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MP2467 Datasheet(PDF) 11 Page - Monolithic Power Systems

Part # MP2467
Description  2.5A, 36V, 500kHz Step-Down Converter
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2467 Datasheet(HTML) 11 Page - Monolithic Power Systems

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MP2467 – 2.5A, 36V, 500KHz STEP-DOWN CONVERTER
MP2467 Rev. 1.1
www.MonolithicPower.com
11
1/25/2010
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
Table 1—Inductor Selection Guide
Part Number
Inductance (µH)
Max DCR (Ω) Current Rating (A)
Dimensions
L x W x H (mm
3)
Wurth Electronics
7447789002
2.2
0.019
4
7.3x7.3x3.2
7447789003
3.3
0.024
3.42
7.3x7.3x3.2
7447789004
4.7
0.033
2.9
7.3x7.3x3.2
744066100
10
0.035
3.6
10x10x3.8
744771115
15
0.025
3.75
12x12x6
744771122
22
0.031
3.37
12x12x6
TDK
RLF7030T-2R2
2.2
0.012
5.4
7.3x6.8x3.2
RLF7030T-3R3
3.3
0.02
4.1
7.3x6.8x3.2
RLF7030T-4R7
4.7
0.031
3.4
7.3x6.8x3.2
SLF10145T-100
10
0.0364
3
10.1x10.1x4.5
SLF12565T-150M4R2
15
0.0237
4.2
12.5x12.5x6.5
SLF12565T-220M3R5
22
0.0316
3.5
12.5x12.5x6.5
Toko
FDV0630-2R2M
2.2
0.021
5.3
7.7x7x3
FDV0630-3R3M
3.3
0.031
4.3
7.7x7x3
FDV0630-4R7M
4.7
0.049
3.3
7.7x7x3
919AS-100M
10
0.0265
4.3
10.3x10.3x4.5
919AS-160M
16
0.0492
3.3
10.3x10.3x4.5
919AS-220M
22
0.0776
3
10.3x10.3x4.5
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
diodes
and
manufacturers.
Table 2—Diode Selection Guide
Diodes
Voltage/
Current
Rating
Manufacturer
B240A-13-F
40V, 2A
Diodes Inc.
B340A-13-F
40V, 3A
Diodes Inc.
CMSH2-40M
40V, 2A
Central Semi
CMSH3-40MA
40V, 3A
Central Semi
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:
×
×
=
IN
OUT
IN
OUT
LOAD
1
C
V
V
1
V
V
I
I
The worse case condition occurs at VIN = 2VOUT,
where:
2
I
I
LOAD
1
C =


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