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LTC3854IDDB Datasheet(PDF) 7 Page - Linear Technology |
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LTC3854IDDB Datasheet(HTML) 7 Page - Linear Technology |
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7 / 28 page  LTC3854 3854fa pin FuncTions FB(Pin1):ErrorAmplifierFeedbackInput.Thispinreceives the remotely-sensed feedback voltage from an external resistor divider across the output. ITH(Pin2):ErrorAmplifierOutputandSwitchingRegulator Compensation Point. The current comparator trip point increases with this control voltage. RUN/SS (Pin 3): Run Control, Soft-Start. If the voltage on this pin is held below 0.4V, the part is in shutdown. If the pin is released the capacitance to ground at this pin sets the soft-start ramp rate. An internal 1.25µA soft-start current is always charging this pin. BOOST(Pin4):BootstrappedSupplytotheTopSideFloat- ing Driver. A low ESR capacitor is connected between the BOOST and SW pins and an external Schottky diode is tied between the BOOST and INTVCC pins. The voltage swing on the BOOST pin is INTVCC to (VIN + INTVCC). TG (Pin 5): High Current Gate Drive for Top N-channel MOSFET. This is the output of floating driver with a volt- age swing equal to INTVCC superimposed on the switch node voltage. SW (Pin 6): Switch Node Connection to Inductor. The volt- age swing on this pin is from a Schottky diode (external) forward voltage (when this diode is added across the N- channel synchronous MOSFET) below ground to VIN. GND (Pin 7): Small Signal and Power Ground. This is the high current ground for the gate driver. The internal signal ground is Kelvin connected to this pin for noise suppression. BG (Pin 8): High Current Gate Drive for Bottom (Synchro- nous) N-channel MOSFET. The voltage swing at this pin is from ground to INTVCC. INTVCC (Pin 9): Output of the Internal 5V Low Dropout Regulator. The driver and control circuits are powered from this voltage. Must be decoupled to power ground with a minimum of 2.2µF low ESR ceramic capacitor (X5R or better). VIN (Pin 10): Main Supply Pin. A bypass capacitor should be tied between this pin and the signal ground pin. SENSE– (Pin 11): The (–) Input to the Differential Current Comparator. SENSE+ (Pin 12): The (+) Input to the Differential Current Comparator. The ITH pin voltage and controlled offsets between the SENSE– and SENSE+ pins in conjunction with RSENSE (or RDCR) set the peak current trip threshold. SGND (Exposed Pad Pin 13): The exposed pad must be soldered to PCB ground for electrical contact and rated thermal performance. |
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