Monolithic Dual PWM Hybrid Controller Powering AMD SVI Split-Plane and PVI Uniplane Processors

The ISL6323A dual PWM controller delivers high efficiency and tight regulation from two synchronous buck DC/DC converters. The ISL6323A supports hybrid power control of AMD processors which operate from either a 6-bit parallel VID interface (PVI) or a serial VID interface (SVI). The dual output ISL6323A features a multi-phase controller to support uniplane VDD core voltage and a single phase controller to power the Northbridge (VDDNB) in SVI mode. Only the multi-phase controller is active in PVI mode to support uniplane VDD only processors.

Features

• Processor Core Voltage Via Integrated Multi-Phase Power Conversion

• Configuration Flexibility

- 2-Phase Operation with Internal Drivers

- 3- or 4-Phase Operation with External PWM Drivers

• PSI_L Support with Phase Shedding for Improved Efficiency at Light Load

• Serial VID Interface Inputs

- Two Wire, Clock and Data, Bus

- Conforms to AMD SVI Specifications

• Parallel VID Interface Inputs

- 6-bit VID input

- 0.775V to 1.55V in 25mV Steps

- 0.375V to 0.7625V in 12.5mV Steps

• Precision Core Voltage Regulation

- Differential Remote Voltage Sensing

- ±0.6 System Accuracy Over-Temperature

- Adjustable Reference-Voltage Offset

• Optimal Processor Core Voltage Transient Response

- Adaptive Phase Alignment (APA)

- Active Pulse Positioning Modulation

• Fully Differential, Continuous DCR Current Sensing

- Accurate Load Line Programming

- Precision Channel Current Balancing

• Variable Gate Drive Bias: 5V to 12V

• Overcurrent Protection

• Multi-tiered Overvoltage Protection

• Selectable Switching Frequency up to 1MHz

• Simultaneous Digital Soft-Start of Both Outputs

• Processor NorthBridge Voltage Via Single Phase Power Conversion

• Precision Voltage Regulation

- Differential Remote Voltage Sensing

- ±0.6 System Accuracy Over Temperature

• Serial VID Interface Inputs

- Two Wire, Clock and Data, Bus

- Conforms to AMD SVI Specifications

• Overcurrent Protection

• Continuous DCR Current Sensing

• Variable Gate Drive Bias: 5V to 12V

• Simultaneous Digital Soft-Start of Both Outputs

• Selectable Switching Frequency up to 1MHz

• Pb-Free Plus Anneal Available (RoHS Compliant)