ISL6568 Datasheet

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ISL6568

Data Sheet

July 25, 2005

FN9187.3

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

DS(ON)

current sensing. Load line voltage

positioning (droop) and overcurrent protection are

accomplished through continuous inductor DCR current

sensing, while r

DS(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, 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.

Features

鈥?Integrated Multi-Phase Power Conversion

- 1 or 2-Phase Operation

鈥?Precision Core Voltage Regulation

- Differential Remote Voltage Sensing

-

卤0.5%

System Accuracy Over Temperature

- Adjustable Reference-Voltage Offset

鈥?Precision Channel Current Sharing

- Uses Loss-Less r

DS(ON)

Current Sampling

鈥?Accurate Load Line Programming

- Uses Loss-Less Inductor DCR Current Sampling

鈥?Variable Gate Drive Bias: 5V to 12V

鈥?Microprocessor Voltage Identification Inputs

- Up to a 6-Bit DAC

- Selectable between Intel鈥檚 VRM9, VRM10, or AMD

Hammer DAC codes

- Dynamic VID-on-the-fly Technology

鈥?Overcurrent Protection

鈥?Multi-tiered Overvoltage Protection

鈥?Digital Soft-Start

鈥?Selectable Operation Frequency up to 1.5MHz Per Phase

鈥?Pb-Free Plus Anneal Available (RoHS Compliant)

Pinout

ISL6568 (QFN)

TOP VIEW

UGATE1

25

24

23

22

33

GND

21

20

19

18

17

9

VSEN

10

OCSET

11

ICOMP

12

ISUM

13

IREF

14

LGATE2

15

PVCC

16

ISEN2

BOOT1

PHASE1

VID4

VID3

ENLL

PHASE2

BOOT2

UGATE2

LGATE1

27

PGOOD

ISEN1

26

VID0

VID1

VID2

30

Ordering Information

PART NUMBER*

ISL6568CR

ISL6568CRZ (Note)

ISL6568CRZA

(Note)

ISL6568IR

ISL6568IRZ (Note)

TEMP.

(掳C)

0 to 70

0 to 70

0 to 70

PACKAGE

32 Ld 5x5 QFN

32 Ld 5x5 QFN (Pb-free

with Anneal)

PKG.

DWG. #

L32.5x5

L32.5x5

L32.5x5

L32.5x5

VID12.5

REF

OFS

VCC

COMP

FB

VDIFF

RGND

1

2

3

4

5

6

7

8

32

31

FS

29

28

32 Ld 5x5 QFN (Pb-free) L32.5x5

-40 to 85 32 Ld 5x5 QFN

-40 to 85 32 Ld 5x5 QFN (Pb-free) L32.5x5

ISL6568IRZA (Note) -40 to 85 32 Ld 5x5 QFN (Pb-free

with Anneal)

NOTE: Intersil Pb-free plus anneal products employ special Pb-free

material sets; molding compounds/die attach materials and 100% matte

tin plate termination finish, which are 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.

1

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

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

|

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

Copyright Intersil Americas Inc. 2004, 2005. All Rights Reserved

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

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