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LTC3868-1 Datasheet(PDF) 4 Page - Linear Technology |
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LTC3868-1 Datasheet(HTML) 4 Page - Linear Technology |
4 / 38 page LTC3868-1 38681fb 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. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS TG1,2tr TG1,2tf TGTransitionTime: RiseTime FallTime (Note6) CLOAD=3300pF CLOAD=3300pF 25 16 ns ns BG1,2tr BG1,2tf BGTransitionTime: RiseTime FallTime (Note6) CLOAD=3300pF CLOAD=3300pF 28 13 ns ns TG/BGt1D TopGateOfftoBottomGateOnDelay SynchronousSwitch-OnDelayTime CLOAD=3300pFEachDriver 30 ns BG/TGt1D BottomGateOfftoTopGateOnDelay TopSwitch-OnDelayTime CLOAD=3300pFEachDriver 30 ns tON(MIN) MinimumOn-Time (Note7) 95 ns INTVCC Linear Regulator VINTVCCVIN InternalVCCVoltage 6V<VIN<24V,VEXTVCC=0V 4.85 5.1 5.35 V VLDOVIN INTVCCLoadRegulation ICC=0mAto50mA,VEXTVCC=0V 0.7 1.1 % VINTVCCEXT InternalVCCVoltage 6V<VEXTVCC<13V 4.85 5.1 5.35 V VLDOEXT INTVCCLoadRegulation ICC=0mAto50mA,VEXTVCC=8.5V 0.6 1.1 % VEXTVCC EXTVCCSwitchoverVoltage EXTVCCRampingPositive 4.5 4.7 4.9 V VLDOHYS EXTVCCHysteresis 250 mV Oscillator and Phase-Locked Loop f25kΩ ProgrammableFrequency RFREQ=25k,PLLIN/MODE=DCVoltage 105 kHz f65kΩ ProgrammableFrequency RFREQ=65k,PLLIN/MODE=DCVoltage 375 440 505 kHz f105kΩ ProgrammableFrequency RFREQ=105k,PLLIN/MODE=DCVoltage 835 kHz fLOW LowFixedFrequency VFREQ=0V,PLLIN/MODE=DCVoltage 320 350 380 kHz fHIGH HighFixedFrequency VFREQ=INTVCC,PLLIN/MODE=DCVoltage 485 535 585 kHz fSYNC SynchronizableFrequency PLLIN/MODE=ExternalClock l 75 850 kHz PGOOD1 Output VPGL PGOOD1VoltageLow IPGOOD=2mA 0.2 0.4 V IPGOOD PGOOD1LeakageCurrent VPGOOD=5V ±1 µA VPG PGOOD1TripLevel VFBwithRespecttoSetRegulatedVoltage VFBRampingNegative Hysteresis –13 –10 2.5 –7 % % VFBwithRespecttoSetRegulatedVoltage VFBRampingPositive Hysteresis 7 10 2.5 13 % % tPG DelayforReportingaFault(PGOODLow) 25 µs Note 1:StressesbeyondthoselistedunderAbsoluteMaximumRatings maycausepermanentdamagetothedevice.ExposuretoanyAbsolute MaximumRatingsforextendedperiodsmayaffectdevicereliabilityand lifetime. Note 2:TheLTC3868E-1isguaranteedtomeetperformancespecifications from0°Cto85°C.Specificationsoverthe–40°Cto85°Coperating temperaturerangeareassuredbydesign,characterizationandcorrelation withstatisticalprocesscontrols.TheLTC3868I-1isguaranteedoverthe full–40°Cto85°Coperatingtemperaturerange. Note 3:TJiscalculatedfromtheambienttemperatureTAandpower dissipationPDaccordingtothefollowingformula: TJ=TA+(PD•θJA) where θJA=43°CfortheQFNpackageandθJA=90°CfortheSSOP package. Note 4:TheLTC3868-1istestedinafeedbackloopthatservosVITH1,2toa specifiedvoltageandmeasurestheresultantVFB1,2. Note 5:Dynamicsupplycurrentishigherduetothegatechargebeing deliveredattheswitchingfrequency.SeeApplicationsinformation. Note 6:Riseandfalltimesaremeasuredusing10%and90%levels.Delay timesaremeasuredusing50%levels. Note 7:Theminimumon-timeconditionisspecifiedforaninductor peak-to-peakripplecurrent≥40%ofIMAX(SeeMinimumOn-Time ConsiderationsintheApplicationsInformationsection). |
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