Datasheet

4
LT3491
3491fa
Quiescent Current (V
CTRL
= 3V)
Switching Current Limt
vs Duty Cycle
Schottky Leakage Current
vs Temperature
Open-Circuit Output Clamp Voltage
vs Temperature
Input Current in Output Open Circuit
vs Temperature
Switching Frequency
vs Temperature
TYPICAL PERFOR A CE CHARACTERISTICS
UW
(T
A
= 25°C unless otherwise specified)
Sense Voltage (V
CAP
– V
LED
)
vs V
CTRL
Sense Voltage (V
CAP
– V
LED
)
vs V
CAP
Sense Voltage (V
CAP
– V
LED
)
vs Temperature
V
IN
(V)
0
0
QUIESCENT CURRENT (mA)
0.5
1.0
1.5
2.0
2.5
3.0
36 912
3491 G09
DUTY CYCLE (%)
30
0
CURRENT LIMIT (mA)
50
150
200
250
70
450
3491 G10
100
50
40
80
60 90
300
350
400
25°C
TEMPERATURE (°C)
–50
0
SCHOTTKY LEAKAGE CURRENT (µA)
3
6
9
12
15
–25
02550
3491 G11
75 100
V
R
= 10V
V
R
= 16V
V
R
= 20V
TEMPERATURE (°C)
–50 –25
25
OUTPUT CLAMP VOLTAGE (V)
27
30
0
50
75
3491 G12
26
29
28
25
100
125
TEMPERATURE (°C)
–50
INPUT CURRENT (mA)
4
5
6
25 75
3491 G13
3
2
–25 0
50 100 125
1
0
V
IN
= 3V
TEMPERATURE (°C)
–50 –25
1.95
SWITCH FREQUENCY (MHz)
2.05
2.20
0
50
75
3419 G14
2.00
2.15
2.10
25
100
125
V
CTRL
(mV)
0
0
SENSE VOLTAGE (mV)
40
80
120
160
200
240
500 1000 1500 2000
3491 G15
–50°C
25°C
85°C
V
CAP
(V)
5
SENSE VOLTAGE (mV)
200
204
25
3491 G16
196
192
10
15
20
212
208
TEMPERATURE (°C)
–50 –25
192
SENSE VOLTAGE (mV)
200
212
0
50
75
3491 G17
196
208
204
25
100
125