Datasheet

LT3055
8
3055f
For more information www.linear.com/LT3055
RMS Output Noise vs C
REF/BYP
,
V
OUT
= 0.6V, C
FF
= 0
RMS Output Noise vs Load
Current, C
REF/BYP
= 10nF, C
FF
= 0
RMS Output Noise
vs Feedforward Capacitor (C
FF
)
Start-Up Time
vs REF/BYP Capacitor
10Hz to 100kHz Output Noise
C
REF/BYP
= 10nF, C
FF
= 0
10Hz to 100kHz Output Noise
C
REF/BYP
= 10nF, C
FF
= 10nF
5V Transient Response
C
FF
= 0, I
OUT
= 50mA to 500mA
5V Transient Response
C
FF
= 10nF, I
OUT
= 10mA to 500mA Transient Response (Load Dump)
TYPICAL PERFORMANCE CHARACTERISTICS
T
J
= 25°C, unless otherwise noted.
LOAD CURRENT (mA)
0.01
40
OUTPUT NOISE VOLTAGE (µV
RMS
)
50
60
70
80
0.1 1 10 100 1000
3055 G28
30
20
10
0
90
110
C
REF/BYP
= 0pF
C
REF/BYP
= 100pF
C
REF/BYP
= 1nF
C
REF/BYP
= 10nF
100
f = 10Hz TO 100kHz
C
OUT
= 10µF
LOAD CURRENT (mA)
0.01
100
OUTPUT NOISE VOLTAGE (µV
RMS
)
110
120
130
140
0.1 1 10 100 1000
3055 G29
30
40
50
60
70
80
90
20
10
0
150
160
V
OUT
= 5V
V
OUT
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.2V
V
OUT
= 0.6V
f = 10Hz TO 100kHz
C
OUT
= 10µF
FEEDFORWARD CAPACITOR, C
FF
(F)
20
OUTPUT NOISE VOLTAGE (µV
RMS
)
40
60
80
100
0.01 1 10
3055 G30
0
0.1
120
10
30
50
70
90
110
f = 10Hz TO 100kHz
C
REF/BYP
= 10nF
C
OUT
= 10µF
I
FB-DIVIDER
= 10µA
I
LOAD
= 500mA
V
OUT
= 5V
V
OUT
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.2V
V
OUT
= 0.6V
REF/BYP CAPACITOR (nF)
0
START-UP TIME (ms)
20
40
60
10
30
50
20 40 60 80
3055 G31
100100 30 50 70 90
V
OUT
100µV/DIV
1ms/DIVC
OUT
= 10µF
I
LOAD
= 500mA
V
OUT
= 5V
3055 G32
V
OUT
100µV/DIV
1ms/DIVC
OUT
= 10µF
I
LOAD
= 500mA
V
OUT
= 5V
3055 G33
V
OUT
200mV/DIV
I
OUT
500mA/DIV
100µs/DIVV
IN
= 6V
C
OUT
= C
IN
= 10µF
I
FB-DIVIDER
= 10µA
V
OUT
= 5V
3055 G34
V
OUT
100mV/DIV
I
OUT
500mA/DIV
20µs/DIVV
IN
= 6V
C
OUT
= C
IN
= 10µF
I
FB-DIVIDER
= 10µA
V
OUT
= 5V
3055 G35
V
OUT
20mV/DIV
V
IN
10V/DIV
1ms/DIVV
OUT
= 5V
I
OUT
= 100mA
C
OUT
= 10µF
3055 G36