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AS1325

Data Sheet - A p p l i c a t i o n I n f o r m a t i o n

9 Application Information

Inductor Selection

The control circuitry of the AS1325 permits a wide range of inductor values to be selected – from 4.7 to 22µH; The sys-

tem is optimized for 10µH.

The intended application should dictate the value of L. The trade-off between required PCB surface area and desired

output ripple are the determining factors: smaller values for L require less PCB space, larger values of L reduce output

power will be reduced.

Figure 29. Efficiency Comparison of Different Inductors;

Figure 30. Efficiency Comparison of Different Inductors;

Table 5. Recommended Inductors

Part Number

L

DCR

Current Rating Dimensions (L/W/T)

Manufacturer

MOS6020-103ML

10µH

93m

Ω

1A

6.8x6.0x2.4mm

Coilcraft

www.coilcraft.com

MOS6020-472ML

4.7µH

50m

Ω

1.5A

6.8x6.0x2.4mm

MOS6020-332ML

3.3µH

46m

Ω

1.8A

6.8x6.0x2.4mm

CDRH4D18-100

10µH

200m

Ω

0.61A

6.9x5.0x2.0mm

Sumida

www.sumida.com

CDRH4D18-6R8

6.8µH

200m

Ω

0.76A

6.9x5.0x2.0mm

CR43-6R8

6.8µH

131.2m

Ω

0.95A

4.8x4.3x3.5mm

CDRH4D18-4R7

4.7µH

162m

Ω

0.84A

6.9x5.0x2.0mm

SD0403-6R8M

6.8µH

132m

Ω

0.95A

4.9x4.5x3.2mm

ACT

www.act1.com

SD0403-4R7M

4.7µH

109m

Ω

1.15A

4.9x4.5x3.2mm

68

70

72

74

76

78

80

82

84

86

88

90

92

94

96

0.1

1

10

100

1000

Output Current (mA)

10uH Coi l c r af t (M OS6020-103M L)

10uH Sumi da (CDRH4D18-100)

6. 8uH Sumi da (CR43-6R8)

6. 8uH A CT (SD0403-6R8M -02)

4. 7uH Coi l c r af t (MOS6020-472ML)

4. 7uH Sumi da (CDRH4D18-4R7)

4. 7uH A CT (SD0403-4R7M -02)

3. 3uH Coi l c r af t (MOS6020-332ML)

58

62

66

70

74

78

82

86

90

94

0.1

1

10

100

1000

Output Current (mA)

10uH Coi l c r af t (M OS6020-103M L)

10uH Sumi da (CDRH4D18-100)

6. 8uH Sumi da (CR43-6R8)

6. 8uH A CT (SD0403-6R8M -02)

4. 7uH Coi l c r af t (M OS6020-472M L)

4. 7uH Sumi da (CDRH4D18-4R7)

4. 7uH A CT (SD0403-4R7M -02)

3. 3uH Coi l c r af t (M OS6020-332M L)