isl6333 Intersil Corporation, isl6333 Datasheet

isl6333

Manufacturer Part Number

isl6333

Description

Three-phase Buck Pwm Controller With Integrated Mosfet Drivers And Light Load Efficiency Enhancements For Intel Vr11.1 Applications

Manufacturer

Intersil Corporation

Datasheet

1.ISL6333.pdf (40 pages)

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Three-Phase Buck PWM Controller with

Integrated MOSFET Drivers and Light

Load Efficiency Enhancements for Intel

VR11.1 Applications

The ISL6333 three-phase PWM family of control ICs provide

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 multi-

phase product families. By reducing the number of external

parts, this integration is optimized for a cost and space

saving power management solution.

The ISL6333 controllers are designed to be compatible with

Intel VR11.1 Applications. Features that make these controllers

compatible include an IMON pin for output current monitoring,

and a Power State Indicator (PSI#) pin for phase dropping and

higher efficiency during light load states. An 8-bit VID input is

used to select the desired output voltage from the VR11 DAC

table. A circuit is provided for remote voltage sensing,

compensating for any potential difference between remote and

local grounds. The output voltage can also be positively or

negatively offset through the use of a single external resistor.

The ISL6333 controllers also include 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. Active Pulse

Positioning (APP) Modulation and Adaptive Phase

Alignment (APA) are two other unique features, allowing for

quicker initial response to high di/dt load transients. With this

quicker initial response to load transients, the number of

output bulk capacitors can be reduced, helping to reduce

cost.

Integrated into the ISL6333 controllers are user-programmable

current sense resistors, which require only a single external

resistor to set their values. No external current sense resistors

are required. Another unique feature of the ISL6333 controllers

is the addition of a dynamic VID compensation pin that allows

optimizing compensation to be added for well-controlled

dynamic VID response.

Protection features of these controller ICs include a set of

sophisticated overvoltage, undervoltage, and overcurrent

protection. Furthermore, the ISL6333 controllers include

protection against an open circuit on the remote sensing inputs.

Combined, these features provide advanced protection for the

microprocessor and power system.

Data Sheet

ISL6333, ISL6333A, ISL6333B, ISL6333C

1-888-INTERSIL or 1-888-468-3774

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

Features

• Intel VR11.1 Compatible

• CPURST_N Input to Eliminate Required Extensive

• Integrated Multi-Phase Power Conversion

• Precision Core Voltage Regulation

• Optimal Transient Response

• Fully Differential, Continuous DCR Current Sensing

• Gate Voltage Optimization Technology (ISL6333,

• Power Saving Diode Emulation Mode (ISL6333, ISL6333B

• Optimized for use with Coupled Inductors

• Variable Gate Drive Bias: +5V to +12V

• Microprocessor Voltage Identification Inputs

• Dynamic VID Compensation

• Overcurrent Protection and Channel Current Limit

• Multi-tiered Overvoltage Protection

• Digital Soft-Start

• Selectable Operation Frequency up to 1.0MHz Per Phase

• Pb-free (RoHS Compliant)

- IMON pin for output current monitoring

- Power State Indicator (PSI#) pin for phase dropping and

External Circuit for proper PSI# Operation of Intel’s

Eaglelake Chipset Platform (ISL6333B, ISL6333C Only)

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

- Differential Remote Voltage Sensing

- ±0.5% System Accuracy Over-Temperature

- Adjustable Reference-Voltage Offset

- Active Pulse Positioning (APP) Modulation

- Adaptive Phase Alignment (APA)

- Integrated Programmable Current Sense Resistors

- Accurate Load Line Programming

- Precision Channel Current Balancing

ISL6333B Only)

Only)

- 8-bit VID Input for selecting VR11 DAC voltages

- Dynamic VID Technology

higher efficiency during light load states

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

April 10, 2008

Intersil (and design) is a registered trademark of Intersil Americas Inc.

FN6520.0

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