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LT3092 Datasheet(PDF) 7 Page - Linear Technology |
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LT3092 Datasheet(HTML) 7 Page - Linear Technology |
7 / 22 page LT3092 7 3092fb PIN FUNCTIONS (DD/ST/TS8) IN (Pins 7, 8/Pin 3/Pins 7, 8): Input. This pin supplies power to bias internal circuitry and supply output load current. For the device to operate properly and regulate, the voltage on this pin must be 1.2V to 1.4V above the OUT pin (depending on output load current—see the dropout voltage specifications in the Electrical Charac- teristics table). NC (Pins 3, 5, 6/NA/Pins 1, 6): No Connection. These pins have no connection to internal circuitry and may be tied to IN, OUT, GND or floated. OUT (Pins 1, 2/Pin 2/Pins 2, 3, 4): Output. This is the power output of the device. The minimum current source value to which the LT3092 can be set is 0.5mA or the device will not regulate. SET (Pin 4/Pin 1/Pin 5): Set. This pin is the error ampli- fier’s noninverting input and also sets the operating bias point of the circuit. A fixed 10μA current source flows out of this pin. Two resistors program IOUT as a function of the resistor ratio relative to 10μA. Output current range is 0.5mA to the maximum rated 200mA level. Exposed Pad/Tab (Pin 9/Tab/NA): Output. The Exposed Pad of the DFN package and the Tab of the SOT-223 package are tied internally to OUT. Tie them directly to the OUT pins (Pins 1, 2/Pin 2) at the PCB. The amount of copper area and planes connected to OUT determine the effective thermal resistance of the packages (see the Applications Information section). BLOCK DIAGRAM IN SET OUT 10μA 3092 BD |
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