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PCA9450 데이터시트(PDF) 58 Page - NXP Semiconductors

부품명 PCA9450
상세설명  Power management IC for i.MX 8M application processor family
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제조업체  NXP [NXP Semiconductors]
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PCA9450 데이터시트(HTML) 58 Page - NXP Semiconductors

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NXP Semiconductors
PCA9450
Power management IC for i.MX 8M application processor family
PCA9450
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2019. All rights reserved.
Product data sheet
Rev. 1.0 — 19 November 2019
58 / 96
9.2 Typical application
Please follow the recommendations below for your schematic/PCB layout design:
• 1 μF bypass capacitor on VINT and VSYS, located as close as possible to those pins to
ground
• Input capacitors must be present on the INB and INL supplies if used
• Output inductors and capacitors must be used on the outputs of the BUCK converters if
used
• Output capacitors must be used on the outputs of the LDOs
9.2.1 Buck regulators
9.2.1.1 Inductor selection for buck converters
Each of the converters on PCA9450 typically uses a 0.47 μH output inductor which
has to be rated for its DC resistance and saturation current. The DC resistance of the
inductance influences directly the efficiency of the converter. Therefore, an inductor with
lowest DC resistance must be selected for highest efficiency.
Equation 1 calculates the maximum inductor current under static load conditions. The
saturation current of the inductor must be rated higher than the maximum inductor
current as calculated with Equation 2. This is needed because during heavy load
transient the inductor current rises above the calculated value.
(1)
(2)
Where
• f = switching frequency (2 MHz)
• L = Inductance
• ΔIL = Peak to peak inductor ripple current
• IL.max = Maximum inductor current
A conservative approach is to select the inductor current rating just for the maximum
switch current of the PCA9450
Table 69 shows possible inductors list.
Table 69. Tested inductor list
Buck
Vendor
Part number
Size
DCR [mΩ]
Isat [A]
Itemp [A]
Sunlord
WPN252012HR47MT
2520
29
5.6
4.0
BUCK1, BUCK2,
BUCK3, BUCK4
Murata
1239AS-H-R47M
2520
39
3.8
3.7
BUCK5, BUCK6
Sunlord
WPN201610UR47MT
2016
28
5.0
4.1


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