Datasheet

8
LT1963 Series
1963fc
TYPICAL PERFOR A CE CHARACTERISTICS
UW
TEMPERATURE (°C)
–50
REVERSE OUTPUT CURRENT (mA)
0
50
75
1963 G30
–25
25
100
125
LT1963-1.5/-1.8/-2.5/-3.3
LT1963
V
IN
= 0V
V
OUT
= 1.21V (LT1963)
V
OUT
= 1.5V (LT1963-1.5)
V
OUT
= 1.8V (LT1963-1.8)
V
OUT
= 2.5V (LT1963-2.5)
V
OUT
= 3.3V (LT1963-3.3)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
FREQUENCY (Hz)
RIPPLE REJECTION (dB)
80
70
60
50
40
30
20
10
0
10 1k 10k 1M
1963 G31
100 100k
C
OUT
= 10µF TANTALUM
C
OUT
= 100µF TANTALUM
+10 × 1µF CERAMIC
I
L
= 0.75A
V
IN
= V
OUT(NOMINAL)
+1V + 50mV
RMS
RIPPLE
TEMPERATURE (°C)
–50
76
74
72
70
68
66
64
62
25 75
1963 G32
–25 0
50 100 125
RIPPLE REJECTION (dB)
I
L
= 0.75A
V
IN
= V
OUT(NOMINAL)
+1V + 0.5V
P-P
RIPPLE AT f = 120Hz
Reverse Output Current Ripple Rejection
Ripple Rejection
SHDN Pin Input Current
TEMPERATURE (°C)
–50
7
6
5
4
3
2
1
0
25 75
1963 G25
–25 0
50 100 125
SHDN PIN INPUT CURRENT (µA)
V
SHDN
= 20V
TEMPERATURE (°C)
–50
ADJ PIN BIAS CURRENT (µA)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
50
75
1963 G26
–25
25
100
125
INPUT/OUTPUT DIFFERENTIAL (V)
02 6 10 14 18
CURRENT LIMIT (A)
3.0
2.5
2.0
1.5
1.0
0.5
0
4 8 12 16
1963 G27
20
T
J
= 125°C
T
J
= 25°C
T
J
= –50°C
∆V
OUT
= 100mV
ADJ Pin Bias Current
Current Limit
Current Limit
OUTPUT VOLTAGE (V)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
REVERSE OUTPUT CURRENT (mA)
1963 G29
0123
4
5
678910
LT1963
LT1963-1.8
LT1963-1.5
LT1963-3.3
LT1963-2.5
CURRENT FLOWS INTO OUTPUT PIN
V
OUT
= V
ADJ
(LT1963)
V
OUT
= V
FB
(LT1963-1.5/-1.8/-2.5/-3.3)
T
J
= 25°C
V
IN
= 0V
TEMPERATURE (°C)
–50
CURRENT LIMIT (A)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
50
75
1963 G28
–25
25
100
125
V
IN
= 7V
V
OUT
= 0V
Reverse Output Current
SHDN PIN VOLTAGE (V)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
SHDN PIN INPUT CURRENT (µA)
1963 G24
0246
8
10
12 14 16 18 20
SHDN Pin Input Current