LT1521/LT1521-3
LT1521-3.3/LT1521-5
TYPICAL PERFORMANCE CHARACTERISTICS
LT1521-3
Ground Pin Current
8
7
GROUND PIN CURRENT (mA)
6
5
4
3
2
1
0
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
R
LOAD
= 30Ω
I
LOAD
= 100mA*
R
LOAD
= 20Ω
I
LOAD
= 150mA*
R
LOAD
= 10Ω
I
LOAD
= 300mA*
T
J
= 25°C
*FOR V
OUT
= 3V
1000
900
T
J
= 25°C
*FOR V
OUT
= 3.3V
R
LOAD
= 66Ω
I
LOAD
= 50mA*
R
LOAD
= 132Ω
I
LOAD
= 25mA*
R
LOAD
= 330Ω
I
LOAD
= 10mA*
R
LOAD
= 3.3k
I
LOAD
= 1mA*
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
GROUND PIN CURRENT (mA)
GROUND PIN CURRENT (µA)
LT1521-5
Ground Pin Current
1000
900
T
J
= 25°C
*FOR V
OUT
= 5V
R
LOAD
= 100Ω
I
LOAD
= 50mA*
8
7
GROUND PIN CURRENT (mA)
GROUND PIN CURRENT (µA)
GROUND PIN CURRENT (µA)
800
700
600
500
400
300
200
100
0
0
1
2
R
LOAD
= 200Ω
I
LOAD
= 25mA*
R
LOAD
= 500Ω
I
LOAD
= 10mA*
R
LOAD
= 5k
I
LOAD
= 1mA*
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
LT1521
Ground Pin Current
8
7
GROUND PIN CURRENT (mA)
6
5
4
3
2
1
0
0
1
2
R
LOAD
= 37.5Ω
I
LOAD
=100mA*
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
R
LOAD
= 25Ω
I
LOAD
=150mA*
T
J
= 25°C
V
OUT
= V
ADJ
*FOR V
OUT
= 3.75V
R
LOAD
= 12.5Ω
I
LOAD
=300mA*
GROUND PIN CURRENT (mA)
8
7
6
5
4
3
2
1
0
0
T
J
= 125°C
SHUTDOWN PIN THRESHOLD (V)
6
U W
LT1521 • TPC13
LT1521 • TPC16
LT1521 • TPC19
LT1521-3.3
Ground Pin Current
8
7
6
5
4
3
2
1
0
LT1521-3.3
Ground Pin Current
T
J
= 25°C
*FOR V
OUT
= 3.3V
R
LOAD
= 11Ω
I
LOAD
= 300mA*
800
700
600
500
400
300
200
100
0
R
LOAD
= 22Ω
I
LOAD
= 150mA*
R
LOAD
= 33Ω
I
LOAD
= 100mA*
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
LT1521 • TPC14
LT1521 • TPC15
LT1521-5
Ground Pin Current
1000
T
J
= 25°C
*FOR V
OUT
= 5V
R
LOAD
= 16.7Ω
I
LOAD
= 300mA*
900
800
700
600
500
400
300
200
100
0
8
9
10
LT1521
Ground Pin Current
T
J
= 25°C
V
OUT
= V
ADJ
*FOR V
OUT
= 3.75V
R
LOAD
= 75Ω
I
LOAD
= 50mA*
R
LOAD
= 150Ω
I
LOAD
= 25mA*
R
LOAD
= 375Ω
I
LOAD
= 10mA*
R
LOAD
= 3.8k
I
LOAD
= 1mA*
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
6
5
4
3
2
1
0
0
1
2
R
LOAD
= 50Ω
I
LOAD
= 100mA*
3 4 5 6 7
INPUT VOLTAGE (V)
R
LOAD
= 33.3Ω
I
LOAD
= 150mA*
LT1521 • TPC17
LT1521 • TPC18
Ground Pin Current
10
9
V
IN
= 3V (LT1521-3)
V
IN
= 3.3V (LT1521-3.3)
V
IN
= 5V (LT1521-5)
V
IN
= 3.75V (LT1521)
DEVICE IS OPERATING
IN DROPOUT
T
J
= 25°C
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
Shutdown Pin Threshold
(On-to-Off)
I
LOAD
= 1mA
T
J
= 55°C
50
250
150
200
100
OUTPUT CURRENT (mA)
300
0
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
LT1521 • TPC20
LT1521 • TPC21
LINER [ LINEAR TECHNOLOGY ]
