At the heart of electronic devices are semiconductor chips. In order to improve the density of the circuit, the characteristic size of the chip has always been developing towards a decreasing trend, and the electric field strength increases linearly with the reduction of the distance. If the power supply voltage is still the original 5V, the electric field strength generated is enough to break down the chip. Therefore, in this way, the requirements for the power supply voltage of the electronic system have changed, that is, different step-down power supplies are needed. In order to maintain high efficiency while reducing voltage, a step-down switching power supply is generally used.
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At the same time, many electronic systems also need a power supply higher than the power supply voltage, for example, in battery-powered devices, the backlight power supply that drives the LCD display, the ordinary white LED driver, etc., all need to boost the system power supply, which requires the use of the booster switching power supply.