DATASHEET
ISL68124
Digital Dual Output, 4-Phase Configurable, PWM Controller with PMBus
The
ISL68124
is a digital dual output, flexible multiphase
(X+Y
≤
4) 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 four phases
across the two outputs (X+Y). For example, 3+1, 2+2, 2+1, or
even a single output operation as a 4+0 configuration are
supported. The ISL68124 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 ISL68124 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 ISL68124 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.
FN8796
Rev.2.00
June 16, 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
- 4+0, 3+1, 2+2 phase operation
- Operation using less than four 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 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
GUI
- 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
-
ISL68124
product page
FN8796 Rev.2.00
June 16, 2017
Page 1 of 46
ISL68124
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: 3+1 Configuration with ISL99227 SPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical Application: 2+2 Configuration with ISL99227 SPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical Application: 2+2 Configuration with DCR Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Typical Performance Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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 (TWARN) and Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
11
11
11
11
12
12
12
12
13
14
14
15
15
15
15
15
16
16
16
16
17
17
Layout and Design Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
PMBus Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
PMBus Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
PMBus Command Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
PMBus Use Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
PMBus Data Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
PMBus Command Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
About Intersil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
FN8796 Rev.2.00
June 16, 2017
Page 2 of 46
ISL68124
Ordering Information
PART NUMBER
(Notes
1, 2, 3)
ISL68124IRAZ
NOTES:
1. Add “-T” suffix for 6k 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
ISL68124.
For more information on MSL, see
TB363.
PART
MARKING
ISL68124 IRZ
TEMP. RANGE
(°C)
-40 to +85
PACKAGE
(RoHS COMPLIANT)
40 Ld 5x5 TQFN
PKG.
DWG. #
L40.5x5D
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
ISL68124
(40 LD TQFN)
TOP VIEW
TMON1
TMON0
RGND0
31
30 CS0
29 CSRTN0
28 CS1
27 CSRTN1
26 CS2
EPAD
(GND)
25 CSRTN2
24 CS3
23 CSRTN3
22 RGND1
21 VSEN1
11
EN0
12
EN1
13
TWARN
14
PG0
15
PG1
16
SCL
17
SDA
18
SALRT
19
CONFIG
20
VINSEN
VSEN0
32
VCCS
36
DNC
DNC
DNC
VCC
35
40
PWM0
PWM1
PWM2
PWM3
GND
DNC
GND
DNC
DNC
DNC
1
2
3
4
5
6
7
8
9
10
39
38
37
SA
34
33
FN8796 Rev.2.00
June 16, 2017
Page 3 of 46
ISL68124
Functional Pin Descriptions
Refer to
Table 4 on page 18
for design layout considerations.
PIN NUMBER
4, 3, 2, 1
5, 7
6, 8, 9, 10,
38, 39, 40
11
12
13
14
15
16
17
18
19
20
21
22
PIN NAME
DESCRIPTION
PWM[3:0] 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.
GND
DNC
EN0
EN1
TWARN
PG0
PG1
SCL
SDA
SALRT
CONFIG
VINSEN
VSEN1
RGND1
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 outputs. Maximum pull-up voltage is V
CC
.
Open-drain, power-good indicator for Output 0. Maximum pull-up voltage is V
CC
.
Open-drain, power-good indicator 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 on page 15
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.
23, 25, 27, 29 CSRTN[3:0] 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 ISL68124 supports smart power stage, DCR, and resistor sensing.
24, 26, 28, 30 CS[3:0]
Connection details depend on the current sense method chosen.
31
32
33
34
35
36
37
EPAD
RGND0
VSEN0
TMON0
TMON1
VCC
VCCS
SA
GND
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.
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 14
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 14
for more information.
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).
PMBus addresses selection pin. See
Table 2
for more details.
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
QUIESCENT CURRENT
(mA)
4.85
0.19
0.19
GATE
DRIVE VOLTAGE
(V)
5
5
5
NUMBER OF
DRIVERS
Single
Single
Single
COMMENTS
60A, 5x5 smart power stage
40A, 6x6 DrMOS
Connect ISL6596 VCTRL to 3.3V
FN8796 Rev.2.00
June 16, 2017
Page 4 of 46
ISL68124
Internal Block Diagram
PG0
CS0
CSRTN0
CS1
CSRTN1
ADC
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
STATUS
MANAGER
PG1
TWARN
ADC
CS2
CSRTN2
ADC
CYCLE-
CYCLE OCP
CYCLE-
CYCLE OCP
LOOP
MANAGER
EN0
EN1
CS3
CSRTN3
ADC
CPU
ISUM-0
ISUM-1
VDROOP
CURREN
T AC FB
SUMMED
OCP
CONFIG
SA
NVM
SUMMED
OCP
BLACKBOX
VSE N0
RGND0
VSA
ADC
PID
PHASE MANAGER
DIGITAL
DUAL EDGE
MODULATOR
OV
CURREN
T AC FB
-
+
-
+
PWM0
PWM1
PWM2
PWM3
VDROOP
UV
VSE N1
RGND1
VSA
ADC
PID
OV
-
+
-
+
DIGITAL
DUAL EDGE
MODULATOR
VINSEN
TMO N0
TMO N1
VCC
LDO
VCCS
ADC
UV
SCL
FAULT AND
TELEMETRY
MANAGER
PMBus
INTERFACE
SDA
SALRT
FIGURE 1. INTERNAL BLOCK DIAGRAM
FN8796 Rev.2.00
June 16, 2017
Page 5 of 46
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