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LT3080-1

30801fa

Output Voltage Noise

Error Ampliﬁer Gain and Phase

FREQUENCY (Hz)

–30

–10

10k

100k

100

30801 G28

–20

–15

–25

–5

–200

300

–100

100

200

–50

250

–150

150

IL = 1.1A

IL = 100mA

IL = 1.1A

VCONTROL (Pin 5/Pin 5): This pin is the supply pin for

the control circuitry of the device. The current 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): This is the collector to the power

device of the LT3080-1. 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): No Connection. No Connect 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): 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): 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): OUT on MS8E and DFN

packages.

(DD/MS8E)

VOUT

100μV/DIV

TIME 1ms/DIV

30801 G27

VOUT = 1V

RSET = 100k

CSET = O.1μF

COUT = 10μF

ILOAD = 1.1A

TYPICAL PERFORMANCE CHARACTERISTICS

PIN FUNCTIONS

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