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ADP2381AREZ-R7 Datasheet(PDF) 16 Page - Analog Devices

Part # ADP2381AREZ-R7
Description  20 V, 6 A Synchronous Step-Down
PDF  28 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADP2381AREZ-R7 Datasheet(HTML) 16 Page - Analog Devices

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ADP2381
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:
SW
OUT
f
D
V
×
−
×
2
)
1
(
The inductor peak current is calculated using the following
equation:
2
L
OUT
PEAK
I
I
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 should 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
I
I
∆
+
=
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
FDVE0630-R47M
0.47
15.6
14.1
3.7
FDVE0630-R75M
0.75
10.9
10.7
6.2
FDVE0630-1R0M
1.0
9.5
9.5
8.5
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
Vishay
IHLP3232DZ-R47M-11
0.47
14
25
2.38
IHLP3232DZ-R68M-11
0.68
14.5
22.2
3.22
IHLP3232DZ-1R0M-11
1.0
12
18.2
4.63
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
Wurth 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



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