DATASHEET
ISL68127
FN8748
Rev.2.00
Jul 12, 2019
Digital Dual Output, 7-Phase Configurable, PWM Controller with PMBus
The ISL68127 is a digital dual output, flexible multiphase
(X+Y ≤ 7) PWM controller supporting the latest PMBus V1.3
specifications. The ISL68127can 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 uses the Renesas
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.
You can configure the device and monitor telemetry using the
intuitive Renesas PowerNavigator GUI. The ISL68127 device
supports on-chip nonvolatile memory to store various
configuration settings that are user-selectable through
pin-strap, giving system designers increased power density to
configure and deploy multiple configurations. The automatic
phase add/drop feature allows maximum efficiency across all
load ranges. Thresholds for automatic phase add/drop are
user-programmable using PowerNavigator.
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, almost 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 and datacom equipment
• Server and 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 V1.3 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, and 4+3 phase operation
- Operation using fewer than seven phases between two
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 using PowerNavigator
- 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
FN8748 Rev.2.00
Jul 12, 2019
Page 1 of 48
ISL68127
Table of Contents
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Functional Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Driver, DrMOS, and Smart Power Stage Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PWM Modulation Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PMBus Address Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Phase Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Phase Add and Drop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Voltage Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switching Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lossless Input Current and Power Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-On Reset (POR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Soft-Start Delay and Ramp Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stored Configuration Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
12
12
12
12
13
13
13
13
15
15
16
16
16
16
16
16
Fault Monitoring and Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-Good Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Voltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Current Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Smart Power Stage OC Fault Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Monitoring and Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
17
17
17
18
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
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
FN8748 Rev.2.00
Jul 12, 2019
Page 2 of 48
ISL68127
Ordering Information
PART NUMBER
(Notes 2, 3)
PART
MARKING
TEMP. RANGE
(°C)
TAPE AND REEL
(UNITS) (Note 1)
PACKAGE
(RoHS COMPLIANT)
PKG.
DWG. #
ISL68127IRAZ
ISL68127 IRZ
-40 to +85
-
48 Ld 6x6 QFN
L48.6x6B
ISL68127IRAZ-T
ISL68127 IRZ
-40 to +85
4k
48 Ld 6x6 QFN
L48.6x6B
ISL68127IRAZ-T7A
ISL68127 IRZ
-40 to +85
250
48 Ld 6x6 QFN
L48.6x6B
NOTES:
1. Refer to TB347 for details about reel specifications.
2. These 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). 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 the ISL68127 device page. For more information about MSL, see TB363.
TABLE 1. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
PART NUMBER
PHASE CONFIGURATION
OUTPUT X/OUTPUT Y
SPECIFICATION SUPPORTED
PACKAGE
ISL68127
X+Y ≤ 7
PMBus
QFN 48 Ld, 6x6mm
ISL68137
X+Y ≤ 7
PMBus/AVSBus
QFN 48 Ld, 6x6mm
ISL68134
X+Y ≤ 4
PMBus/AVSBus
TQFN 40 Ld, 5x5mm
ISL68124
X+Y ≤ 4
PMBus
TQFN 40 Ld, 5x5mm
Pin Configuration
FN8748 Rev.2.00
Jul 12, 2019
DNC
DNC
DNC
TMON1
TMON0
VCCS
VCC
SA
VSEN0
RGND0
CS0
CSRTN0
48 LD QFN
TOP VIEW
48
47
46
45
44
43
42
41
40
39
38
37
PWM0
1
36
CS1
PWM1
2
35
CSRTN1
PWM2
3
34 CS2
PWM3
4
33
CSRTN2
PWM4
5
32
CS3
PWM5
6
31 CSRTN3
EPAD
(GND)
PWM6
7
GND
8
29 CSRTN4
DNC
9
28 CS5
30 CS4
13
14
15
16
17
18
19
20
21
22
23
24
SCL
SDA
SALRT
CONFIG
VINSEN
VSEN1
RGND1
25 CSRTN6
PG1
DNC 12
PG0
26 CS6
TWARN
DNC 11
EN1
27 CSRTN5
EN0
GND 10
Page 3 of 48
ISL68127
Functional Pin Descriptions
PIN NUMBER
Refer to Table 4 on page 19 for design layout considerations.
PIN NAME
DESCRIPTION
1, 2, 3, 4, 5, 6, 7 PWM[6:0] Pulse-width modulation (PWM) outputs. Connect these pins to the PWM input pins of 3.3V logic-compatible Renesas
smart power stages, driver IC(s), or power stages.
8, 10
GND
Ground pins. Connect directly to a system GND plane.
9, 11, 12, 46,
47, 48
DNC
Do not connect any signals to these pins.
13
EN0
Input pin used as the Output 0 enable control. Active high. Connect to ground if not used.
14
EN1
Input pin used as the Output 1 enable control. Active high. Connect to ground if not used.
15
TWARN
Thermal warning flag. This open-drain output is pulled low without disabling the regulators if the TMON pins sense an
over-temperature event. 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 the SMBus interface. Maximum pull-up voltage is VCC.
19
SDA
Serial data signal pin for the SMBus interface. Maximum pull-up voltage is VCC.
20
SALRT
Serial alert signal pin for the 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 40.2k/10k) with a 10nF decoupling capacitor.
23
VSEN1
Positive differential voltage sense input for Output 1. Connect to a positive remote sensing point. Connect to ground if not
used.
24
RGND1
Negative differential voltage sense input for Output 1. Connect to a 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. Ground the current sense
33, 35, 37
input of unused phases. The ISL68127 supports smart power stage, DCR, and resistor sensing. Connection details
26, 28, 30, 32,
CS[6:0] depend on the current sense method chosen.
34, 36, 38
39
RGND0
Negative differential voltage sense input for Output 0. Connect to a negative remote sensing point. Connect to ground if
not used.
40
VSEN0
Positive differential voltage sense input for for Output 0. Connect to a 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 a 4.7µF or greater MLCC (X5R or better).
44
TMON0
Input pin for external temperature measurement at Output 0. Supports diode-based temperature sensing and 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 and smart
power stage sensing. Refer to “Temperature Compensation” on page 15 for more information.
EPAD
GND
The package pad serves as the GND return for all chip functions. Connect directly to the system GND plane with multiple
thermal vias.
Driver, DrMOS, and Smart Power Stage Recommendations
QUIESCENT CURRENT (mA)
GATE
DRIVE VOLTAGE (V)
NUMBER OF
DRIVERS
ISL99227
4.85
5
Single
60A, 5x5 smart power stage
ISL99140
0.19
5
Single
40A, 6x6 DrMOS
ISL6596
0.19
5
Single
Connect ISL6596 VCTRL to 3.3V
ISL6617A
5
N/A
N/A
PART NUMBER
FN8748 Rev.2.00
Jul 12, 2019
COMMENTS
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.
Page 4 of 48
ISL68127
Internal Block Diagram
CS0
CSRTN0
ADC
CYCLECYCLE OCP
ADC
CYCLECYCLE OCP
ADC
CYCLECYCLE OCP
ADC
CYCLECYCLE OCP
CS1
CSRTN1
CS2
CSRTN2
CS3
CSRTN3
CS4
CSRTN4
ADC
CYCLECYCLE OCP
ADC
CYCLECYCLE OCP
ADC
CYCLECYCLE OCP
CS5
CSRTN6
CS6
CSRTN6
ISUM-0
SUMMED
OCP
PG0
STATUS
MANAGER
PG1
TWARN
EN0
LOOP
MANAGER
EN1
CONFIG
CPU
SA
NVM
BLACKBOX
RGND0
VSA
ADC
SUMMED
OCP
OV
‐
+
VDROOP
VSEN1
RGND1
VSA
ADC
CURRENT
AC FB
UV
+
PID
OV
VINSEN
UV
+
DIGITAL DUAL
EDGE
MODULATOR
ADC
VCC
+
LDO
FAULT AND
TELEMETRY
MANAGER
PWM1
PWM2
PWM3
PWM4
PWM5
PWM6
SCL
TMON0
TMON1
PWM0
DIGITAL DUAL
EDGE
MODULATOR
PID
PHASE MANAGER
VSEN0
ISUM-1
CURRENT
AC FB
VDROOP
PMBUS
INTERFACE
SDA
SALRT
VR12
FIGURE 1. INTERNAL BLOCK DIAGRAM
FN8748 Rev.2.00
Jul 12, 2019
Page 5 of 48
ISL68127
Typical Application: 6+1 Configuration with ISL99227 SPS
RGND0
VSEN0
1k
EN0
VCCS
PG0
4.7µF
100
TMON0
3.3V
ISL99227
VCC
PWM0
CSRTN0
PWM
100
CS0
0.1µF
470pF
IMON
REFIN
5V
PVCC
VCC
TMON
470pF
4.7µF
12V
VIN
BOOT
0.1µF
2x22µF
PHASE
FAULT#
12V
GND
SW
ISL99227
40.2k
PWM1
CSRTN1
0.01µF
PWM
100
CS1
0.1µF
470pF
IMON
REFIN
5V
PVCC
VCC
TMON
VINSEN
10k
VOUT0
12V
VIN
BOOT
COUT
0.1µF
2x22µF
PHASE
FAULT#
ISL68127
GND
SW
ISL99227
CS2
CSRTN2
PWM
100
0.1µF
470pF
IMON
REFIN
5V
PVCC
VCC
TMON
PWM2
VIN
BOOT
12V
0.1µF
2x22µF
PHASE
FAULT#
GND
SW
ISL99227
CSRTN3
PWM
100
CS3
0.1µF
470pF
IMON
REFIN
5V
PVCC
VCC
TMON
PWM3
12V
VIN
BOOT
0.1µF
2x22µF
PHASE
FAULT#
GND
SW
ISL99227
CSRTN4
PWM
100
CS4
TWARN
0.1uF
470pF
FAULT#
0.1µF
2x22µF
VOUT1
COUT
GND
SW
ISL99227
SDA
SA
BOOT
PHASE
SCL
SALRT
12V
VIN
IMON
REFIN
5V
PVCC
VCC
TMON
PWM4
CS5
CSRTN5
PWM
100
0.1uF
470pF
IMON
REFIN
TMON1
CS6
12V
0.1µF
2x22µF
GND
SW
ISL99227
PWM
100
CSRTN6
470pF
IMON
0.1µF
REFIN
5V
PVCC
VCC
TMON
470pF
PWM6
VIN
BOOT
PHASE
FAULT#
CONFIG
5V
PVCC
VCC
TMON
PWM5
12V
VIN
BOOT
0.1µF
2x22µF
PHASE
FAULT#
GND
SW
PG1
1k
EN1
RGND1
VSEN1
FIGURE 2. TYPICAL APPLICATION: 6+1 CONFIGURATION WITH ISL99227 SPS
FN8748 Rev.2.00
Jul 12, 2019
Page 6 of 48
ISL68127
Typical Application: 4+3 Configuration with ISL99227 SPS
RGND0
VSEN0
1k
EN0
VCCS
PG0
4.7µF
100
TMON0
ISL99227
VCC
3.3V
4.7µF
PWM0
PWM
100
CS0
CSRTN0
PVCC
VCC
TMON
470pF
0.1µF
470pF
IMON
REFIN
5V
VIN
BOOT
12V
0.1µF
2x22µF
PHASE
FAULT#
12V
GND
SW
ISL99227
40.2k
PVCC
VCC
TMON
VINSEN
PWM1
10k
100
CS1
CSRTN1
0.01µF
PWM
0.1µF
470pF
VIN
IMON
REFIN
5V
BOOT
12V
0.1µF
2x22µF
PHASE
FAULT#
ISL68127
GND
SW
ISL99227
CS2
CSRTN2
PWM
100
0.1µF
470pF
IMON
REFIN
COUT
12V
VIN
BOOT
VOUT0
5V
PVCC
VCC
TMON
PWM2
0.1µF
2x22µF
PHASE
FAULT#
GND
SW
ISL99227
PVCC
VCC
TMON
PWM3
100
CS3
CSRTN3
PWM
0.1µF
470pF
VIN
IMON
REFIN
5V
BOOT
12V
0.1µF
2x22µF
PHASE
FAULT#
GND
SW
ISL99227
CSRTN4
PWM
100
CS4
TWARN
0.1µF
470pF
IMON
REFIN
5V
PVCC
VCC
TMON
PWM4
12V
VIN
BOOT
0.1µF
2x22µF
PHASE
FAULT#
SCL
SA
SW
ISL99227
SDA
SALRT
GND
CSRTN5
PWM
100
CS5
0.1µF
470pF
IMON
REFIN
TMON1
GND
2x22µF
SW
PWM
100
IMON
470pF
0.1µF
REFIN
5V
PVCC
VCC
TMON
CS6
CSRTN6
0.1µF
ISL99227
470pF
PWM6
12V
VIN
BOOT
VOUT1
COUT
PHASE
FAULT#
CONFIG
5V
PVCC
VCC
TMON
PWM5
12V
VIN
BOOT
0.1µF
2x22µF
PHASE
FAULT#
GND
SW
PG1
1k
EN1
RGND1
VSEN1
FIGURE 3. TYPICAL APPLICATION: 4+3 CONFIGURATION WITH ISL99227 SPS
FN8748 Rev.2.00
Jul 12, 2019
Page 7 of 48
ISL68127
Typical Application: 5+2 Configuration with DCR Sensing
RGND0
VSEN 0
1k
EN0
VCCS
THDN
0.1 µF
PWM0
3 .3V
BOOT
ISL99140
PHASE
PWM
5V
PVCC
VCC
EN
PG0
VIN
12 V
2x 22µF
SW
GND
VCC
CS0
4 .7µF
CSRTN0
TMON0
THDN
40.2k
0.1 µF
VINSEN
ISL99140
PHASE
PWM
PWM1
10k
BOOT
5V
PVCC
VCC
EN
12V
GND
12 V
VIN
VOUT0
C OUT
2x 22uF
SW
CS1
CSRTN1
0.01µF
PVCC
VCC
EN
ISL68127
THDN
0.1 µF
PWM2
BOOT
ISL99140
PHASE
PWM
5V
VIN
12 V
2x 22µF
SW
GND
CS2
CSRTN2
THDN
0.1 µF
PWM3
BOOT
ISL99140
PHASE
PWM
5V
PVCC
VCC
EN
VIN
12 V
2x 22µF
SW
GND
CS3
CSRTN3
THDN
0.1 µF
BOOT
ISL99140
PHASE
PWM
PWM4
TWARN
5V
PVCC
VCC
EN
12 V
VIN
2x 22µF
SW
GND
CS4
SCL
COUT
VOUT1
CSRTN4
SDA
THDN
SALRT
0.1 µF
SA
PWM5
BOOT
ISL99140
PHASE
PWM
5V
PVCC
VCC
EN
VIN
12 V
2x 22µF
SW
GND
CS5
CSRTN5
CONFIG
THDN
0.1 µF
PWM6
BOOT
ISL99140
PHASE
PWM
5V
PVCC
VCC
EN
VIN
12 V
2x 22µF
SW
GND
CS6
CSRTN6
TMON1
PG1
1k
EN1
RGND1
VSEN 1
FIGURE 4. TYPICAL APPLICATION: 5+2 CONFIGURATION WITH DCR SENSING
FN8748 Rev.2.00
Jul 12, 2019
Page 8 of 48
ISL68127
Typical Application: Phase Doubler 14-Phase VR with ISL6617A+SPS
VCCS
4.7µF
RGND0
VSEN0
TMON0
EN0
PG0
3.3V
100
PVCC
ISL99227B
VCC
PWM
LGCTRL
IMON
VIN
REFIN
BOOT
TMON
PHASE
FAULT#
GND SW
VCC
CS0
CSRTN0
4.7µF
470pF
5V
ISL6617A
PWMA
CSENA
CSRTNA
0.1µF
12V
40.2k
PVCC
ISL99227B
VCC
PWM
LGCTRL
IMON
VIN
REFIN
BOOT
TMON
PHASE
FAULT#
GND SW
VINSEN
10K
0.1uF
2x22uF
12V
0.1uF
VCC
EN_SYNC
PWMB
PWMIN
CSENB
IOUT GND CSRTNB
PWM0
5V
0.01µF
5V
0.1uF
2x22uF
12V
0.1uF
CS1
CSRTN1
470pF
5V
0.1µF
PWM1
PVCC
ISL99227B
VCC
PWM
LGCTRL
IMON
VIN
REFIN
BOOT
TMON
PHASE
FAULT#
GND SW
ISL6617A
PWMA
CSENA
CSRTNA
VCC
EN_SYNC
PWMB
PWMIN
CSENB
IOUT GND CSRTNB
5V
0.1uF
2x22uF
12V
0.1uF
PVCC
ISL99227B
VCC
PWM
LGCTRL
IMON
VIN
REFIN
BOOT
TMON
PHASE
FAULT#
GND SW
ISL68127
5V
0.1uF
2x22uF
12V
0.1uF
CS2
CSRTN2
PWM2
CS3
CSRTN3
PWM3
CS4
CSRTN4
PWM4
PVCC
ISL99227B
VCC
PWM
LGCTRL
VIN
IMON
REFIN
BOOT
TMON
PHASE
FAULT#
GND SW
TWARN
CS5
CSRTN5
470pF
5V
ISL6617A
PWMA
CSENA
CSRTNA
0.1µF
0.1µF
2x22µF
12V
0.1µF
VCC
EN_SYNC
PWMB
PWMIN
CSENB
IOUT GND CSRTNB
PWM5
5V
PVCC
ISL99227B
VCC
PWM
LGCTRL
IMON
VIN
REFIN
BOOT
TMON
PHASE
FAULT#
GND SW
5V
0.1µF
2x22µF
12V
COUT
VOUT1
0.1µF
SCL
PVCC
ISL99227B
VCC
PWM
LGCTRL
IMON
VIN
REFIN
BOOT
TMON
PHASE
FAULT#
GND SW
SDA
SALRT
SA
CS6
CSRTN6
470pF
5V
0.1µF
CONFIG
PWM6
ISL6617A
PWMA
CSENA
CSRTNA
470pF
2x22µF
12V
PVCC
ISL99227B
VCC
PWM
LGCTRL
IMON
VIN
REFIN
BOOT
TMON
PHASE
FAULT#
GND SW
5V
0.1µF
2x22µF
12V
0.1µF
PG1
EN1
0.1µF
0.1µF
VCC
EN_SYNC
PWMB
PWMIN
CSENB
IOUT GND CSRTNB
TMON1
1k
5V
RGND1
VSEN1
FIGURE 5. PHASE DOUBLER 14-PHASE VR WITH ISL6617A+SMART POWER STAGE
FN8748 Rev.2.00
Jul 12, 2019
Page 9 of 48
ISL68127
Absolute Maximum Ratings
Thermal Information
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4.3V
VCCS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +1.6V
All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . .(GND - 0.3V) to VCC + 0.3V
ESD Rating:
Human Body Model (Tested per JS-001-2014) . . . . . . . . . . . . . . . . . . 2kV
Charged Device Model (Tested per JS-001-2014) . . . . . . . . . . . . . . . 1kV
Latch-Up (Tested per JESD-78D; Class 2, Level A) . . . . . . . . . . . . . . 100mA
Thermal Resistance (Notes 4, 5)
JA (°C/W) JC (°C/W)
48 Ld 6x6 QFN Package . . . . . . . . . . . . . . .
27
1
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .+150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +3.3V ±5%
Ambient Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to 3.05V
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions can adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. JA is measured in free air with the component mounted on a high-effective thermal conductivity test board with “direct attach” features. See TB379.
5. For JC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
Recommended operating conditions, VCC = 3.3V, unless otherwise specified. Boldface limits apply across the
operating temperature range -40°C to +85°C.
PARAMETER
TEST CONDITIONS
MIN
(Note 7)
TYP
MAX
(Note 7)
UNIT
VCC SUPPLY CURRENT
Nominal Supply Current
VCC = 3.3VDC; EN1/2 = VIH, fSW = 400kHz
90.5
mA
Shutdown Supply Current
VCC = 3.3VDC; EN1/2 = 0V, no switching
11.4
mA
VCCS LDO SUPPLY
Output Voltage
Maximum Current Capability
1.20
Excluding internal load
1.25
1.30
50
V
mA
POWER-ON RESET AND INPUT VOLTAGE LOCKOUT
VCC Rising POR Threshold
2.7
2.9
V
VCC Falling POR Threshold
1.0
V
Enable (EN0 and EN1) Input High Level
2.55
V
Enable (EN0 and EN1) Input Low Level
0.8
Enable (EN0 and EN1) Input LOW to HIGH Ramp Delay
(TON_DELAY)
200
POR to Initialization Complete Time
µs
30
40
ms
0.25
3.05
V
Set-point 0.8V to 3.05V
-0.5
0.5
%
Set-point 0.25V to VOUT_COMMAND (VOUT_MARGIN_HIGH
and VOUT_MARGIN_LOW, if used) > VOUT_UV_FAULT_LIMIT.
Additionally, the VOUT commands are bounded by VOUT_MAX
and VOUT_MIN to provide protection against incorrect set points
being sent to the device.
Switching Frequency
The switching frequency is user-configurable over a range of
200kHz to 1MHz.
Current Sensing
I5
The ISL68127 supports DCR, resistor, and smart power stage
current sensing. Connect to the various sense elements using the
CS and CSRTN pins. Current sensing inputs are high impedance
differential inputs to reject noise and ground related
inaccuracies.
EFFICIENCY (%)
I1
To accommodate a wide range of effective sense resistance,
PowerNavigator uses information about the effective sense
resistance and required per phase current capability to properly
configure the current sense circuitry.
INDUCTOR DCR SENSING
0
20
40
60
80
100
120
140
160
180
LOAD (A)
FIGURE 8. EFFICIENCY vs PHASE NUMBER
Phases are dropped one at a time with a user-programmed drop
delay between drop events. As an example, suppose the delay is
set to 1ms and three phases are active. If the load suddenly
drops to a level needing only one phase, the ISL68127 begins by
dropping a phase after 1ms. The ISL68127 then drops an
additional phase each 1ms until only one phase remains.
FAST PHASE ADD FUNCTION
The fast phase add function provides a very rapid response to
transient load conditions. The ISL68127 continuously monitors
the system regulation error and readies all dropped phases for
use if the system regulation error exceeds the user set threshold.
There is no delay if all phases are needed to support a load
transient. The fast phase add threshold is set in PowerNavigator.
You can also configure the output current threshold for adding
and dropping phases in PowerNavigator.
To ensure dropped phases have sufficient boot capacitor charge
to turn on the high-side MOSFET after a long period of disable, a
boot refresh circuit turns on the low-side MOSFET of each
dropped phase to refresh the boot capacitor. The boot refresh
frequency is programmable in PowerNavigator.
Output Voltage Configuration
Configure the output voltage set points and thresholds for each
output in PowerNavigator. You can configure parameters such as
output voltage, VOUT margin high/low, and VOUT OV/UV fault
thresholds.You can also adjust output voltage and margin
high/low during regulation using the PMBus commands
VOUT_COMMAND, VOUT_MARGIN_HIGH, and
VOUT_MARGIN_LOW for further tuning.
FN8748 Rev.2.00
Jul 12, 2019
DCR sensing takes advantage of the fact that an inductor
winding has a resistive component (DCR) that drops a voltage
proportional to the inductor current. Figure 9 shows that the DCR
is treated as a lumped element with one terminal inaccessible
for measurement.
L
DCR
VOUT
VPHASE
R
L
R C
DCR
IC
CSRTNn
CURRENT
SENSE
C
CSn
FIGURE 9. DCR SENSING CONFIGURATION
Fortunately, a simple R-C network as shown in Figure 10 on
page 14 can reproduce the hidden DCR voltage. By matching the
R-C time constant to the L/DCR time constant, you can precisely
recreate the DCR voltage across the capacitor. This means that
VDCR(t) = VC(t), preserving even the high frequency
characteristic of the DCR voltage.
Modern inductors often have such low DCR values that the
resulting signal is
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