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MPQ8632 데이터시트(PDF) 28 Page - Monolithic Power Systems

부품명 MPQ8632
상세설명  High Efficiency 18V Synchronous Step-down Converter Family for 4A to 20A
PDF  47 Pages
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제조업체  MPS [Monolithic Power Systems]
홈페이지  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MPQ8632 데이터시트(HTML) 28 Page - Monolithic Power Systems

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MPQ8632 HIGH EFFICIENCY 18V SYNCHRONOUS STEP-DOWN CONVERTER FAMILY FOR 4A TO 20A
MPQ8632 Rev.1.26
www.MonolithicPower.com
28
6/7/2017
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
Where ∆IL is the peak-to-peak inductor ripple
current.
Choose an inductor that will not saturate under
the maximum inductor peak current. The peak
inductor current can be calculated as:
)
V
V
1
(
L
F
2
V
I
I
IN
OUT
SW
OUT
OUT
LP
(28)
Table 2 lists a few highly-recommended high-
efficiency inductors.
Table 2—Inductor Selection Guide
Part Number
Manufacturer
Inductance
(µH)
DCR
(mΩ)
Current
Rating (A)
Dimensions
L x W x H (mm
3)
Switching
Frequency
(kHz)
744325072
Wurth
0.72
1.35
35
10.2 x 10.5 x 4.7
500
FDU1250C-1R0M
TOKO
1
1.72
31.3
13.3 x 12.1 x 5
500
FDA1055-1R5M
TOKO
1.5
2.8
24
11.6 x 10.8 x 5.5
500
744325180
Wurth
1.8
3.5
18
10.2 x 10.5 x 4.7
500
FDA1055-2R2M
TOKO
2.2
3.94
20.6
11.6 x 10.8 x 5.5
500
FDA1055-3R3M
TOKO
3.3
5.92
15.6
11.6 x 10.8 x 5.5
500
HC7-3R9-R
Cooper
3.9
7.9
10.6
13.8 x 13 x 5.5
500
Typical Design Parameter Tables
The following tables include recommended
component values for typical output voltages (1V,
2.5V, 3.3V) and switching frequency (500kHz).
Refer to Tables 3-9 for design cases without
external ramp compensation. And Tables 10-16
are for design cases with external ramp
compensation. An external ramp is not needed
when using high-ESR output capacitors, such as
electrolytic or POSCAPs. Use an external ramp
when using low-ESR capacitors, such as ceramic
capacitors. For cases not listed in this datasheet,
an excel spreadsheet provided by local sales
representatives can assist with the calculations.
Table 3—MPQ8632-4, FSW=500kHz, VIN=12V
VOUT
(V)
L
(μH)
R1
(kΩ)
R2
(kΩ)
R7
(kΩ)
1
1.8
13.3
20
357
2.5
3.3
63.4
20
887
3.3
3.9
91
20
1200
Table 4—MPQ8632-6, FSW=500kHz, VIN=12V
VOUT
(V)
L
(μH)
R1
(kΩ)
R2
(kΩ)
R7
(kΩ)
1
1
13.3
20
357
2.5
2.2
63.4
20
887
3.3
3.3
91
20
1200



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