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According to the schematic block diagram,

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the charging tube and the charging chip will reach many chips after the main power supply is converted

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The boost chip will convert the PP_VDD_BOOST power supply,

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and then provide voltage to other circuits

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Next, let's see how the BOOST chip converts the power supply in the circuit diagram

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We open the bitmap software and find the iphone directory锛?

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then open the circuit diagram, bitmap and of component map of the iPhone7 model

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It's troublesome to search for boost power supply in the circuit diagram

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We can find the code for the boost chip in the component diagram

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We can see that its code is U2301

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Then we go to the circuit diagram and search for this code

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The current page is the display of the boost chip in the circuit diagram

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We can see that on the left is the PP_VDD_MAIN power supply input

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The current passes through the boost inductor and reaches the C3 and C4 pads of the chip

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Then B3 B4 are output pads

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The output power supply is called PP_VDD_BOOST

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We can't see the diode inside the chip

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According to the schematic block diagram, PP_VDD_BOOST will power some components

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We can view it in the bitmap

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The chip in yellow in the bitmap is provided with the working voltage by the boost chip

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This kind of capacitor whose line is yellow is the filter capacitor of the power supply

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After we see the yellowing position in the bitmap,

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we can go to the component map to find the

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corresponding component in the corresponding position