Datasheet

3
LT3491
3491fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Switch Saturation Voltage (V
CESAT
)
Schottky Forward Voltage Drop
Shutdown Current (V
CTRL
= 0V)
Sense Voltage (V
CAP
– V
LED
)
vs V
CTRL
Open-Circuit Output Clamp
Voltage
Input Current in Output Open
Circuit
Switching Waveform
Transient Response
(T
A
= 25°C unless otherwise specified)
SWITCH CURRENT (mA)
0
350
300
250
200
150
100
50
0
150 300
3491 G01
50 100
200 400
250
350
SWITCH SATURATION VOLTAGE (mV)
SCHOTTKY FORWARD DROP (mV)
0
SCHOTTKY FORWARD CURRET (mA)
150
200
250
600
1000
3491 G02
100
50
0
200 400 800
300
350
400
1200
V
IN
(V)
0
SHUTDOWN CURRENT (µA)
9
12
15
12
3491 G03
6
3
0
3
6
9
V
CTRL
(mV)
0
SENSE VOLTAGE (mV)
80
120
2000
3491 G04
40
0
500
1000
1500
240
200
160
V
IN
(V)
0
OUTPUT CLAMP VOLTAGE (V)
27
28
12
3491 G05
26
25
3
6
9
30
29
V
IN
(V)
0
0
INPUT CURRENT (mA)
1
2
3
4
5
6
36 912
3491 G06
V
SW
10V/DIV
V
CAP
50mV/DIV
I
L
100mA/DIV
V
IN
= 3.6V
FRONT PAGE
APPLICATION CIRCUIT
200ns/DIV
3491 G07
V
CTRL
5V/DIV
V
CAP
5V/DIV
I
L
200mA/DIV
V
IN
= 3.6V
FRONT PAGE
APPLICATION CIRCUIT
1ms/DIV
3491 G08
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.
ELECTRICAL CHARACTERISTICS