LT1761 Series
TYPICAL PERFORMANCE CHARACTERISTICS
SHDN Pin Threshold
(Off to On)
SHDN Pin Input Current
SHDN Pin Input Current
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
V
= 20V
SHDN
I
= 100mA
L
I
= 1mA
L
50
TEMPERATURE (°C)
75 100 125
4
50
125
–50
0
25
0
1
2
3
5
6
7
8
9
10
–50
0
25
75
–25
–25
100
TEMPERATURE (°C)
SHDN PIN VOLTAGE (V)
1761 G27
1761 G28
1761 G29
ADJ Pin Bias Current
Current Limit
Current Limit
100
90
80
70
60
50
40
30
20
10
0
350
300
250
200
150
100
50
350
300
250
200
150
100
50
V
V
= 7V
V
T
= 0V
IN
OUT
OUT
J
= 0V
= 25°C
0
0
–50
0
25
50
75 100 125
0
2
3
4
5
6
7
–50
0
25
50
75 100 125
–25
1
–25
TEMPERATURE (oC)
INPUT VOLTAGE (V)
TEMPERATURE (°C)
1761 G30
1761 G31
1761 G32
Reverse Output Current
Reverse Output Current
Input Ripple Rejection
25.0
22.5
80
70
60
50
40
30
20
10
0
100
V
V
V
= 0V
IN
I = 100mA
L
T = 25°C
LT1761-BYP
LT1761-SD
J
= 1.22V (LT1761-BYP, -SD)
= 1.2V (LT1761-1.2)
= 1.5V (LT1761-1.5)
= 1.8V (LT1761-1.8)
= 2V (LT1761-2)
= 2.5V (LT1761-2.5)
= 2.8V (LT1761-2.8)
= 3V (LT1761-3)
OUT
OUT
V
= V
+
90 V = 0V
IN
OUT(NOMINAL)
IN
LT1761-BYP
LT1761-5
1V + 50mV
RIPPLE
CURRENT FLOWS
RMS
V
20.0 OUT
80
70
60
50
40
30
20
10
0
C
= 0
INTO OUTPUT PIN
BYP
V
OUT
LT1761-1.2
V
= V
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
17.5
15.0
12.5
10.0
7.5
OUT
ADJ
(LT1761-BYP, -SD)
LT1761-1.5
C
= 10μF
LT1761-1.8
LT1761-2
LT1761-2.5
OUT
= 3.3V (LT1761-3.3)
= 5V (LT1761-5)
LT1761-2.8
LT1761-3
LT1761-BYP,-SD
5.0
C
= 1μF
OUT
LT1761-1.2,-1.5,-1.8,-2,
-2.5,-2.8,-3,-3.3,-5
LT1761-3.3
2.5
LT1761-5
0
10
100
1k
10k
100k
1M
–50
0
25
50
75 100 125
–25
4
0
1
2
3
5
6
7
8
9
10
FREQUENCY (Hz)
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
1761 G35
1761 G34
1761 G33
1761sff
11
Linear [ Linear ]
