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LT3071MPUFD Datasheet(PDF) 1 Page - Linear Technology |
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LT3071MPUFD Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  LT3071 3071f ApplicAtions n FPGAandDSPSupplies n ASICandMicroprocessorSupplies n ServersandStorageDevices n PostBuckRegulationandSupplyIsolation typicAl ApplicAtion Description 5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator with Analog Margining TheLT®3071isalowvoltage,UltraFast™transientre- sponselinearregulator.Thedevicesuppliesupto5Aof outputcurrentwithatypicaldropoutvoltageof85mV. A 0.01µF reference bypass capacitor decreases output voltagenoiseto25µVRMS.TheLT3071’shighbandwidth permitstheuseoflowESRceramiccapacitors,saving bulkcapacitanceandcost.TheLT3071’sfeaturesmake itidealforhighperformanceFPGAs,microprocessorsor sensitivecommunicationsupplyapplications. Outputvoltageisdigitallyselectablein50mVincrements overa0.8Vto1.8Vrange.Ananalogmarginingfunction allowstheusertoadjustsystemoutputvoltageovera continuous±10%range.TheICincorporatesaunique trackingfunctiontocontrolabuckregulatorpowering theLT3071’sinput.Thistrackingfunctiondrivesthebuck regulatortomaintaintheLT3071’sinputvoltagetoVOUT +300mV,minimizingpowerdissipation. InternalprotectionincludesUVLO,reverse-currentprotec- tion,precisioncurrentlimitingwithpowerfoldbackand thermalshutdown.TheLT3071regulatorisavailableina thermallyenhanced28-lead,4mm ×5mmQFNpackage. 0.9V, 5A Regulator FeAtures n Output Current: 5A n Dropout Voltage: 85mV Typical n Digitally Programmable VOUT: 0.8V to 1.8V n Analog Output Margining: ±10% Range n Low Output Noise: 25µVRMS (10Hz to 100kHz) n Parallel Multiple Devices for 10A or More n Precision Current Limit: ±20% n OutputCurrentMonitor:IMON=IOUT/2500 n ±1%AccuracyOverLine,LoadandTemperature n StablewithLowESRCeramicOutputCapacitors (15µFMinimum) n HighFrequencyPSRR:30dBat1MHz n EnableFunctionTurnsOutputOn/Off n VIOCPinControlsBuckConvertertoMaintainLow PowerDissipationandOptimizeEfficiency n PWRGD/UVLO/ThermalShutdownFlag n CurrentLimitwithFoldbackProtection n ThermalShutdown n 28-Lead(4mm ×5mm×0.75mm)QFNPackage Dropout Voltage L ,LT,LTC,LTM,LinearTechnologyandtheLinearlogoareregisteredtrademarksofLinear TechnologyCorporation.UltraFastandVLDOaretrademarksofLinearTechnologyCorporation. Allothertrademarksarethepropertyoftheirrespectiveowners.Patentspending. OUTPUT CURRENT (A) 0 90 120 150 4 3071 TA01b 60 30 0 1 2 3 5 VOUT = 1.8V VBIAS = 3.3V VOUT = 0.8V VBIAS = 2.5V VIN = VOUT(NOMINAL) BIAS 50k LT3071 IN EN VO0 VO1 330µF 2.2µF 2.2µF* 0.01µF 1k *X5R OR X7R CAPACITORS 1nF NC 4.7µF* 3071 TA01a 10µF* PWRGD VOUT 0.9V 5A VMON 2V AT 5A FULL SCALE VO2 MARGA VIOC SENSE OUT VBIAS 2.2V TO 3.6V VIN 1.2V PWRGD REF/BYP IMON GND |
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