SC1408 Semtech Corporation, SC1408 Datasheet - Page 9

• Manufacturer Part Number: SC1408
• Description: LOW VOLTAGE/ BOOST DC-DC CONTROLLER
• Manufacturer: Semtech Corporation

August 22, 2000
© 2000 SEMTECH CORP.
Figs. 5 - 8: Maximum output current vs. input voltage and sense resistor value. (Boost Mode)
Figs. 9-11:Efficiency in the Boost Application circuit of Fig.1
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
100%
100%
90%
80%
70%
60%
90%
80%
70%
60%
2.0
2.0
1
1
Vo=12V
Vo=15V
L=22uH
Vo=5V
Vo=3.3V
L=22uH
2.2
4.0
10
10
2.4
6.0
Io (mA)
Io (mA)
Vin (V)
Vin (V)
2.6
8.0
100
100
2.8
Vin=12V
Vin=9.0V
Vin=5.0V
Vin=3.0V
Vin=1.8V
Vin=5.0V
Vin=4.0V
Vin=3.3V
Vin=3.0V
10.0
LOW VOLTAGE, BOOST DC-DC
CONTROLLER
3.0
20mOhm
25mOhm
35mOhm
50mOhm
100mOhm
100mOhm
20mOhm
25mOhm
35mOhm
50mOhm
1000
1000
12.0
3.2
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
652 MITCHELL ROAD NEWBURY PARK CA 91320
2.0
2.0
100%
90%
80%
70%
60%
Vo=15V
Vo=5V
L=22uH
L=22uH
1
4.0
Vo=12V
2.5
6.0
3.0
10
8.0
Vin (V)
Vin (V)
3.5
Io (mA)
10.0
4.0
100
12.0
Vin=5.0V
Vin=3.0V
Vin=1.8V
4.5
100mOhm
14.0
20mOhm
25mOhm
35mOhm
50mOhm
100mOhm
20mOhm
25mOhm
35mOhm
50mOhm
SC1408
1000
16.0
5.0
9