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