Ipkbl-sr 35w Schematic Fix ⚡ Real

Passes through input protection diodes and dual N-channel isolation MOSFETs managed by a charging/input logic IC.

This is the core of your question. Dell, like most major manufacturers, for their consumer motherboards. These are considered internal documents. ipkbl-sr 35w schematic

The input +19V must be converted down to various lower voltages using Synchronous Buck Regulators. The schematic highlights several key PWM (Pulse Width Modulation) controllers and MOSFET stages: Passes through input protection diodes and dual N-channel