LT1521/LT1521-3
LT1521-3.3/LT1521-5
TYPICAL PERFORMANCE CHARACTERISTICS
Shutdown Pin Threshold
(Off-to-On)
2.0
1.8
SHUTDOWN PIN THRESHOLD (V)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–50 –25
SHUTDOWN PIN CURRENT (µA)
I
LOAD
= 300mA
2.5
2.0
1.5
1.0
0.5
0
–50 –25
SHUTDOWN PIN INPUT CURRENT (mA)
100
125
I
LOAD
= 1mA
50
0
75
25
TEMPERATURE (°C)
Adjust Pin Bias Current
200
REVERSE OUTPUT CURRENT (µA)
ADJUST PIN BIAS CURRENT (nA)
175
150
125
100
75
50
25
0
–50 –25
0
75
50
25
TEMPERATURE (°C)
100
125
40
35
30
25
20
15
10
5
0
0
SHORT-CIRCUIT CURRENT (A)
Current Limit
0.6
0.5
0.4
0.3
0.2
0.1
0
–50 –25
V
IN
= 7V
V
OUT
= 0V
OUTPUT PIN CURRENT (µA)
8
7
6
5
4
3
2
1
50
25
75
0
TEMPERATURE (°C)
100
125
SHORT-CIRCUIT CURRENT (A)
RIPPLE REJECITON (dB)
U W
100
LT1521 • TPC22
Shutdown Pin Current
3.0
V
SHDN
= 0V
25
Shutdown Pin Input Current
20
15
10
5
125
50
25
75
0
TEMPERATURE (°C)
0
0
1
7
3
8
2
5
6
4
SHUTDOWN PIN VOLTAGE (V)
9
LT1521 • TPC23
LT1521 • TPC24
Reverse Output Current
50
45
T
J
= 25°C
V
IN
= 0V
CURRENT FLOWS
INTO OUTPUT PIN
V
OUT
= V
SENSE
(LT1521-3/LT1521-3.3
LT1521-5)
V
OUT
= V
ADJ
(LT1521)
LT1521-3.3
LT1521-3
LT1521-5
1
2
3 4 5 6 7 8
OUTPUT VOLTAGE (V)
9
10
0.6
Current Limit
V
OUT
= 0V
0.5
0.4
0.3
0.2
0.1
0
LT1521
0
1
4
3
5
2
INPUT VOLTAGE (V)
6
7
LT1521 • TPC25
LT1521 • TPC26
LT1521 • TPC27
Reverse Output Current
66
V
IN
= 0V
V
OUT
= 3V (LT1521-3)
V
OUT
= 3.3V (LT1521-3.3)
V
OUT
= 5V (LT1521-5)
V
OUT
= 3.75V (LT1521)
64
62
60
58
56
54
Ripple Rejection
V
IN
= V
OUT
(NOMINAL) + 1V + 0.5V
P-P
RIPPLE AT f = 120Hz
I
LOAD
= 150mA
0
–50
–25
0
75
50
25
TEMPERATURE (°C)
100
125
52
–50 –25
50
25
75
0
TEMPERATURE (°C)
100
125
LT1521 • TPC28
LT1521 • TPC29
LT1521
• TPC30
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LINER [ LINEAR TECHNOLOGY ]
