10.1 Ethernet Power
- VDD_3V3 (delivered by the MCP16502 PMIC) for the RGMII digital interface with the SAMA7D65 SiP device.
- VDD_1V1_ETH (delivered by the MIC33153 inductorless DCDC) for the LAN8840 digital core, PLL and analog interface with the outside world.
The functionalities of the MCP16502 PMIC are described in Power Management Unit.
The MIC33153 is a high-efficiency synchronous buck regulator with an internal inductor and HyperLight Load® mode.
HyperLight Load® provides very high efficiency at light loads and ultra-fast transient response, which makes the MIC33153 perfectly suited for supplying the LAN8840 digital core, PLL and analog voltages.
The MIC33153 is supplied externally by 5V_MAIN and its start-up is managed by the MCP16502. When the VDD_3V3 output voltage of the MCP16502 is present, the MIC33153 delivers the VDD_1V1_ETH supply to the LAN8840.
The MIC33153 is available in a 14-pin TDFN (3.0 mm × 3.5 mm) Package.
For more details, refer to the MIC33153 data sheet (See Reference Documents)