Datasheet
LT1121/LT1121-3.3/LT1121-5
6
1121fg
TYPICAL PERFORMANCE CHARACTERISTICS
LT1121-3.3
Ground Pin Current
LT1121-5
Ground Pin Current
LT1121
Ground Pin Current
INPUT VOLTAGE (V)
0
GROUND PIN CURRENT (μA)
800
700
600
500
400
300
200
100
0
8
1121 G11
2
4
6
10
1 3 5 7 9
T
J
= 25°C
R
LOAD
= 500Ω
I
LOAD
= 10mA*
R
LOAD
= 5k
I
LOAD
= 1mA*
R
LOAD
= 200Ω
I
LOAD
= 25mA*
*FOR V
OUT
= 5V
INPUT VOLTAGE (V)
0
GROUND PIN CURRENT (μA)
800
700
600
500
400
300
200
100
0
8
1121 G12
2
4
6
10
1 3 5 7 9
T
J
= 25°C
V
OUT
= V
ADJ
R
LOAD
= 150Ω
I
LOAD
= 25mA*
R
LOAD
= 380Ω
I
LOAD
= 10mA*
R
LOAD
= 3.8k
I
LOAD
= 1mA*
*FOR V
OUT
= 3.75V
INPUT VOLTAGE (V)
0
GROUND PIN CURRENT (μA)
800
700
600
500
400
300
200
100
0
8
1121 G10
2
4
6
10
1 3 5 7 9
R
LOAD
= 130Ω
I
LOAD
= 25mA*
R
LOAD
= 330Ω
I
LOAD
= 10mA*
R
LOAD
= 3.3k
I
LOAD
= 1mA*
T
J
= 25°C
*FOR V
OUT
= 3.3V
LT1121-3.3
Ground Pin Current
LT1121-5
Ground Pin Current
LT1121
Ground Pin Current
Ground Pin Current
Shutdown Pin Threshold
(On-to-Off)
Shutdown Pin Threshold
(Off-to-On)
INPUT VOLTAGE (V)
0
GROUND PIN CURRENT (mA)
10
9
8
7
6
5
4
3
2
1
0
8
1121 G14
2
4
6
10
1 3 5 7 9
T
J
= 25°C
R
LOAD
= 50Ω
I
LOAD
= 100mA*
R
LOAD
= 100Ω
I
LOAD
= 50mA*
R
LOAD
= 33Ω
I
LOAD
= 150mA*
*FOR V
OUT
= 5V
INPUT VOLTAGE (V)
0
GROUND PIN CURRENT (mA)
10
9
8
7
6
5
4
3
2
1
0
8
1121 G15
2
4
6
10
1 3 5 7 9
T
J
= 25°C
V
OUT
= V
ADJ
R
LOAD
= 25Ω
I
LOAD
= 150mA*
R
LOAD
= 38Ω
I
LOAD
= 100mA*
R
LOAD
= 75Ω
I
LOAD
= 50mA*
*FOR V
OUT
= 3.75V
INPUT VOLTAGE (V)
0
GROUND PIN CURRENT (mA)
10
9
8
7
6
5
4
3
2
1
0
8
1121 G13
2
4
6
10
1 3 5 7 9
T
J
= 25°C
R
LOAD
= 22Ω
I
LOAD
= 150mA*
R
LOAD
= 33Ω
I
LOAD
= 100mA*
R
LOAD
= 66Ω
I
LOAD
= 50mA*
*FOR V
OUT
= 3.3V
OUTPUT CURRENT (mA)
GROUND PIN CURRENT (mA)
14
12
10
8
6
4
2
0
40
80
120
1121 G16
20
60
140
160
0
100
T
J
= 125°C
T
J
= –55°C
T
J
= 25°C
V
IN
= 3.3V (LT1121-3.3)
V
IN
= 5V (LT1121-5)
V
IN
= 3.75V (LT1121)
DEVICE IS OPERATING
IN DROPOUT
TEMPERATURE (°C)
–50
SHUTDOWN 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
1121 G17
–25
25
100
125
I
LOAD
= 1mA
TEMPERATURE (°C)
–50
SHUTDOWN 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
1121 G18
–25
25
100
125
I
LOAD
= 1mA
I
LOAD
= 150mA