LT3498
TYPICAL PERFORMANCE CHARACTERISTICS
T = 25°C, unless otherwise specified.
A
Shutdown Current
LED Switch Saturation
Voltage (V
LED Schottky Forward
Voltage Drop
(V
= V
= 0V)
)
CESAT1
CTRL1
CTRL2
500
450
400
350
300
250
200
150
100
50
15
12
9
400
T = –50°C
350
T = –50°C
T = 125°C
300
250
T = 25°C
T = 25°C
T = 125°C
200
150
T = 125°C
T = 25°C
6
100
50
0
3
0
T = –50°C
0
0
4
6
8
10
12
2
0
50 100 150 200 250 300 350 400
SWITCH CURRENT (mA)
200
400
800
0
1000
600
V
(V)
IN
SCHOTTKY FORWARD DROP (mV)
3498 G03
1635 G07
3498 G02
Sense Voltage (V
– V
)
Sense Voltage (V
vs Temperature
– V
)
Sense Voltage (V
– V
)
CAP1
LED1
CAP1
LED1
CAP1
LED1
vs V
vs V
CAP1
CTRL1
206
202
198
194
190
186
206
202
198
194
190
186
240
200
T = 25°C
T = –50°C
T = 125°C
160
120
T = 125°C
T = 25°C
T = –50°C
80
40
0
–50 –25
0
25
50
75 100 125
0
5
15
CAP1 VOLTAGE (V)
20
25
10
0
500
V
1000
(mV)
1500
2000
TEMPERATURE (°C)
CTRL1
3498 G06
3498 G04
3498 G05
LED Current Limit
vs Temperature
Open Circuit Output
Clamp Voltage
Input Current in Output
Open Circuit
6
5
500
450
400
350
300
29
28
27
26
25
T = –50°C
T = 150°C
T = 150°C
T = 25°C
4
3
T = 25°C
T = –50°C
2
1
0
2
4
6
8
10
12
–50 –25
0
25
50
75 100 125
0
4
6
8
10
12
2
V
(V)
TEMPERATURE (°C)
V
(V)
IN
IN
3498 G09
3498 G07
3498 G08
3498f
4
Linear [ Linear ]
