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LTC3865EUH-1PBF Datasheet(PDF) 10 Page - Linear Technology |
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LTC3865EUH-1PBF Datasheet(HTML) 10 Page - Linear Technology |
10 / 36 page LTC3865/LTC3865-1 0 3865f MODE/PLLIN (Pin 27/Pin 36): Force Continuous Mode, BurstModeorPulse-SkipModeSelectionPinandExternal Synchronization Input to Phase Detector Pin. Connect this pin to SGND to force both channels in continuous mode of operation.ConnecttoINTVCCtoenablepulse-skipmodeof operation. Leaving the pin floating will enable Burst Mode operation. A clock on the pin will force the controller into continuousmodeofoperationandsynchronizetheinternal oscillator with the clock on this pin. FREQ (Pin 29/Pin 38): This pin sets the frequency of the internal oscillator. A constant current of 7.5µA is flowing out of this pin and a resistor connected to this pin sets its DC voltage, which in turn, sets the frequency of the internal oscillator. RUN1, RUN2 (Pins 30, 11/Pins 1, 17): Run Control Inputs. A voltage above 1.2V on either pin turns on the IC. However, forcing either of these pins below 1.2V causes the IC to shut down the circuitry required for that particular channel. There are 1µA pull-up currents for these pins. Once the RUN pin rises above 1.2V, an additional 4.5µA pull-up current is added to the pin. pin FuncTions (QFN/TSSOP) SENSE1+, SENSE2+ (Pins 31, 10/Pins 2, 16): Current Sense Comparator Inputs. The (+) inputs to the current comparators are normally connected to DCR sensing networks or current sensing resistors. SENSE1–, SENSE2– (Pins 32, 9/Pin 3, 15): Current Sense ComparatorInputs.The(–)inputstothecurrentcompara- tors are connected to the outputs. SGND (Pin 33/Pin 8): Signal Ground. All small-signal components and compensation components should connect to this ground, which in turn connects to PGND at one point. Pin 33 is the Exposed Pad and available for QFN package. SGND (Exposed Pad Pin 33/ Exposed Pad Pin 39): Signal Ground.MustbesolderedtoPCB,providingalocalground for the control components of the IC, and be tied to the PGND pin under the IC. PGND1, PGND2 (NA/Pins 32, 26): Power Ground Pin. Connect this pin closely to the sources of the bottom N-channel MOSFETs, the (–) terminal of CVCC and the (–) terminal of CIN. |
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