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)