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 (Tamb=105°C) qualified. For more information on the MCP16502, refer to the product web page.

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

• 3.3V DC/DC supplies the SAMA7D65 I/O pads and devices (VDD_3V3).
• 1.35V DC/DC supplies the SAMA7D65 DDR3L pads (VDDIODDR) and embedded memory device.
• 1.15V DC/DC supplies the SAMA7D65 core (VDDCORE).
• 1.15..1.25V DC/DC supplies the SAMA7D65 CPU (VDDCPU).

The following figure shows the PMIC implementation.

The two LDO outputs (VLDO1, VLDO2) are available for unrestricted use.