Voltage conversion circuit schematic

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The LCL7660 is a voltage conversion circuit that consumes a small amount of current. As shown in the figure, only two external capacitors can obtain the same negative output voltage as the input voltage.
The operating voltage range of the LCL7660 is 1.5 to 10V. When it is 6.5V or higher, it is connected to D1. When 6.5V or less, D1 is short-circuited. When the voltage is less than 3.5, the LV terminal is grounded. When the voltage is above 3.5V, the LV terminal is open.