MP2953B Digital Multi-Phase Controller QFN-40

MP2953B Digital Multi-Phase Controller QFN-40

The MP2953B is a digital multi-phase controller that provides power for the core of the INTEL VR12.5 platform.

Key Specifications

Features

• 6-Phase Digital PWM Controller
• Intel's VR12.5 Compliant
• PMBus Compliant
• Serial VID Interface for Programming and Monitoring
• Pin Programmable SVID registers
• Built-In EEPROM to Store Custom Configurations
• Automatic Loop Compensation
• Less External Components than Conventional Analog Controllers
• Phase-Shedding at Light Load to Provide High Efficiency
• Phase-to-Phase Active Current Balancing

Typical Application Circuit

Applications

• Server Core Voltage
• Graphic Card Core Regulators
• Telecom and Networking Systems

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