Datasheet

LT3045
11
Rev. B
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Noise Spectral Density as
a Function of Error Amplifier
Input Pair
TYPICAL PERFORMANCE CHARACTERISTICS
Start-Up Time with and
without Fast Start-Up Circuitry for
Large C
SET
Input Supply Ramp-Up and
Ramp-Down
Output Noise: 10Hz to 100kHz Load Transient Response
Line Transient Response
T
J
= 25°C, unless otherwise noted.
V
IN
= V
OUT
+ 2V
I
L
= 500mA
C
OUT
= 10µF
C
SET
= 4.7µF
V
OUT
≥ 1.3V
0.6V < V
OUT
< 1.3V
V
OUT
≤ 0.6V
FREQUENCY (Hz)
10
100
1k
10k
100k
1M
10M
0.1
1
10
100
1000
OUTPUT NOISE (nV/√Hz)
3045 G52
V
IN
= 5V
R
SET
= 33.2k
C
OUT
= 10µF
C
SET
= 4.7µF
I
L
= 500mA
1ms/DIV
5µV/DIV
3042 G53
V
IN
= 5V
R
SET
= 33.2k
C
OUT
= 10µF
C
SET
= 0.47µF
LOAD STEP = 10mA TO 500mA
20µs/DIV
OUTPUT
CURRENT
500mA/DIV
OUTPUT
VOLTAGE
20mV/DIV
3042 G54
V
IN
= 4.5V TO 5V
R
SET
= 33.2k
C
OUT
= 10µF
C
SET
= 0.47µF
I
L
= 500mA
5µs/DIV
INPUT
VOLTAGE
500mV/DIV
OUTPUT
VOLTAGE
1mV/DIV
3042 G55
V
IN
= 5V
R
SET
= 33.2k
C
OUT
= 10µF
C
SET
= 4.7µF
R
L
= 6.6Ω
500mV/DIV
2V/DIV
OUTPUT WITH
FAST START–UP
(SET AT 90%)
OUTPUT WITHOUT
FAST START–UP
PULSE EN/UV
100ms/DIV
3042 G56
INPUT VOLTAGE
OUTPUT VOLTAGE
V
IN
= 0V TO 5V
V
EN/UV
= V
IN
R
SET
= 33.2k
C
OUT
= 10µF
C
SET
= 0.47µF
R
L
= 6.6Ω
50ms/DIV
2V/DIV
3042 G57
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