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ISL6308

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

Renesas Electronics 

ISL6308

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FN9208

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

Rev 4.00

Sep 30, 2008

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.

Output voltage can be programmed using the on-chip DAC

or an external precision reference. A 2-bit code programs

the DAC reference to one of 4 possible values (0.6V,

0.9V,1.2V and 1.5V). A unity gain, differential amplifier is

provided for remote voltage sensing, compensating for any

potential difference between remote and local grounds. The

output voltage can also be offset through the use of single

external resistor. An optional droop function is also

implemented and can be disabled for applications having

less stringent output voltage variation requirements or

experiencing less severe step loads.

A unique feature of the ISL6308 is the combined use of both

DCR and rDS(ON) current sensing. Load line voltage

positioning and overcurrent protection are accomplished

through continuous inductor DCR current sensing, while

rDS(ON) current sensing is used for accurate channel-current

balance. Using both methods of current sampling utilizes the

best advantages of each technique.

Protection features of this controller IC include a set of

sophisticated overvoltage and overcurrent protection.

Overvoltage results in the converter turning the lower

MOSFETs ON to clamp the rising output voltage and protect

the load. An OVP output is also provided to drive an optional

crowbar device. The overcurrent protection level is set

through a single external resistor. Other protection features

include protection against an open circuit on the remote

sensing inputs. Combined, these features provide advanced

protection for the output load.

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

FN9208 Rev 4.00

Sep 30, 2008

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