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DATASHEET
Digital Dual Output, 7-Phase Configurable PWM
Controller with Adaptive Voltage Scaling (AVSBus) Bus
ISL68137
The ISL68137 is a digital dual output, flexible multiphase
(X+Y 7) PWM controller with AVSBus (Adaptive Voltage
Scaling interface). The ISL68137 can be configured to support
any desired phase assignments up to a maximum of 7 phases
across the 2 outputs (X+Y). For example, 6+1, 5+2, 4+2, 3+3,
3+2, or even a single output operation as a 7+0 configuration
are supported. The flexible phase arrangement, combined with
PMBus and AVSBus interfaces, allows the device to support
any demanding power supply requirement. The ISL68137 with
AVSBus complements PMBus by providing a common
interface that accelerates point-to-point communication
between the controller and the load to statically and
dynamically control the processor voltage, thus delivering a
balanced and power efficient solution. AVSBus can be used
exclusively once the device is configured via PMBus. The
ISL68137 utilizes Intersil’s proprietary linear synthetic digital
current modulation scheme to achieve the industry’s best
combination of transient response and ease of tuning while
addressing the challenges of modern multiphase designs.
Device configuration and telemetry monitoring is
accomplished using Intersil's intuitive PowerNavigator™ GUI.
The ISL68137 device supports on-chip nonvolatile memory to
store various configuration settings that are user selectable via
pin-strap, giving system designers increased power density to
configure and deploy multiple configurations. The device
supports an automatic phase add/drop feature to allow
maximum efficiency across all load ranges. Thresholds for
automatic phase add/drop are user programmable using the
powerful PowerNavigator™ GUI.
The ISL68137 supports a comprehensive fault management
system to enable the design of highly reliable systems. From a
multitiered overcurrent protection scheme, to the configurable
power-good and output overvoltage/undervoltage fault
thresholds and temperature monitoring, virtually any need is
accommodated.
With minimal external components, easy configuration, robust
fault management and highly accurate regulation capability,
implementing a high performance multiphase regulator has
never been easier.
Applications
• Networking equipment
• Telecom/datacom equipment
• Server/storage equipment
• Point-of-load power supply (Memory, DSP, ASIC, FPGA)
Features
• PMBus 1.3 and AVSBus compliant
- Telemetry - VIN, VOUT, IOUT, power IN/OUT, temperature
and various fault status registers
- Individual AVSBus interface enables high speed voltage
changes
• Advanced linear digital modulation scheme
- Zero latency synthetic current control for excellent HF
current balance
- Dual edge modulation for fastest transient response
• Auto phase add/drop for excellent load vs efficiency profile
• Flexible phase configuration
- 7+0, 6+1, 5+2, 4+3 phase operation
- Operation using less than 7 phases between 2 outputs is
also supported
• Diode braking for overshoot reduction
• Differential remote voltage sensing supports ±0.5% closed
loop system accuracy over load, line and temperature
• Highly accurate current sensing for excellent load line
regulation and accurate OCP
- Supports ISL99227 60A smart power stages
- Supports DCR sense with integrated temperature
compensation
• Supports phase doubler (ISL6617A) for up to 14-phase
operation
• Comprehensive fault management enables high reliability
systems
- Pulse-by-pulse phase current limiting
- Total output current protection
- Output and input OV/UV
- Open voltage sense detect
- Black box recording capability for faults
• Intuitive configuration via PowerNavigator™ GUI
- NVM to store up to 8 configurations
• Pb-free (RoHS compliant)
Related Literature
• For a full list of related documents, visit our website
- ISL68137 product page
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2016. All Rights Reserved
Intersil (and design) and PowerNavigator are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.

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ISL68137
Table of Contents
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Functional Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Driver, DrMOS and Smart Power Stage Recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Internal Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical Application: 6+1 Configuration with ISL99227 SPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical Application: 4+3 Configuration with ISL99227 SPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical Application: 5+2 Configuration with DCR Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Typical Application: Phase Doubler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Typical Performance Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
PWM Modulation Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
PMBus Address Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Phase Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Automatic Phase Add and Drop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Output Voltage Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Switching Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Current Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Temperature Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Temperature Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Lossless Input Current and Power Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Voltage Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Current Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Power-On Reset (POR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Soft-Start Delay and Ramp Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Stored Configuration Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Fault Monitoring and Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Power-Good Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Output Voltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Output Current Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Smart Power Stage OC Fault Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Thermal Monitoring and Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Layout and Design Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
PMBus Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
PMBus Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
PMBus Command Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
PMBus Use Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
PMBus Data Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
PMBus Command Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Adaptive Voltage Scaling (AVSBus) Functionality and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
AVSBus Master Send Subframe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
AVSBus Slave Response Subframe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
AVSBus Command Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
About Intersil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
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ISL68137
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP. RANGE
(°C)
PACKAGE
(RoHS COMPLIANT)
PKG.
DWG. #
ISL68137IRAZ
ISL68137 IRZ
-40 to +85
48 Ld 6x6 QFN
L48.6x6B
NOTES:
1. Add “-T” suffix for 4k unit or “-T7A” suffix for 250 unit tape and reel options. Please refer to TB347 for details on reel specifications.
2. 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.
3. For Moisture Sensitivity Level (MSL), please see product information page for ISL68137. For more information on MSL please see techbrief TB363.
PART NUMBER
ISL68137
ISL68134
ISL68127
ISL68124
Pin Configuration
TABLE 1. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
PHASE CONFIGURATION
OUTPUT X/OUTPUT Y
SPECIFICATION SUPPORTED
X+Y 7
PMBus/AVSBus
X+Y 4
PMBus/AVSBus
X+Y 7
PMBus
X+Y 4
PMBus
PACKAGE
QFN 48 Ld, 6x6mm
TQFN 40 Ld, 5x5mm
QFN 48 Ld, 6x6mm
TQFN 40 Ld, 5x5mm
ISL68137
(48 LD QFN)
TOP VIEW
PWM0 1
PWM1 2
PWM2 3
PWM3 4
PWM4 5
PWM5 6
PWM6 7
AVS_CLK 8
AVS_SDA 9
AVS_MDA 10
AVS_VDDIO 11
DNC 12
48 47 46 45 44 43 42 41 40 39 38 37
36 CS1
35 CSRTN1
34 CS2
33 CSRTN2
32 CS3
GND
(EPAD)
31 CSRTN3
30 CS4
29 CSRTN4
28 CS5
27 CSRTN5
26 CS6
25 CSRTN6
13 14 15 16 17 18 19 20 21 22 23 24
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ISL68137
Functional Pin Descriptions Refer to Table 4 on page 21 for design layout considerations.
PIN NUMBER
7, 6, 5, 4, 3, 2, 1
8
9
10
11
12, 46, 47, 48
13
14
15
16
17
18
19
20
21
22
23
24
25, 27, 29, 31,
33, 35, 37
26, 28, 30, 32,
34, 36, 38
39
40
41
42
43
44
45
EPAD
PIN NAME
PWM[6:0]
AVS_CLK
AVS_SDA
AVS_MDA
AVS_VDDIO
DNC
EN0
EN1
TWARN
PG0
PG1
SCL
SDA
SALRT
CONFIG
VINSEN
VSEN1
RGND1
CSRTN[6:0]
CS[6:0]
RGND0
VSEN0
SA
VCC
VCCS
TMON0
TMON1
GND
DESCRIPTION
Pulse width modulation outputs. Connect these pins to the PWM input pins of 3.3V logic compatible Intersil
smart power stages, driver IC(s) or power stages.
AVSBus clock input pin. Connect to ground if not used.
AVSBus data output pin. Leave open if not used.
AVSBus data input pin. Connect to ground if not used.
AVSBus reference voltage input pin. Leave open if not used.
Do not connect any signals to these pins.
Input pin used for enable control of Output 0. Active high. Connect to ground if not used.
Input pin used for enable control of Output 1. Active high. Connect to ground if not used.
Thermal warning flag. This open-drain output will be pulled low in the event of a sensed over-temperature at
TMON pins without disabling the regulators. Maximum pull-up voltage is VCC.
Open-drain power-good indicators for Output 0. Maximum pull-up voltage is VCC.
Open-drain power-good indicators for Output 1. Maximum pull-up voltage is VCC.
Serial clock signal pin for SMBus interface. Maximum pull-up voltage is VCC.
Serial data signal pin for SMBus interface. Maximum pull-up voltage is VCC.
Serial alert signal pin for SMBus interface. Maximum pull-up voltage is VCC.
Configuration ID selection pin. See Table 3 for more details.
Input voltage sense pin. Connect to VIN through a resistor divider (typically 40.2k/10k) with a 10nF decoupling
capacitor.
Positive differential voltage sense input for Output 1. Connect to positive remote sensing point. Connect to
ground if not used.
Negative differential voltage sense input for Output 1. Connect to negative remote sensing point. Connect to
ground if not used.
The CS and CSRTN pins are current sense inputs to individual phase differential amplifiers. Unused phases
should have their respective current sense inputs grounded. The ISL68137 supports smart power stage, DCR and
resistor sensing. Connection details depend on current sense method chosen.
Negative differential voltage sense input for Output 0. Connect to negative remote sensing point. Connect to
ground if not used.
Positive differential voltage sense input for Output 0. Connect to positive remote sensing point. Connect to
ground if not used.
PMBus Address selection pin. See Table 2 on page 13 for more details.
Chip primary bias input. Connect this pin directly to a +3.3V supply with a high quality MLCC bypass capacitor.
Internally generated 1.2V LDO logic supply from VCC. Decouple with 4.7µF or greater MLCC (X5R or better).
Input pin for external temperature measurement at Output 0. Supports diode based temperature sensing as well
as smart power stage sensing. Refer to section “Temperature Compensation” on page 16 for more information.
Input pin for external temperature measurement at Output 1. Supports diode based temperature sensing as well
as smart power stage sensing. Refer to section “Temperature Compensation” on page 16 for more information.
Package pad serves as GND return for all chip functions. Connect directly to system GND plane with multiple
thermal vias.
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ISL68137
Driver, DrMOS and Smart Power Stage Recommendation
INTERSIL PART
NUMBER
ISL99227
ISL99140
ISL6596
ISL6617A
QUIESCENT CURRENT
(mA)
4.85
0.19
0.19
5
GATE DRIVE
VOLTAGE (V)
5
5
5
N/A
NUMBER OF
DRIVERS
Single
Single
Single
N/A
COMMENTS
60A, 5x5 smart power stage
40A, 6x6 DrMOS
Connect ISL6596 VCTRL to 3.3V
Phase doubler with 5V PWM output to be compatible with a 60A DrMOS or
with 60A smart power stage. Supports up to a 14-phase design.
Internal Block Diagram
CS0
CSRTN0
CS1
C SR TN 1
CS2
CSRTN2
CS3
CSRTN3
CS4
C SR TN 4
CS5
C SR TN 6
CS6
C SR TN 6
ADC
ADC
ADC
ADC
ADC
ADC
ADC
VDROOP
VSE N0
RGND0
VSA
ADC
VDROOP
VSE N1
RGND1
VSA
ADC
VINSEN
TMO N0
TMO N1
VCC
VCCS
LDO
CURRENT
AC FB
PID
CURRENT
AC FB
PID
ADC
C YC LE -
CYCLE OCP
C YC LE -
CYCLE OCP
C YC LE -
CYCLE OCP
C YC LE -
CYCLE OCP
C YC LE -
CYCLE OCP
C YC LE -
CYCLE OCP
C YC LE -
CYCLE OCP
SUMMED
OCP
SUMMED
OCP
OV -
+
-
UV +
OV -
+
-
UV +
FAULT AND
TELEMETRY
MANAGER
STATUS
MANAGER
LOOP
MANAGER
CPU
NVM
BLACKBO X
DIG ITAL DUAL
EDGE
MODULATOR
DIG ITAL DUAL
EDGE
MODULATOR
PMBus
INTERFACE
AVSBus
INTERFACE
FIGURE 1. INTERNAL BLOCK DIAGRAM
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5
PG0
PG1
TWARN
EN0
EN1
CONFIG
SA
PWM0
PWM1
PWM2
PWM3
PWM4
PWM5
PWM6
SCL
SDA
SALRT
AVS_CLK
AVS_MDA
AVS_SDA
AVS_VDDIO
FN8757.0
September 27, 2016