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MP2365 – 3A, 28V, 1.4MHz STEP-DOWN CONVERTER
MP2365 Rev. 0.91
7/10/2006
www.MonolithicPower.com
7
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
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 whose maximum reverse
voltage rating is greater than the maximum
input voltage, and whose 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
I
IN
V
1
V
1
C
f
V
Output Capacitor
The output capacitor (C2) is required to
maintain the DC output voltage. Ceramic,
tantalum, or low ESR electrolytic capacitors are
recommended.
Low
preferred to keep the output voltage ripple low.
The output voltage ripple can be estimated by:
ESR
capacitors
are
×
×
+
×
×
×
=
2
C
f
8
1
R
V
V
1
L
f
V
V
S
ESR
IN
OUT
S
OUT
OUT
Where L is the inductor value and R
ESR
is the
equivalent series resistance (ESR) value of the
output capacitor.
In the case of ceramic capacitors, the
impedance at the switching frequency is
dominated by the capacitance. The output
voltage ripple is mainly caused by the
capacitance. For simplification, the output
voltage ripple can be estimated by:
×
×
×
×
=
IN
OUT
V
2
S
OUT
V
OUT
V
1
2
C
L
f
8
V
In the case of tantalum or electrolytic
capacitors, the ESR dominates the impedance
at the switching frequency. For simplification,
the output ripple can be approximated to:
ESR
IN
OUT
V
S
OUT
V
×
OUT
R
V
1
L
f
V
×
×
=
The characteristics of the output capacitor also
affect the stability of the regulation system. The
MP2365 can be optimized for a wide range of
capacitance and ESR values.
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