The power chip of the charging bank is generally 28nm
The manufacturing process of power chip is often expressed by 90nm, 65nm, 40nm, 28nm, 22nm, 14nm.
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The so-called XX nm actually refers to the width of the gate of the complementary oxide-metal semiconductor field-effect transistor formed on the CPU, also known as the gate length. The shorter the gate length, the more transistors can be integrated on the same size wafer - Intel has claimed that when the gate length is reduced from 130nm to 90nm, the area occupied by the transistor will be reduced by half; In the case of chip transistor integration is comparable, the use of more advanced manufacturing processes, the chip area and power consumption is smaller, the lower the cost.