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®
ISL6316
Data Sheet
August 31, 2005
FN9227.0
Enhanced 4-Phase PWM Controller with
6-Bit VID Code Capable of Precision
RDS(ON) or DCR Differential Current
Sensing for VR10 Application
The ISL6316 controls microprocessor core voltage regulation
by driving up to 4 synchronous-rectified buck channels in
parallel. Multiphase buck converter architecture uses
interleaved timing to multiply channel ripple frequency and
reduce input and output ripple currents. Lower ripple results in
fewer components, lower component cost, reduced power
dissipation, and smaller implementation area.
Microprocessor loads can generate load transients with
extremely fast edge rates. The ISL6316 features a high
bandwidth control loop and ripple frequencies up to >4MHz to
provide optimal response to the transients.
Today’s microprocessors require a tightly regulated output
voltage position versus load current (droop). The ISL6316
senses current by utilizing patented techniques to measure
the voltage across the on resistance, RDS(ON), of the lower
MOSFETs or DCR of the output inductor during the lower
MOSFET conduction intervals. Current sensing provides the
needed signals for precision droop, channel-current
balancing, and over-current protection. A programmable
internal temperature compensation function is implemented to
effectively compensate for the temperature coefficient of the
current sense element.
A unity gain, differential amplifier is provided for remote
voltage sensing. Any potential difference between remote and
local grounds can be completely eliminated using the remote-
sense amplifier. Eliminating ground differences improves
regulation and protection accuracy. The threshold-sensitive
enable input is available to accurately coordinate the start up
of the ISL6316 with any other voltage rail. Dynamic-VID™
technology allows seamless on-the-fly VID changes. The
offset pin allows accurate voltage offset settings that are
independent of VID setting.
Ordering Information
TEMP.
PART NUMBER (°C)
PACKAGE
PKG.
DWG. #
ISL6316CRZ (Note) 0 to 70 40 Ld 6x6 QFN (Pb-free) L40.6x6
ISL6316IRZ (Note) -40 to 85 40 Ld 6x6 QFN (Pb-free) L40.6x6
*Add “-T” suffix for tape and reel.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100% matte
twinitwhplbawotethwteSr.mnDPinbaaatitonand fPSinbih-sfhree, eweshtoic4ldheUarrine.gcRooopHmeSractioomnsp.liIanntetrasnildPcbo-fmrepeatible
products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
Features
• Precision Multiphase Core Voltage Regulation
- Differential Remote Voltage Sensing
- ±0.5% System Accuracy Over Life, Load, Line and
Temperature
- Adjustable Precision Reference-Voltage Offset
• Precision RDS(on) or DCR Current Sensing
- Accurate Load-Line Programming
- Accurate Channel-Current Balancing
- Differential Current Sense
• Microprocessor Voltage Identification Input
- Dynamic VID™ Technology
- 6-Bit VID Code at 12.5mV per Bit
- 0.8375V to 1.600V Operation Range
• Thermal Monitoring
• Programmable Temperature Compensation
• Threshold-Sensitive Enable Pins to Enable VR and
Ensure Power Sequencing Control
• Overcurrent Protection
• Overvoltage Protection
• 2, 3 or 4 Phase Operation
• Adjustable Switching Frequency up to 1MHz per Phase
• Package Option
- QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad
Flat No Leads - Product Outline
- QFN Near Chip Scale Package Footprint; Improves
PCB Efficiency, Thinner in Profile
• Pb-Free Plus Anneal Available (RoHS Compliant)
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.
Dynamic VID™ is a trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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Pinout
ISL6316
ISL6316 (40-PIN QFN)
TOP VIEW
40 39 38 37 36 35 34 33 32 31
NC 1
VID5 2
VID4 3
VID3 4
VID2 5
VID1 6
VID0 7
GND 8
OFS 9
DAC 10
GND
30 ISEN3+
29 ISEN3-
28 ISEN2-
27 ISEN2+
26 PWM2
25 PWM4
24 ISEN4+
23 ISEN4-
22 ISEN1-
21 ISEN1+
11 12 13 14 15 16 17 18 19 20
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2
FN9227.0
August 31, 2005

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ISL6316CR Block Diagram
VDIFF PGOOD
RGND
VSEN
x1
OVP
+175mV
SS
SOFT-START
AND
FAULT LOGIC
ISL6316
VCC
POWER-ON
RESET (POR)
0.9V
0.9V
CLOCK AND
SAWTOOTH
GENERATOR
PWM
THREE-STATE
EN_VTT
EN_PWR
FS
PWM1
OFS
REF
DAC
OFFSET
VID5
VID4
VID3
VID2
VID1
VID0
COMP
FB
IDROOP
DYNAMIC
VID
D/A
VR_HOT
VR_FAN
THERMAL
MONITORING
PWM
PWM
PWM
E/A
CHANNEL
CURRENT
BALANCE
CHANNEL
DETECT
I_TRIP
OC
1
N
I_AVG
THERMAL
COMPENSATION
GAIN
TEMPERATURE
COMPENSATION
CHANNEL
CURRENT
SENSE
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TCOMP
GND
NC
NC
PWM2
PWM3
PWM4
ISEN1+
ISEN1-
ISEN2+
ISEN2-
ISEN3+
ISEN3-
ISEN4+
ISEN4-
3 FN9227.0
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ISL6316
Typical Application - 4-Phase Buck Converter with RDS(ON) Sensing and External TCOMP
+12V
VCC
BOOT
VIN
UGATE
PVCC
PHASE
PWM
ISL6612
DRIVER
LGATE
NTC
+5V
GND
THERMISTOR
VTT
PGOOD
VID5
VID4
VID3
VID2
VID1
VID0
FB COMP REF
IDROOP
VDIFF
DAC
VSEN
RGND
VCC
EN_VTT
ISL6316
ISEN1+
ISEN1-
PWM1
PWM2
ISEN2+
ISEN2-
PWM3
ISEN3+
ISEN3-
PWM4
ISEN4+
ISEN4-
VR_FAN
VR_HOT
+5V
GND
TM EN_PWR
TCOMP OFS FS SS
ROFS RT
+12V
NTC
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+12V
VCC
BOOT
PVCC
PWM
ISL6612
DRIVER
UGATE
PHASE
LGATE
GND
+12V
VCC
PVCC
BOOT
UGATE
PHASE
PWM
ISL6612
DRIVER
LGATE
GND
VIN
VIN
+12V
VCC
BOOT
PVCC
PWM
ISL6612
DRIVER
UGATE
PHASE
LGATE
GND
VIN
µP
LOAD
4 FN9227.0
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ISL6316
Typical Application - 4-Phase Buck Converter with RDS(ON) Sensing and Integrated TCOMP
+12V
VCC
BOOT
VIN
UGATE
PVCC
PHASE
PWM
ISL6612
DRIVER
LGATE
+5V GND
VTT
PGOOD
VID5
VID4
VID3
VID2
VID1
VID0
FB COMP REF
IDROOP
VDIFF
DAC
VSEN
RGND
VCC
EN_VTT
ISL6316
ISEN1+
ISEN1-
PWM1
PWM2
ISEN2+
ISEN2-
PWM3
ISEN3+
ISEN3-
PWM4
ISEN4+
ISEN4-
VR_FAN
GND
VR_HOT
TM EN_PWR
+5V TCOMP OFS FS SS
+5V
ROFS RF
RS
NTC
+12V
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+12V
VCC
BOOT
PVCC
PWM
ISL6612
DRIVER
UGATE
PHASE
LGATE
GND
VIN
+12V
VCC
PVCC
BOOT
UGATE
PHASE
PWM
ISL6612
DRIVER
LGATE
GND
VIN
+12V
VCC
BOOT
PVCC
PWM
ISL6612
DRIVER
UGATE
PHASE
LGATE
GND
VIN
µP
LOAD
5 FN9227.0
August 31, 2005