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ISL6308

NOT R

ECOM

RECO

MMEN NDED FOR N

DED R

EPLAC EW DESIGN

EMENT

I S L630

PART

DATASHEET

FN9208

Rev 4.00

Sep 30, 2008

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.

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 r

DS(ON)

current sensing. Load line voltage

positioning and overcurrent protection are accomplished

through continuous inductor DCR current sensing, while

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 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 r

DS(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

Page 1 of 28

ISL6308

Ordering Information

PART

NUMBER

(Note)

ISL6308CRZ

ISL6308CRZ-T*

ISL6308IRZ

ISL6308IRZ-T*

ISL6308EVAL1Z

PART

MARKING

ISL6308 CRZ

ISL6308 IRZ

Evaluation Platform

TEMP. RANGE

(°C)

0 to +70

-40 to +85

PACKAGE

(Pb-Free)

40 Ld 6x6 QFN

PKG.

DWG. #

L40.6x6

* 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.

Pinout

ISL6308

(40 LD 6x6 QFN)

TOP VIEW

UGATE1

GND

VSEN

OCSET

ICOMP

DROOP

ISUM

IREF

LGATE3

PVCC3

ISEN3

UGATE3

BOOT1

PHASE1

PHASE2

UGATE2

BOOT2

ISEN2

PVCC2

LGATE2

PHASE3

BOOT3

LGATE1

PGOOD

PVCC1

ISEN1

REF0

ENLL

REF1

OVP

3PH

2PH

DAC

REF

OFST

VCC

COMP

VDIFF

RGND

FN9208 Rev 4.00

Sep 30, 2008

Page 2 of 28

ISL6308

Block Diagram

ICOMP

DROOP

OCSET

PGOOD

OVP

ENLL

ISEN AMP

ISUM

IREF

100µA

0.66V

POWER-ON

RESET

PVCC1

VCC

RGND

VSEN

+1V

BOOT1

UGATE1

GATE

CONTROL

LOGIC

SHOOT-

THROUGH

PROTECTION

SOFT-START

AND

FAULT LOGIC

PHASE1

VDIFF

LGATE1

UVP

0.2V

OVP

CLOCK AND

SAWTOOTH

GENERATOR

PVCC2

BOOT2

UGATE2

GATE

CONTROL

LOGIC

PWM2

OVP



+150mV

x 0.82

PWM1

SHOOT-

THROUGH

PROTECTION

PHASE2



LGATE2

REF1

DAC

REF0

DAC

PWM3

CHANNEL

DETECT

2PH

3PH

PVCC3

BOOT3

REF

E/A

CHANNEL

CURRENT

BALANCE

GATE

CONTROL

LOGIC

SHOOT-

THROUGH

PROTECTION

UGATE3

COMP

PHASE3



OFFSET

CHANNEL

CURRENT

SENSE

OFST

LGATE3

ISEN1

ISEN2

ISEN3

GND

FN9208 Rev 4.00

Sep 30, 2008

Page 3 of 28

ISL6308

Typical Application - ISL6308

+12V

VDIFF

COMP

PVCC1

BOOT1

VSEN

RGND

3PH

2PH

VCC

UGATE1

PHASE1

ISEN1

LGATE1

+5V

OFST

+12V

PVCC2

BOOT2

DAC

UGATE2

ISL6308

REF

PHASE2

ISEN2

LGATE2

REF1

REF0

OVP

PGOOD

+12V

PVCC3

BOOT3

UGATE3

PHASE3

ISEN3

LGATE3

ICOMP

ISUM

LOAD

+12V

GND

ENLL

IREF

DROOP

OCSET

FN9208 Rev 4.00

Sep 30, 2008

Page 4 of 28

ISL6308

Absolute Maximum Ratings

Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V

Supply Voltage, PVCC . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +15V

Absolute Boot Voltage, V

BOOT

. . . . . . . . GND - 0.3V to GND + 36V

Phase Voltage, V

PHASE

. . . . . . . . GND - 0.3V to 15V (PVCC = 12)

GND - 8V (<400ns, 20µJ) to 24V (<200ns, V

BOOT-PHASE

= 12V)

Upper Gate Voltage, V

UGATE

. . . . V

PHASE

- 0.3V to V

BOOT

+ 0.3V

PHASE

- 3.5V (<100ns Pulse Width, 2µJ) to V

BOOT

+ 0.3V

Lower Gate Voltage, V

LGATE

. . . . . . . . GND - 0.3V to PVCC + 0.3V

GND - 5V (<100ns Pulse Width, 2µJ) to PVCC+ 0.3V

Input, Output, or I/O Voltage . . . . . . . . . GND - 0.3V to VCC + 0.3V

Thermal Information

Thermal Resistance (Typical Notes 1, 2)



(°C/W)



(°C/W)

40 Ld QFN Package . . . . . . . . . . . . . .

3.5

Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +150°C

Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C

Pb-Free Reflow Profile. . . . . . . . . . . . . . . . . . . . . . . . .see link below

http://www.intersil.com/pbfree/Pb-FreeReflow.asp

Recommended Operating Conditions

VCC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+5V

5%

PVCC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . +5V to 12V

5%

Ambient Temperature (ISL6308CRZ) . . . . . . . . . . . . . 0°C to +70°C

Ambient Temperature (ISL6308IRZ) . . . . . . . . . . . . .-40°C to +85°C

CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and

result in failures not covered by warranty.

NOTES:



is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See

Tech Brief TB379.

2. For



, the “case temp” location is the center of the exposed metal pad on the package underside.

Electrical Specifications

Recommended Operating Conditions, Unless Otherwise Specified. Parameters with MIN and/or MAX limits are

100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization and are

not production tested.

TEST CONDITIONS

MIN

TYP

MAX

UNITS

PARAMETER

BIAS SUPPLY AND INTERNAL OSCILLATOR

Input Bias Supply Current

Gate Drive Bias Current

VCC POR (Power-On Reset) Threshold

VCC

; ENLL = high

PVCC

; ENLL = high; all gate outputs open, F

= 250kHz

VCC Rising

VCC Falling

0.4

4.25

3.75

4.25

3.75

225

0.8

4.38

3.88

4.38

3.88

250

1.50

66.6

1.2

4.47

4.00

4.47

4.00

275

kHz

PVCC POR (Power-On Reset) Threshold

PVCC Rising

PVCC Falling

Oscillator Frequency

Oscillator Ramp Amplitude (Note 3)

Maximum Duty Cycle (Note 3)

CONTROL THRESHOLDS

ENLL Rising Threshold

ENLL Hysteresis

ENLL Pull-up current

COMP Shutdown Threshold

REFERENCE AND DAC

System Accuracy (DAC = 0.6V, 0.9V)

System Accuracy (DAC = 1.2V, 1.50V)

DAC Input Low Voltage (REF0, REF1)

DAC Input High Voltage (REF0, REF1)

Minimum External Reference (Note 4)

Maximum External Reference (Note 4)

OFS Sink Current Accuracy (Negative Offset)

P-P

0.595

ENLL = 1V

COMP Falling

-0.5

0.1

0.630

-1.4

0.25

0.670

-3.0

0.4

µA

DROOP connected to IREF

-0.8

-0.5

0.8

0.6

1.75

50.0

0.8

0.5

0.4

52.5

µA

REF pin input

OFS

= 30kfrom OFS to VCC

47.5

OFS Source Current Accuracy (Positive Offset) R

OFS

= 10kfrom OFS to GND

FN9208 Rev 4.00

Sep 30, 2008

Page 5 of 28