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ISL6328

Dual PWM Controller For Powering AMD SVI Split-Plane Processors

Intersil 

Dual PWM Controller For Powering AMD SVI Split-Plane

Processors

ISL6328

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).

A precision core voltage regulation system is provided by a

one-to-four-phase PWM voltage regulator (VR) controller. The

integration of two power MOSFET drivers adds flexibility in layout

and reduces the number of external components in the

multi-phase section. A single phase PWM controller with

integrated driver provides a second precision voltage regulation

system for the Northbridge portion of the processor. This

monolithic, dual controller with an integrated driver solution

provides a cost and space saving power management solution.

For applications that benefit from load line programming to reduce

bulk output capacitors, the ISL6328 features temperature

compensated output voltage droop. The multi-phase portion also

includes advanced control loop features for optimal transient

response to load application and removal. One of these features

is highly accurate, fully differential, continuous DCR current

sensing for load line programming and channel current balance.

Dual edge modulation is another unique feature, allowing for

quicker initial response to high di/dt load transients.

The ISL6328 supports Power Savings Mode by dropping the

number of phases when the PSI_L bit is set.

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

June 7, 2011

1

FN7621.1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2011. All Rights Reserved

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

All other trademarks mentioned are the property of their respective owners.

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