LT1129/LT1129-3.3/LT1129-5
TYPICAL PERFORMANCE CHARACTERISTICS
LT1129-3.3
Ground Pin Current
LT1129-5
Ground Pin Current
LT1129
Ground Pin Current
60
50
40
30
20
10
0
60
50
40
30
20
10
0
60
50
40
30
20
10
0
T = 25°C
J
OUT
T = 25°C
J
OUT
T = 25°C
J
OUT
V
= V
SENSE
V
= V
ADJ
V
= V
SENSE
R
LOAD
= 5.3Ω
LOAD
R
LOAD
= 7.1Ω
I
= 700mA*
LOAD
R
LOAD
= 4.7Ω
I
I
= 700mA*
LOAD
I
= 700mA*
R
LOAD
= 10Ω
= 500mA*
LOAD
R
LOAD
= 7.5Ω
= 500mA*
R
LOAD
= 6.6Ω
= 500mA*
LOAD
LOAD
I
I
R
= 16.6Ω
= 300mA*
R
LOAD
LOAD
= 12.6Ω
= 300mA*
R
LOAD
= 11Ω
LOAD
LOAD
I
= 300mA*
I
I
LOAD
*FOR V
= 5V
*FOR V
= 3.75V
*FOR V
= 3.3V
6
OUT
OUT
5
OUT
5
0
2
4
6
8
10
0
2
4
6
8
10
1
3
5
7
9
1
3
7
9
0
2
4
8
10
1
3
7
9
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
112935 G14
112935 G15
112935 G13
Shutdown Pin Threshold
(On-to-Off)
Shutdown Pin Threshold
(Off-to-On)
Ground Pin Current
70
60
50
40
30
20
10
0
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
V
V
V
= 3.3V (LT1129-3.3)
= 5V (LT1129-5)
= 3.75V (LT1129)
IN
IN
IN
I
= 1mA
LOAD
I
I
= 700mA
= 1mA
LOAD
LOAD
DEVICE IS OPERATING
IN DROPOUT
T = 125°C
J
T = 25°C
J
T = –50°C
J
0
0.2 0.3 0.4
0.5 0.6 0.7
0.1
25
TEMPERATURE (°C)
50
75 100 125
–50
–25
0
25
50
75 100 125
–50
0
–25
OUTPUT CURRENT (A)
TEMPERATURE (°C)
112935 G16
112935 G18
112935 G17
Shutdown Pin Current
Shutdown Pin Input Current
Adjust Pin Bias Current
400
350
300
250
200
150
100
50
10
9
8
7
6
5
4
3
2
1
0
25
20
V
SHDN
= 0V
V
ADJ
= V
= 3.75V
OUT
15
10
5
0
0
0
1
2
3
4
5
6
7
8
9
50
–50
25
50
75 100 125
–50
0
25
75 100 125
–25
0
–25
SHUTDOWN PIN VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
112935 G20
112935 G21
112935 G19
112935ff
7
Linear [ Linear ]
