The Pi 4 marked the debut of true USB 3.0 support. The schematic shows the controller. This chip sits between the BCM2711 and the USB ports.
: The MXL7704 manages multiple power rails, including synchronous buck converters for the core SoC voltage and linear regulators for sensitive analog components. Raspberry Pi 4 Model B Full Schematic
What makes this interesting is the sheer density of connections. High-speed memory routing requires precise impedance matching and length tuning—something you can't see on the schematic, but the number of lines gives you an appreciation for the engineering required to prevent signal integrity issues. The Pi 4 marked the debut of true USB 3
A Power Management Integrated Circuit that regulates and distributes various voltage rails across the board. : The MXL7704 manages multiple power rails, including
: Broadcom BCM2711, Quad-core Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz or 1.8GHz.