LT3491
TYPICAL APPLICATIO S
Li-Ion Driver for One White LED
Efficiency
C2
1 μ F
LED
R SENSE
10 ?
60
55
50
45
40
35
V IN = 3.6V
V IN
3V TO 5V
V IN
CAP
30
L1
10 μ H
C1
1 μ F
SW
LT3491
GND
CTRL
3491 TA07a
SHUTDOWN
AND
DIMMING
CONTROL
25
20
15
10
0
5
10
15
20
LED CURRENT (mA)
C1: TAIYO YUDEN LMK212BJ105MD
C2: TAIYO YUDEN GMK316BJ105ML
L1: MURATA LQH32CN100
Li-Ion Driver for Two White LEDs
Efficiency
3491 TA07b
C2
1 μ F
R SENSE
10 ?
70
65
60
55
50
V IN = 3.6V
V IN
3V TO 5V
L1
10 μ H
C1
1 μ F
V IN
SW
LED
LT3491
GND
CAP
CTRL
3491 TA08a
SHUTDOWN
AND
DIMMING
CONTROL
45
40
35
30
25
0
5
10
15
20
LED CURRENT (mA)
C1: TAIYO YUDEN LMK212BJ105MD
C2: TAIYO YUDEN GMK316BJ105ML
L1: MURATA LQH32CN100
2-Cell Li-Ion Driver for Torch and Flash Mode LED Control
Efficiency
3491 TA08b
C2
4.7 μ F
80
I LED = 100mA
V IN
6V TO 9V
R SENSE
1 ?
D1
75
70
CAP
LED
65
FLASH MODE
I LED = 200mA V CTRL
1.5V
C1
1 μ F
V IN
CTRL
LT3491
SW
L1
10 μ H
60
55
V CTRL
680mV TORCH MODE
I LED = 100mA
GND
3491 TA09a
50
6
6.5
7
7.5
8
8.5
9
C1: TAIYO YUDEN LMK212BJ105MD
C2: TAIYO YUDEN LMK212BJ475MG
V IN (V)
3491 TA09b
D1: AOT-2015 HPW1751B
L1: MURATA LQH32CN100
3491fa
12
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