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PCA9450 데이터시트(PDF) 58 Page - NXP Semiconductors |
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PCA9450 데이터시트(HTML) 58 Page - NXP Semiconductors |
58 / 96 page 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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