4.2 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, one 0.3A auxiliary LDO regulator, and provides a simple, leakage-free interface with SAMA5D29. MCP16501’s VOUT2 voltage, corresponding to VDDIODDR, is pin-selectable from 1.2V, 1.35V or 1.8V to cover all supported SDRAM memory types. The application's primary rails (3.3V, 1.25V and VDDIODDR) are all fed from DC-DC converters for maximum efficiency.
Two versions of the MCP16501 PMIC are available:
- MCP16501A supports SAMA5D29 systems with CPU frequency up to 500 MHz and using LPSDR-, LPDDR- or DDR2-SDRAM memories (1.8V), or DDR3L-SDRAM memories (1.35V)
- MCP16501D supports SAMA5D29 systems with CPU frequency up to 500 MHz using LPDDR2- or LPDDR3-SDRAM (1.2V and 1.8V). In this case, VOUT2 is set to 1.2V through SELV2 pin level and LOUT to 1.8V through R3 and R4 values.
The figure below gives an application schematic example of a SAMA5D29 with DDR3L-SDRAM system running at a CPU frequency up to 500 MHz, powered by MCP16501A. The LDO regulator output LOUT is started at 2.5V by the connection of the LEN input to the 3.3V power rail, to power the VDDFUSE input of SAMA5D29. The BSR low-power mode of the processor is entered and exited by a combination of the PIOBU0 and the SHDN pins of the processor.
For further details, refer to the MCP16501 documentation on www.microchip.com.
