3.1.2 Power Management Integrated Circuit (PMIC)

The MCP16502 is a comprehensive 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 page on www.microchip.com.

The MCP16502TAB comes preset to supply all the voltage rails required by the system:

• 3.3V DC/DC supplies the SAM9X75 I/O pads and devices (VDD_3V3).
• 1.35V DC/DC supplies the SAM9X75 DDR3L pads (VDDIODDR) and embedded memory device.
• 1.15V DC/DC supplies the SAM9X75 core (VDDCORE).
• 1.15..1.25V DC/DC supplies the SAM9X75 CPU (VDDCPU).

The following figure shows the PMIC implementation.

The two LDO outputs (VLDO1, VLDO2) are available for unrestricted use. Headers J75 and J76 provide access to the LDO outputs.