Datasheet
ADP2380 Data Sheet
Rev. 0 | Page 16 of 28
For a duty cycle that is larger than 50%, the minimum inductor
value is determined by the following equation:
L(Minimum) =
SW
OUT
f
DV
×
−×
2
)1(
The inductor peak current is calculated using the following
equation:
I
PEAK
= I
OUT
+
2
L
I∆
The saturation current of the inductor must be larger than
the peak inductor current. For the ferrite core inductors with
a quick saturation characteristic, the saturation current rating
of the inductor must be higher than the current-limit threshold of
the switch to prevent the inductor from becoming saturated.
The rms current of the inductor can be calculated by
12
2
2
L
OUT
RMS
I
II
∆
+=
Shielded ferrite core materials are recommended for low core
loss and low EMI. Table 7 lists some recommended inductors.
Table 7. Recommended Inductors
Vendor Part No. Value (µH) I
SAT
(A) I
RMS
(A) DCR (mΩ)
Toko FDVE1040-1R5M 1.5 13.7 14.6 4.6
FDVE1040-2R2M 2.2 11.4 11.6 6.8
FDVE1040-3R3M 3.3 9.8 9.0 10.1
FDVE1040-4R7M
4.7
8.2
8.0
13.8
FDVE1040-6R8M 6.8 7.1 7.1 20.2
FDVE1040-100M 10 6.1 5.2 34.1
Vishay IHLP4040DZ-1R0M-01 1.0 36 17.5 4.1
IHLP4040DZ-1R5M-01 1.5 27.5 15 5.8
IHLP4040DZ-2R2M-01 2.2 25.6 12 9
IHLP4040DZ-3R3M-01 3.3 18.6 10 14.4
IHLP4040DZ-4R7M-01 4.7 17 9.5 16.5
IHLP4040DZ-6R8M-01 6.8 13.5 8.0 23.3
IHLP4040DZ-100M-01 10 12 6.8 36.5
Würth Elektronik 744 325 120 1.2 25 20 1.8
744 325 180
1.8
18
16
3.5
744 325 240 2.4 17 14 4.75
744 325 330 3.3 15 12 5.9
744 325 420 4.2 14 11 7.1
744 325 550 5.5 12 10 10.3