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AS1344

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 recommended 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 exceeds 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 Figure 37 and Figure 38)

Note:

Table 5. Recommended Inductors

Part Number

L

DCR

Manufacturer

EPL2014-472MLC

4.7µH

0.231

Ω

0.65A

2.2x2.0x1.4mm

Coilcraft

www.coilcraft.com

LPS3015-472MLC

4.7µH

0.200

Ω

1.2A

3.1x3.1x1.5mm

LPS4018-682MLC

6.8µH

0.150

Ω

1.3A

4.1x4.1x1.8mm

LPS5030-682ML_

6.8µH

0.099

Ω

1.7A

4.88x4.88x3.0mm

MOS6020-682MLC

6.8µH

0.078

Ω

1.56A

6.0x6.8x2.4mm

MOS6020-472MLC

4.7µH

0.050

Ω

1.82A

6.0x6.8x2.4mm

Figure 37. Efficiency Comparison of different

Figure 38. Efficiency Comparison of different

0

10

20

30

40

50

60

70

80

90

0.1

1

10

100

Output Current (mA)

MOS6020 6.8µH

LPS5030 6.8µH

LPS4018 6.8µH

MOS6020 4.7µH

LPS3015 4.7µH

EPL2014 4.7µH

0

10

20

30

40

50

60

70

80

90

0.1

1

10

100

Output Current (mA)

MOS6020 6.8µH

LPS5030 6.8µH

LPS4018 6.8µH

MOS6020 4.7µH

LPS3015 4.7µH

EPL2014 4.7µH