1.9.2 MCP16501 PMIC

MCP16501 is a 4-channel PMIC designed for PCB area constrained applications. In a 4x4mm QFN24 package, it features three 1A DC-DC buck regulators and one 0.3A auxiliary LDO regulator, and provides a simple, leakage-free interface with SAM9X7.

The following figure shows an application schematic example of a SAM9X7 device with a DDR3L-SDRAM system, powered by MCP16501A. This variant is specifically tailored for SAM9X7 systems with CPU frequency up to 800 MHz. The 3.3V, 1.35V and 1.15V supply rails are fed from DC-DC converters for maximum efficiency. The LDO regulator output LOUT is controlled with the LEN input and its output voltage is set with the resistive divider R3/R4.

For further details, refer to the MCP16501 documentation on www.microchip.com.

Figure 1-5. MCP16501 Simplified Application Block Diagram

Note: The D0 diode implements a wired-OR function to ensure that VDDBU remains supplied even when the backup supply is depleted. The SAM9X7 Series device cannot operate if VDDBU is outside the specified operating range. This schematic is provided as an example implementation and can be adapted to meet specific application requirements.