AS1343 austriamicrosystems AG, AS1343 Datasheet - Page 12

• Manufacturer Part Number: AS1343
• Description: DC-DC Boost Converter
• Manufacturer: austriamicrosystems AG

AS1343
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Inductor Selection
For the external inductor, a 4.7µH or 6.8µH inductor will usually suffice. Minimum inductor size is dependant on the
desired efficiency and output current. Inductors with low core losses and small DCR at 1MHz are recommended. It’s
also recommendet to choose an inductor which can handle at least 1.2A without saturating. The MOS6020 is a very
good choice because the DCR is quite small and the saturation current exeeds 1.2A. For space limiting applications
and input currents below 650mA the EPL2014 can be selected. Efficiency losses due to higher DCR should be consid-
ered. (see
Table 4. Recommended Inductors
Note: For the Efficiency measurements in
Figure 30. Efficiency Comparison of different
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MOS6020-682MLC
MOS6020-472MLC
EPL2014-472MLC
LPS3015-472MLC
LPS4018-682MLC
LPS5030-682ML_
90
80
70
60
50
40
30
20
10
Part Number
0
0.1
Figure 30
Inductors; V
Output Current (mA)
and
1
IN
Figure
= 3V, V
4.7µH
4.7µH
6.8µH
4.7µH
6.8µH
6.8µH
L
31)
OUT
10
= 18V
MOS6020 6.8µH
LPS5030 6.8µH
LPS4018 6.8µH
MOS6020 4.7µH
LPS3015 4.7µH
EPL2014 4.7µH
0.231 Ω
0.200 Ω
0.150 Ω
0.099 Ω
0.078 Ω
0.050 Ω
DCR
Figure 30
100
Revision 1.04
I
SAT
and
@ 20% drop Dimensions (L/W/T)
Figure 31
0.65A
1.56A
1.82A
Figure 31. Efficiency Comparison of different
1.2A
1.3A
1.7A
90
80
70
60
50
40
30
20
10
0
0.1
a MBR0540 diode was used for D
Inductors; V
4.88x4.88x3.0mm
2.2x2.0x1.4mm
3.1x3.1x1.5mm
4.1x4.1x1.8mm
6.0x6.8x2.4mm
6.0x6.8x2.4mm
Output Current (mA)
1
IN
= 3.6V, V
OUT
Coilcraft
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10
= 18V
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Manufacturer
MOS6020 6.8µH
LPS5030 6.8µH
LPS4018 6.8µH
MOS6020 4.7µH
LPS3015 4.7µH
EPL2014 4.7µH
1
.
100
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