Dual PWM Controller For Powering AMD SVI Split-Plane Processors

The ISL6328 dual PWM controller delivers high efficiency and tight regulation from two synchronous buck DC/DC converters. The ISL6328 supports power control of AMD processors, which operate from a serial VID interface (SVI). The dual output ISL6328 features a multi-phase controller to support the Core voltage (VDD) and a single phase controller to power the Northbridge (VDDNB).

Features

• Processor Core Voltage Via Integrated Multi-Phase Power Conversion

• Configuration Flexibility

- 1 or 2-Phase Operation with Internal Drivers

- 3 or 4-Phase Operation with External PWM Drivers

• PSI_L Support

- Phase Shedding for Improved Efficiency at Light Load

- Diode Emulation in PSI mode

- Gate Voltage Optimization

• Precision Core Voltage Regulation

- Differential Remote Voltage Sensing

- ±0.6% System Accuracy Over-Temperature

• 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

- Temperature Compensated

• Serial VID interface Handles up to 3.4MHz Clock Rates

• Two Level Overcurrent Protection Allows for High Current Throttling (IDD_SPIKE)

• Multi-tiered Overvoltage Protection

• Selectable Switching Frequency up to 1MHz

• Simultaneous Digital Soft-Start of Both Outputs