Power regulation is governed by the MaxLinear MxL7704 Power Management Integrated Circuit (PMIC). The schematic details how this single chip splits the incoming 5V rail into several sub-rails required by the BCM2711 and on-board peripherals:
MaxLinear MxL7704. PCIe Controller: VIA VL805 bridging PCIe to USB 3.0. Ethernet Transceiver: Broadcom BCM54213PE. Raspberry Pi 4 Model B Full Schematic
The supports dual‑band 2.4/5 GHz 802.11ac Wi‑Fi (Wi‑Fi 5) and Bluetooth 5.0 . It is connected to the BCM2711 through the SDIO interface and also carries the Bluetooth UART signals. The antenna is implemented as a PCB trace antenna (F‑antenna) visible on the bottom layer. Power regulation is governed by the MaxLinear MxL7704
The Pi 4B’s schematic revolves around a few critical ICs (integrated circuits). Understanding their roles and interconnections is the essence of reading the board. Raspberry Pi 4 Model B Full Schematic