SC4509 Semtech Corporation, SC4509 Datasheet - Page 11

• Manufacturer Part Number: SC4509
• Description: Highly Integrated Step-Up Converter
• Manufacturer: Semtech Corporation

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© 2007 Semtech Corp.
POWER MANAGEMENT
Typical Characteristics (Cont.)
35.0%
30.0%
25.0%
20.0%
15.0%
10.0%
5.0%
0.0%
Input Voltage vs. LED Current, V
2.7
2.9
V
ILED = 20mA
Switch Complementary Duty Cycle vs.
IN
3.1
= 3.6V; I
3.3
Switching Waveform
3.5
LED
= 20mA; V
3.7
VIN (V)
3.9
4.1
OUT
OUT
= 16V (4 LEDs)
4.3
= 16V, (4 LED)
ILED = 30mA
4.5
4.7
4.9
5.1
5.3
11
V
IN
= 3.6V; I
LED
Startup Current
= 30mA; V
OUT
= 16V (4 LEDs)
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SC4509