Datasheet

LT3080-1
7
30801fb
Output Voltage Noise
Error Amplifier Gain and Phase
FREQUENCY (Hz)
–30
GAIN (dB)
PHASE (DEGREES)
–10
20
10k 100k10010 1k 1M
30801 G28
–20
0
10
–15
15
–25
–5
5
–200
0
300
–100
100
200
–50
250
–150
50
150
I
L
= 1.1A
I
L
= 100mA
I
L
= 100mA
I
L
= 1.1A
V
CONTROL
(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 specifica-
tions).
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 V
IN
,
V
CONTROL
, V
OUT
, 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 am-
plifier 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)
V
OUT
100µV/DIV
TIME 1ms/DIV
30801 G27
V
OUT
= 1V
R
SET
= 100k
C
SET
= O.1µF
C
OUT
= 10µF
I
LOAD
= 1.1A
Typical perFormance characTerisTics
pin FuncTions