lt3080-1 Linear Technology Corporation, lt3080-1 Datasheet - Page 7

• Manufacturer Part Number: lt3080-1
• Description: Parallelable 1.1a Adjustable Single Resistor Low Dropout Regulator
• Manufacturer: Linear Technology Corporation

TYPICAL PERFORMANCE CHARACTERISTICS
PI FU CTIO S
V
control circuitry of the device. The current fl ow 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 specifi ca-
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 specifi cations).
NC (Pin 6/Pin 6): No Connection. No Connect pins have
no connection to internal circuitry and may be tied to V
V
CONTROL
CONTROL
U
100μV/DIV
, V
(Pin 5/Pin 5): This pin is the supply pin for the
U
V
OUT
OUT
Output Voltage Noise
, GND, or fl oated.
V
R
C
C
I
LOAD
OUT
SET
OUT
SET
= O.1μF
= 100k
= 1V
= 10μF
= 1.1A
U
TIME 1ms/DIV
(DD/MS8E)
30801 G27
IN
,
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-
plifi er and the regulation set point for the device. A fi xed
current of 10μA fl ows 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.
–10
–15
–20
–25
–30
20
15
10
–5
5
0
10
Error Amplifi er Gain and Phase
100
FREQUENCY (Hz)
1k
10k
I
I
L
L
= 100mA
= 100mA
I
I
L
100k
L
= 1.1A
= 1.1A
30801 G28
LT3080-1
1M
300
250
200
150
100
50
0
–50
–100
–150
–200
30801f
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