3.1.2 Power Management Integrated Circuit

The MCP16502 is a fully-featured PMIC optimized for Microchip MPU devices.

The MCP16502 integrates four DC-DC buck regulators and two auxiliary LDOs, and provides a comprehensive interface to the MPU, which includes an interrupt flag and an I²C interface.

All buck channels can support loads up to 1A. All bucks are 100% duty cycle capable.

Two 300 mA LDOs are provided so that sensitive analog loads can be supported.

The default power channel sequencing is built-in, according to the requirements of the Microchip MPU device.

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.

The MCP16502 is available in a 32-pin 5 mm x 5 mm VQFN package with an operating junction temperature range from –40°C to +125°C. It is AEC-Q100 Grade 2 (T_AMB=105°C) qualified. For more information on the MCP16502, refer to the product web page.

The MCP16502AB comes preset to supply all the voltage rails required by the system:

• 3.3V DC/DC supplies SAMA7G5 I/O pads and devices.
• 1.35V DC/DC supplies SAMA7G5 DDR3 pads (VDDIODDR) and devices.
• 1.1V DC/DC supplies SAMA7G5 core (VDDCORE).
• 1.275V DC/DC supplies SAMA7G5 CPU (VDDCPU).
• 1.8V LDO supplies the SD Card interface and the e.MMC.

The figure below shows the power management scheme.