Datasheet

LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
8
3021fc
TYPICAL PERFORMANCE CHARACTERISTICS
Input Ripple Rejection Input Ripple Rejection
Load Regulation
ΔI
L
= 1mA to 500mA
No-Load Recovery Threshold Output Noise Spectral Density
RMS Output Noise vs Load
Current (10Hz to 100kHz) Transient Response
FREQUENCY (Hz)
10
INPUT RIPPLE REJECTION (dB)
20
30
60
50
40
70
10 1k 10k 1M
3021 G14
0
100
100k
V
IN
= 1.5V + 50mV
RMS
RIPPLE
V
OUT
= 0.5V
I
L
= 500mA
C
OUT
= 4.7μF
C
OUT
= 22μF
TEMPERATURE (°C)
–50
INPUT RIPPLE REJECTION (dB)
100
90
80
60
70
50
40
30
20
10
0
3021 G15
250–25 50 75
125100
V
IN
= 1.5V + 0.5V
P-P
RIPPLE AT 120Hz
V
OUT
= 0.5V
I
L
= 500mA
TEMPERATURE (°C)
–50
LOAD REGULATION (mV)
2.5
2.0
1.5
0.5
1.0
0
–0.5
–1.0
–1.5
–2.0
–2.5
3021 G17
250–25 50 75
125100
V
IN
= 1.15V
V
OUT
= 0.5V
*LOAD REGULATION NUMBER REFERS
TO CHANGE IN THE 200mV REFERENCE
VOLTAGE
OUTPUT OVERSHOOT (%)
0
OUTPUT SINK CURRENT (mA)
18
16
12
14
10
8
6
4
2
0
3021 G20
15105
20
FREQUENCY (Hz)
10
OUTPUT NOISE SPECTRAL DENSITY (μV/√Hz)
10
1
0.1
0.01
1k 100k 1M100 10k
3021 G18
V
OUT
= 1.2V
I
L
= 500mA
C
OUT
= 4.7μF
LOAD CURRENT (mA)
OUTPUT NOISE (μV
RMS
)
300
250
200
150
100
50
0
0.01 1 10 100
3021 G19
0.1
V
OUT
= 1.2V
C
OUT
= 4.7μF
50μs/DIV
I
OUT
= 50mA TO 500mA
V
IN
= 1.5V
V
OUT
= 1.2V
C
OUT
= 22μF
3021 G21
V
OUT
50mV/DIV
I
OUT
500mA/DIV
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