LT1963 Series
TYPICAL PERFOR A CE CHARACTERISTICS
SHDN Pin Input Current
5.0
4.5
7
SHDN PIN INPUT CURRENT (µA)
SHDN PIN INPUT CURRENT (µA)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
2
4
6 8 10 12 14 16 18 20
SHDN PIN VOLTAGE (V)
1963 G24
5
4
3
2
1
0
–50 –25
ADJ PIN BIAS CURRENT (µA)
Current Limit
3.0
2.5
CURRENT LIMIT (A)
4.0
REVERSE OUTPUT CURRENT (mA)
CURRENT LIMIT (A)
T
J
= 25°C
2.0
T
J
= 125°C
1.5
1.0
0.5
∆V
OUT
= 100mV
0
0
2
6
8
10
12
14
16
18
20
4
INPUT/OUTPUT DIFFERENTIAL (V)
1963 G27
T
J
= – 50°C
Reverse Output Current
1.0
REVERSE OUTPUT CURRENT (mA)
RIPPLE REJECTION (dB)
RIPPLE REJECTION (dB)
V
IN
= 0V
0.9 V
OUT
= 1.21V (LT1963)
= 1.5V (LT1963-1.5)
V
0.8 V
OUT
= 1.8V (LT1963-1.8)
OUT
0.7 V
OUT
= 2.5V (LT1963-2.5)
V
OUT
= 3.3V (LT1963-3.3)
0.6
LT1963-1.5/-1.8/-2.5/-3.3
0.5
0.4
0.3
0.2
0.1
0
–50
–25
50
25
0
75
TEMPERATURE (°C)
100
125
LT1963
8
U W
1963 G30
SHDN Pin Input Current
5.0
ADJ Pin Bias Current
V
SHDN
= 20V
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
6
50
25
75
0
TEMPERATURE (°C)
100
125
0
–50
–25
50
25
0
75
TEMPERATURE (°C)
100
125
1963 G25
1963 G26
Current Limit
V
IN
= 7V
3.5 V
OUT
= 0V
3.0
2.5
2.0
1.5
1.0
0.5
0
–50
–25
50
25
0
75
TEMPERATURE (°C)
100
125
Reverse Output Current
5.0
T
J
= 25°C
4.5 V
IN
= 0V
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
3 4 5 6 7 8
OUTPUT VOLTAGE (V)
CURRENT FLOWS INTO OUTPUT PIN
V
OUT
= V
ADJ
(LT1963)
V
OUT
= V
FB
(LT1963-1.5/-1.8/-2.5/-3.3)
1
2
9
10
LT1963-2.5
LT1963-3.3
LT1963-1.5
LT1963-1.8
LT1963
1963 G28
1963 G29
Ripple Rejection
80
70
60
50
40
30
20
C
OUT
= 100µF TANTALUM
+10
×
1µF CERAMIC
C
OUT
= 10µF TANTALUM
76
74
72
70
68
66
Ripple Rejection
10
I
L
= 0.75A
V
IN
= V
OUT(NOMINAL)
+1V + 50mV
RMS
RIPPLE
0
10
1k
10k
1M
100
100k
FREQUENCY (Hz)
1963 G31
64
I
L
= 0.75A
V
IN
= V
OUT(NOMINAL)
+1V + 0.5V
P-P
RIPPLE AT f = 120Hz
62
50
100
25
75
– 50 – 25
0
TEMPERATURE (°C)
125
1963 G32
1963fc
LINER [ LINEAR TECHNOLOGY ]
