Catalog
Multi-Phase Buck Controller for IMVP8
Key Features
• Meets Intel's IMVP8 Specification
• Current Mode Dual Edge Modulation for Fast Initial Response to Transient Loading
• Dual High Performance Operational Error Amplifier
• One Digital Soft Start Ramp for Both Rails
• Dynamic Reference Injection® (Patent #US07057381)
• Accurate Total Summing Current Amplifier(Patent #US006683441)
• DAC with Droop Feed-forward Injection(Patent Pending)
• Dual High Impedance Differential Voltage and Total Current Sense Amplifiers
• Phase-to-Phase Dynamic Current Balancing
• "Lossless" DCR Current Sensing for Current Balancing
• Summed Compensated Inductor Current Sensing for Droop
• True Differential Current Balancing Sense Amplifiers for Each Phase
• Adaptive Voltage Positioning (AVP)
• Switching Frequency Range of 200KHz – 1.5MHz
• Startup into Pre-Charged Loads while avoiding False OVP
• Vin Feed Forward Ramp Slope
• Over Voltage Protection (OVP) & Under Voltage Protection (UVP)
• Over Current Protection (OCP)
• Dual Power Good Output with Internal Delays
Description
AI
The NCP81243 is a Multi-Phase buck solution is optimized for Intel IMVP8 compatible CPUs with user configurations of 3/2/1+ 2/1 phases, including an option to do 4+1. The controller combines true differential voltage sensing, differential inductor DCR current sensing, input voltage feed-forward, and adaptive voltage positioning to provide accurate regulated power for Desktop applications. The control system is based on Dual-Edge pulse-width modulation (PWM) combined with DCR current sensing providing the fastest initial response to dynamic load events at reduced system cost.
