Datasheet
LT3042
10
3042fb
For more information www.linear.com/LT3042
TYPICAL PERFORMANCE CHARACTERISTICS
Integrated RMS Output Noise
(10Hz to 100kHz)
Noise Spectral Density
Integrated RMS Output Noise
(10Hz to 100kHz)
Noise Spectral Density
Integrated RMS Output Noise
(10Hz to 100kHz)
Noise Spectral Density
T
J
= 25°C, unless otherwise noted.
Power Supply Ripple Rejection
Power Supply Ripple Rejection
as a Function of Error Amplifier
Input Pair
Power Supply Ripple Rejection
PSRR (dB)
120
110
70
80
50
30
100
90
60
40
20
3042 G43
FREQUENCY (Hz)
10 100 1k 1M
10M
100k10k
V
IN
= 5V
R
SET
= 33.2kΩ
C
OUT
= 4.7µF
C
SET
= 0.47µF
I
L
= 200mA
I
L
= 100mA
I
L
= 50mA
I
L
= 1mA
0 100 18060 140
200
80 16040 12020
RMS OUTPUT NOISE (µV
RMS
)
2.0
0.2
1.8
1.4
1.0
0.6
1.6
1.2
0.8
0.4
0
3042 G46
LOAD CURRENT (mA)
V
IN
= 5V
R
SET
= 33.2kΩ
C
OUT
= 4.7µF
C
SET
= 4.7µF
OUTPUT NOISE (nV/√Hz)
100
1
10
0.1
3042 G50
FREQUENCY (Hz)
10 100 1k 1M
10M
100k10k
V
IN
= 5V
R
SET
= 33.2kΩ
C
SET
= 4.7µF
I
L
= 200mA
C
OUT
= 4.7µF
C
OUT
= 22µF
PSRR (dB)
120
110
70
80
50
30
100
90
60
40
20
3042 G44
FREQUENCY (Hz)
10 100 1k 1M
10M
100k10k
V
IN
= V
OUT
+ 2V
I
L
= 200mA
C
OUT
= 4.7µF
C
SET
= 0.47µF
V
OUT
≥ 1.3V
0.6V < V
OUT
< 1.3V
V
OUT
≤ 0.6V
10
100
10.10.01
RMS OUTPUT NOISE (µV
RMS
)
9
8
6
4
2
7
5
3
1
0
3042 G47
SET PIN CAPACITANCE (µF)
V
IN
= 5V
R
SET
= 33.2kΩ
C
OUT
= 4.7µF
I
L
= 200mA
OUTPUT NOISE (nV/√Hz)
100
1
10
0.1
3042 G51
FREQUENCY (Hz)
10 100 1k 1M
10M
100k10k
V
IN
= 5V
R
SET
= 33.2kΩ
C
SET
= 4.7µF
C
OUT
= 4.7µF
I
L
= 200mA
I
L
= 100mA
I
L
= 50mA
I
L
= 1mA
INPUT-TO-OUTPUT DIFFERENTIAL (V)
PSRR (dB)
100
70
80
50
30
90
60
40
0
10
20
3042 G45
0 1 2
5
43
I
L
= 200mA
R
SET
= 33.2kΩ
C
OUT
= 4.7µF
C
SET
= 0.47µF
100kHz
500kHz
1MHz
2MHz
RMS OUTPUT NOISE (µV
RMS
)
2.0
0.2
1.8
1.4
1.0
0.6
1.6
1.2
0.8
0.4
0
OUTPUT VOLTAGE (V)
0 7.5 13.54.5 10.5
3042 G48
156 123 91.5
V
IN
= V
OUT
+ 2V
C
SET
= 4.7µF
C
OUT
= 4.7µF
I
LOAD
= 200mA
OUTPUT NOISE (nV/√Hz)
1000
1
100
10
0.1
3042 G49
FREQUENCY (Hz)
10 100 1k 1M
10M
100k10k
V
IN
= 5V
R
SET
= 33.2kΩ
C
OUT
= 4.7µF
I
L
= 200mA
C
SET
= 0.047µF
C
SET
= 0.47µF
C
SET
= 1µF
C
SET
= 4.7µF
C
SET
= 22µF
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