3021 データシートの表示（PDF） - Linear Technology
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3021 Datasheet PDF : 16 Pages
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LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
TYPICAL PERFOR A CE CHARACTERISTICS
Input Ripple Rejection
70
60
50
COUT = 22µF
40
30
COUT = 4.7µF
20
10 VIN = 1.5V + 50mVRMS RIPPLE
VOUT = 0.5V
0 IL = 500mA
10
100
1k
10k
FREQUENCY (Hz)
100k 1M
3021 G14
Input Ripple Rejection
100
90
80
70
60
50
40
30
20 VIN = 1.5V + 0.5VP-P RIPPLE AT 120Hz
10 VOUT = 0.5V
IL = 500mA
0
–50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
3021 G15
Load Regulation
∆IL = 1mA to 500mA
2.5
2.0
1.5
1.0
0.5
0
–0.5
–1.0 VIN = 1.15V
–1.5 VOUT = 0.5V
*LOAD REGULATION NUMBER REFERS
–2.0 TO CHANGE IN THE 200mV REFERENCE
VOLTAGE
–2.5
–50 –25 0
25 50 75 100 125
TEMPERATURE (°C)
3021 G17
No-Load Recovery Threshold
18
16
14
12
10
8
6
4
2
0
0
5
10
15
20
OUTPUT OVERSHOOT (%)
3021 G20
Output Noise Spectral Density
10
VOUT = 1.2V
IL = 500mA
COUT = 4.7µF
1
0.1
0.01
10
100
1k
10k 100k 1M
FREQUENCY (Hz)
3021 G18
RMS Output Noise vs Load
Current (10Hz to 100kHz)
300 VOUT = 1.2V
COUT = 4.7µF
250
200
Transient Response
VOUT
50mV/DIV
150
IOUT
500mA/DIV
100
50
0
0.01
0.1
1
10
LOAD CURRENT (mA)
100
3021 G19
50µs/DIV
IOUT = 50mA TO 500mA
VIN = 1.5V
VOUT = 1.2V
COUT = 22µF
3021 G21
3021fa
7
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