isl6308a Intersil Corporation, isl6308a Datasheet

isl6308a

Manufacturer Part Number

isl6308a

Description

Three-phase Buck Pwm Controller With High Current Integrated Mosfet Drivers

Manufacturer

Intersil Corporation

Datasheet

1.ISL6308A.pdf (28 pages)

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Meier Automation Equipment Co., Limited

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isl6308aCRZ

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INTERSIL

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Meier Automation Equipment Co., Limited

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isl6308aCRZ-T

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isl6308aIRZ

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Three-Phase Buck PWM Controller with

High Current Integrated MOSFET Drivers

The ISL6308A 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 two 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 ISL6308A is the combined use of

both DCR and r

positioning and overcurrent protection are accomplished

through continuous inductor DCR current sensing, while

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.

Ordering Information

DS(ON)

ISL6308ACRZ* (Note)

ISL6308AIRZ* (Note)

ISL6308AEVAL1Z

*Add “-T” suffix for tape and reel. Please refer to TB347 for details on reel specifications.

NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte

tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free

products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.

current sensing is used for accurate channel-current

NUMBER

PART

DS(ON)

current sensing. Load line voltage

6308A CRZ

6308A IRZ

Evaluation Platform

MARKING

Data Sheet

PART

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

TEMP. RANGE

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

-40 to +85

0 to +70

(°C)

Features

• Integrated Multi-Phase Power Conversion

• Precision Output Voltage Regulation

• Precision Channel Current Sharing

• Optional Load Line (Droop) Programming

• Variable Gate-Drive Bias - 5V to 12V

• Internal or External Reference Voltage Setting

• Overcurrent Protection

• Multi-tiered Overvoltage Protection

• 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

- 1-, 2-, or 3-Phase Operation

- Differential Remote Voltage Sensing

- ±0.8% System Accuracy Over-Temperature

- ±0.5% System Accuracy Over-Temperature

- Usable for Output Voltages not Exceeding 2.3V

- Adjustable Reference-Voltage Offset

- Uses Loss-Less r

- Uses Loss-Less Inductor DCR Current Sampling

- On-Chip Adjustable Fixed DAC Reference Voltage with

- Reference can be Changed Dynamically

- Can use an External Voltage Reference

- OVP Pin to Drive Optional Crowbar Device

September 9, 2008

(for REF=0.6V and 0.9V)

(for REF=1.2V and 1.5V)

2-bit Logic Input Selects from Four Fixed Reference

Voltages (0.6V, 0.9V, 1.2V, 1.5V)

40 Ld 6x6 QFN (Pb-free)

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

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

PACKAGE

DS(ON)

Current Sampling

ISL6308A

L40.6x6

FN6669.0

DWG. #

PKG.

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