MP2855 Multi-Phase Controller QFN-40

MP2855 Multi-Phase Controller QFN-40

The MP2855 is a dual-loop, digital, multi-phase controller that provides power for the core of the AMD SVI2 2.0 platform.

Key Specifications

Features

• Multi-Phase, Dual-Output, Digital Controller
• AMD SVI2 Compliant
• PMBus/I2C-Compatible (1MHz Bus Speed)
• Configurable Pin for PMBus Address
• Built-In NVM to Store Custom Configurations
• 200kHz to 3MHz Switching Frequency
• Automatic Loop Compensation
• Fewer External Components than a Conventional Analog Controller
• Best Transient Performance with Nonlinear Digital Control
• Flexible Phase Assignment for Dual Rails

Design Notes

• Rail sequencing order and delay are part of the SoC power-up contract; a wrong order latches the processor even though every rail is in spec.
• In multiphase designs, current balance depends on the loop matching between phases, so keep the layout symmetric.
• Digital interfaces (PMBus, I²C) need pull-ups to the correct rail and a defined state during power-up.
• Thermal design is a system problem here: the PMIC sits next to the load it feeds, so budget the shared copper, not the package alone.

Common Questions