ADP2300-EVALZ Analog Devices Inc, ADP2300-EVALZ Datasheet - Page 18

• Manufacturer Part Number: ADP2300-EVALZ
• Description: Nonsynchronous Step-Down Regulator Eval. Board
• Manufacturer: Analog Devices Inc

Specifications of ADP2300-EVALZ

• Silicon Manufacturer: Analog Devices
• Application Sub Type: Step Down DC/DC Converter
• Kit Application Type: Power Management - Voltage Regulator
• Silicon Core Number: ADP2300
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADP2300/ADP2301
INDUCTOR
The high switching frequency of the ADP2300/ADP2301 allows
the use of small inductors. For best performance, use inductor
values between 2 μH and 10 μH for ADP2301, and use inductor
values between 2 μH and 22 μH for ADP2300.
The peak-to-peak inductor current ripple is calculated using the
following equation:
where:
f
L is the inductor value.
V
V
V
Inductors of smaller values are usually smaller in size and less
expensive, but increase the ripple current and the output voltage
ripple. As a guideline, the inductor peak-to-peak current ripple
should typically be set to 30% of the maximum load current for
optimal transient response and efficiency. Therefore, the inductor
value is calculated using the following equation:
where I
Table 7. Recommended Inductors
Vendor
Coilcraft
Sumida
Cooper Bussmann
Toko
TDK
SW
D
IN
OUT
is the switching frequency.
is the diode forward drop.
is the input voltage.
is the output voltage.
Δ
L
I
=
LOAD(max)
RIPPLE
0
3 .
×
(
V
=
I
IN
is the maximum load current.
LOAD
(
V
−
IN
L
V
(max)
×
−
OUT
Value (μH)
4.7
6.8
10
4.7
4.7
6.8
6.8
10
4.7
6.8
10
4.7
6.8
10
4.7
6.8
10
V
f
sw
×
OUT
)
f
sw
)
×
×
⎛
⎜
⎜
⎝
⎛
⎜
⎜
⎝
V
V
V
V
OUT
OUT
IN
IN
+
+
+
Part No.
LPS6225-472MLC
LPS6225-682MLC
LPS6225-103MLC
CDRH5D28RHPNP-4R7N
CDRH5D16NP-4R7N
CDRH5D28RHPNP-6R8N
CDRH5D16NP-6R8N
CDRH5D28RHPNP-100M
SD53-4R7-R
SD53-6R8-R
DR73-100-R
B1077AS-4R7N
B1077AS-6R8N
B1077AS-100M
VLC5045T-4R7M
VLC5045T-6R8M
VLC5045T-100M
+
V
V
V
V
D
D
D
D
⎞
⎟
⎟
⎠
⎞
⎟
⎟
⎠
Rev. A | Page 18 of 28
The inductor peak current is calculated using the following
equation:
The minimum current rating of the inductor must be greater
than the inductor peak current. For ferrite core inductors with a
quick saturation characteristic, the inductor saturation current
rating should be higher than the switch current-limit threshold
to prevent the inductor from reaching its saturation point. Be
sure to validate the worst-case condition, in which there is a
shorted output, over the intended temperature range.
Inductor conduction losses are caused by the flow of current
through the inductor, which is associated with the internal dc
resistance (DCR). Larger sized inductors have smaller DCR and,
therefore, may reduce inductor conduction losses. However,
inductor core losses are also related to the core material and the
ac flux swing, which are affected by the peak-to-peak induc-
tor ripple current. Because the ADP2300/ADP2301 are high
switching frequency regulators, shielded ferrite core materials
are recommended for their low core losses and low EMI. Some
recommended inductors are shown in Table 7.
I
65
95
105
43
64
61
84
93
59
65
34
46
DCR (mΩ)
39
34
40
58
66
PEAK
=
I
LOAD
(max)
I
3.1
2.7
2.1
3.7
2.15
3.1
1.8
2.45
2.1
1.85
2.47
2.6
2.3
1.8
3.3
2.7
2.1
SAT
+
(A)
Δ
I
RIPPLE
2
Dimensions
L × W × H (mm)
6.0 × 6.0 × 2.4
6.0 × 6.0 × 2.4
6.0 × 6.0 × 2.4
6.2 × 6.2 × 3.0
5.8 × 5.8 × 1.8
6.2 × 6.2 × 3.0
5.8 × 5.8 × 1.8
6.2 × 6.2 × 3.0
5.2 × 5.2 × 3.0
5.2 × 5.2 × 3.0
7.6 × 7.6 × 3.5
7.6 × 7.6 × 4.0
7.6 × 7.6 × 4.0
7.6 × 7.6 × 4.0
5.0 × 5.0 × 4.5
5.0 × 5.0 × 4.5
5.0 × 5.0 × 4.5