LT1937 LINER [Linear Technology], LT1937 Datasheet - Page 22

• Manufacturer Part Number: LT1937
• Description: 20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN
• Manufacturer: LINER [Linear Technology]

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