Catalog
2/3/4 Phase Controller for CPU Applications
Key Features
• Meets AMDs Parallel, Serial and Hybrid VR Specifications
• Up to Four VDD Phases and Single-Phase VDDNB Controller
• Dual-Edge PWM for Fastest Initial Response to Transient Loading
• 0.5% DAC Accuracy for 0.8 V to 1.55 V
• VDD and VDD Offset Ranges 0 mV - 800 mV
• Phase-to-Phase IDD Current Balancing
• Lossless Inductor Current Sensing for VDD and VDDNB Outputs
• Supports Load Lines (Droop) for VDD and VDDNB Outputs
• Oscillator Range of 100 kHz - 1 MHz
• Over Voltage Protection and Over Current Protection
Description
AI
The NCP5393B is a multiphase synchronous buck regulator controller designed to power the Core and Northbridge of an AMD microprocessor. The controller has a user configurable two, three, or four phase regulator for the Core and an independent single phase regulator to power the microprocessor Northbridge. The NCP5393B incorporates differential voltage sensing, differential phase current sensing, optional load-line voltage positioning, and programmable VDD and VDDNB offsets to provide accurately regulated power parallel and serial VID AMD processors. Dual-edge multiphase modulation provides the fastest initial response to dynamic load events. This reduces system cost by requiring less bulk and ceramic output capacitance to meet transient regulation specifications. High performance operational error amplifiers are provided to simplify compensation of the VDD and VDDNB regulators. Dynamic Reference Injection further simplifies loop compensation by eliminating the need to compromise between response to load transients and response to VID code changes.
