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