Multi-Phase Buck Controller for IMVP8

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Overview

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.

  • Industrial Servers
  • Embedded Systems Power Management
  • 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

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NCP81243MNTXG

Active

Pb

A

H

P

QFN-52

1

260

REEL

2500

Y

Step-Down

1/2/3

Voltage Mode

4.75

5.25

300 - 1200

$1.3665

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