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DATASHEET
Digital Dual Output, 7-Phase Configurable, PWM
Controller with PMBus
ISL68127
The ISL68127 is a digital dual output, flexible multiphase
(X+Y 7) PWM controller supporting the latest PMBus 1.3
specifications. Either output can be configured to support any
desired phase assignments up to a maximum of seven phases
across the two 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 ISL68127 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 ISL68127 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 ISL68127 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
• 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
• PMBus 1.3 support
- Telemetry - VIN, VOUT, IOUT, power IN/OUT, temperature,
and various fault status registers
- Up to 1MHz bus interface
• 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 the ISL99227 60A smart power stage
- Supports DCR sense with integrated temperature
compensation
• 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 eight configurations
• Pb-free (RoHS compliant)
Related Literature
• For a full list of related documents, visit our web page
- ISL68127 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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ISL68127
Table of Contents
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Functional Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Driver, DrMOS and Smart Power Stage Recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
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 14-Phase VR with ISL6617A+SPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Typical Performance Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
PWM Modulation Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
PMBus Address Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Phase Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Automatic Phase Add and Drop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Output Voltage Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Switching Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Current Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Temperature Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Temperature Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Lossless Input Current and Power Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Voltage Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Current Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power-On Reset (POR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Soft-Start Delay and Ramp Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Stored Configuration Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Fault Monitoring and Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Power-Good Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Output Voltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Output Current Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Smart Power Stage OC Fault Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Thermal Monitoring and Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Layout and Design Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
PMBus Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
PMBus Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
PMBus Command Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
PMBus Use Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
PMBus Data Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
PMBus Command Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
About Intersil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
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ISL68127
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP. RANGE
(°C)
PACKAGE
(RoHS COMPLIANT)
PKG.
DWG. #
ISL68127IRAZ
ISL68127 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. 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), see product information page for ISL68127. For more information on MSL, 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
ISL68127
(48 LD QFN)
TOP VIEW
PWM0 1
PWM1 2
PWM2 3
PWM3 4
PWM4 5
PWM5 6
PWM6 7
GND 8
DNC 9
GND 10
DNC 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
EPAD
(GND)
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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ISL68127
Functional Pin Descriptions Refer to Table 4 on page 19 for design layout considerations.
PIN NUMBER PIN NAME
DESCRIPTION
7, 6, 5, 4, 3, 2, 1 PWM[6:0] 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.
8, 10
GND Ground pins. Connect directly to system GND plane.
9, 11, 12, 46,
47, 48
DNC Do not connect any signals to these pins.
13 EN0 Input pin used for enable control of Output 0. Active high. Connect to ground if not used.
14 EN1 Input pin used for enable control of Output 1. Active high. Connect to ground if not used.
15 TWARN 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.
16 PG0 Open-drain, power-good indicators for Output 0. Maximum pull-up voltage is VCC.
17 PG1 Open-drain, power-good indicators for Output 1. Maximum pull-up voltage is VCC.
18 SCL Serial clock signal pin for SMBus interface. Maximum pull-up voltage is VCC.
19 SDA Serial data signal pin for SMBus interface. Maximum pull-up voltage is VCC.
20 SALRT Serial alert signal pin for SMBus interface. Maximum pull-up voltage is VCC.
21 CONFIG Configuration ID selection pin. See Table 3 on page 16 for more details.
22 VINSEN Input voltage sense pin. Connect to VIN through a resistor divider (typically 402k/10k) with a 10nF decoupling capacitor.
23 VSEN1 Positive differential voltage sense input for Output 1. Connect to positive remote sensing point. Connect to ground if not
used.
24 RGND1 Negative differential voltage sense input for Output 1. Connect to negative remote sensing point. Connect to ground if not
used.
25, 27, 29, 31, CSRTN[6:0] The CS and CSRTN pins are current sense inputs to individual phase differential amplifiers. Unused phases should have
33, 35, 37
their respective current sense inputs grounded. The ISL68127 supports smart power stage, DCR, and resistor sensing.
26, 28, 30, 32, CS[6:0] Connection details depend on the current sense method chosen.
34, 36, 38
39 RGND0 Negative differential voltage sense input for Output 0. Connect to negative remote sensing point. Connect to ground if not
used.
40 VSEN0 Positive differential voltage sense input for for Output 0. Connect to positive remote sensing point. Connect to ground if
not used.
41 SA PMBus address selection pin. See Table 2 on page 12 for more details.
42 VCC Chip primary bias input. Connect this pin directly to a +3.3V supply with a high quality MLCC bypass capacitor.
43 VCCS Internally generated 1.2V LDO logic supply from VCC. Decouple with 4.7µF or greater MLCC (X5R or better).
44 TMON0 Input pin for external temperature measurement at Output 0. Supports diode based temperature sensing as well as
smart power stage sensing. Refer to “Temperature Compensation” on page 15 for more information.
45 TMON1 Input pin for external temperature measurement at Output 1. Supports diode based temperature sensing as well as
smart power stage sensing. Refer to “Temperature Compensation” on page 15 for more information.
EPAD
GND Package pad serves as GND return for all chip functions. Connect directly to system GND plane with multiple thermal vias.
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
COMMENTS
Single 60A, 5x5 smart power stage
Single 40A, 6x6 DrMOS
Single Connect ISL6596 VCTRL to 3.3V
N/A Phase Doubler with 5V PWM output to be compatible with 60A
DrMOS or with 60A smart power stage. Supports up to a
14-phase design.
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Internal Block Diagram
ISL68127
CS0
CSRTN0
CS1
CSRTN1
CS2
CSRTN2
CS3
CSRTN3
CS4
CSRTN4
CS5
CSRTN6
CS6
CSRTN6
ADC
ADC
ADC
ADC
ADC
ADC
ADC
VDROOP
VSEN0
RGND0
VSA
ADC
VDROOP
VSEN1
RGND1
VSA
ADC
VINSEN
TMON0
TMON1
VCC
VR12
LDO
CURRENT
AC FB
PID
CURRENT
AC FB
PID
ADC
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
SUMMED
OCP
SUMMED
OCP
OV
+
-
UV +
OV -
+
-
UV +
FAULT AND
TELEMETRY
MANAGER
STATUS
MANAGER
LOOP
MANAGER
CPU
NVM
BLACKBOX
DIGITAL
DUAL EDGE
MODULATOR
DIGITAL
DUAL EDGE
MODULATOR
PMBUS
INTERFACE
FIGURE 1. INTERNAL BLOCK DIAGRAM
PG0
PG1
TWARN
EN0
EN1
CONFIG
SA
PWM0
PWM1
PWM2
PWM3
PWM4
PWM5
PWM6
SCL
SDA
SALRT
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