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LT1521 Datasheet(PDF) 7 Page - Linear Technology

Part # LT1521
Description  300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1521 Datasheet(HTML) 7 Page - Linear Technology

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7
LT1521/LT1521-3
LT1521-3.3/LT1521-5
1521335fb
TYPICAL PERFORMANCE CHARACTERISTICS
Current Limit
TEMPERATURE (
°C)
–50
0.6
0.5
0.4
0.3
0.2
0.1
0
25
75
LT1521 • TPC28
–25
0
50
100
125
VIN = 7V
VOUT = 0V
Current Limit
Adjust Pin Bias Current
TEMPERATURE (
°C)
–50
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
50
45
40
35
30
25
20
15
10
5
0
8
LT1521 • TPC26
35
79
4
6
10
TJ = 25°C
VIN = 0V
CURRENT FLOWS
INTO OUTPUT PIN
VOUT = VSENSE
(LT1521-3/LT1521-3.3
LT1521-5)
VOUT = VADJ (LT1521)
LT1521
LT1521-3.3
LT1521-3
LT1521-5
2
1
TEMPERATURE (
°C)
–50
25
LT1521 • TPC29
–25
0
50
8
7
6
5
4
3
2
1
0
75
100
125
VIN = 0V
VOUT = 3V (LT1521-3)
VOUT = 3.3V (LT1521-3.3)
VOUT = 5V (LT1521-5)
VOUT = 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
VIN = VOUT (NOMINAL) + 1V + 0.5VP-P
RIPPLE AT f = 120Hz
ILOAD = 150mA
INPUT VOLTAGE (V)
0
0.6
0.5
0.4
0.3
0.2
0.1
0
35
LT1521 • TPC27
12
46
7
VOUT = 0V
Shutdown Pin Threshold
(Off-to-On)
TEMPERATURE (
°C)
–50
3.0
2.5
2.0
1.5
1.0
0.5
0
25
75
LT1521 • TPC23
–25
0
50
100
125
VSHDN = 0V
TEMPERATURE (
°C)
–50
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
ILOAD = 1mA
ILOAD = 300mA
Shutdown Pin Current
Shutdown Pin Input Current
SHUTDOWN PIN VOLTAGE (V)
0
25
20
15
10
5
0
2
4
59
LT1521 • TPC24
13
6
7
8


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