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LT1937 Datasheet(PDF) 22 Page - Linear Technology

Part # LT1937
Description  20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1937 Datasheet(HTML) 22 Page - Linear Technology

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LT3498
22
3498f
TYPICAL APPLICATIONS
SHUTDOWN AND
DIMMING CONTROL
SHUTDOWN AND
CONTROL
VIN
C2
0.47
µF
24V
24mA
L2
10
µH
L1
15
µH
D1
VIN = 3V TO 5V
VOUT2
RFB2
2.21M
Ω
3498 TA06
LT3498
SW1
CAP1
SW2
CAP2
FB2
CTRL1
LED1
CTRL2
GND2
GND1
C3
10
µF
ON
OFF
ON
OFF
CIN
4.7
µF
CIN, 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
RSENSE1
10
Ω
C1
1
µF
20mA
LED Efficiency,
VIN = 3.6V, 6 LEDs
OLED Efficiency and Power Loss
VIN = 3.6V, VOUT2 = 16V
Li-Ion to Six White LEDs and OLED/LCD Bias
LED CURRENT (mA)
0
65
70
80
15
60
55
510
20
50
75
3498 TA06b
LOAD CURRENT (mA)
65
70
80
60
50
40
55
45
75
250
300
400
200
100
0
150
50
350
3498 TA06c
LOAD FROM VOUT2
LOAD FROM CAP2
POWER LOSS FROM VOUT2
POWER LOSS FROM CAP2
0.1
10
1
100



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