ISL6568 Intersil Corporation, ISL6568 Datasheet

ISL6568

Manufacturer Part Number

ISL6568

Description

Two-Phase Buck PWM Controller

Manufacturer

Intersil Corporation

Datasheet

1.ISL6568.pdf (29 pages)

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Download datasheet (718Kb)

Two-Phase Buck PWM Controller with

Integrated MOSFET Drivers for VRM9,

VRM10, and AMD Hammer Applications

The ISL6568 two-phase PWM control IC provides 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.

Outstanding features of this controller IC include

programmable VID codes compatible with Intel

VRM9,VRM10, as well as AMD Hammer microprocessors. 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

positively or negatively offset through the use of a single

external resistor.

A unique feature of the ISL6568 is the combined use of both

DCR and r

positioning (droop) and overcurrent protection are

accomplished through continuous inductor DCR current

sensing, while r

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, undervoltage, and overcurrent

protection. Overvoltage results in the converter turning the

lower MOSFETs ON to clamp the rising output voltage and

protect the microprocessor. The overcurrent protection level

is set through a single external resistor. Furthermore, the

ISL6568 includes protection against an open circuit on the

remote sensing inputs. Combined, these features provide

advanced protection for the microprocessor and power

system.

DS(ON)

current sensing. Load line voltage

current sensing is used for accurate

Data Sheet

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

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

Features

• Integrated Multi-Phase Power Conversion

• Precision Core Voltage Regulation

• Precision Channel Current Sharing

• Accurate Load Line Programming

• Variable Gate Drive Bias: 5V to 12V

• Microprocessor Voltage Identification Inputs

• Overcurrent Protection

• Multi-tiered Overvoltage Protection

• Digital Soft-Start

• Selectable Operation Frequency up to 1.5MHz Per Phase

• Pb-Free Plus Anneal Available (RoHS Compliant)

Pinout

VID12.5

COMP

- 1 or 2-Phase Operation

- Differential Remote Voltage Sensing

- ±0.5% System Accuracy Over Temperature

- Adjustable Reference-Voltage Offset

- Uses Loss-Less r

- Uses Loss-Less Inductor DCR Current Sampling

- Up to a 6-Bit DAC

- Selectable between Intel’s VRM9, VRM10, or AMD

- Dynamic VID-on-the-fly Technology

VDIFF

RGND

VCC

REF

OFS

Hammer DAC codes

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

March 9, 2006

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

DS(ON)

ISL6568 (QFN)

TOP VIEW

GND

Current Sampling

ISL6568

FN9187.4

BOOT1

PHASE1

VID4

VID3

ENLL

PHASE2

BOOT2

UGATE2

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