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LTC3858EUFD-1 Datasheet(PDF) 3 Page - Linear Technology |
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LTC3858EUFD-1 Datasheet(HTML) 3 Page - Linear Technology |
3 / 38 page LTC3858-1 38581fb SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN InputSupplyOperatingVoltageRange 4 38 V VFB1,2 RegulatedFeedbackVoltage (Note4)ITH1,2=1.2V –40°Cto125°C –40°Cto85°C l 0.788 0.792 0.800 0.800 0.812 0.808 V V IFB1,2 FeedbackCurrent (Note4) ±5 ±50 nA VREFLNREG ReferenceVoltageLineRegulation (Note4)VIN=4.5Vto38V 0.002 0.02 %/V VLOADREG OutputVoltageLoadRegulation (Note4) MeasuredinServoLoop, ∆ITHVoltage=1.2Vto0.7V l 0.01 0.1 % (Note4) MeasuredinServoLoop, ∆ITHVoltage=1.2Vto2V l –0.01 –0.1 % gm1,2 TransconductanceAmplifiergm (Note4)ITH1,2=1.2V,Sink/Source=5µA 2 mmho IQ InputDCSupplyCurrent (Note5) PulseSkiporForcedContinuousMode (OneChannelOn) RUN1=5VandRUN2=0Vor RUN1=0VandRUN2=5V, VFB1=0.83V(NoLoad) 1.3 mA PulseSkiporForcedContinuousMode (BothChannelsOn) RUN1,2=5V,VFB1,2=0.83V(NoLoad) 2 mA SleepMode(OneChannelOn) RUN1=5VandRUN2=0Vor RUN1=0VandRUN2=5V, VFB1=0.83V(NoLoad) 170 250 µA SleepMode(BothChannelsOn) RUN1,2=5V,VFB1,2=0.83V(NoLoad) 300 450 µA Shutdown RUN1,2=0V 8 20 µA UVLO UndervoltageLockout INTVCCRampingUp INTVCCRampingDown l l 3.6 4.0 3.8 4.2 4.0 V V VOVL FeedbackOvervoltageProtection MeasuredatVFB1,2,RelativetoRegulatedVFB1,2 7 10 13 % ISENSE+ SENSE+PinCurrent EachChannel ±1 µA ISENSE– SENSE–PinsCurrent EachChannel VOUT1,2<INTVCC–0.5 VOUT1,2>INTVCC+0.5 540 ±1 700 µA µA DFMAX MaximumDutyFactor InDropout,FREQ=0V 98 99.4 % ISS1,2 Soft-StartChargeCurrent VSS1,2=0V 0.7 1.0 1.4 µA VRUN1,2On RUNPinOnThresholdVoltage VRUN1,VRUN2Rising l 1.23 1.28 1.33 V VRUN1,2Hyst RUNPinHysteresisVoltage 50 mV VSS1,2LA SSPinLatch-OffArmingThreshold Voltage VSS1,VSS2Risingfrom1V 1.9 2 2.1 V VSS1,2LT SSPinLatch-OffThresholdVoltage VSS1,VSS2Risingfrom2V 1.3 1.5 1.7 V IDSC1,2LT SSDischargeCurrent Short-CircuitConditionVFB1,2=0.5V VSS1,2=4.5V 7 10 13 µA VSENSE(MAX) MaximumCurrentSenseThreshold Voltage VFB1,2=0.7V,VSENSE1–,2–=3.3V l 43 50 57 mV Gate Driver TG1,2 Pull-UpOn-Resistance Pull-DownOn-Resistance 2.5 1.5 Ω Ω BG1,2 Pull-UpOn-Resistance Pull-DownOn-Resistance 2.4 1.1 Ω Ω elecTrical characTerisTics The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted. |
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