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SC4538 Datasheet(PDF) 5 Page - Semtech Corporation

Part # SC4538
Description  High Effi ciency Boost Converter for up to 10 LEDs
PDF  14 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4538 Datasheet(HTML) 5 Page - Semtech Corporation

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5
Typical Characteristics
SC4538
70
74
78
82
86
90
0
8
16
24
32
40
2.8VIN
3.6VIN
5.5VIN
70
74
78
82
86
90
2.8
3.3
3.9
4.4
5.0
5.5
6 LEDs
4 LEDs
10 LEDs
-6
-4
-2
0
2
4
6
0
8
16
24
32
40
Efficiency vs. I
BL
0
20
40
60
80
100
0
612
18
24
30
2.8VIN
3.6VIN
5.5VIN
Efficiency vs. Input Voltage
70
74
78
82
86
90
2.8
3.3
3.9
4.4
5.0
5.5
10mA
20mA
30mA
I
BL (mA)
V
IN (V)
70
74
78
82
86
90
2.8
3.3
3.9
4.4
5.0
5.5
VOUT
LED
V
IN (V)
Efficiency vs. Input Voltage
Efficiency vs. Output Voltage
V
OUT (V)
Efficiency vs. Input Voltage
V
IN (V)
Normalized I
BL vs. Output Voltage
V
OUT (V)
All data taken with V
OUT
= 20V (6 white LEDs), R
ISET
= 5.76kΩ (I
BL
= 20mA), V
IN
= 3.6V, L = 22μH, and efficiency (η) = P
LED
/P
IN
unless otherwise noted.



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