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This is the technical term for integration of logic and power microelectronics. Think of a control of the electric windows in your car. You need some logic stuff (to connect to the internal data bus, to receive signals from the sensors that tell if the window is already closed or blocked by, say, the neck of your daughter). To drive the motor, you need power stuff, electronics that works at a higher voltage and/or electrical power. Before you had one logic chip and one power chip, now you use just one. Cheaper. Smaller.

From the semiconductor perspective, this is done by taking your favourite CMOS-process (logic stuff) and adding diffusions to handle higher voltages. These are usually lower doped and go deeper under the surface.

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