3.2.1.4 Power Management

The board power management uses a Microchip PMIC, MCP16502. This is a complete, cost-effective and highly-efficient power management solution, optimized to provide a single-chip power solution and voltage sequencing for Microchip’s MPU series.

The MCP16502AA features:

  • Four DC-DC buck regulators. Each buck channel can support loads up to 1A. Each DC-DC regulator is optimized for its target load, namely:
    • Buck 1: 3.3V for I/Os and other analog loads
    • Buck 2: 1.35V for DDR3L voltage
    • Buck 3: 1.25V for core voltage
    • Buck 4 is unused for this application, can be accessed by users via J3 connector.
  • Two 300 mA LDOs, 2.5V for VDDFUSE and 3.3V for RGB LEDs
  • Support of Hibernate, Low-Power and High-Performance modes
  • Interrupt flag, control PIOs and I2C interface

The default power channel sequencing is built-in, according to the requirements of the MPU. A dedicated pin (LPM) facilitates the transition to Low-Power modes. The MCP16502 features a low no-load operational quiescent current and draws less than 10 µA in full shutdown. Active discharge resistors are provided on each output. All buck channels support safe start-up into pre-biased outputs.