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®
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Data Sheet
Two-Phase Buck PWM Controller with
Integrated MOSFET Drivers for Intel VR11
and AMD Applications
The ISL6313B 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.
One outstanding feature of this controller IC is its
multiprocessor compatibility, allowing it to work with both Intel
and AMD microprocessors. Included are programmable VID
codes for Intel VR11 as well as AMD 5-bit and 6-bit DAC tables.
A circuit 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.
The ISL6313B also includes advanced control loop features
for optimal transient response to load apply and removal.
One of these features is highly accurate, fully differential,
continuous DCR current sensing for load line programming
and channel current balance. Active Pulse Positioning (APP)
Modulation and Adaptive Phase Alignment (APA) are two
other unique features, allowing for quicker initial response to
high di/dt load transients. With this quicker initial response to
load transients, the number of output bulk capacitors can be
reduced, helping to reduce cost.
Integrated into the ISL6313B are user programmable current
sense resistors, which require only a single external resistor
to set their values. No external current sense resistors are
required. Another unique feature of the ISL6313B is the
addition of a dynamic VID compensation pin that allows
optimizing compensation to be added for well controlled
dynamic VID response.
Protection features of this controller IC include a set of
sophisticated overvoltage, undervoltage, and overcurrent
protection. Furthermore, the ISL6313B includes protection
against an open circuit on the remote sensing inputs.
Combined, these features provide advanced protection for the
microprocessor and power system.
November 6, 2008
ISL6313B
FN6809.0
Features
• Integrated Multi-Phase Power Conversion
- 2-Phase or 1-Phase Operation with Internal Drivers
• Precision Core Voltage Regulation
- Differential Remote Voltage Sensing
- ±0.5% System Accuracy Over Temperature
- Adjustable Reference-Voltage Offset
• Optimal Transient Response
- Active Pulse Positioning (APP) Modulation
- Adaptive Phase Alignment (APA)
• Fully Differential, Continuous DCR Current Sensing
- Integrated Programmable Current Sense Resistors
- Accurate Load Line Programming
- Precision Channel Current Balancing
• Variable Gate Drive Bias: 5V to 12V
• Multi-Processor Compatible
- Intel VR11 Mode of Operation
- AMD Mode of Operation
• Microprocessor Voltage Identification Inputs
- 8-Bit DAC
- Selectable between Intel VR11, AMD 5-bit, and AMD
6-bit DAC tables
- Dynamic VID Technology
• Dynamic VID Compensation
• Overcurrent Protection
• Multi-tiered Overvoltage Protection
• Digital Soft-Start
• Selectable Operation Frequency up to 1.5MHz Per Phase
• Pb-Free (RoHS Compliant)
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
TEMP.
RANGE
(°C)
PACKAGE PKG.
(Pb-free) DWG. #
ISL6313BCRZ* 6313B CRZ 0 to +70 36 Ld 6x6 TQFN L36.6x6
ISL6313BIRZ* 6313B IRZ -40 to +85 36 Ld 6x6 TQFN L36.6x6
*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.
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. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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Pinout
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ISL6313B
ISL6313B
(36 LD TQFN)
TOP VIEW
36 35 34 33 32 31 30 29 28
PGOOD 1
VID7 2
VID6 3
VID5 4
VID4 5
VID3 6
VID2 7
VID1 8
VID0 9
37
GND
27 PHASE1
26 UGATE1
25 BOOT1
24 LGATE1
23 PVCC
22 LGATE2
21 BOOT2
20 UGATE2
19 PHASE2
10 11 12 13 14 15 16 17 18
ISL6313B Integrated Driver Block Diagram
PWM
SOFT-START
AND
FAULT LOGIC
GATE
CONTROL
LOGIC
SHOOT-
THROUGH
PROTECTION
PVCC
BOOT
UGATE
20kΩ
PHASE
10kΩ
LGATE
2 FN6809.0
November 6, 2008

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Block Diagram
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RGND
OPEN SENSE
LINE PREVENTION
VSEN
UNDERVOLTAGE
DETECTION
LOGIC
OVERVOLTAGE
DETECTION
LOGIC
ISL6313B
PGOOD
SOFT-START
AND
FAULT LOGIC
EN
0.85V
POWER-ON
RESET
VCC
PVCC
APA
SS
MODE / DAC
SELECT
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
RGND
DVC
REF
FB
COMP
OFS
IOUT
DYNAMIC
VID
D/A
+
+
x2
2kΩ
OCP
I_TRIP
E/A
OFFSET
x1
OCP
VOCP
FS
I_AVG
ADAPTIVE PHASE
ALLIGNMENT
CIRCUITRY
CLOCK AND
MODULATOR
WAVEFORM
GENERATOR
MOSFET
DRIVER
BOOT1
UGATE1
PHASE1
LGATE1
FS
+
-
+
-
PWM1
PWM2
MOSFET
DRIVER
BOOT2
UGATE2
PHASE2
LGATE2
CHANNEL
DETECT
CHANNEL
CURRENT
I_AVG
1
BALANCE
N
CH2
CURRENT
SENSE
+
+
CH1
CURRENT
SENSE
RISEN2
RISEN1
ISEN2-
ISEN2+
RSET
ISEN1+
ISEN1-
GND
3 FN6809.0
November 6, 2008

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Typical Application - ISL6313B
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ISL6313B
FB DVC VSEN RGND +5V VCC
COMP
APA
+5V
VCC
OFS
FS
REF
RSET
BOOT1
UGATE1
PHASE1
LGATE1
ISEN1-
ISEN1+
SS
IOUT
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
PGOOD
EN
GND
ISL6313B
PVCC
BOOT2
UGATE2
PHASE2
LGATE2
ISEN2-
ISEN2+
+12V
+12V
LOAD
4 FN6809.0
November 6, 2008

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ISL6313B
Typical Application - ISL6313B with NTC Thermal Compensation
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FB
DVC
VSEN RGND
+5V VCC
COMP
RSET
APA
+5V
VCC
OFS
FS
REF
BOOT1
UGATE1
PHASE1
LGATE1
ISEN1-
ISEN1+
SS
IOUT
VID7
VID6
VID5
VID4
VID3
VID2
VID1
VID0
PGOOD
EN
GND
ISL6313B
PVCC
BOOT2
UGATE2
PHASE2
LGATE2
ISEN2-
ISEN2+
+12V
+12V
PLACE IN CLOSE
NTC
PROXIMITY
LOAD
5 FN6809.0
November 6, 2008