Datasheet

LT3042
11
3042fb
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Noise Spectral Density as
a Function of Error Amplifier
Input Pair
OUTPUT NOISE (nV/√Hz)
1000
1
100
10
0.1
3042 G52
FREQUENCY (Hz)
10 100 1k 1M
10M
100k10k
V
IN
= V
OUT
+ 2V
I
L
= 200mA
C
OUT
= 4.7µF
C
SET
= 4.7µF
V
OUT
≥ 1.3V
0.6V < V
OUT
< 1.3V
V
OUT
≤ 0.6V
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.
5µV/DIV
1ms/DIV
3042 G53
V
IN
= 5V
R
SET
= 33.2kΩ
C
OUT
= 4.7µF
C
SET
= 4.7µF
I
L
= 200mA
200mA/DIV
10mV/DIV
20µs/DIV
3042 G54
V
IN
= 5V
R
SET
= 33.2kΩ
C
OUT
= 4.7µF
C
SET
= 0.47µF
LOAD STEP = 10mA TO 200mA
LOAD STEP
OUTPUT VOLTAGE
500mV/DIV
1mV/DIV
5µs/DIV
3042 G55
V
IN
= 4V TO 4.5V
R
SET
= 33.2kΩ
C
OUT
= 4.7µF
C
SET
= 0.47µF
I
L
= 200mA
OUTPUT VOLTAGE
INPUT VOLTAGE
500mV/DIV
2V/DIV
100ms/DIV
3042 G56
V
IN
= 5V
R
SET
= 33.2kΩ
C
OUT
= 4.7µF
C
SET
= 4.7µF
R
L
= 16.5Ω
PULSE EN/UV
OUTPUT WITH
FAST START-UP
(SET AT 95%)
OUTPUT WITHOUT
FAST START-UP
2V/DIV
50ms/DIV
3042 G57
V
IN
= 0V TO 5V
R
SET
= 33.2kΩ
C
OUT
= 4.7µF
C
SET
= 0.47µF
R
L
= 16.5Ω
OUTPUT VOLTAGE
INPUT VOLTAGE
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