Datasheet for the Richtek RT8207MZQW, a PWM controller with integrated LDO and reference typically used to generate DDR memory supply and termination voltages on notebooks, supplied as a 393 KB PDF. It describes pin assignments, the S3 and S5 control inputs, soft-start and protection behaviour. When a laptop shows no memory voltage, use it to check the enable inputs, the expected output levels and the switching stage pads, and to confirm the correct pinout before replacing the chip.
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