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MP1584EN Datasheet(PDF) 11 Page - Monolithic Power Systems

Part # MP1584EN
Description  3A, 1.5MHz, 28V Step-Down Converter
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP1584EN Datasheet(HTML) 11 Page - Monolithic Power Systems

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MP1584 – 3A, 1.5MHz, 28V STEP-DOWN CONVERTER
MP1584 Rev. 1.0
www.MonolithicPower.com
11
8/8/2011
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2011 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
7447789003
3.3
0.024
3.42
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-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-220M3R5
22
0.0316
3.5
12.5x12.5x6.5
Toko
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
B340A-13-F
40V, 3A
Diodes Inc.
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.
For simplification, choose the input capacitor
with RMS current rating greater than half of the
maximum load current.


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