LT1129/LT1129-3.3/LT1129-5
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Shutdown Pin Input Current
Shutdown Pin Current
Adjust Pin Bias Current
10
9
8
7
6
5
4
3
2
1
0
400
350
300
250
200
150
100
50
25
20
V
= 0V
V
= V
= 3.75V
OUT
SHDN
ADJ
15
10
5
0
0
50
75 100 125
–50
–25
0
25
50
75 100 125
–50
0
25
–25
7
0
1
2
3
4
5
6
8
9
TEMPERATURE (°C)
TEMPERATURE (°C)
SHUTDOWN PIN VOLTAGE (V)
1129 G28
1129 G25
1129 G24
Reverse Output Current
Current Limit
Current Limit
30
25
20
15
10
5
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
V
V
V
V
= 0V
= V
V
= 0V
IN
OUT
= 5V (LT1129-5)
OUT
OUT
OUT
SENSE
SENSE
= V
= V
= 3.3V (LT1129-3.3)
= 3.75V (LT1129)
ADJ
V
V
= 7V
OUT
IN
= 0V
0
–50
0
25
50
75 100 125
0
2
3
4
5
7
50
–25
1
6
–50
0
25
75 100 125
–25
TEMPERATURE (°C)
INPUT VOLTAGE (V)
TEMPERATURE (°C)
1129 G29
1129 G07
1129 G08
Reverse Output Current
Ripple Rejection
Ripple Rejection
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
70
68
66
64
62
60
58
56
I
= 500mA
T
= 25°C, V = 0V
OUT
IN
J
V
IN
(V – V
)AVG = 1V
OUT
IN
V
= 6V + 50mV
RIPPLE
RMS
= V
OUT
SENSE
V
= 0.5V
RIPPLE
P-P
(LT1129-3.3/LT1129-5)
V
CURRENT FLOWS
INTO DEVICE
I
= 0.7A
L
= V
(LT1129)
OUT
ADJ
C
= 47µF
OUT
SOLID
TANTALUM
LT1129
LT1129-3.3
C
= 3.3µF
OUT
SOLID
TANTALUM
LT1129-5
10
100
1k
10k
100k
1M
0
2
4
6
8
10
1
3
5
7
9
50
–50
0
25
75 100 125
–25
FREQUENCY (Hz)
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
1129 G01
1129 G30
1129 G03
112935fc
7
Linear Systems [ Linear Systems ]
