P9412 PCB Layout Guide
●The P9412 wireless power TRx (receiver and transmitter) with Wattshare TM technology is an integrated circuit (IC) consisting of multiple high power blocks along with noise sensitive circuits all controlled by a micro-processor (see Figure 1).
●When implementing the circuit onto a printed circuit board (PCB) there are often some trade-offs associated with managing the critical current paths with available routing area. In order to optimize the design, components should be placed based on circuit function to guarantee best performance. Furthermore, the thermal management of the IC is critical to the products overall performance and should be optimized while designing the PCB. The following guidance should be used to implement the design into a PCB using up to six layers, two blind-buried via sets, and 100mm2 surface area: place the components in order of priority based on circuit function, route the power connections near the IC, place and route the noise sensitive connections, and finally, place and route the non-sensitive connections. There are three main categories of circuitry, Power Circuits, Sensitive Circuits, and Non-Sensitive Circuits.
■Key points for optimal layout
●Route power connections wide and on the same side of the PCB as the P9412 (≥ 2.54 mm). Use parallel planes for conductivity improvements.
●Use the layer under the P9412 side of the board as a solid GND plane for “Hot loops”.
●Connect all GND (PGND, CPGND, and GND) pins to multiple GND plane(s) using vias-in-pad. Use additional vias for the PGND and CPGND pins.
●Use > 10 vias for layer transitions of the AC power connections and hot loops (VRECT, AC1, AC2, LC nodes, CPP, CPN, VOUT, and GND).
●Attempt to place the P9412 toward the center of the board. Avoid placing along the PCB edge.
●Place in order: VRECT caps, Cfly caps, BST caps, VOUT caps, CPOUT caps, LDO1P8 / LDO5P0 caps, resonance caps, COM/CM caps, and RCLAMP
●Use minimal trace-to-trace separation for all traces and planes connected to and within 10 mm of the P9412 (0.127mm or 5mils is OK).
●Use low ESR resonance capacitors (Cs) for the WPC LC tank (C0G preferred) and maintain minimum effective capacitance on Vrect and VOUT.
●Follow the placement and routing suggestions (use ≥ ½ -oz. copper foil, non-conductive via-in-pad back-fill material, and NSMD CSP pins).
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wireless power TRx (receiver and transmitter) 、 integrated circuit (IC) |
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Outline Dimension Drawing |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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Jul.14.20 |
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Rev.1.0 |
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3.9 MB |
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