LT3498
TYPICAL APPLICATIONS
Li-Ion to Six White LEDs and OLED/LCD Bias
V
= 3V TO 5V
C
C2
0.47µF
IN
IN
4.7µF
R
SENSE1
L1
15µH
L2
10µH
10Ω
D1
24V
24mA
CAP1 SW1
V
IN
SW2
CAP2 V
OUT2
C3
10µF
LT3498
C1
1µF
R
FB2
LED1 CTRL1 GND1 GND2 CTRL2
FB2
2.21MΩ
20mA
OFF
OFF
ON
ON
SHUTDOWN AND
DIMMING CONTROL
SHUTDOWN AND
CONTROL
3498 TA06
C
IN
, C2: X5R OR X7R WITH SUFFICIENT VOLTAGE RATING
C1: TAIYO YUDEN GMK212BJ105KG
C3: TAIYO YUDEN TMK316BJ106ML
D1: CENTRAL SEMICONDUCTOR CMDSH-3
L1: MURATA LQH32CN150K53
L2: MURATA LQH32CN100K53
LED Efficiency,
IN
OLED Efficiency and Power Loss
V
= 3.6V, 6 LEDs
V
= 3.6V, V
= 16V
IN
OUT2
80
75
70
65
60
55
50
80
75
70
65
60
55
50
45
40
400
350
300
250
200
150
100
50
0
1
100
5
10
LED CURRENT (mA)
20
0.1
10
0
15
LOAD CURRENT (mA)
3498 TA06b
LOAD FROM V
OUT2
LOAD FROM CAP2
POWER LOSS FROM V
POWER LOSS FROM CAP2
OUT2
3498 TA06c
3498f
22
Linear [ Linear ]
