LT3092 datasheet(7/22 Pages) LINER

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LT3092

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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

SET

OUT

10μA

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