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It's not powered by a dedicated control chip. The motherboard has a BIOS system with CMOS to store its configuration parameters.
The BIOS is generally phonix software. Press del on a desktop computer and f2 on a laptop.
Power up to the BIOS to start, detect the hardware according to the CMOS Settings in order to find the boot disk, if it is a hard disk, find the boot code on the hard disk, and then hand over to the program on the hard disk to execute.
Boot on the hard disk, jump from mbr, execute stage1, some have stage1.5, then stage2, and then you can load on the system to boot.
power management chip
The power management chip is also known as the power supply IC, also known as pulse width modulation chip (PWM), the main board is called: programmable pulse width modulation chip, mainly responsible for controlling the main power supply of the CPU, generally located near the CPU socket, you can see the model identification.
Common models:
RT Series: RT9238, RT9241...
RC Series: RC5051, RC5057...
LM Series: LM2637, LM2638...
SC Series: SC2643, SC1189...
ISL Series: ISL6524, ISL6556B...
HIP Series: HIP6021, HIP6301...
ADP Series: ADP3168, ADP3418...
AIC Series: AIC1569...
CS Series: CS5165
In desktop power supplies, the most common switching power chip is the TL494 (or KA7500, the two are actually the same).