationatLightLoads n VeryLowDropoutOperation:99%DutyCycle n AdjustableOutputVoltageSoft-Start n PowerGoodOutputVoltageMonitor n OutputOvervoltageProtection n OutputLatchoffProtectionDuringShortCircuit n LowShutdownIQ:8µA n InternalLDOPowersGateDrivefromVINorEXTVCC n NoCurrentFoldbackDuringStart-Up n Small5mm ×5mmQFNPackage n NotebookandPalmtopComputers n PortableInstruments n BatteryOperatedDigitalDevices n DistributedDCPowerSystems L ,LT,LTC,LTM,BurstMode,OPTI-LOOP,PolyPhase,µModule,LinearTechnologyandtheLinear logoareregisteredtrademarksandNoRSENSEandUltraFastaretrademarksofLinearTechnology Corporation.Allothertrademarksarethepropertyoftheirrespectiveowners.ProtectedbyU.S. Patents,including5481178,5705919,5929620,6100678,6144194,6177787,6304066,6580258. Efficiency and Power Loss vs Load Current The LTC®3868 is a high performance dual step-down switchingregulatorcontrollerthatdrivesallN-channel synchronouspowerMOSFETstages.Aconstantfrequency currentmodearchitectureallowsaphase-lockablefre- quencyofupto850kHz.Powerlossandnoiseduetothe inputcapacitorESRareminimizedbyoperatingthetwo controlleroutputsoutofphase. The170μAno-loadquiescentcurrentextendsoperating lifeinbattery-poweredsystems.OPTI-LOOPcompensa- tionallowsthetransientresponsetobeoptimizedover awiderangeofoutputcapacitanceandESRvalues.The LTC3868featuresaprecision0.8Vreferenceandapower goodoutputindicator.Awide4Vto24Vinputsupplyrange encompassesawiderangeofintermediatebusvoltages andbatterychemistries. Independentsoft-startpinsforeachcontrollerrampthe outputvoltagesduringstart-up.Currentfoldbacklimits MOSFETheatdissipationduringshort-circuitconditions. Theoutputshort-circuitlatchofffeaturefurtherprotects thecircuitinshort-circuitconditions. Foraleaded28-leadSSOPpackagewithafixedcurrent limitandonePGOODoutput,withoutphasemodulation oraclockoutput,seetheLTC3868-1datasheet. 0.1µF 62.5k 3.3µH 680pF 150µF 4.7µF 22µF 50V 0.007Ω 20k 15k VOUT1 3.3V 5A 150µF 0.1µF 193k 7.2µH 680pF 0.01Ω 20k 15k VOUT2 8.5V 3.5A TG1 TG2 BOOST1 BOOST2 SW1 SW2 BG1 BG2 SGND PGND SENSE1+ SENSE2+ SENSE1– SENSE2– VFB1 VFB2 ITH1 ITH2 VIN INTVCC SS1 SS2 VIN 9V TO 24V 3868 TA01 0.1µF 0.1µF LTC3868 OUTPUT CURRENT (A) 0.0001 40 50 60 70 80 0.001 0.01 0.1 1 10 3868 TA01b 30 20 10 0 90 100 10 100 1000 1 0.1 10000 EFFICIENCY POWER LOSS VIN = 12V VOUT = 3.3V FIGURE 12 CIRCUIT |
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