DATASHEET
ISL68147
Digital Dual Output, 7-Phase Configurable, PWM Controller with PMBus for
Cavium
The
ISL68147
is a digital dual output, flexible multiphase
(X+Y
≤
7) PWM controller developed to support the latest
Cavium CN99xx server class processors. The ISL68147
supports the PMbus1.3 specification and meets the latest Intel
server-class transient performance 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. With full
digital control, this new generation of controllers ushers in
design flexibility by supporting any microprocessor, FPGA, or
Digital ASIC rail requirements that includes adjustable load
setting. The ISL68147 uses the Intersil 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 the Intersil PowerNavigator™ GUI. The
ISL68147 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
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
PowerNavigator.
The ISL68147 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.
FN8880
Rev.2.00
Jul 14, 2017
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 - V
IN
, V
OUT
, I
OUT
, power IN/OUT, temperature,
and various fault status registers
- Up to 2MHz bus interface
• Flexible phase configuration
- 7+0, 6+1, 5+2, 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 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 using
PowerNavigator
- NVM to store up to 8 configurations
• Pb-free (RoHS compliant)
Applications
• Networking equipment
• Telecom/datacom equipment
• Server/storage equipment
• Point-of-load power supply (Memory, DSP, ASIC, FPGA)
Related Literature
• For a full list of related documents, visit our website
-
ISL68147
product page
FN8880 Rev.2.00
Jul 14, 2017
Page 1 of 47
ISL68147
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fault Monitoring and Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-Good Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Voltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Current Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Smart Power Stage OC Fault Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Monitoring and Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
12
12
12
12
13
13
13
13
14
15
15
16
16
16
16
16
16
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
About Intersil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
FN8880 Rev.2.00
Jul 14, 2017
Page 2 of 47
ISL68147
Ordering Information
PART NUMBER
(Notes
1, 2, 3)
ISL68147IRAZ
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 the product information page for
ISL68147.
For more information on MSL, see
TB363.
PART
MARKING
ISL68147 IRZ
TEMP. RANGE
(°C)
-40 to +85
PACKAGE
(RoHS COMPLIANT)
48 Ld 6x6 QFN
PKG.
DWG. #
L48.6x6B
TABLE 1. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
PART NUMBER
ISL68147
ISL68144
ISL68137
ISL68134
ISL68127
ISL68124
PHASE CONFIGURATION
OUTPUT X/OUTPUT Y
X+Y
≤
7
X+Y
≤
4
X+Y
≤
7
X+Y
≤
4
X+Y
≤
7
X+Y
≤
4
SPECIFICATION SUPPORTED
Cavium Thunder X2, PMBus
PMBus
PMBus/AVSBus
PMBus/AVSBus
PMBus
PMBus
PACKAGE
QFN 48 Ld, 6x6mm
TQFN 40 Ld, 5x5mm
QFN 48 Ld, 6x6mm
TQFN 40 Ld, 5x5mm
QFN 48 Ld, 6x6mm
TQFN 40 Ld, 5x5mm
Pin Configuration
ISL68147
(48 LD QFN)
TOP VIEW
CSRTN0
37
36
35
CS1
CSRTN1
34 CS2
33
32
EPAD
(GND)
CSRTN2
CS3
31 CSRTN3
30 CS4
29 CSRTN4
28 CS5
27 CSRTN5
26 CS6
25 CSRTN6
13
EN0
14
EN1
15
TWARN
16
PG0
17
PG1
18
SCL
19
SDA
20
SALRT
21
CONFIG
22
VINSEN
23
VSEN1
24
RGND1
TMON1
TMON0
RGND0
39
VSEN0
VCCS
DNC
DNC
DNC
VCC
48
PWM0
PWM1
PWM2
PWM3
PWM4
PWM5
PWM6
GND
DNC
1
2
3
4
5
6
7
8
9
47
46
45
44
43
42
41
40
38
GND 10
DNC 11
DNC 12
FN8880 Rev.2.00
Jul 14, 2017
CS0
SA
Page 3 of 47
ISL68147
Functional Pin Descriptions
PIN NUMBER
7, 6, 5, 4, 3, 2, 1
8, 10
9, 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]
GND
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
Refer to
Table 4 on page 19
for design layout considerations.
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.
Ground pins. Connect directly to system GND plane.
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 on page 16
for more details.
Input voltage sense pin. Connect to VIN through a resistor divider (typically 402k/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 ISL68147 supports smart power stage, DCR,
and resistor sensing. Connection details depend on the 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 12
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
“Temperature Compensation” on page 15
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
“Temperature Compensation” on page 15
for more information.
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 Recommendations
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
60A, 5x5 smart power stage
40A, 6x6 DrMOS
Connect ISL6596 VCTRL to 3.3V
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.
COMMENTS
FN8880 Rev.2.00
Jul 14, 2017
Page 4 of 47
ISL68147
Internal Block Diagram
CS0
CSRTN0
CS1
CSRTN1
CS2
CSRTN2
CS3
CSRTN3
CS4
CSRTN4
CS5
CSRTN6
CS6
CSRTN6
ADC
ADC
ADC
ADC
PG0
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
STATUS
MANAGER
PG1
TWARN
ADC
LOOP
MANAGER
EN0
EN1
ADC
CPU
CONFIG
SA
ADC
ISUM-0
ISUM-1
VDROOP
CURRENT
AC FB
SUMMED
OCP
NVM
BLACKBOX
SUMMED
OCP
VSEN0
RGND0
VSA
ADC
PID
OV
‐
PHASE MANAGER
DIGITAL
DUAL EDGE
MODULATOR
+
PWM0
PWM1
PWM2
PWM3
PWM4
PWM5
PWM6
VDROOP
CURRENT
AC FB
UV
-
+
VSEN1
RGND1
VSA
ADC
PID
OV
-
+
-
+
DIGITAL
DUAL EDGE
MODULATOR
VINSEN
TMON0
TMON1
VCC
LDO
VR12
ADC
UV
PMBUS
INTERFACE
SCL
SDA
SALRT
FAULT AND
TELEMETRY
MANAGER
FIGURE 1. INTERNAL BLOCK DIAGRAM
FN8880 Rev.2.00
Jul 14, 2017
Page 5 of 47
