6
LT1129/LT1129-3.3/LT1129-5
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
FREQUENCY (Hz)
RIPPLE REJECTION (dB)
100
90
80
70
60
50
40
30
20
10
0
10 1k 10k 1M
1129 G01
100 100k
I
OUT
= 500mA
V
IN
= 6V + 50mV
RMS
RIPPLE
C
OUT
= 47µF
SOLID
TANTALUM
C
OUT
= 3.3µF
SOLID
TANTALUM
Shutdown Pin Current
SHUTDOWN PIN VOLTAGE (V)
0
0
SHUTDOWN PIN INPUT CURRENT (mA)
5
15
20
25
2
4
59
1129 G24
10
13
6
7
8
Shutdown Pin Input Current
Adjust Pin Bias Current
Current Limit
TEMPERATURE (°C)
–50
SHORT-CIRCUIT CURRENT (A)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
50
75
1129 G08
–25
25
100
125
V
IN
= 7V
V
OUT
= 0V
Current Limit
INPUT VOLTAGE (V)
0
SHORT-CIRCUIT CURRENT (A)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
2
4
5
1129 G07
1
3
6
7
V
OUT
= 0V
Reverse Output Current
Reverse Output Current Ripple RejectionRipple Rejection
TEMPERATURE (°C)
–50
RIPPLE REJECTION (dB)
70
68
66
64
62
60
58
56
0
50
75
1129 G03
–25
25
100
125
(V
IN
– V
OUT
)
AVG
= 1V
V
RIPPLE
= 0.5V
P-P
I
L
= 0.7A
TEMPERATURE (°C)
–50
OUTPUT CURRENT (µA)
30
25
20
15
10
5
0
0
50
75
1129 G29
–25
25
100
125
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)
TEMPERATURE (°C)
–50
ADJUST PIN BIAS CURRENT (nA)
400
350
300
250
200
150
100
50
0
0
50
75
1129 G28
–25
25
100
125
V
ADJ
= V
OUT
= 3.75V
OUTPUT VOLTAGE (V)
0
OUTPUT CURRENT (µA)
100
90
80
70
60
50
40
30
20
10
0
8
1129 G30
2
4
6
10
13579
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
LT1129-3.3
LT1129
LT1129-5
TEMPERATURE (°C)
–50
SHUTDOWN PIN CURRENT (µA)
10
9
8
7
6
5
4
3
2
1
0
0
50
75
1129 G25
–25
25
100
125
V
SHDN
= 0V
