Four-Phase Buck PWM Controller with Integrated MOSFET Drivers and I2C Interface for Intel VR10, VR11, and AMD Applications

The ISL6322 four-phase PWM control IC provides a precision voltage regulation system for advanced microprocessors. The integration of power MOSFET drivers into the controller IC marks a departure from the separate PWM controller and driver configuration of previous multiphase product families. By reducing the number of external parts, this integration is optimized for a cost and space saving power management solution.

Features

• Integrated Multiphase Power Conversion

  – 2-Phase or 3-Phase Operation with Internal Drivers

  – 4-Phase Operation with External PWM Driver Signal

• Precision Core Voltage Regulation

  – Differential Remote Voltage Sensing

  – ±0.5% System Accuracy Over Temperature

  – Adjustable Reference-Voltage Offset

• Optimal Transient Response

  – Active Pulse Positioning (APP) Modulation

  – Adaptive Phase Alignment (APA)

• Fully Differential, Continuous DCR Current Sensing

  – Accurate Load Line Programming

  – Precision Channel Current Balancing

• I2C Interface

  – Voltage Margining Offset

  – Switching Frequency Adjustment

  – Overvoltage Protection Level Adjustment

  – Selects Adaptive Dead Time Scheme

• User Selectable I2C “Slave Only” Device Address: 1000_110x or 1000_111x

• User Selectable Adaptive Dead Time Scheme

  – PHASE Detect or LGATE Detect for Application Flexibility

• Variable Gate Drive Bias: 5V to 12V

• Multi-Processor Compatible

  – Intel VR10 and VR11 Modes of Operation

  – AMD Mode of Operation

• Microprocessor Voltage Identification Inputs

  – 8-bit DAC

  – Selectable between Intel’s Extended VR10, VR11, AMD 5-bit, and AMD 6-bit DAC Tables

  – Dynamic VID Technology

• Overcurrent Protection

• Multi-Tiered Overvoltage Protection

• Digital Soft-Start

• Selectable Operation Frequency up to 1.5MHz Per Phase

• Pb-Free Plus Anneal Available (RoHS Compliant)