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