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MP2355 – 3A, 23V, 380KHz STEP-DOWN CONVERTER
MP2355 Rev. 1.5
5/1/2006
www.MonolithicPower.com
7
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
Table 1—Inductor Selection Guide
Package
Dimensions
(mm)
W
L
Vendor/
Model
Core
Type
Core
Material
H
Sumida
CR75
CDH74
CDRH5D28
CDRH5D28
Sumida (continued)
CDRH6D28
CDRH104R
Toko
D53LC
Type A
D75C
D104C
D10FL
Coilcraft
DO3308
DO3316
Open
Open
Shielded
Shielded
Ferrite
Ferrite
Ferrite
Ferrite
7.0
7.3
5.5
5.5
7.8
8.0
5.7
5.7
5.5
5.2
5.5
5.5
Shielded
Shielded
Ferrite
Ferrite
6.7
10.1 10.0
6.7
3.0
3.0
Shielded
Ferrite
5.0
5.0
3.0
Shielded
Shielded
Open
Ferrite
Ferrite
Ferrite
7.6
10.0 10.0
9.7
7.6
5.1
4.3
4.0
1.5
Open
Open
Ferrite
Ferrite
9.4
9.4
13.0
13.0
3.0
5.1
Output Rectifier Diode
The output rectifier diode supplies the current to
the inductor when the high-side switch is off. To
reduce losses due to the diode forward voltage
and recovery times, use a Schottky diode.
Choose a diode which has a maximum reverse
voltage rating is greater than the maximum
input voltage, and who’s current rating is
greater than the maximum load current. Table 2
lists
example
Schottky
manufacturers.
diodes
and
Table 2—Diode Selection Guide
Diode
Voltage/Current
Rating
30V, 3A
40V, 3A
30V, 3A
40V, 3A
30V, 3A
40V, 3A
Manufacture
SK33
SK34
B330
B340
MBRS330
MBRS340
Diodes Inc.
Diodes Inc.
Diodes Inc.
Diodes Inc.
On Semiconductor
On Semiconductor
Input Capacitor
The input current to the step-down converter is
discontinuous, therefore a capacitor is required
to supply the AC current to the step-down
converter while maintaining the DC input
voltage. Use low ESR capacitors for the best
performance. Ceramic capacitors are preferred,
but tantalum or low-ESR electrolytic capacitors
may also suffice.
Since the input capacitor (C1) absorbs the input
switching current it requires an adequate ripple
current rating. The RMS current in the input
capacitor can be estimated by:
×
1
×
=
IN
OUT
V
IN
OUT
V
LOAD
1
C
V
V
I
I
The worst-case condition occurs at V
IN
= 2V
OUT
,
where:
2
I
I
LOAD
1
C
=
For simplification, choose the input capacitor
whose RMS current rating greater than half of the
maximum load current.
The input capacitor can be electrolytic, tantalum
or ceramic. When using electrolytic or tantalum
capacitors, a small, high quality ceramic
capacitor, i.e. 0.1μF, should be placed as close to
the IC as possible. When using ceramic
capacitors, make sure that they have enough
capacitance to provide sufficient charge to
prevent excessive voltage ripple at input. The
input voltage ripple caused by capacitance can be
estimated by:
×
×
×
=
IN
OUT
V
IN
OUT
V
s
LOAD
IN
V
1
V
1
C
f
I
V
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