LT3590
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Saturation Voltage
Shutdown Quiescent
Current vs VIN
(VCESAT
)
Schottky Forward Voltage Drop
20
18
16
14
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.8
0.7
0.6
0.5
0.4
0.3
0.2
V
T
= 0V
CTRL
A
= 25°C
25°C
–40°C
125°C
–40°C
125°C
25°C
12
10
100
0
20
30
(V)
40
50
60
0
50
200
10
150
60
20
40
100
80
V
SCHOTTKY FORWARD CURRENT (mA)
IN
SWITCH CURRENT (mA)
3590 G02
3590 G01
3590 G03
Shutdown Quiescent Current
vs Temperature
Quiescent Current
Schottky Leakage Current
20
18
16
14
12
10
2.0
1.5
1.0
0.5
0
600
550
500
450
V
V
= 0V
CTRL
IN
V
A
= 3.3V
CTRL
= 48V
T
= 25°C
V
= 48V
IN
V
= 24V
IN
V
= 4.5V
50
IN
400
–25
0
50
75 100 125
0
10
20
30
(V)
40
50
60
–25
0
75 100 125
–50
25
–50
25
V
TEMPERATURE (°C)
TEMPERATURE (°C)
IN
3590 G04
3590 G06
3590 G05
Switching Waveform
Transient Response
CTRL
5V/DIV
I
L
20mA/DIV
V
SW
50V/DIV
I
L
V
SW
50mA/DIV
20V/DIV
I
LED
50mA/DIV
3590 G08
3590 G07
40μs/DIV
1μs/DIV
V
LED
10 BLUE LEDs
= 48V
V
LED
10 WHITE LEDs
= 48V
IN
IN
I
= 50mA
I
= 50mA
L = 470μH (COILCRAFT)
3590f
4
Linear [ Linear ]
