
LT3491
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3491E is guaranteed to meet performance specifications
from 0 ° C to 85 ° C. Specifications over the –40 ° C to 85 ° C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
TYPICAL PERFOR A CE CHARACTERISTICS (T A = 25 ° C unless otherwise specified)
350
300
250
200
150
100
50
Switch Saturation Voltage (V CESAT )
400
350
300
250
200
150
100
50
Schottky Forward Voltage Drop
15
12
9
6
3
Shutdown Current (V CTRL = 0V)
0
0
50
100 150 200 250 300 350 400
0
0
200
400
600
800
1000
1200
0
0
3
6
9
12
240
200
160
120
80
40
SWITCH CURRENT (mA)
Sense Voltage (V CAP – V LED )
vs V CTRL
3491 G01
30
29
28
27
26
SCHOTTKY FORWARD DROP (mV)
Open-Circuit Output Clamp
Voltage
3491 G02
6
5
4
3
2
1
V IN (V)
Input Current in Output Open
Circuit
3491 G03
0
0
500
1000
1500
2000
25
0
3
6
9
12
0
0
3
6
9
12
V CTRL (mV)
3491 G04
Switching Waveform
V SW
10V/DIV
V CAP
50mV/DIV
I L
100mA/DIV
V IN (V)
V CAP
5V/DIV
V CTRL
5V/DIV
I L
200mA/DIV
3491 G05
Transient Response
V IN (V)
3491 G06
V IN = 3.6V
200ns/DIV
3491 G07
V IN = 3.6V
1ms/DIV
3491 G08
FRONT PAGE
APPLICATION CIRCUIT
FRONT PAGE
APPLICATION CIRCUIT
3491fa
3