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MP1584EN Datasheet(PDF) 11 Page - Monolithic Power Systems |
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MP1584EN Datasheet(HTML) 11 Page - Monolithic Power Systems |
11 / 17 page ![]() 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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