ISL6333A

VR11.1 Three-Phase Buck PWM Controller with Integrated MOSFET Drivers, Droop Pin

Product Status: Mass Production

OVERVIEW

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.

KEY FEATURES

  • Intel VR11.1 Compatible
  • IMON Pin for Output Current Monitoring
  • Power State Indicator (PSI#) Pin for Phase Dropping and Higher Efficiency During Light Load States
  • CPURST_N Input to Eliminate Required Extensive External Circuit for proper PSI# Operation of Intel's Eaglelake Chipset Platform (ISL6333B, ISL6333C Only)
  • Integrated Multi-Phase Power Conversion
  • 3-Phase or 2-Phase Operation with Internal Drivers
  • Precision Core Voltage Regulation
  • Differential Remote Voltage Sensing
  • ±0.5% System Accuracy Over-Temperature
  • Adjustable Reference-Voltage Offset
  • Optimal Transient Response
  • Active Pulse Positioning (APP) Modulation
  • Adaptive Phase Alignment (APA)
  • Fully Differential, Continuous DCR Current Sensing
  • Integrated Programmable Current Sense Resistors
  • Accurate Load Line Programming
  • Precision Channel Current Balancing
  • Gate Voltage Optimization Technology (ISL6333, ISL6333B Only)
  • Power Saving Diode Emulation Mode (ISL6333, ISL6333B Only)
  • Optimized for use with Coupled Inductors
  • Variable Gate Drive Bias: +5V to +12V
  • Microprocessor Voltage Identification Inputs
  • 8-bit VID Input for Selecting VR11 DAC Voltages
  • Dynamic VID Technology
  • 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)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL6333A
Basic Information
Production Status
Mass Production
Max # of Outputs
1
Max # of Phases
3
Input Voltage Min (V)
5
Input Voltage Max (V)
12
Output Voltage Min (V)
0.5
Output Voltage Max (V)
1.6
Output Current Max (A)
100
Bias Voltage Range (V)
4.75 to 5.25
VID
Yes
Parametric Applications
VR11.1
Qualification Level
Standard
Droop
Yes
Integrated MOSFET Driver (s)
Yes
Can Sample
YES
Temperature Range
-40 to +85

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