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LTC3868IGN-1TRPBF Datasheet(PDF) 8 Page - Linear Technology |
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LTC3868IGN-1TRPBF Datasheet(HTML) 8 Page - Linear Technology |
8 / 38 page LTC3868-1 38681fb pin FuncTions (QFN/SSOP) SENSE1–, SENSE2– (Pin 2, Pin 4/Pin 8, Pin 10):The(–) InputtotheDifferentialCurrentComparators.Whengreater thanINTVCC–0.5V,theSENSE–pinsuppliescurrentto thecurrentcomparator. FREQ (Pin 3/Pin 5):TheFrequencyControlPinforthe InternalVCO.ConnectingthispintoGNDforcestheVCO toafixedlowfrequencyof350kHz.Connectingthispin toINTVCCforcestheVCOtoafixedhighfrequencyof 535kHz.Otherfrequenciesbetween50kHzand900kHzcan beprogrammedusingaresistorbetweenFREQandGND. Aninternal20µApull-upcurrentdevelopsthevoltageto beusedbytheVCOtocontrolthefrequency PLLIN/MODE (Pin 4/Pin 6): External Synchronization Input to Phase Detector and Forced Continuous Mode Input.Whenanexternalclockisappliedtothispin,the phase-lockedloopwillforcetherisingTG1signaltobe synchronizedwiththerisingedgeoftheexternalclock. Whennotsynchronizingtoanexternalclock,thisinput, which acts on both controllers, determines how the LTC3868-1 operates at light loads. Pulling this pin to groundselectsBurstModeoperation.Aninternal100k resistor to ground also invokes Burst Mode operation whenthepinisfloated.TyingthispintoINTVCCforces continuousinductorcurrentoperation.Tyingthispinto avoltagegreaterthan1.2VandlessthanINTVCC–1.3V selectspulse-skippingoperation. SGND (Pin 5, Exposed Pad Pin 29/Pin 7):Small-signal ground common to both controllers, must be routed separatelyfromhighcurrentgroundstothecommon(–) terminalsoftheCINcapacitors.Theexposedpad(QFN only) must be soldered to the PCB for rated thermal performance. RUN1, RUN2 (Pin 6, Pin 8/Pin 7, Pin 9):DigitalRun ControlInputsforEachController.Forcingeitherofthese pinsbelow1.26Vshutsdownthatcontroller.Forcingboth ofthesepinsbelow0.7VshutsdowntheentireLTC3868-1, reducingquiescentcurrenttoapproximately8µA.Donot floatthesepins. INTVCC vs Load Current Latchoff Thresholds vs Temperature Typical perForMance characTerisTics LOAD CURRENT (mA) 0 5.10 5.15 5.20 160 38681 G26 5.05 5.00 4.95 20 40 60 80 100 120 140 180 200 EXTVCC = 0V VIN = 12V EXTVCC = 8V TEMPERATURE (°C) –45 1.2 1.3 1.5 1.6 1.7 2.3 2.2 1.9 5 55 80 38681 G27 1.4 2.0 2.1 1.8 –20 30 105 130 ARMING THRESHOLD LATCH-OFF THRESHOLD |
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