Three-Phase Buck PWM Controller with High Current Integrated MOSFET Drivers

The ISL6308 is a three-phase PWM control IC with integrated MOSFET drivers. It provides a precision voltage regulation system for multiple applications including, but not limited to, high current low voltage point-of-load converters, embedded applications and other general purpose low voltage medium to high current applications.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 allows for a cost and space saving power management solution.

Features
• Integrated Multi-Phase Power Conversion
    - 1, 2, or 3-Phase Operation
• Precision Output Voltage Regulation
    - Differential Remote Voltage Sensing
    - ±0.8% System Accuracy Over-Temperature
    (for REF = 0.6V and 0.9V)
    - ±0.5% System Accuracy Over-Temperature
    (for REF = 1.2V and 1.5V)
    - Usable for Output Voltages not Exceeding 2.3V
    - Adjustable Reference-Voltage Offset
• Precision Channel Current Sharing
    - Uses Loss-Less rDS(ON) Current Sampling
• Optional Load Line (Droop) Programming
    - Uses Loss-Less Inductor DCR Current Sampling
• Variable Gate-Drive Bias - 5V to 12V
• Internal or External Reference Voltage Setting
    - On-Chip Adjustable Fixed DAC Reference Voltage with
    2-bit Logic Input Selects from Four Fixed Reference
    Voltages (0.6V, 0.9V, 1.2V, 1.5V)
    - Reference can be Changed Dynamically
    - Can use an External Voltage Reference
• Overcurrent Protection
• Multi-tiered Overvoltage Protection
    - OVP Pin to Drive Optional Crowbar Device
• Selectable Operation Frequency up to 1.5MHz Per Phase
• Digital Soft-Start
• Capable of Start-Up in a Pre-Biased Load
• Pb-Free (RoHS Compliant)

Applications
• High Current DDR/Chipset core voltage regulators
• High Current, Low voltage DC/DC converters
• High Current, Low voltage FPGA/ASIC DC/DC converters