SC4509 Semtech Corporation, SC4509 Datasheet - Page 9

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

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