Datasheet

LT3519/LT3519-1/LT3519-2
5
3519fa
FB Regulation Voltage
vs Temperature
FB OPENLED Threshold
vs Temperature
SHDN/UVLO Threshold
vs Temperature
Switch Saturation Voltage
(V
CESAT
)
Schottky Leakage Current
vs Temperature
Schottky Forward Voltage Drop
TEMPERATURE (°C)
–50
V
FB
(V)
1.23
1.24
1.25
25 75 125
3519 G10
1.22
1.21
1.20
–25 0
50
100
V
IN
= 12V
TEMPERATURE (°C)
–50
0
V
FB
-V
FB_OPENLED
(mV)
10
30
40
50
100
70
0
50
75
3519 G11
20
80
90
60
–25 25
100
125
V
IN
= 12V
TEMPERATURE (°C)
–50
SHDN/UVLO THRESHLD (V)
1.26
1.28
1.30
25 75 125
3519 G12
1.24
1.22
1.20
–25 0
50
100
V
IN
= 12V
SHDN/UVLO RISING
SHDN/UVLO FALLING
SWITCH CURRENT (mA)
0
SWITCH VOLTAGE (V)
300
400
500
800
3519 G13
200
100
250
350
450
150
50
0
200
400
600
1000
TEMPERATURE (°C)
–50
0
SCHOTTKY LEAKAGE CURRENT (μA)
1
3
4
5
10
7
0
50
75
3519 G14
2
8
9
6
–25 25
100
125
V
R
= 24V
SCHOTTKY FORWARD VOLTAGE DROP (mV)
0
0
SCHOTTKY FORWARD CURRENT (mA)
100
300
400
500
400
800
1000
900
3519 G15
200
200 600
600
700
800
TYPICAL PERFORMANCE CHARACTERISTICS
(T
A
= 25°C unless otherwise noted)
Oscillator Frequency
vs Temperature (LT3519-1)
Oscillator Frequency
vs Temperature (LT3519-2)
TEMPERATURE (°C)
–50
0.7
FREQUENCY (MHz)
0.8
50
100
125
1.2
3519 G16
250–25 75
0.9
1.0
1.1
TEMPERATURE (°C)
–50
1.9
FREQUENCY (MHz)
2.0
50
100
125
2.5
3519 G17
250–25 75
2.1
2.3
2.2
2.4