LT1963 Series
U W
TYPICAL PERFOR A CE CHARACTERISTICS
SHDN Pin Input Current
Current Limit
ADJ Pin Bias Current
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
7
6
5
4
3
2
1
0
3.0
2.5
2.0
1.5
1.0
0.5
0
V
SHDN
= 20V
T = 25°C
J
T = –50°C
J
T = 125°C
J
∆V
OUT
= 100mV
50
100 125
–50 –25
0
25
75
–50
0
25
50
75 100 125
–25
0
2
4
6
8
10 12 14 16 18 20
TEMPERATURE (°C)
INPUT/OUTPUT DIFFERENTIAL (V)
TEMPERATURE (°C)
1963 G25
1963 G26
1963 G27
Reverse Output Current
Current Limit
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
V
= 7V
IN
OUT
= 0V
LT1963-1.8
LT1963
LT1963-3.3
LT1963-2.5
T
= 25°C
IN
J
V
= 0V
CURRENT FLOWS INTO
OUTPUT PIN
V
OUT
V
OUT
= V
(LT1963)
ADJ
FB
= V (LT1963-1.8/-2.5/-3.3)
–50
0
25
50
75 100 125
4
–25
0
1
2
3
6
7
8
9
10
5
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
1963 G28
1963 G29
Ripple Rejection
Ripple Rejection
Reverse Output Current
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
80
76
74
72
70
68
66
V
V
V
V
V
= 0V
IN
= 1.21V (LT1963)
OUT
OUT
OUT
OUT
70
60
50
40
30
20
10
0
= 1.8V (LT1963-1.8)
= 2.5V (LT1963-2.5)
= 3.3V (LT1963-3.3)
LT1963-1.8/-2.5/-3.3
LT1963
C
= 100µF TANTALUM
+10 × 1µF CERAMIC
OUT
C
= 10µF TANTALUM
OUT
I
= 0.75A
= V
L
IN
64
I
= 0.75A
L
V
+1V + 0.5V
P-P
OUT(NOMINAL)
V
= V
+1V + 50mV
10k
RIPPLE
IN
OUT(NOMINAL)
RMS
RIPPLE AT f = 120Hz
25
TEMPERATURE (°C)
62
50
100 125
–50
0
25
50
75 100 125
–50 –25
0
75
–25
10
100
1k
100k
1M
TEMPERATURE (°C)
FREQUENCY (Hz)
1963 G31
1963 G30
1963 G32
1963fa
7
Linear Systems [ Linear Systems ]
