Datasheet

7
LT1521/LT1521-3
LT1521-3.3/LT1521-5
1521335fb
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Current Limit
TEMPERATURE (°C)
–50
SHORT-CIRCUIT CURRENT (A)
0.6
0.5
0.4
0.3
0.2
0.1
0
25 75
LT1521 • TPC28
–25 0
50 100 125
V
IN
= 7V
V
OUT
= 0V
Current Limit
Adjust Pin Bias Current
TEMPERATURE (°C)
–50
ADJUST PIN BIAS CURRENT (nA)
25
LT1521 • TPC25
–25 0 50
200
175
150
125
100
75
50
25
0
75 100 125
Reverse Output Current
OUTPUT VOLTAGE (V)
0
REVERSE OUTPUT CURRENT (µA)
50
45
40
35
30
25
20
15
10
5
0
8
LT1521 • TPC26
3579
4
6
10
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
LT1521-3.3
LT1521-3
LT1521-5
21
TEMPERATURE (°C)
–50
OUTPUT PIN CURRENT (µA)
25
LT1521 • TPC29
–25 0 50
8
7
6
5
4
3
2
1
0
75 100 125
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)
Reverse Output Current Ripple Rejection
TEMPERATURE (°C)
–50
66
64
62
60
58
56
54
52
25 75
LT1521 • TPC30
–25 0
50 100 125
RIPPLE REJECITON (dB)
V
IN
= V
OUT
(NOMINAL) + 1V + 0.5V
P-P
RIPPLE AT f = 120Hz
I
LOAD
= 150mA
INPUT VOLTAGE (V)
0
SHORT-CIRCUIT CURRENT (A)
0.6
0.5
0.4
0.3
0.2
0.1
0
35
LT1521 • TPC27
12
467
V
OUT
= 0V
Shutdown Pin Threshold
(Off-to-On)
TEMPERATURE (°C)
–50
SHUTDOWN PIN CURRENT (µA)
3.0
2.5
2.0
1.5
1.0
0.5
0
25 75
LT1521 • TPC23
–25 0
50 100 125
V
SHDN
= 0V
TEMPERATURE (°C)
–50
SHUTDOWN PIN THRESHOLD (V)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
50
75
LT1521 • TPC22
–25
25
100
125
I
LOAD
= 1mA
I
LOAD
= 300mA
Shutdown Pin Current
Shutdown Pin Input Current
SHUTDOWN PIN VOLTAGE (V)
0
SHUTDOWN PIN INPUT CURRENT (mA)
25
20
15
10
5
0
2
4
59
LT1521 • TPC24
13
6
7
8