NCP81243: Multi-Phase Buck Controller for IMVP8

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.

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
Applications
  • Industrial Servers
  • Embedded Systems Power Management
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
Dual Output 3 & 2 Phase Controller with Single Intel Proprietary InterfaceNCP81243/D (335kB)1Jan, 2017
Package Drawings (1)
Document TitleDocument ID/SizeRevision
QFN52, 6x6, 0.4P485BE (66.0kB)B
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
NCP81243MNTXGActivePb-free Halide freeQFN-52485BE1Tape and Reel2500$0.9
Specifications
ProductTopologyPhasesControl ModeVCC Min (V)VCC Max (V)fSW Typ (kHz)tres Typ (ns)
NCP81243MNTXGStep-Down1/2/3Voltage Mode4.755.25300-1200
Dual Output 3 & 2 Phase Controller with Single Intel Proprietary Interface (335kB) NCP81243
QFN52, 6x6, 0.4P NCP81246