Datasheet

LT3758/LT3758A
7
3758afd
typicAl perForMAnce chArActeristics
T
A
= 25°C, unless otherwise noted.
INTV
CC
Line Regulation
INTV
CC
Dropout Voltage
vs Current, Temperature
INTV
CC
vs Temperature
INTV
CC
Minimum Output
Current vs V
IN
INTV
CC
Load Regulation
–75 –50 0 50 75–25 25 100 150125
TEMPERATURE (°C)
7.0
INTV
CC
(V)
7.1
7.2
7.3
7.4
3758 G13
V
IN
(V)
0
INTV
CC
VOLTAGE (V)
90
7.25
7.20
20 30 5010 40 60 70 80 100
7.15
7.10
7.30
3758 G16
1
0
5
10
20
30
10 100
45
40
15
25
35
T
J
= 150°C
V
IN
(V)
3758 G14
INTV
CC
CURRENT (mA)
INTV
CC
= 6V
INTV
CC
= 4.7V
INTV
CC
LOAD (mA)
0
6.8
7
7.1
7.2
7.3
10
20 25
6.9
5
15
3758 G15
INTV
CC
VOLTAGE (V)
V
IN
= 8V
0 42 6 8 10
INTV
CC
LOAD (mA)
DROPOUT VOLTAGE (mV)
500
600
300
400
200
100
0
1000
900
800
700
3758 G17
150°C
25°C
0°C
–55°C
75°C
V
IN
= 6V
125°C
Gate Drive Rise
and Fall Time vs INTV
CC
Typical Start-Up Waveforms
FBX Frequency Foldback
Waveforms During Overcurrent
INTV
CC
(V)
3
TIME (ns)
20
25
15
10
9
6
12 15
5
0
30
3758 G19
C
L
= 3300pF
RISE TIME
FALL TIME
2ms/DIV
SEE TYPICAL APPLICATION: 18V TO 72V INPUT,
24V OUTPUT SEPIC CONVERTER
V
OUT
10V/DIV
I
L1A
+ I
L1B
1A/DIV
3758 G20
V
IN
= 48V
50µs/DIV
V
OUT
20V/DIV
V
SW
50V/DIV
I
L1A
+ I
L1B
2A/DIV
3758 G21
V
IN
= 48V
SEE TYPICAL APPLICATION: 18V TO 72V INPUT,
24V OUTPUT SEPIC CONVERTER
Gate Drive Rise
and Fall Time vs C
L
C
L
(nF)
0
TIME (ns)
60
70
80
50
40
5 1510 20 25 30
10
0
30
90
20
3758 G18
RISE TIME
INTV
CC
= 7.2V
FALL TIME
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