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L_min = (5V) x (16V - 5V) / (0.3 x 4A) x 1.2MHz x 16V = 0.00000238715… = 2.387uH
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Since this is close enough to the “Typical L1” listed in the recommend components from the datasheet, the typical L1 value of 21.2uH 8uH will be selected for the application (which happens to be a common E-value, making sourcing easier).
https://www.digikey.ca/en/products/detail/bourns-inc/SRN6045TASRP7028A-2R2Y1R8M/61551024876644
Capacitors
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Following the datasheet recommendation, a 10uF ceramic capacitor was selected from WARG’s existing library (GRM188R61E106KA73J) for the input capacitor. It comes in an 0603 package and is rated for 25V, which is well above the maximum input voltage of 16V. Another 100nF capacitor was selected as per the datasheet’s recommendation for high frequency filtering.
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For the output capacitors, the datasheet states a typical C_out value of 44uF. To meet this spec, the design includes 2 22uF capacitors.
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Bulk Capacitors
https://www.ti.com/lit/an/slta055slyt670/slta055slyt670.pdf?ts=1726645717845
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Calculating for the bulk capacitor: …1726655175328 (long and complex)
A 22uF aluminum radial capacitor was selected for bulk capacitance.
Feedback Resistors
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5V = 0.6 x (1 + R1/10k)
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