DATASHEET
ISL68137
Digital Dual Output, 7-Phase Configurable PWM Controller with Adaptive Voltage
Scaling Bus (AVSBus)
The
ISL68137
is a digital dual output, flexible multiphase
(X+Y
≤
7) PWM controller with Adaptive Voltage Scaling Bus
(AVSBus) interface. The ISL68137 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 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 after the device is configured using PMBus.
The ISL68137 uses 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
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 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, 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.
FN8757
Rev.1.00
Jun 26, 2017
Features
• PMBus 1.3 and AVSBus compliant
- Telemetry - V
IN
, V
OUT
, I
OUT
, 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 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 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 the
PowerNavigator
GUI
- NVM to store up to eight configurations
• Pb-free (RoHS compliant)
Applications
• Networking equipment
• Telecom and datacom equipment
• Server and storage equipment
• Point-of-load power supply (Memory, DSP, ASIC, FPGA)
Related Literature
• For a full list of related documents, visit our website
-
ISL68137
product page
FN8757 Rev.1.00
Jun 26, 2017
Page 1 of 54
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
13
13
13
13
13
14
14
14
15
16
16
17
17
17
17
17
17
18
18
18
20
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
OT_FAULT_LIMIT (4Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Adaptive Voltage Scaling (AVSBus) Functionality and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
AVSBus Master Send Subframe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
AVSBus Slave Response Subframe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
AVSBus Command Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
About Intersil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
FN8757 Rev.1.00
Jun 26, 2017
Page 2 of 54
ISL68137
Ordering Information
PART NUMBER
(Notes
1, 2, 3)
ISL68137IRAZ
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
ISL68137.
For more information on MSL, see
TB363.
PART
MARKING
ISL68137 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
ISL68137
ISL68134
ISL68127
ISL68124
PHASE CONFIGURATION
OUTPUT X/OUTPUT Y
X+Y
≤
7
X+Y
≤
4
X+Y
≤
7
X+Y
≤
4
SPECIFICATION SUPPORTED
PMBus/AVSBus
PMBus/AVSBus
PMBus
PMBus
PACKAGE
QFN 48 Ld, 6x6mm
TQFN 40 Ld, 5x5mm
QFN 48 Ld, 6x6mm
TQFN 40 Ld, 5x5mm
Pin Configuration
ISL68137
(48 LD QFN)
TOP VIEW
CSRTN0
37
36
35
CS1
CSRTN1
34 CS2
33
32
GND
(EPAD)
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
CS0
38
SA
41
48
PWM0
PWM1
PWM2
PWM3
PWM4
PWM5
PWM6
AVS_CLK
AVS_SDA
1
2
3
4
5
6
7
8
9
47
46
45
44
43
42
40
AVS_MDA 10
AVS_VDDIO 11
DNC 12
FN8757 Rev.1.00
Jun 26, 2017
Page 3 of 54
ISL68137
Functional Pin Descriptions
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
Refer to
Table 4 on page 21
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.
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 V
CC
.
Open-drain, power-good indicators for Output 0. Maximum pull-up voltage is V
CC
.
Open-drain, power-good indicators for Output 1. Maximum pull-up voltage is V
CC
.
Serial clock signal pin for SMBus interface. Maximum pull-up voltage is V
CC
.
Serial data signal pin for SMBus interface. Maximum pull-up voltage is V
CC
.
Serial alert signal pin for SMBus interface. Maximum pull-up voltage is V
CC
.
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.
FN8757 Rev.1.00
Jun 26, 2017
Page 4 of 54
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
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.
COMMENTS
Internal Block Diagram
CS0
CYCLE-
CYCLE OCP
PG0
CSRTN0
CS1
CSRTN1
CS2
ADC
STATUS
MANAGER
PG1
TWARN
ADC
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
LOOP
MANAGER
CSRTN2
CS3
ADC
CSRTN3
CS4
CSRTN4
ADC
EN0
EN1
ADC
CS5
CSRTN6
CS6
CSRTN6
ADC
CPU
CONFIG
SA
ADC
ISUM-0
ISUM-1
SUMMED
OCP
NVM
BLACKBO X
VDROOP
CURRENT
AC FB
SUMMED
OCP
VSE N0
RGND0
VSA
ADC
PID
DIG ITAL DUAL
EDGE
MODULATOR
OV
CURRENT
AC FB
PWM0
PWM1
PHASE MANAGER
PWM2
PWM3
PWM4
PWM5
PWM6
-
+
-
+
VDROOP
UV
VSE N1
RGND1
VSA
ADC
PID
OV
-
+
-
+
DIG ITAL DUAL
EDGE
MODULATOR
VINSEN
TMO N0
TMO N1
ADC
LDO
VCCS
UV
PMBus
INTERFACE
SCL
SDA
SALRT
AVS_CLK
VCC
FAULT AND
TELEMETRY
MANAGER
AVSBus
INTERFACE
AVS_MDA
AVS_SDA
AVS_VDDIO
FIGURE 1. INTERNAL BLOCK DIAGRAM
FN8757 Rev.1.00
Jun 26, 2017
Page 5 of 54
