Datasheet

LT3748
4
3748fb
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typical perForMance characteristics
INTV
CC
Undervoltage Lockout
vs Temperature
INTV
CC
Voltage vs V
IN
Voltage
INTV
CC
Regulator Dropout
vs INTV
CC
Current
Soft-Start Current vs Temperature
Output Regulation vs Temperature
Quiescent Current vs Temperature
INTV
CC
Voltage vs Temperature
T
A
= 25°C, unless otherwise noted.
Quiescent Current vs V
IN
Voltage
INTV
CC
Dropout vs Temperature
TEMPERATURE (°C)
–55
14.4
V
OUT
(V)
14.6
14.8
15.0
15.2
0 50
100
150
3748 G01
15.4
15.6
–25 25
75
125
FIGURE 16 CIRCUIT
I
OUT
= 150mA ON EACH OUTPUT
V
IN
= 12V
TEMPERATURE (°C)
–55
QUIESCENT CURRENT (mA)
1.3
1.4
1.5
150
3748 G02
1.2
1.1
0.8
0
50
100
–25
25
75
125
1.0
0.9
1.7
1.6
V
SS
= 0V
INTV
CC
= OPEN
V
IN
= 72V
V
IN
= 36V
V
IN
= 12V
V
IN
= 6V
V
IN
(V)
0
QUIESCENT CURRENT (mA)
0.6
0.8
1.0
60
100
3748 G03
0.4
0.2
0
20 40 80
1.2
1.4
1.6
V
SS
= 0V
INTV
CC
= OPEN
TEMPERATURE (°C)
–55
6.5
INTV
CC
VOLTAGE (V)
6.6
6.8
6.9
7.0
7.5
7.2
0
50
75
3748 G04
6.7
7.3
7.4
7.1
–25 25
100
125
150
I
INTVCC
= 0mA
I
INTVCC
= 10mA
V
IN
VOLTAGE (V)
4 6
V
INTVCC
(V)
6.0
6.5
7.0
60
3748 G05
5.5
5.0
8 20
80
10 40 100
4.5
4.0
7.5
I
INTVCC
= 0mA
I
INTVCC
= 10mA
TEMPERATURE (°C)
–55
INTV
CC
UVLO (V)
3.7
3.8
3.9
25 50 75 100 125
3748 G06
3.6
3.5
–25 0 150
3.4
3.3
4.0
RISING THRESHOLD
FALLING THRESHOLD
INTV
CC
CURRENT (mA)
0
0
INTV
CC
REGULATOR DROPOUT (V)
0.5
1.0
1.5
2.0
2.5
3.0
V
IN
= 5V
10 20 30 40
3748 G07
150°C
100°C
25°C
–50°C
TEMPERATURE (°C)
–55
0
INTV
CC
DROPOUT (V)
0.5
1.0
1.5
2.0
0 50
100
150
3748 G08
2.5
3.0
–25 25
75
125
V
IN
= 5V
I
INTVCC
= 20mA
I
INTVCC
= 10mA
I
INTVCC
= 5mA
TEMPERATURE (°C)
–55
0
SOFT-START CURRENT (µA)
1
2
3
4
0 50
100
150
3748 G09
5
6
–25 25
75
125
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