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LTC3857IGN-1PBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC3857IGN-1PBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 38 page LTC3857-1 38571fa Typical applicaTion FeaTures applicaTions DescripTion Low IQ, Dual, 2-Phase Synchronous Step-Down Controller High Efficiency Dual 3.3V/8.5V Step-Down Converter n Low Operating IQ: 50µA (One Channel On) n Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V n Wide VIN Range: 4V to 38V n RSENSE or DCR Current Sensing n Out-of-PhaseControllersReduceRequiredInput CapacitanceandPowerSupplyInducedNoise n OPTI-LOOP®CompensationMinimizesCOUT n Phase-LockableFrequency(75kHz-850kHz) n ProgrammableFixedFrequency(50kHz-900kHz) n SelectableContinuous,Pulse-SkippingorLowRipple BurstMode®OperationatLightLoads n VeryLowDropoutOperation:99%DutyCycle n AdjustableOutputVoltageSoft-StartorTracking n PowerGoodOutputVoltageMonitor n OutputOvervoltageProtection n LowShutdownIQ:<8µA n InternalLDOPowersGateDrivefromVINorEXTVCC n NoCurrentFoldbackDuringStart-Up n NarrowSSOPPackage n AutomotiveAlways-OnSystems n BatteryOperatedDigitalDevices n DistributedDCPowerSystems 0.1µF 62.5k 3.3µH 680pF 150µF 1µF 22µF 50V 0.007Ω 20k 15k VOUT1 3.3V 5A 150µF 0.1µF 193k 7.2µH 680pF 0.010Ω 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 TRACK/SS1 TRACK/SS2 VIN 9V TO 38V 38571 TA01 0.1µF 0.1µF LTC3857-1 Efficiency and Power Loss vs Output Current TheLTC®3857-1isahighperformancedualstep-down switchingregulatorcontrollerthatdrivesallN-channel synchronouspowerMOSFETstages.Aconstantfrequency currentmodearchitectureallowsaphase-lockablefre- quencyofupto850kHz.Powerlossandnoiseduetothe ESRoftheinputcapacitorESRareminimizedbyoperating thetwocontrolleroutputstagesoutofphase. The50μAno-loadquiescentcurrentextendsoperatinglife inbattery-poweredsystems.TheLTC3857-1featuresapre- cision0.8Vreferenceandapowergoodoutputindicator.A wide4Vto38Vinputsupplyrangeencompassesawiderange ofintermediatebusvoltagesandbatterychemistries. IndependentTRACK/SSpinsforeachcontrollerrampthe outputvoltagesduringstart-up.Currentfoldbacklimits MOSFETheatdissipationduringshort-circuitconditions. ThePLLIN/MODEpinselectsamongBurstModeopera- tion,pulse-skippingmode,orcontinuousinductorcurrent modeatlightloads. Foraleadless32-pinQFNpackagewiththeadditionalfea- turesofadjustablecurrentlimit,clockout,phasemodula- tionandtwoPGOODoutputs,seetheLTC3857datasheet. OUTPUT CURRENT (A) 0.00001 0.0001 40 50 60 70 80 0.001 0.01 0.1 1 10 3857 TA01b 30 20 10 0 90 100 10 100 1000 1 0.1 10000 VIN = 12V VOUT = 3.3V FIGURE 13 CIRCUIT L ,LT,LTC,LTM,BurstMode,OPTI-LOOP,µModule,LinearTechnologyandtheLinearlogo areregisteredtrademarksandNoRSENSEandUltraFastaretrademarksofLinearTechnology Corporation.Allothertrademarksarethepropertyoftheirrespectiveowners.Protectedby U.S.Patents,including5481178,5929620,6177787,6144194,5408150,6580258,5705919, 6100678. |
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