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LTC3868IUFD-1TRPBF Datasheet(PDF) 3 Page - Linear Technology |
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LTC3868IUFD-1TRPBF Datasheet(HTML) 3 Page - Linear Technology |
3 / 38 page LTC3868-1 38681fb SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN InputSupplyOperatingVoltageRange 4 24 V VFB1,2 RegulatedFeedbackVoltage (Note4)ITH1,2Voltage=1.2V l 0.788 0.8 0.812 V IFB1,2 FeedbackCurrent (Note4) ±5 ±50 nA VREFLNREG ReferenceVoltageLineRegulation (Note4)VIN=4.5Vto24V 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) Pulse-SkippingorForcedContinuous Mode (OneChannelOn) RUN1=5VandRUN2=0Vor RUN1=0VandRUN2=5V, VFB1=0.83V(NoLoad) 1.3 mA Pulse-SkippingorForcedContinuous Mode (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 25 µA UVLO UndervoltageLockout INTVCCRampingUp INTVCCRampingDown l l 3.6 4 3.8 4.2 4 V V VOVL FeedbackOvervoltageProtection MeasuredatVFB1,2,RelativetoRegulated VFB1,2 7 10 13 % ISENSE+ SENSE+PinCurrent EachChannel ±1 µA ISENSE– SENSE–PinsCurrent EachChannel VOUT1,2<INTVCC–0.5V VOUT1,2>INTVCC+0.5V 540 ±1 700 µA µA DFMAX MaximumDutyFactor InDropout,FREQ=0V 98 99.4 % ISS1,2 Soft-StartChargeCurrent VSS1,2=0V 0.7 1 1.4 µA VRUN1,2On RUNPinOnThreshold VRUN1,VRUN2Rising l 1.21 1.26 1.31 V VRUN1,2Hyst RUNPinHysteresis 50 mV VSS1,2LA SSPinLatchoffArmingThreshold VSS1,VSS2Risingfrom1V 1.9 2 2.1 V VSS1,2LT SSPinLatchoffThreshold 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 VFB1,2=0.7V,VSENSE1–,2–=3.3V 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 temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted. |
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