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SC4509
POWER MANAGEMENT
Typical Characteristics
80%
75%
70%
65%
60%
Ef ? ciency vs. LED Current
V IN = 2.7V, V OUT = 16V, (4 LED)
85%
80%
75%
70%
65%
Ef ? ciency vs. LED Current
V IN = 3.3V, V OUT = 16V, (4 LED)
60%
55%
55%
50%
45%
40%
35%
30%
50%
45%
40%
35%
30%
0
2
4
6
8
10
12
14
16
18
20
22
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
85%
80%
75%
70%
ILED (mA)
Ef ? ciency vs. LED Current
V IN = 3.6V, V OUT = 16V, (4 LED)
85%
80%
75%
70%
ILED (mA)
Ef ? ciency vs. LED Current vs. Input Voltage
V OUT = 12V, (3 LED)
65%
60%
55%
50%
45%
40%
35%
65%
60%
55%
50%
45%
40%
35%
VIN = 2.7V
VIN = 3.6V
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
0
5
10
15
20
25
30
35
ILED (mA)
Feedback Voltage vs. Temperature vs. LED Current,
ILED (mA)
Frequency vs. Temperature vs. Input Voltage,
203.0
202.0
V OUT = 16V
1.20
V OUT = 16V
VIN = 2.7V
1.15
201.0
ILED = 20mA
200.0
ILED = 30mA
1.10
VIN = 3.3V
VIN = 3.6V
199.0
1.05
198.0
197.0
1.00
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
Temperature (Deg. C)
Temperature (Deg. C)
? 2007 Semtech Corp.
9
www.semtech.com
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