SC1408IMSTRT データシートの表示（PDF） - Semtech Corporation
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SC1408IMSTRT Datasheet PDF : 12 Pages
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SC1408
POWER MANAGEMENT
Typical Characteristics
Figs.5 - 8: Maximum output current vs. input voltage and sense resistor value. (Boost Mode)
3.5
Vo=3.3V
3.0
L=22uH
20mOhm
3.5
Vo=5V
3.0
L=22uH
2.5
2.5
25mOhm
2.0
2.0
1.5
35mOhm
1.5
1.0
50mOhm
1.0
0.5
0.0
2.0
2.2
3.5
Vo=12V
3.0
L=22uH
2.5
2.0
1.5
1.0
0.5
0.0
2.0
4.0
2.4
2.6
2.8
Vin (V)
100mOhm
3.0
3.2
6.0
8.0
Vin (V)
20mOhm
25mOhm
35mOhm
50mOhm
100mOhm
10.0
12.0
0.5
0.0
2.0
2.5
4.0
Vo=15V
3.5
L=22uH
3.0
2.5
2.0
1.5
1.0
0.5
0.0
2.0
4.0
3.0
3.5
4.0
Vin (V)
6.0
8.0
10.0
12.0
Vin (V)
Figs.9-11:Efficiency in the Boost Application circuit of Fig.1
100%
Vo=5V
100%
Vo=12V
20mOhm
25mOhm
35mOhm
50mOhm
100mOhm
4.5
5.0
20mOhm
25mOhm
35mOhm
50mOhm
100mOhm
14.0
16.0
90%
90%
80%
70%
60%
1
100%
Vo=15V
90%
Vin=5.0V
Vin=4.0V
Vin=3.3V
Vin=3.0V
10
100
Io (mA)
1000
80%
70%
60%
1
Vin=5.0V
Vin=3.0V
Vin=1.8V
10
100
Io (mA)
1000
80%
70%
Vin=12V
Vin=9.0V
Vin=5.0V
Vin=3.0V
Vin=1.8V
60%
1
10
2005 Semtech Corp.
100
Io (mA)
1000
7
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