Datasheet

LT1121/LT1121-3.3/LT1121-5
7
1121fg
TYPICAL PERFORMANCE CHARACTERISTICS
Shutdown Pin Current Shutdown Pin Input Current
LT1121
Adjust Pin Bias Current
TEMPERATURE (°C)
–50
SHUTDOWN PIN CURRENT (μA)
10
9
8
7
6
5
4
3
2
1
0
0
50
75
1121 G19
–25
25
100
125
V
SHDN
= 0V
SHUTDOWN PIN VOLTAGE (V)
0
0
SHUTDOWN PIN INPUT CURRENT (mA)
5
15
20
25
2
4
5 9
1121 G20
10
1 3
6
7
8
TEMPERATURE (°C)
–50
ADJUST PIN BIAS CURRENT (nA)
400
350
300
250
200
150
100
50
0
0
50
75
1121 G21
–25
25
100
125
Reverse Output Current Current Limit Current Limit
Reverse Output Current Ripple Rejection Ripple Rejection
TEMPERATURE (°C)
–50
OUTPUT PIN CURRENT (μA)
30
25
20
15
10
5
0
0
50
75
1121 G22
–25
25
100
125
V
IN
= 0V
V
OUT
= 5V (LT1121-5)
V
OUT
= 3.3V (LT1121-3.3)
V
OUT
= 3.8V (LT1121)
INPUT VOLTAGE (V)
0
SHORT-CIRCUIT CURRENT (mA)
400
350
300
250
200
150
100
50
0
2
4
5
1121 G23
1
3
6
7
V
OUT
= 0V
TEMPERATURE (°C)
–50
CURRENT LIMIT (mA)
400
350
300
250
200
150
100
50
0
0
50
75
1121 G24
–25
25
100
125
V
IN
= 7V
V
OUT
= 0V
OUTPUT VOLTAGE (V)
0
OUTPUT PIN CURRENT (μA)
100
90
80
70
60
50
40
30
20
10
0
8
1121 G25
2
4
6
10
1 3 5 7 9
T
J
= 25°C
V
IN
= 0V
CURRENT FLOWS
INTO OUTPUT PIN
LT1121-3.3
LT1121
(V
OUT
= V
ADJ
)
LT1121-5
TEMPERATURE (°C)
–50
RIPPLE REJECTION (dB)
64
62
60
58
56
54
52
50
0
50
75
1121 G26
–25
25
100
125
V
IN
= V
OUT
(NOMINAL) + 1V
+ 0.5V
P-P
RIPPLE AT f = 120Hz
I
OUT
= 100mA
FREQUENCY (Hz)
RIPPLE REJECTION (dB)
100
90
80
70
60
50
40
30
20
10
0
10 1k 10k 1M
1121 G27
100 100k
C
OUT
= 1μF
SOLID TANTALUM
C
OUT
= 47μF
SOLID TANTALUM
I
OUT
= 100mA
V
IN
= 6V + 50mV
RMS
RIPPLE