Datasheet
8
LT3028
3028f
Channel-to-Channel Isolation Output 2 Load Regulation
TYPICAL PERFOR A CE CHARACTERISTICS
UW
TEMPERATURE (°C)
–50
LOAD REGULATION (mV)
0
–1
–2
–3
–4
–5
–6
–7
–8
–9
–10
05075
3028 G35
–25 25 100 125
∆I
L
= 1mA TO 100mA
Output Noise Spectral Density Output Noise Spectral Density
RMS Output Noise
vs Bypass Capacitor
Output 2
RMS Output Noise vs Load
Current (10Hz to 100kHz)
LOAD CURRENT (mA)
0.01
OUTPUT NOISE (µV
RMS
)
160
140
120
100
80
60
40
20
0
0.1 1 10010
3028 G40
V
OUT2
SET FOR 5V
V
OUT2
SET FOR 5V
V
OUT2
=V
ADJ2
V
OUT2
=V
ADJ2
C
OUT2
= 10µF
T
J
= 25°C
C
BYP
= 0
C
BYP
= 0.01µF
Output 1
RMS Output Noise vs Load
Current (10Hz to 100kHz)
Output 1 Load Regulation
TEMPERATURE (°C)
–50
LOAD REGULATION (mV)
100
3028 G36
050–25 25 75 125
5
0
–5
–10
∆I
L
= 1mA TO 500mA
FREQUENCY (kHz)
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
0.01 1 10 100
3028 G37
0.1
10
1
0.1
0.01
V
OUT
SET FOR 5V
V
OUT
=V
ADJ
C
OUT
= 10µF
C
BYP
= 0
I
L
= FULL LOAD
T
J
= 25°C
FREQUENCY (kHz)
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
0.01 1 10 100
3028 G38
0.1
10
1
0.1
0.01
V
OUT
SET FOR 5V
V
OUT
=V
ADJ
C
OUT
= 10µF
I
L
= FULL LOAD
T
J
= 25°C
C
BYP
= 1000pF
C
BYP
= 100pF
C
BYP
= 0.01µF
LOAD CURRENT (mA)
0.01
OUTPUT NOISE (µV
RMS
)
160
140
120
100
80
60
40
20
0
0.1 1
3028 G41
10 100 1000
C
OUT1
= 10µF
T
J
= 25°C
V
OUT1
SET FOR 5V
V
OUT1
SET FOR 5V
V
OUT1
= V
ADJ1
V
OUT1
= V
ADJ1
C
BYP
= 0
C
BYP
= 0.01µF
FREQUENCY (Hz)
10
40
CHANNEL-TO-CHANNEL ISOLATION (dB)
50
60
70
80
100 1k 1M10k 100k
3028 G34
30
20
10
0
90
100
CHANNEL 2
GIVEN CHANNEL IS TESTED
WITH 50mVRMS SIGNAL ON
OPPOSING CHANNEL, BOTH
CHANNELS DELIVERING FULL
CURRENT
T
J
= 25°C
CHANNEL 1
C
BYP
(pF)
10
80
OUTPUT NOISE (µV
RMS
)
100
120
140
100 1000 10000
3028 G39
60
40
20
0
OUTPUT 2
OUTPUT 2
V
OUT
= 5V
V
OUT
= 1.22V
OUTPUT 1
OUTPUT 1
C
OUT
= 10µF
I
L
= FULL LOAD
f
BW
= 10Hz TO 100kHz
T
J
= 25°C
V
OUT1
20mV/DIV
V
OUT2
20mV/DIV
C
OUT1
= 22µF50µs/DIV 3028 G50
C
OUT2
= 10µF
C
BYP1
= C
BYP2
= 0.01µF
∆I
L1
= 50mA TO 500mA
∆I
L2
= 10mA TO 100mA
V
IN
= 6V, V
OUT1
= V
OUT2
= 5V
Channel-to-Channel Isolation