DescriptionPartFootprintManufacturerQuantityC11 F, 10VCapacitorGRM155R61A105KE150402Murata1C2, C40.1 F, 16VCapacitorsGRM155R71C104KA880402Murata2C3, C60.01 F, 25VCapacitorsGRM155R71E103KA01D0402Murata2C5, C80.1 F, 100VCapacitorsGCM21BR72A104KA37L0805Murata2C70CapacitorOpen0402Open1D1100V, 150mASchottky diodeBAT46W-7-FSOD-123Diodes Inc.1L14.7 HInductorME3220-472MLB3mm x 3mmCoilcraft1R1348kResistorSMD, 1%, 0.125W0402Vishay1R26.34kResistorSMD, 1%, 0.125W0402Vishay1R3, R610kResistorsSMD, 1%, 0.125W0402Vishay2R4100ResistorSMD, 1%, 0.125W0402Vishay1R53.16kResistorSMD, 1%, 0.125W0402Vishay1U1MAX15031Boost converterMAX15031ATE+16-TQFN-EPMaxim1 Waveforms Depicting the Performance of the DesignFigure 2Page 2 of 9that the converter is operating in a discontinuous mode of operation. Th e circuit is designed for a 70V output (VOUT) while the input (VIN) is kept at 3.3V. Figure 2. VIN (Channel 3), VOUT (Channel 2), and APD (Channel 1) at 3.3V input. Page 3 of 9 Figure 3. LX node voltage (Channel 1) specifications for this reference design are listed below, along wit h a detailed schematic (of materials ( Design Specifications and SetuplWide, 2.7V to 11V input supply-voltage range l70V output voltage l4mA output current lFixed, 400kHz switching frequency l-40 C to +125 C operating temperature range lTiny, 8mm x 12mm circuit footprint Schematic of the Reference DesignFigure 1 presents the reference design schematic for a 2.7V to 5.5V inpu t range. The same circuit can be used for inputs from 5.5V to 11V by connecting the CP pin to VIN and removing the charge-pump capacitor (C3). Page 1 of 9 Figure 1. Schematic of the MAX15031 boost converter for FSW = 400kHz (fixed). Table 1. Bill of Materials (BOM)DesignatorValueDescriptionPartFootprintManufacturerQuantityC11 F, 10VCapacitorGRM155R61A105KE150402Murata1C2, C40.1 F, 16VCapacitorsGRM155R71C104KA880402Murata2C3, C60.01 F, 25VCapacitorsGRM155R71E103KA01D0402Murata2C5, C80.1 F, 100VCapacitorsGCM21BR72A104KA37L0805Murata2C70CapacitorOp MaximApp NotesPower-Supply CircuitsKeywords: M