SC4509 Semtech Corporation, SC4509 Datasheet - Page 10

• 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.)
800
700
600
500
400
300
200
100
55.0
50.0
45.0
40.0
35.0
30.0
25.0
20.0
15.0
10.0
5.0
0.0
EN/SS Input Current vs. EN/SS Voltage vs. Temperature,
22
20
18
16
14
12
10
8
6
0.0
15
0
0.2
10
40°C
25
LED Current vs. PWM Dimming Duty Cycle
Switch Current Limit vs. Complementary
V
0.4
IN
20
Duty Cycle (1-D) vs. Temperature
= 3.6V; V
35
0°C
0.6
V
30
IN
45
= 3.6V; V
0.8
25°C
OUT
40
25°C
DTY (%)
VEN/SS (Volts)
(1-D) (%)
= 16V; FPWM = 10kHz
1.0
55
50
OUT
-40°C
1.2
= 16V
65
60
85°C
1.4
75
70
1.6
85°C
80
85
1.8
90
2.0
95
100
2.2
10
16.0
14.0
12.0
10.0
8.0
6.0
4.0
2.0
700
650
600
550
500
450
400
350
300
250
200
22
20
18
16
14
12
10
8
6
4
2
0
-40
0.0
0
Output Voltage vs. EN/SS Voltage vs. Temperature,
40°C
0.4
10
LED Current vs. PWM Dimming Duty Cycle
Switch Current Limit vs. Temperature vs.
-20
V
60%
0.8
IN
Complementary Duty Cycle (1-D)
20
= 3.6V; V
0
V
1.2
30
IN
85°C
Temperature (Deg. C)
90%
= 3.6V; V
OUT
1.6
40
25°C
20
VEN/SS (Volts)
= 16V; FPWM = 1kHz
DTY (%)
2.0
50
OUT
= 16V
40
40%
2.4
60
10%
PRELIMINARY
2.8
70
60
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20%
3.2
80
SC4509
80
3.6
90
100
100
4.0