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LT3080

3080fb

TYPICAL PERFORMANCE CHARACTERISTICS

Output Voltage Noise

Error Ampliﬁer Gain and Phase

FREQUENCY (Hz)

–30

–10

10k

100k

100

3080 G28

–20

–15

–25

–5

–200

300

–100

100

200

–50

250

–150

150

IL = 1.1A

IL = 100mA

IL = 1.1A

VOUT

100μV/DIV

TIME 1ms/DIV

3080 G26

VOUT = 1V

RSET = 100k

CSET = O.1μF

COUT = 10μF

ILOAD = 1.1A

VCONTROL (Pin 5/Pin 5/Pin 4/Pin 4/NA): This pin is the

supply pin for the control circuitry of the device. The cur-

rent ﬂow into this pin is about 1.7% of the output current.

For the device to regulate, this voltage must be more than

1.2V to 1.35V greater than the output voltage (see dropout

speciﬁcations).

IN (Pins 7, 8/Pins 7, 8/Pin 5/Pin 5/Pin 3): This is the

collector to the power device of the LT3080. The output

load current is supplied through this pin. For the device

to regulate, the voltage at this pin must be more than

0.1V to 0.5V greater than the output voltage (see dropout

speciﬁcations).

NC (Pin 6/Pin 6/Pin 1/Pin 1/NA): No Connection. No con-

nect pins have no connection to internal circuitry and may

be tied to VIN, VCONTROL, VOUT, GND or ﬂoated.

OUT (Pins 1-3/Pins 1-3/Pin 3/Pin 3/Pin 2): This is the

power output of the device. There must be a minimum

load current of 1mA or the output may not regulate.

SET (Pin 4/Pin 4/Pin 2/Pin 2/Pin 1): This pin is the input

to the error ampliﬁer and the regulation set point for

the device. A ﬁxed current of 10μA ﬂows out of this pin

through a single external resistor, which programs the

output voltage of the device. Output voltage range is zero

to the absolute maximum rated output voltage. Transient

performance can be improved by adding a small capacitor

from the SET pin to ground.

Exposed Pad (Pin 9/Pin 9/NA/NA/NA): OUT on MS8E and

DFN packages.

TAB: OUT on DD-Pak, TO-220 and SOT-223 packages.

PIN FUNCTIONS (DD/MS8E/Q/T/ST)

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