Datasheet
LT3050 Series
9
3050fa
Output Noise Spectral Density
C
REF/BYP
= 0, C
FF
= 0
Output Noise Spectral Density
vs C
REF/BYP
, C
FF
= 0
RMS Output Noise vs Load
Current vs C
REF/BYP
RMS Output Noise vs Load
Current C
REF/BYP
= 10nF
LOAD CURRENT (mA)
0.01
0
OUTPUT NOISE VOLTAGE (µV
RMS
)
40
30
20
10
110
100
90
80
70
60
50
101 100
3050 G24
0.1
V
OUT
= 0.6V
C
OUT
= 10µF
C
REF/BYP
= 0
C
REF/BYP
= 10pF
C
REF/BYP
= 100pF
C
REF/BYP
= 1nF
C
REF/BYP
= 10nF
C
REF/BYP
= 100nF
LOAD CURRENT (mA)
0.01
0
OUTPUT NOISE VOLTAGE (µV
RMS
)
50
40
30
20
10
170
120
130
140
150
160
110
100
90
80
70
60
101 100
3050 G25
0.1
V
OUT
= 5V
V
OUT
= 3.3V
V
OUT
= 1.2V
V
OUT
= 2.5V
V
OUT
= 1.8V
V
OUT
= 1.5V
V
OUT
= 0.6V
f
OUT
= 10Hz TO 100kHz
C
OUT
= 10µF
FREQUENCY (Hz)
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
10
1
3050 G22
0.01
0.1
10 100 1K 10K 100k
I
L
= 100mA
C
OUT
= 10µF
V
OUT
= 1.5V
V
OUT
= 1.2V
V
OUT
= 0.6V
V
OUT
= 1.8V
V
OUT
= 2.5V
V
OUT
= 3.3V
V
OUT
= 5V
FREQUENCY (Hz)
10
0.01
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
1
0.1
10
10k1k 100k
3050 G23
100
V
OUT
= 5V
C
REF/BYP
= 10nF
C
REF/BYP
= 1nF
V
OUT
= 0.6V
C
OUT
= 10µF
I
L
= 100mA
C
REF/BYP
= 100pF
Startup Time
vs REF/BYP Capacitor
REF/BYP CAPACITOR (nF)
STARTUP TIME (ms)
60
50
40
30
3050 G33
0
10
20
0 102030405060708090100
TYPICAL PERFORMANCE CHARACTERISTICS
T
J
= 25°C, unless otherwise noted.
5V 10Hz to 100kHz Output Noise
C
REF/BYP
= 10nF, C
FF
= 0
1ms/DIVC
OUT
= 10µF
I
LOAD
= 100mA
V
OUT
100µV/DIV
3050 G27
1ms/DIVC
OUT
= 10µF
I
LOAD
= 100mA
V
OUT
100µV/DIV
3050 G26
Output Noise Spectral Density
vs C
FF
, C
REF/BYP
= 10nF
RMS Output Noise
vs Feedforward Capacitor (C
FF
)
FREQUENCY (Hz)
10
0.01
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
1
0.1
10
10k1k 100k
3050 G23a
100
C
FF
= 0
C
FF
= 100pF
C
FF
= 10nF
V
OUT
= 5V
C
OUT
= 10µF
I
L
= 100mA
C
FF
= 1nF
FEEDFORWARD CAPACITOR, C
FF
(F)
10p
0
OUTPUT NOISE VOLTAGE (µV
RMS
)
10
120
70
80
90
100
110
60
50
40
30
20
1n 10n
3050 G25a
100p
f = 10Hz TO 100kHz
C
REF/BYP
= 10nF
C
OUT
= 10µF
I
FB-DIVIDER
= 5µA
I
L
= 100mA
V
OUT
= 0.6V
V
OUT
= 5V
V
OUT
= 1.8V
V
OUT
= 1.5V
V
OUT
= 1.2V
V
OUT
= 2.5V
V
OUT
= 3.3V
5V 10Hz to 100kHz Output Noise
C
REF/BYP
= 10nF, C
FF
= 10nF