LT3080 Ver la hoja de datos (PDF) - Linear Technology
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LT3080 Datasheet PDF : 26 Pages
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TYPICAL PERFORMANCE CHARACTERISTICS
LT3080
Output Voltage Noise
VOUT
100μV/DIV
VOUT = 1V
RSET = 100k
CSET = O.1μF
COUT = 10μF
ILOAD = 1.1A
TIME 1ms/DIV
3080 G26
Error Amplifier Gain and Phase
20
300
15
250
10
200
5
IL = 1.1A 150
0
100
–5
IL = 100mA
50
–10
IL = 1.1A 0
–15
–50
IL = 100mA
–20
–100
–25
–150
–30
10
100 1k 10k 100k
FREQUENCY (Hz)
–200
1M
3080 G28
PIN FUNCTIONS (DD/MS8E/Q/T/ST)
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.
3080fb
7
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