LT1963A Series
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Current Limit
Current Limit
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
3.0
V
V
= 7V
IN
OUT
= 0V
2.5
T
J
= 25°C
2.0
1.5
1.0
0.5
0
T
= –50°C
J
T
J
= 125°C
∆V
= 100mV
OUT
4
0
2
6
8
10 12 14 16 18 20
–50
0
25
50
75
125
–25
100
INPUT/OUTPUT DIFFERENTIAL (V)
TEMPERATURE (°C)
1963 G27
1963 G28
Reverse Output Current
Reverse Output Current
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
V
V
V
V
V
= 0V
IN
= 1.21V (LT1963A)
OUT
OUT
OUT
OUT
OUT
LT1963A-1.8
LT1963A-1.5
= 1.5V (LT1963A-1.5)
= 1.8V (LT1963A-1.8)
= 2.5V (LT1963A-2.5)
= 3.3V (LT1963A-3.3)
LT1963A
LT1963A-1.8/-2.5/-3.3
LT1963A-3.3
T = 25°C
IN
CURRENT FLOWS INTO
OUTPUT PIN
J
V
LT1963A
= 0V
LT1963A-2.5
V
OUT
V
OUT
= V
FB
(LT1963A)
ADJ
= V (LT1963A-1.5/1.8/-2.5/-3.3)
–50
0
25
50
75 100 125
4
–25
0
1
2
3
5
6
7
8
9
10
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
1963 G30
1963 G29
Ripple Rejection
Ripple Rejection
LT1963A Minimum Input Voltage
80
70
60
50
40
30
20
10
0
76
3.0
74
72
70
68
66
64
62
2.5
2.0
1.5
1.0
0.5
0
I
= 1.5A
L
I
= 500mA
L
I
= 100mA
L
C
= 100µF TANTALUM
+10 1µF CERAMIC
OUT
C
= 10µF TANTALUM
OUT
I
= 0.75A
L
I
= 0.75A
L
V
= V
+1V + 0.5V
IN
OUT(NOMINAL) P-P
V
= V
+1V + 50mV
10k
RIPPLE
IN
OUT(NOMINAL)
RMS
RIPPLE AT f = 120Hz
–50 –25 25
TEMPERATURE (°C)
50
100 125
0
75
10
100
1k
100k
1M
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
FREQUENCY (Hz)
1963 G31
1963 G32
1963 G33
1963af
8
Linear [ Linear ]
