DESCRIPTION

· The NCP81105 is a DrMOS supporting controller optimized for Intel® VR12.5 & VR12.6 compatible CPUs.

· It combines differential voltage sensing, inductor DCR current sensing, input voltage feed-forward, and adaptive voltage positioning for accurate power regulation in Desktop and Notebook CPU applications.

· The control system uses Dual-Edge PWM for fast response to dynamic load events and reduced system cost.

· Compatible with DrMOS power stages like NCP5367, NCP5368, NCP5369, and NCP5338.

· Supports single-phase operation during light load for improved system efficiency.

· Features a high-performance operational error amplifier and patented Dynamic Reference Injection for simplified loop compensation.

· Patented Total Current Summing provides accurate current monitoring for droop and digital current monitoring.

FEATURES

· Meets Intel’s VR12.5 Specifications and implements VR12.6 PS4 State and SVID Reporting.

· Mixed Voltage/Current Mode with Dual Edge Modulation for fast transient response.

· High Impedance Differential Voltage Amplifier and Total Current Sense Amplifier.

· True Differential Current Sense Amplifiers for phase current balancing.

· Digital Soft Start Ramp and Dynamic Reference Injection.

· Accurate Total Summing Current Amplifier and "Lossless" Inductor DCR Current Sensing.

· Summed, Thermally Compensated Inductor Current Sensing for Adaptive Voltage Positioning (AVP).

· Fast Output Slew Rate (48 mV/μs for NCP81105, 10 mV/μs for NCP81105H).

· Programmable Slow Slew Rates and reduced Enable to First SVID Command Latency.

· Phase-to-Phase Dynamic Current Balancing and Switching Frequency Range of 280 kHz to 1.5 MHz.

· Starts up into Pre-Charged Loads while Avoiding False OVP.

· Compatible with DrMOS Power Stages and Power-saving Phase Shedding.

· Vin Feed-forward Ramp Slope Compensation and Pin Programming for Internal SVID parameters.

· Output Over Voltage Protection (OVP), Under Voltage Protection (UVP), and Over Current Protection (OCP).

· Power Good Output with Internal Delays and Pb-Free Device.

APPLICATIONS

· Desktop and Notebook Microprocessors.