DATASHEET
ISL68300
Scalable Single Output Digital PWM Controller with Integrated Driver and
PMBus
The ISL68300 is a PMBus compliant, single-phase
digital DC/DC controller optimized for use with discrete
MOSFETs.
The ISL68300 implements the Renesas fully digital
ChargeMode™ control modulation scheme, allowing it
to achieve both industry leading performance and ease of
use. ChargeMode control provides an inherently stable
control loop that can respond to load transients in a single
switching cycle, significantly decreasing output capacitor
requirements.
A dedicated current share bus allows for paralleling up to
eight devices in a current share configuration, allowing
support for a wide range of load currents.
In conjunction with many other Renesas digital
controllers, the ISL68300 is capable of complex
sequencing and fault spreading. The Digital-DC™
(DDC) bus is a single-wire serial bus which provides
high performance inter-device communication without
the need for external sequencers, reducing overall system
costs.
The PMBus interface facilitates device configuration,
provides supply telemetry and detailed fault reporting
including a parametric capture tool (SnapShot). All of
these features are conveniently accessible through the
PowerNavigator™ software tool. Additionally, a wide
array of common configuration options are
independently configurable through use of pin-strap
resistors.
The ISL68300 supports a comprehensive fault
management system, with dedicated hardware support
for cycle-by-cycle overcurrent, overvoltage,
undervoltage, and temperature faults. The configurable
fault response system is capable of latching off or
restarting the output on a fault-by-fault basis. Integrated
LDOs for device and gate driver bias allow for single
supply operation.
A companion device, the ISL68301, has a PWM output,
which can be paired with the Renesas family of Smart
Power power stages or DrMOS devices.
FN8789
Rev.0.00
Jun 7, 2018
Features
• Unique compensation-free design, which is always
stable
• Output voltage range: 0.45V to 5.5V
• Input voltage range: 4.75V to 16V or 4.5V to 5.5V
• 0.5% output voltage accuracy over line, load, and
temperature
• ChargeMode control achieves fast transient response,
reduced output capacitance, and provides output
stability without compensation
• Single-channel output, can be paralleled with up to
eight devices in a single droop-less current sharing
output
• Switching frequency range of 200kHz to 1.0MHz
• Proprietary single-wire DDC serial bus enables
voltage sequencing and fault spreading with other
Renesas digital power ICs
• Cycle-by-cycle inductor peak current protection
• Digital fault protection for output voltage UV/OV,
input voltage UV/OV, and temperature
• Cycle-by-cycle output current measurement with
adjustable gain settings for sensing with high current,
low DCR inductors
• Monitor ADC measures input voltage, input current,
output voltage, internal temperature, and external
temperature
• Nonvolatile memory (NVRAM) for storing operating
parameters and fault events
• PMBus compliant, supports 112 PMBus commands
Applications
• Servers and storage equipment
• Telecom and datacom equipment
• Power supplies (FPGA, ASIC, DSP, memory)
Related Literature
For a full list of related documents, visit our website
• ISL68300 product page
FN8789 Rev.0.00
Jun 7, 2018
Page 1 of 116
ISL68300
Simplified Application
VIN
4.75V - 16V
VDD
V5
VG
ISL68300
V1P5
GH
BOOT
VOUT
0.5V – 5.5V
SW
VSET/SA
GL
SYNC
ISENP
ISENN
Control and
Status
Inter-Device
Communication
PMBus
EN
PG
VSENP
VSENN
DDC
ISHARE
TEMP/
TRK
SDA
SCL
SALRT
SGND
PGND
Figure 1. Wide Range Input and Output Applications
FN8789 Rev.0.00
Jun 7, 2018
Page 2 of 116
ISL68300
Contents
1.
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1
1.2
1.3
1.4
1.5
2.
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
6
8
9
9
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1
2.2
2.3
2.4
3.
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
11
12
12
ISL68300 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1
3.2
3.3
3.4
3.5
3.6
3.7
4.
Pin-Strap Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start-Up and Shutdown Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Internal Bias Regulators and Input Supply Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start-Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ton-Delay and Rise Times. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enable Pin Operation and Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-Good. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15
17
17
18
19
19
20
Power Management Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
4.13
4.14
4.15
4.16
4.17
4.18
Input Voltage Undervoltage and Overvoltage Protections . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Overvoltage and Undervoltage Protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Prebias Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inductor Current Sensing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diode Emulation Mode (DEM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Overcurrent and Undercurrent Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Overload Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Temperature Monitoring and Voltage Tracking (XTEMP/TRK) . . . . . . . . . . . . . . . . .
Control Loop Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SMBus Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital-DC Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Phase Spreading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fault Spreading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Active Current Sharing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nonvolatile Memory and Security Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Monitoring Through SMBus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General PowerPAD Design Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FN8789 Rev.0.00
Jun 7, 2018
21
21
22
23
23
23
24
24
27
27
28
28
28
29
29
29
30
30
Page 3 of 116
ISL68300
5.
PMBus Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.
PMBus Command Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.1
6.2
PMBus Use Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
PMBus Data Formats. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
7.
PMBus Command Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8.
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
9.
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
FN8789 Rev.0.00
Jun 7, 2018
Page 4 of 116
ISL68300
1.
1. Overview
Overview
1.1
Block Diagram
SC PGA
VSENP/N
ASCR
Digital PWM
Modulator
ADC
GH
PWM and
MOSFET
Driver
ZCD
Peak Detector
Com parators
SW
GL
Target Voltage
Generato r
TMON
TEMP/TRK
BOOT
MUX
Monitor
ADC
VDD
ISHARE
Cir cui t
DDC
CLK
GEN
Curr ent
Synthesizer
ADC
PGA
ISENP
OSC
SYNC
ISHARE
ISENN
PLL
Microcontroller s
and Non-Volatile
Memory
ZCD
Peak Detector
Com parators
Digital-DC
Inter-Device
Com municati ons
EN
PG
SDA
SCL
I2 C and SMBus
Serial Interface
SALRT
VD
D
VG
V5
LDOs
V1P5
VSET/SA
Pin-Str ap
Detecto r/GPIO
Figure 2. Block Diagram
FN8789 Rev.0.00
Jun 7, 2018
Page 5 of 116
ISL68300
1.2
1. Overview
Typical Applications
VIN
4.75V - 16V
VDD
V5
VG
ISL68300
GH
BOOT
V1P5
VOUT
0.5V – 5.5V
SW
VSET/SA
GL
SYNC
ISENP
ISENN
Control and
Status
Inter-Device
Communication
PMBus
EN
VSENP
VSENN
PG
DDC
ISHARE
TEMP/
TRK
SDA
SCL
SALRT
SGND
PGND
Figure 3. Wide Range Input and Output Applications
VIN
4.5V - 5.5V
VDD
V5
VG
ISL68300
V1P5
GH
BOOT
VOUT
0.5V – 5.5V
SW
VSET/SA
GL
SYNC
ISENP
ISENN
Control and
Status
Inter-Device
Communication
PMBus
EN
PG
VSENP
VSENN
DDC
TEMP/
ISHARE
TRK
SDA
SCL
SALRT
SGND
PGND
Figure 4. 5V Nominal Input Voltage Applications
FN8789 Rev.0.00
Jun 7, 2018
Page 6 of 116
ISL68300
1. Overview
VIN
4.75V - 16V
VDD
V5
VG
ISL68300
GH
BOOT
V1P5
SW
VSET/SA
GL
SYNC
ISENP
ISENN
EN
VSENP
PG
VSENN
DDC
ISHARE
TEMP/
TRK
SDA
SCL
SALRT
VOUT
0.5V - 5.5V
SGND
PGND
VIN
Control
and Status
VDD
V5
VG
ISL68300
V1P5
GH
BOOT
SW
VSET/SA
GL
SYNC
ISENP
ISENN
PMBus
EN
VSENP
PG
VSENN
DDC
ISHARE
TEMP/
TRK
SDA
SCL
SALRT
SGND
PGND
Figure 5. 2-Phase Current Sharing Rail
FN8789 Rev.0.00
Jun 7, 2018
Page 7 of 116
ISL68300
1.3
1. Overview
Ordering Information
Part Number
(Notes 2, 3)
Part Marking
Temp. Range (°C)
Tape and Reel
(Units) (Note 1)
Package
(RoHS Compliant)
ISL68300IRAZ
683 00IRAZ
-40 to +85
-
24 Ld 4x4 QFN
L24.4x4H
ISL68300IRAZ-T
683 00IRAZ
-40 to +85
4k
24 Ld 4x4 QFN
L24.4x4H
ISL68300IRAZ-T7A
683 00IRAZ
-40 to +85
250
24 Ld 4x4 QFN
L24.4x4H
ISL68300IRAZ-TK
683 00IRAZ
-40 to +85
1k
24 Ld 4x4 QFN
L24.4x4H
Pkg. Dwg. #
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 product information page for the ISL68300. For more information about MSL, refer
to TB363.
ISL68300
I R A Z T
Product Designator
Shipping Option
T = Tape and Reel - 4000 pcs
Contact factory for other options
Lead Finish
Z = Lead-free
Firmware Revision
Alpha character
Package Designator
R = QFN package
Operating Temperature Range
I = -40°C to +85°C
Table 1. Key Differences Between Family of Parts
Part Number
Internal MOSFET Driver
SPS Support
ISL68300
Yes
No
Discrete or Dual Device MOSFETs
ISL68301
No
Yes
ISL99227B
FN8789 Rev.0.00
Jun 7, 2018
Recommended Power Stages
Page 8 of 116
ISL68300
1.4
1. Overview
Pin Configuration
19 VDD
20 EN
21 ISHARE
22 DDC
24 SDA
23 SALERT
24 Ld 4x4 QFN
Top View
SCL 1
18 BOOT
SYNC 2
PG 3
17 GH
Exposed Paddle
Connect to SGND
V5 12
SGND 11
13 PGND
V1P5 10
VSENP 6
VSET/SA 9
14 GL
ISENP 8
15 VG
VSENN 5
ISENN 7
1.5
16 SW
TEMP/TRK 4
Pin Descriptions
Pin
Label
Type
(Note 4)
1
SCL
I/O
2
SYNC
M/I/O
3
PG
O
Power-good output. Can be configured as open-drain or push-pull using the PMBus interface.
Default setting is open-drain.
4
TEMP/TRK
I
External temperature sensor input. Connect to and external 2N3904 base-emitter junction with
collector shorted to base. Can also be configured as a tracking voltage input. If not used, connect
to SGND.
5
VSENN
I
Differential voltage sense feedback. Connect to a negative output regulation point.
6
VSENP
I
Differential voltage sense feedback. Connect to a positive output regulation point.
7
ISENN
I
Negative differential voltage input for current sensing should be routed as a pair with ISENP. See
“Inductor Current Sensing” on page 23 for details.
8
ISENP
I
Positive differential voltage input for current sensing should be routed as a pair with ISENN. See
“Inductor Current Sensing” on page 23 for details.
9
VSET/SA
M
Used to assign a unique address for each device and to set output voltage set-point. See Table 3
on page 16 for PMBus address and output voltage options. Connect one resistor to SGND and a
second resistor to V1P5. Default VOUT maximum is 115% of VOUT setting, but this can be
overridden through the PMBus interface with VOUT_MAX command.
10
V1P5
PWR
Bypass for internal 1.5V reference used to power internal circuitry. Decouple with a high quality
4.7µF X5R 6V or better ceramic capacitor placed close to this pin.
11
SGND
PWR
Connect to low impedance ground plane. Internal connection to SGND. All pin-strap resistors
should be connected to SGND. SGND must be connected to PGND so that there is a minimum
voltage differential between SGND and PGND. Use of a contiguous ground plane is
recommended.
12
V5
PWR
Bypass for internal 5V reference used to power internal circuitry. Decouple with a high quality
4.7µF X5R 6V or better ceramic capacitor placed close to this pin.
FN8789 Rev.0.00
Jun 7, 2018
Description
Serial clock. Connect to external host and/or to other Renesas devices. Requires a pull-up
resistor to a 3.3V or 5.5V source. V5 source recommended.
Clock synchronization input. Used to set the frequency of the internal clock, to sync to an
external clock or an output internal clock. When used as part of a SYNC bus in order to achieve
phase spreading or as part of a current sharing rail, one of the devices must have this pin
configured as an output, with no pull-up or pull-down resistors on the bus.
Page 9 of 116
ISL68300
1. Overview
Pin
Label
Type
(Note 4)
13
PGND
PWR
Description
Power Ground. Must connect to SGND using a contiguous ground plane. VDD and VG bypass
capacitors must connect to this pin by the shortest possible path.
14
GL
O
15
VG
PWR
5V nominal supply for gate drive circuitry. Decouple with a high quality 4.7µF X5R 6V or better
ceramic capacitor placed close to this pin. Additional decoupling capacitance may be needed
depending on the gate drive current needed to drive the external power MOSFETs. Limited to
40mA maximum.
Low-side gate drive.
16
SW
PWR
Switch node of the power stage; node containing high-side FET drain, low-side FET source, and
inductor.
17
GH
O
18
BOOT
PWR
High-side gate drive bias supply. Connect a 0.1µF X7R 10V or better ceramic capacitor from this
pin to the PHASE pin.
19
VDD
PWR
Supply voltage. Decouple with a high quality 1µF X7R 16V or better ceramic capacitor placed
close to this pin.
20
EN
I
Enable input. Active signal enables device. Recommended to be tied low during device
configuration. The EN signal must be “de-bounced” to achieved specified delay timing. Positive
or negative pulse widths shorter than 10µs are ignored.
21
ISHARE
I/O
Current sharing communication bus. Connect to other ISHARE enabled ISL devices to achieve
droop-less current sharing.
22
DDC
I/O
Single-wire DDC bus (current sharing, and inter-device communication). Requires a pull-up
resistor to a 3.3V or 5.5V source. V5 source recommended. Pull-up voltage must be present
when the device is powered.
23
SALRT
O
Serial alert. Connect to external host if desired. Requires a pull-up resistor to a 3.3V or 5.5V
source. V5 source recommended. If not used, this pin should be left floating.
24
SDA
I/O
Serial data. Connect to external host and/or to other Renesas devices. Requires a pull-up
resistor to a 3.3V or 5.5V source. V5 source recommended.
PAD
-
PWR
High-side gate drive.
Exposed thermal pad. Connect to low impedance ground plane. Internal connection to SGND.
Note:
4. I = Input, O = Output, PWR = Power or Ground, M = Multi-mode pins.
FN8789 Rev.0.00
Jun 7, 2018
Page 10 of 116
ISL68300
2.
2. Specifications
Specifications
2.1
Absolute Maximum Ratings
Parameter
Minimum
Maximum
Unit
DC Supply Voltage: VDD
-0.3
18
V
Logic I/O Voltage: SCL, SDA, SALRT, SYNC, PG, VSET/SA, EN, DDC
-0.3
6.0
V
Analog Input Voltages: TEMP/TRK, VSENP, VSENN, ISENP, ISENN
-0.3
6.0
V
Logic Reference: V1R5. ISHARE
-0.3
3
V
Bias Supplies: V5, VG
-0.3
6.0
V
Ground Voltage Differential (PGND-SGND)
-0.3
+0.3
V
Gate Drive GH - SW
-0.3
6.0
V
Gate Drive GH
-0.3
30.0
V
Gate Drive BOOT
-0.3
30.0
V
Gate Drive BOOT - SW
-0.3
8.0
V
ESD Ratings
Value
Unit
2
kV
Charged Device Model (Tested per JS-002-2014)
750
V
Latch-Up (Tested per JESD78E; Class 2, Level A)
100
mA
Human Body Model (Tested per JS-001-2017)
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may
adversely impact product reliability and result in failures not covered by warranty.
For Drive Voltage (VG), output current is limited by device thermal dissipation.
2.2
Thermal Information
Thermal Resistance (Typical)
24 Ld QFN Package (Notes 5, 6)
JA (°C/W)
JC (°C/W)
37
2
Notes:
5. JA is measured in free air with the component mounted on a high-effective thermal conductivity test board with “direct attach”
features. See TB379.
6. For JC, the “case temp” location is the center of the exposed metal pad on the package underside.
Parameter
Minimum
Maximum
Unit
Junction Temperature
-55
+150
°C
Storage Temperature Range
-55
+150
°C
Pb-Free Reflow Profile
FN8789 Rev.0.00
Jun 7, 2018
see TB493
Page 11 of 116
ISL68300
2.3
2. Specifications
Recommended Operating Conditions
Minimum
Maximum
Unit
Input Supply Voltage Range, VDD
Parameter
4.75
16
V
Input Supply Voltage Range, VDD,V5 and VG tied together
4.5
5.5
V
Output Voltage Range, VOUT
0.45
5.5
V
Operating Junction Temperature Range, TJ
-40
+125
°C
Ambient Temperature Range, TA
-40
+85
°C
5V (V5) Supply Total Supplied Current (Note 7)
5
mA
Drive Voltage (VG) Supply Total Supplied Current (Note 8)
40
mA
Notes:
7. JA Total of current used by pull-ups to SDA, SCL, SALRT, DDC, EN, and PG (including Push-Pull configuration).
8. For Drive Voltage (VG), output current is limited by device thermal dissipation.
2.4
Electrical Specifications
VDD = 12V. Typical values are at TA = +25°C. Boldface limits apply across the operating ambient temperature range,
TA = -40°C to +85°C.
Parameter
Test Conditions
Min
(Note 12)
Typ
Max
(Note 12)
Unit
IC Input and Bias Supply Characteristics
IDD Supply Current
fSW = 200kHz
-
20
30
mA
fSW = 1.00MHz
-
30
37
mA
IDD Device Disabled Current
EN = 0V, SMBus inactive, VDD = 12V,
fSW = 1.00MHz
-
20
28
mA
V5 Reference Output Voltage
VDD > 6V, I < 5mA
4.75
5.0
5.25
V
V1P5 Reference Output Voltage
For reference only, V5 > 3V
1.45
1.5
1.55
V
VG Output Voltage
For reference only, VDD = 12V
4.75
5.0
5.25
V
Output Voltage Adjustment Range
VIN > VOUT + 1.1V
0.45
-
5.5
V
Output Voltage Set-Point Accuracy
(Note 10)
Across line, load and temperature variation
1.0 ≤ VOUT < 5.250; -40°C< TA< 85°C
-0.5
±0.3
0.5
% VOUT
Across line, load and temperature variation
0.500 ≤ VOUT < 1.0; 0°C< TA 0µH to 100µH
Command
INDUCTOR (D6h)
Format
Linear-11
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
1
1
0
Function
Signed Exponent, N
Default Value
1
0
1
Signed Mantissa, Y
0
1
0
1
0
0
1
1
0
SNAPSHOT_FAULT_MASK (D7h)
Definition: Prevents faults from causing a SNAPSHOT event (and store) from occurring.
Data Length in Bytes: 2
Data Format: BIT
Type: R/W
Protectable: Yes
Default Value: 0000h (no faults masked)
Units: N/A
Range: N/A
Command
SNAPSHOT_FAULT_MASK (D7h)
Format
Bit Field
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
0
0
0
0
0
0
Function
See Following Table
Default Value
0
0
0
0
0
0
0
0
0
0
Bit Number
Status Bit Name
15
Fault Phase
Ignore phase faults in a current sharing rail
14
Fault Group
Ignore rail faults in a fault spreading group
13
Fault CPU
12
Fault UT
Ignore under-temperature faults
11
Fault OT
Ignore over-temperature faults
FN8789 Rev.0.00
Jun 7, 2018
Meaning
Ignore CPU faults
Page 90 of 116
ISL68300
7. PMBus Command Detail
Bit Number
Status Bit Name
Meaning
10
Fault peak OC
Ignore peak output overcurrent faults
9
Fault peak UC
Ignore peak output undercurrent faults
8
Fault EN pin as fault bus
Ignore Enable pin faults when the Enable pin is used as a fault
bus
7
Fault VIN_OV
6
Fault VOUT_OV
Ignore output overvoltage faults
Ignore input overvoltage faults
5
Fault VOUT_UV
Ignore output undervoltage faults
4
Not Used
Not Used
3
Fault Sync
Ignore loss of synchronization faults
2
Fault VIN_UV
1
Fault IOUT_OC
Ignore output average overcurrent faults
0
Fault IOUT_UC
Ignore output average undercurrent faults
Ignore Input undervoltage faults
OVUV_CONFIG (D8h)
Definition: Configures the output voltage OV and UV fault detection parameters.
Data Length in Bytes: 1
Data Format: Bit Field
Type: R/W
Protectable: Yes
Default Value: 00h
Units: N/A
Command
OVUV_CONFIG (D8h)
Format
Bit Field
Bit Position
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
1
0
Function
Default Value
Bits
See Following Table
0
0
Purpose
0
0
Value
0
Description
7:4
Not Used
0
Not used
3:0
Defines the number of consecutive limit violations
required to declare an OV or UV fault
N
N+1 consecutive OV or UV violations initiate a fault
response
FN8789 Rev.0.00
Jun 7, 2018
Page 91 of 116
ISL68300
7. PMBus Command Detail
XTEMP_SCALE (D9h)
Definition: Sets a scalar value that is used for calibrating the external temperature. The constant is applied in the
equation below to produce the read value of TEMP through the PMBus command READ_TEMPERATURE_2. Values
outside of the range are not accepted.
Data Length in Bytes: 2
Data Format: Linear-11
Type: R/W
Protectable: Yes
Default Value: BA00h (1.0)
Units: 1/°C
Equation:
1
READ_TEMPERATURE_2 = ExternalTemperature •
XTEMP_SCALE
- XTEMP_OFFSET
Range: 0.1°C to 10°C
Command
XTEMP_SCALE (D9h)
Format
Linear-11
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
Function
Default Value
Signed Exponent, N
1
0
1
1
Signed Mantissa, Y
1
0
1
0
0
0
0
0
XTEMP_OFFSET (DAh)
Definition: Sets an offset value that is used for calibrating the external temperature. The constant is applied in the
equation below to produce the read value of TEMP through the PMBus command READ_TEMPERATURE_2. Values
outside of the range are not accepted.
Data Length in Bytes: 2
Data Format: Linear-11
Type: R/W
Protectable: Yes
Default Value: 0000h (0 °C)
Units: °C
Equation:
READ_TEMPERATURE_2 = ExternalTemperature •
Range: -100°C to +100°C
1
XTEMP_SCALE
Command
XTEMP_OFFSET (DAh)
Format
Linear-11
- XTEMP_OFFSET
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
Function
Default Value
Signed Exponent, N
0
FN8789 Rev.0.00
Jun 7, 2018
0
0
0
Signed Mantissa, Y
0
0
0
0
0
0
0
0
Page 92 of 116
ISL68300
7. PMBus Command Detail
MFR_SMBALERT_MASK (DBh)
Definition: Used to prevent faults from activating the SALRT pin. The bits in each byte correspond to a specific fault
type as defined in the STATUS command.
Data Length in Bytes: 7
Data Format: Bit Field
Type: R/W
Protectable: Yes
Default Value: 00 00 00 00 00 00 00h (No faults masked)
Units: N/A
Command
MFR_SMBALT_MASK (DBh)
Format
Bit Field
Access
R/W
R/W
R/W
Function
R/W
R/W
R/W
R/W
R/W
See following table
Bit Position
55
54
53
52
51
50
49
48
Default Value Byte 6
0
0
0
0
0
0
0
0
Bit Position
47
46
45
44
43
42
41
40
Default Value Byte 5
0
0
0
0
0
0
0
0
Bit Position
39
38
37
36
35
34
33
32
Default Value Byte 4
0
0
0
0
0
0
0
0
Bit Position
31
30
29
28
27
26
25
24
Default Value Byte 3
0
0
0
0
0
0
0
0
Bit Position
23
22
21
20
19
18
17
16
Default Value Byte 2
0
0
0
0
0
0
0
0
Bit Position
15
14
13
12
11
10
9
8
Default Value Byte 1
0
0
0
0
0
0
0
0
Bit Position
7
6
5
4
3
2
1
0
Default Value Byte 0
0
0
0
0
0
0
0
0
Byte
Status Byte Name
6
STATUS_MFR_SPECIFIC
Mask manufacturer specific faults as identified in the
STATUS_MFR_SPECIFIC byte.
5
STATUS_OTHER
Not used
4
STATUS_CML
Mask communications, memory or logic specific faults as identified in the
STATUS_CML byte.
3
STATUS_TEMPERATURE
Mask temperature specific faults as identified in the STATUS_TEMPERATURE
byte
2
STATUS_INPUT
Mask input specific faults as identified in the STATUS_INPUT byte
1
STATUS_IOUT
Mask output current specific faults as identified in the STATUS_IOUT byte
0
STATUS_VOUT
Mask output voltage specific faults as identified in the STATUS_VOUT byte
FN8789 Rev.0.00
Jun 7, 2018
Meaning
Page 93 of 116
ISL68300
7. PMBus Command Detail
TEMPCO_CONFIG (DCh)
Definition: Configures the correction factor and temperature measurement source when performing temperature
coefficient correction for current sense. TEMPCO_CONFIG values range from 0 to 127, representing 0 to 12700 parts
per million (ppm) temperature coefficient of resistance. In other words, for Temperature Coefficient (TC) enter values
in hundreds of ppm. TEMPCO_CONFIG should be set to 3900ppm (39d, 27h) when using inductor DCR current
sensing in order to compensate for the variation in inductor resistance due to the temperature coefficient of copper.
Values outside of the range are not accepted.
Data Length in Bytes: 1
Data Format: Bit Field
Type: R/W
Protectable: Yes
Units: ppm/°C
Default Value: A7h (External temperature sensor, 3900ppm/°C - copper)
Equation: In order to apply the proper temperature compensation to the current sensing element, enter the temperature
coefficient in hundreds of parts per million (ppm) in Bits 6:0 as shown below. The ISL68300 automatically
compensates the value of IOUT_CAL_GAIN so that current sense readings remain accurate throughout the circuit’s
operating temperature range. The value entered for IOUT_CAL_GAIN represents the resistance of the current sensing
element at +25°C, and is the value of DC resistance in the output inductor in DCR current sensing applications. The
ideal value for Temperature compensation for copper wire is 3900ppm/°C (27h), however each application should be
characterized to determine the actual temperature compensation value for each application.
Bit 7 selects either the IC internal temperature or external temperature for temperature compensation. An external
temperature reading, with the temperature sensing 2N3904 junction as close as possible to the output inductor as
possible.
The ISL68300 uses the Temperature Coefficient to adjust the value used for IOUT_CAL_GAIN when calculating
output current using the following equation:
IOUT_CAL_GAIN (compensated) = IOUT_CAL_GAIN(25°C) * (1 + (Temperature Coefficient/106) * (Measured
Temperature - 25)
Range: 0 to 12700ppm/˚C
Command
TEMPCO_CONFIG (DCh)
Format
Bit Field
Bit Position
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
1
1
Function
See Following Table
Default Value
Bits
7
6:0
1
0
Purpose
Selects the temp sensor source for tempco
correction
Sets the tempco correction in units of
100ppm/˚C for IOUT_CAL_GAIN
FN8789 Rev.0.00
Jun 7, 2018
1
Value
0
0
Description
0
Selects the internal temperature sensor
1
Selects the TEMP/TRK pin for temperature measurements (2N3904
Junction)
Note that TEMP must be enabled in USER_CONFIG, bit 1.
TC
RSEN (DCR) = IOUT_CAL_GAIN x (1+TC x (T-25))
where RSEN = resistance of sense element
Page 94 of 116
ISL68300
7. PMBus Command Detail
DEADTIME(DDh)
Definition: Sets the non-overlap between PWM transitions using a 2 byte data field. The most significant byte controls
the high-side to low-side deadtime value as a single 2’s-complement signed value in units of ns. The least-significant
byte controls the low-side to high-side deadtime value. Negative values are not allowed.
Data Length in Bytes: 2
Data Format: Two 2’s complement bytes (linear-8 signed)
Type: R/W
Protectable: Yes
Default Value: 1414h (20ns/20ns)
Units: ns
Range: 0 to 60ns
Command
DEADTIME (DDh)
Format
Linear-11
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
Default Value
High to low-side deadtime 8 bit 2’s complement signed
0
FN8789 Rev.0.00
Jun 7, 2018
0
0
1
0
1
0
0
Low to high-side deadtime 8 bit 2’s complement signed
0
0
0
1
0
1
0
0
Page 95 of 116
ISL68300
7. PMBus Command Detail
ASCR_CONFIG (DFh)
Definition: Allows user configuration of ASCR settings. ASCR gain and residual value are automatically set by the
ISL68300 based on input voltage and output voltage. ASCR Gain is analogous to bandwidth, ASCR Residual is
analogous to damping. To improve load transient response performance, increase ASCR Gain. To lower transient
response overshoot, increase ASCR Residual. Increasing ASCR gain can result in increased PWM jitter and should be
evaluated in the application circuit. Excessive ASCR gain can lead to excessive output voltage ripple. Increasing
ASCR Residual to improve transient response damping can result in slower recovery times, but does not affect the
peak output voltage deviation. Typical ASCR Gain settings range from 100 to 1000, and typical ASCR Residual
settings range from 10 to 90.
Data Length in Bytes: 4
Data Format: Bit Field and non-signed binary
Type: Block R/W
Protectable: Yes
Default Value: 644F0190h (Integral Gain = 100, Residual = 90, ASCR Gain = 400)
Units: N/A
Command
ASCR_CONFIG (DFh)
Format
Bit Field
Bit Position
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
1
1
0
0
1
0
0
0
1
0
0
1
1
1
1
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
1
0
0
0
0
Function
Default
Value
Integral Gain
ASCR Residual
Format
Bit Field
Function
Default
Value
ASCR Gain
0
0
Bits
0
0
Purpose
0
0
0
1
1
Value
Description
31:24
Integral Gain
0-7Fh
Error signal gain
23:16
ASCR residual
0-7Fh
ASCR residual
15:0
ASCR gain
0-FFh
ASCR gain
FN8789 Rev.0.00
Jun 7, 2018
Page 96 of 116
ISL68300
7. PMBus Command Detail
SEQUENCE (E0h)
Definition: Identifies the Rail DDC ID of the prequel and sequel rails when performing multi-rail sequencing. The
device enables its output when its EN or OPERATION enable state, as defined by ON_OFF_CONFIG, is set and the
prequel device has issued a power-good event on the DDC bus as a result of the prequel’s Power-Good (PG) signal
going high. The device disables its output (using the programmed delay values) when the sequel device has issued a
power-down event on the DDC bus at the completion of its ramp-down (its output voltage is 0V).
The data field is a two-byte value. The most significant byte contains the 5-bit Rail DDC ID of the prequel device. The
least significant byte contains the 5-bit Rail DDC ID of the sequel device. The most significant bit of each byte
contains the enable of the prequel or sequel mode.
Fault spreading is not automatic in devices that have a prequel or sequel. When a device shuts down due to a fault, it
does not disable its output and does not send a message to its sequel or prequel to disable. If fault spreading behavior is
desired, the DDC_GROUP or LEGACY_FAULT_GROUP commands should be used. Automatic fault retry is not
supported for fault spreading or sequencing groups.
A device that is tracking another device (tracking the signal on its VTRK pin, see “TRACK_CONFIG (E1h)” on
page 98), cannot be a sequel or prequel in a sequencing group.
Data Length in Bytes: 2
Data Format: Bit Field
Type: R/W
Protectable: Yes
Default Value: 00h (prequel and sequel disabled)
Units: N/A
Command
SEQUENCE (E0h)
Format
Bit Field
Bit Position
15
14
13
12
11
10
9
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
15
0
0
Field Name
Prequel Enable
14:13
Not Used
12:8
Prequel Rail DDC ID
7
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
See Following Table
Default Value
Bits
8
Sequel Enable
6:5
Not Used
4:0
Sequel Rail DDC ID
FN8789 Rev.0.00
Jun 7, 2018
0
0
0
0
0
0
0
0
Value
Setting
0
Disable
Disable, no prequel preceding this rail
Description
1
Enable
Enable, prequel to this rail is defined by Bits 12:8
0
Not Used
0-31d
DDC ID
Set to the DDC ID of the prequel rail
0
Disable
Disable, no sequel following this rail
1
Enable
Enable, sequel to this rail is defined by Bits 4:0
0
Not Used
0-31d
DDC ID
Not used
Not used
Set to the DDC ID of the sequel rail
Page 97 of 116
ISL68300
7. PMBus Command Detail
TRACK_CONFIG (E1h)
Definition: Configures the voltage tracking modes of the device. When tracking, the TOFF_DELAY in the tracking
device must be greater than TOFF_DELAY + TOFF_FALL in the device being tracked. When configured to track,
VOUT_COMMAND must be set to the desired steady state output voltage. Devices that are providing the VTRK
signal and the tracking device must have their EN pins tied together. If PMBus enabling is used using the
OPERATION command, the DDC_GROUP must be configured on both devices with the same
BROADCAST_OPERATION group ID (Bits 12:8) and have BROADCAST_OPERATION response enabled (Bit 13
set to 1).
Pre-biased tracking: The device tracking the voltage applied to the VTRK pin (called the “tracker”) slews to whatever
voltage is present at the VTRK pin when the tracker is enabled. Depending on how much pre-bias voltage is present on
the VTRK pin, the output voltage may overshoot, or an overcurrent fault may occur as the device attempts to rapidly
track to this voltage. For this reason, it is recommended that prebias voltage on the VTRK pin be no more than 20% of
the tracker’s desired steady state output voltage.
Sequencing: A tracking device cannot be part of a sequencing group; it cannot be a prequel or sequel.
Margining: VOUT_MARGIN_HIGH and VOUT_MARGIN_LOW do not apply to devices that are tracking.
Data Length in Bytes: 1
Data Format: Bit Field
Type: R/W
Protectable: Yes
Default Value: 00h (tracking disabled)
Units: N/A
Command
TRACK_CONFIG (E1h)
Format
Bit Field
Bit Position
7
6
5
Access
R/W
R/W
R/W
Function
Default Value
Bits
7
6:3
Field Name
Voltage Tracking
Control
Not Used
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
0
0
0
See Following Table
0
0
0
0
0
Value
Setting
0
Disable
Tracking is disabled.
Description
1
Enable
Tracking is enabled.
000
Not Used
100%
Output tracks at 100% ratio of VTRK input.
Not used
2
Tracking Ratio
Control
0
1
50%
Output tracks at 50% ratio of VTRK input.
1
Target Limit
0
Target Voltage
Output voltage is limited by target voltage.
1
VTRK Voltage
Output voltage is limited by VTRK voltage.
0
Not Used
0
Not Used
FN8789 Rev.0.00
Jun 7, 2018
Not used
Page 98 of 116
ISL68300
7. PMBus Command Detail
DDC_GROUP (E2h)
Definition: Rails (output voltages) are assigned Group numbers to share specified behaviors. The DDC_GROUP
command configures fault spreading group ID and enable, broadcast OPERATION group ID and enable, and broadcast
VOUT_COMMAND group ID and enable. Note that DDC Groups are separate and unique from DDC Rail IDs (see
“DDC_CONFIG (D3h)” on page 87). Current sharing rails must be in the same DDC Group to respond to broadcast
VOUT_COMMAND and OPERATION commands.
Devices in a current sharing rail are not required to have the same POWER_FAIL group ID. Faults are automatically
spread when a device is configured to be part of a current sharing rail. If you want a current sharing rail to spread faults
with another rail, all the devices in that current sharing rail should have the same POWER_FAIL group ID as the rail it
is expected to share POWER_FAIL faults with. Automatic fault retry behavior is not supported for fault
spreading or sequencing groups.
When a device is set to ignore DDC GROUP messages, the device still transmits DDC messages with its own DDC ID.
Note that the default DDC_GROUP ID is set to 0d, which is a valid DDC_GROUP number, so even a device with the
default setting (ignore all DDC groups, all DDC group IDs set to 0d) still transmits DDC GROUP messages, despite
ignoring DDC_GROUP messages from other devices on the DDC bus.
Data Length in Bytes: 34
Data Format: Bit Field
Type: Block R/W
Protectable: Yes
Default Value: 001F1F1Fh (DDC groups not used)
Units: N/A
Command
DDC_GROUP (E2h)
Format
Bit Field
Bit Position
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
Default
Value
Not Used
0
0
0
0
0
0
EN>
0
Format
15
14
Access
R/W
R/W
Default
Value
Not Used
0
Bits
31:22
0
0
0
1
1
1
1
1
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
Bit Field
Bit Position
Function
0
VOUT_COMMAND Group ID
0
13
12
R/W
R/W
EN>
0
11
10
9
8
7
6
R/W
R/W
R/W
R/W
R/W
R/W
OPERATION Group ID
1
Purpose
1
1
1
Not Used
1
Value
0
0
EN>
0
Power Fail Group ID
1
1
1
1
Description
Not Used
00
BROADCAST_VOUT_COMMAND
response
1
Responds to broadcast VOUT_COMMAND with same Group ID
0
Ignores broadcast VOUT_COMMAND
20:16
BROADCAST_VOUT_COMMAND
group ID
0-31d
15:14
Not Used
00
Not used
BROADCAST_OPERATION response
1
Responds to broadcast OPERATION with same Group ID
0
Ignores broadcast OPERATION
21
13
FN8789 Rev.0.00
Jun 7, 2018
1
Not used
Group ID sent as data for broadcast VOUT_COMMAND events
Page 99 of 116
ISL68300
7. PMBus Command Detail
Bits
12:8
7:6
5
4:0
Purpose
Value
BROADCAST_OPERATION group ID
Description
0-31d
Group ID sent as data for broadcast OPERATION events
Not Used
00
Not used
POWER_FAIL response
1
Responds to POWER_FAIL events with same Group ID
0
Ignores POWER_FAIL events with same Group ID
POWER_FAIL group ID
0-31d
Group ID sent as data for broadcast POWER_FAIL events
STORE_CONTROL (E3h)
Definition: Used to store command settings in the USER and DEFAULT Stores while the device is enabled. Used in
conjunction with STORE_DATA.
Data Length in Bytes: 11
Data Format: Bit Field
Type: R/W
Protectable: Yes
Default Value: N/A
Units: N/A
Command
STORE_CONTROL (E3h)
Format
Bit Field
Bit Position
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
N/A
N/A
N/A
Function
See Following Table
Default Value
Bits
7:4
N/A
Field Name
Store to be read or written to
N/A
N/A
Value
Command
FN8789 Rev.0.00
Jun 7, 2018
N/A
Description
0001
User Store
0010
Default Store
0000, 0011-1111
3:0
N/A
Not Used
0000
Read Store
0001
Erase Store
0010
Start Write
0011
End Write
0100-1111
Not Used
Page 100 of 116
ISL68300
7. PMBus Command Detail
DEVICE_ID (E4h)
Definition: Returns the 16-byte (character) device identifier string. The format is: Part Number, Release Type Letter,
Major Revision, Minor Revision.
Data Length in Bytes: 16
Data Format: ASCII. ISO/IEC 8859-1
Type: Block Read
Protectable: Yes (read only)
Default Value: ISL68300, current release type letter, current major revision, current minor revision
Units: N/A
Command
DEVICE_ID (E4h)
Format
Characters (Bytes)
Characters
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Function
Minor
Revision
Major
Revision
Default Value
1
1
0
0
Rel.
Type
G
Part Number
-
0
-
0
0
3
8
6
L
S
I
* Current revision at time of manufacture
FN8789 Rev.0.00
Jun 7, 2018
Page 101 of 116
ISL68300
7. PMBus Command Detail
MFR_IOUT_OC_FAULT_RESPONSE (E5h)
Definition: Configures the IOUT overcurrent fault response as defined by the table below. The command format is the
same as the PMBus standard fault responses except that it sets the overcurrent status bit in STATUS_IOUT. The retry
time is the time between restart attempts.
Data Length in Bytes: 1
Data Format: Bit Field
Type: R/W
Protectable: Yes
Default Value: 80h (immediate shutdown, no retries)
Units: Retry time unit = 35ms
Command
MFR_IOUT_OC_FAULT_RESPONSE (E5h)
Format
Bit Field
Bit Position
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
0
0
0
0
0
Function
See Following Table
Default Value
Bits
7:6
5:3
Field Name
Value
0
0
Description
Response behavior, for all
modes, the device:
• Pulls SALRT low
• Sets the related fault bit in the
status registers. Fault bits are
only cleared by the
CLEAR_FAULTS command.
00
Not used
01
Not used
10
Disable without delay and retry according to the setting in Bits 5:3.
11
Not used.
Retry Setting
000
No retry. The output remains disabled until the fault is cleared.
001-110 Not used
111
2:0
Retry Delay
FN8789 Rev.0.00
Jun 7, 2018
Attempts to restart continuously, without checking if the fault is still present, until it
is commanded OFF (by the CONTROL pin or OPERATION command or both),
bias power is removed, or another fault condition causes the unit to shut down.
The time between the start of each attempt to restart is set by the value in
Bits [2:0] multiplied by 35ms.
000-111 Retry delay time = (Value +1)*35ms. Sets the time between retries in 35ms
increments. Range is 35ms to 280ms.
Page 102 of 116
ISL68300
7. PMBus Command Detail
MFR_IOUT_UC_FAULT_RESPONSE (E6h)
Definition: Configures the IOUT undercurrent fault response as defined by the table below. The command format is the
same as the PMBus standard fault responses except that it sets the undercurrent status bit in STATUS_IOUT. The retry
time is the time between restart attempts.
Data Length in Bytes: 1
Data Format: Bit Field
Type: R/W
Protectable: Yes
Default Value: 80h (Immediate shutdown, no retries)
Units: Retry time unit = 35ms
Command
MFR_IOUT_UC_FAULT_RESPONSE (E6h)
Format
Bit Field
Bit Position
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
0
0
0
0
0
Function
See Following Table
Default Value
Bits
7:6
5:3
Field Name
Value
0
Description
Response behavior, for all modes, the
device:
• Pulls SALRT low
• Sets the related fault bit in the status
registers. Fault bits are only cleared by
the CLEAR_FAULTS command.
00
Not used
01
Not used
10
Disable without delay and retry according to the setting in Bits 5:3.
11
Not used
Retry Setting
000
001-110
111
2:0
0
Retry Delay
FN8789 Rev.0.00
Jun 7, 2018
000-111
No retry. The output remains disabled until the fault is cleared.
Not used
Attempts to restart continuously, without checking if the fault is still
present, until it is commanded OFF (by the CONTROL pin or
OPERATION command or both), bias power is removed, or another fault
condition causes the unit to shut down. The time between the start of
each attempt to restart is set by the value in Bits [2:0].
Retry delay time = (Value +1)*35ms. Sets the time between retries in
35ms increments. Range is 35ms to 280ms.
Page 103 of 116
ISL68300
7. PMBus Command Detail
IOUT_AVG_OC_FAULT_LIMIT (E7h)
Definition: Sets the IOUT average overcurrent fault threshold. For down-slope sensing, this corresponds to the
average of all the current samples taken during the (1-D) time interval, excluding the Current Sense Blanking time
(which occurs at the beginning of the 1-D interval). For up-slope sensing, this corresponds to the average of all the
current samples taken during the D time interval, excluding the Current Sense Blanking time (which occurs at the
beginning of the D interval). This feature shares the OC fault bit operation (in STATUS_IOUT) and OC fault response
with IOUT_ OC_FAULT_LIMIT. Values outside of the range are not accepted.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Linear-11.
Type: R/W
Protectable: Yes
Default Value: E230h (35A)
Units: A
Equation: IOUT_AVG_OC_FAULT_LIMIT = Y × 2N
Range: 0A to 100A
Command
IOUT_AVG_OC_FAULT_LIMIT (E7h)
Format
Linear-11
Bit Position
15
Access
R/W
Function
Default Value
14
13
12
11
10
9
8
7
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Signed Exponent, N
1
FN8789 Rev.0.00
Jun 7, 2018
1
1
0
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Signed Mantissa, Y
0
0
1
0
0
0
1
1
0
0
0
0
Page 104 of 116
ISL68300
7. PMBus Command Detail
IOUT_AVG_UC_FAULT_LIMIT (E8h)
Definition: Sets the IOUT average undercurrent fault threshold. For down-slope sensing, this corresponds to the
average of all the current samples taken during the (1-D) time interval, excluding the Current Sense Blanking time
(which occurs at the beginning of the 1-D interval). For up-slope sensing, this corresponds to the average of all the
current samples taken during the D time interval, excluding the Current Sense Blanking time (which occurs at the
beginning of the D interval). This feature shares the UC fault bit operation (in STATUS_IOUT) and UC fault response
with IOUT_ UC_FAULT_LIMIT. Values outside of the range are not accepted.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Linear-11
Type: R/W
Protectable: Yes
Default Value: E5D0h (-35A)
Units: A
Equation: IOUT_AVG_UC_FAULT_LIMIT = Y × 2N
Range: -100A to 0 A
Command
IOUT_AVG_UC_FAULT_LIMIT (E8h)
Format
Linear-11
Bit Position
15
Access
R/W
Function
Default Value
14
13
12
11
10
9
8
7
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Signed Exponent, N
1
FN8789 Rev.0.00
Jun 7, 2018
1
1
0
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Signed Mantissa, Y
0
1
0
1
1
1
0
1
0
0
0
0
Page 105 of 116
ISL68300
7. PMBus Command Detail
SNAPSHOT (EAh)
Definition: A 32-byte read-back of parametric and status values. It allows monitoring and status data to be stored to
flash either during a fault condition or through a system-defined time using the SNAPSHOT_CONTROL command.
Snapshot is continuously updated in RAM and can be read using the SNAPSHOT command. When a fault occurs, the
latest snapshot in RAM is stored to flash. Snapshot data can read back by writing a 01h to the
SNAPSHOT_CONTROL command, then reading SNAPSHOT.
Data Length in Bytes: 32
Data Format: Bit Field
Type: Block Read
Protectable: Yes (read only)
Default Value: N/A
Units: N/A
Byte
Value
PMBus Command
Format
31:30
Duty Cycle
READ_DUTY_CYCLE (94h)
2 Byte Linear-11
29:28
Switching Frequency
READ_FREQUENCY (95h)
2 Byte Linear-11
27:26
External Temperature 2 (TMON)
READ_TEMPERATURE_3 (8Fh)
2 Byte Linear-11
25:24
External Temperature 1
READ_TEMPERATURE_2 (8Eh)
2 Byte Linear-11
23:22
Internal Temperature
READ_TEMPERATURE_1 (8Dh)
2 Byte Linear-11
21
Manufacturer Specific Status Byte
STATUS_MFR_SPECIFIC (80h)
1 Byte Bit Field
20
CML Status Byte
STATUS_CML (7Eh)
1 Byte Bit Field
19
Temperature Status Byte
STATUS_TEMPERATURE (7Dh)
1 Byte Bit Field
18
Input Status Byte
STATUS_INPUT (7Ch)
1 Byte Bit Field
17
IOUT Status Byte
STATUS_IOUT (7Bh)
1 Byte Bit Field
16
VOUT Status Byte
STATUS_VOUT (7Ah)
1 Byte Bit Field
15:14
Highest Measured Output Current
N/A (Peak measured output current)
2 Byte Linear-11
13:12
Output Current
READ_IOUT (8Ch)
2 Byte Linear-11
11:10
Output Voltage
READ_VOUT (8Bh)
2 Byte Linear-16 Unsigned
9:8
Input Voltage
READ_VIN (88h)
2 Byte Linear-11
7:6
All Faults
N/A
2 Byte Bit Field
5
First Fault
N/A
1 Byte Bit Field
Uptime
N/A
4 Byte Integer
Flash Memory Status Byte
N/A
1 Byte Bit Field
4:1
0
First Fault
Bit Number
Status Bit Name
7:4
Not Used
3
IOUT_PEAK_OC
2
IOUT_AVG_OC
1
VOUT_OV
Output overvoltage was the first fault
0
VIN_UV
Input undervoltage was the first fault
FN8789 Rev.0.00
Jun 7, 2018
Meaning
Not Used
Peak output overcurrent was the first fault
Average output overcurrent was the first fault
Page 106 of 116
ISL68300
7. PMBus Command Detail
All Faults
Bit Number
Status Bit Name
Meaning
15
Fault Phase
A DDC rail fault occurred
14
Fault Group
A DDC group fault occurred
13
Fault CPU
12
Fault UT
An under-temperature fault occurred
11
Fault OT
An over-temperature fault occurred
10
Fault peak OC
A peak output overcurrent fault occurred
9
Fault peak UC
A peak output undercurrent fault occurred
8
Fault EN pin as fault bus
7
Fault VIN_OV
6
Fault VOUT_OV
An output overvoltage fault occurred
5
Fault VOUT_UV
An output undervoltage fault occurred
4
Not Used
Not Used
3
Fault Sync
A loss of clock synchronization fault occurred
A CPU fault occurred
The EN pin was pulled low in response to a fault
An input overvoltage fault occurred
2
Fault VIN_UV
1
Fault IOUT_OC
An average output overcurrent fault occurred
An input undervoltage fault occurred
0
Fault IOUT_UC
An average output undercurrent fault occurred
BLANK_PARAMS (EBh)
Definition: Returns a 32-byte string that indicates which parameter values were retrieved by the last RESTORE
operation or have been written since that time. Read BLANK_PARAMS immediately after a restore operation to
determine which parameters are in that store. A one indicates the parameter is not present and has not been written
since the RESTORE operation. The 32-byte string, consisting of 256 bits, corresponds to the 256 possible PMBus
commands: from 00h to FFh. Each bit references a PMBus command by command number, for example
ON_OFF_CONFIG, command 02h corresponds to Bit 2. If the setting of ON_OFF_CONFIG was changed and stored
in the USER or DEFAULT stores, the last two bytes of BLANK_PARAMS would be 1111 1011.
Data Length in Bytes: 32
Data Format: Bit Field
Type: Block Read
Protectable: Yes (read only)
Default Value: FF…FFh
Units: N/A
FN8789 Rev.0.00
Jun 7, 2018
Page 107 of 116
ISL68300
7. PMBus Command Detail
LEGACY_FAULT_GROUP (F0h)
Definition: Allows the ISL68300 to sequence and fault spread with devices other than the ISL683xx and ZL880x
families of ICs. This command sets which rail DDC IDs should be listened to for fault spreading information. The data
sent is a 4-byte, 32-bit vector in which every bit represents a rail’s DDC ID. A bit set to 1 indicates a device DDC ID to
which the configured device responds upon receiving a fault spreading event. In this vector, bit 0 of byte 0 corresponds
to the rail with DDC ID 0. Following through, Bit 7 of Byte 3 corresponds to the rail with DDC ID 31.
NOTE: The device/rail’s own DDC ID should not be set within the LEGACY_FAULT_GROUP command for that
device/rail.
All devices in a current share rail (devices other than the ISL683xx and ZL880x family ICs) must shut down for the
rail to report a shutdown. If fault spread mode is enabled in USER_CONFIG, the device shuts down immediately if one
of its DDC_GROUP members fails. Automatic fault retry behavior is not supported for fault spreading or
sequencing groups.
If fault spread mode is disabled in USER_CONFIG, the device performs a sequenced shutdown as defined by the
SEQUENCE command setting. The rails/devices in a sequencing set attempt their configured restart only after all
faults have cleared within the DDC_GROUP. If fault spread mode is disabled and sequencing is also disabled, the
device ignores faults from other devices and stays enabled.
Data Length in Bytes: 4
Data Format: Bit Field
Type: Block R/W
Protectable: Yes
Default Value: 00000000h (no fault spreading with legacy devices)
Units: N/A
Command
LEGACY_FAULT_GROUP (F0h)
Format
Bit Field
Bit Position
31
30
29
28
27
26
25
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
24
23
22
21
20
19
18
17
16
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
See Following Table
Default
Value
0
0
0
0
0
0
0
0
Format
0
Bit Field
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
0
0
0
0
0
Function
Default
Value
See Following Table
Bits
Field Name
Value
Setting
31:0
Fault Group
N/A
00000000h
FN8789 Rev.0.00
Jun 7, 2018
0
0
0
Description
Identifies the devices in the fault spreading group.
Page 108 of 116
ISL68300
7. PMBus Command Detail
STORE_DATA (F2h)
Definition: Stores the command settings in the USER and/or DEFAULT stores while the device is enabled. Used in
conjunction with STORE_CONTROL (E3h). This command indicates to the device that the next 4 bytes are PMBus
command codes and/or data. STORE_DATA commands, along with their 4 bytes of data, are repeatedly sent to the
device until all configuration commands and data have been sent to the device. If the data that needs to be sent results
in a STORE_DATA command that would have less than 4 bytes, the unused bytes should be filled with FFh. Note that
these “filler” bytes are used when the CRC is calculated.
Data Length in Bytes: 4
Data Format: Custom
Type: R/W
Protectable: Yes
Default Value: N/A
Units: N/A
SNAPSHOT_CONTROL (F3h)
Definition: Controls, configures, and erases SNAPSHOT data. As shown in the following table, this command is used
to arm and disarm SNAPSHOT, report back the number of SNAPSHOT data record locations that are available for
new data, select the data record to read back, specify whether a single or multiple SNAPSHOT should be taken after a
device as been disabled, if a SNAPSHOT can only be taken when the device is enabled, enabling and disabling
SNAPSHOT_CONTROL, and erasing all SNAPSHOT data.
The Erase All bit must be sent as a separate command. All other bits are ignored when the Erase All bit is sent. For
example, 0000 0000 0000 0010b and 1111 1111 1111 1111b both (only) erase all SNAPSHOT data. The hose must wait
at least 20ms before issuing any other PMBus commands after writing the Erase All bit.
Data Length in Bytes: 2
Data Format: Bit Field
Type: R/W
Protectable: Yes
Default Value: 0800h
Units: N/A
Command
SNAPSHOT_CONTROL (F3h)
Format
Bit Field
Bit Position
15
14
13
12
11
10
9
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
Default Value
Bits
15
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
See Following Table
0
0
Field Name
Snapshot Armed
14:12 Not Used
11:8
8
Available Snapshots
remaining
FN8789 Rev.0.00
Jun 7, 2018
0
0
0
0
0
0
0
0
Value
Setting
0
Disabled
Not Armed
Description
1
Enabled
Armed. Snapshot happens on next fault (provided it is not masked)
000
Not Used
Not used
00001000
N/A
Number of 8 byte SNAPSHOT records available
Page 109 of 116
ISL68300
Bits
7
7. PMBus Command Detail
Field Name
Setting
Description
0
Disabled
Snapshot is taken whenever a fault occurs
1
Enabled
One Snapshot is taken when a fault occurs. Another Snapshot is not
taken until the device has been disabled.
0
Disabled
Snapshot may be taken at any time.
1
Enabled
Snapshot is only taken when the device is enabled (“turned on”)
0
Not used
Not used
000111
NA/
Specifies which SNAPSHOT data record to return when the SNAPSHOT
command is read.
Erases all SNAPSHOT data. This causes Available Snapshots
Remaining to become 8 (1000d) THIS BIT MUST BE SENT AS A
SEPARATE COMMAND; such as, not combined with other bit settings.
One TIme
6
After Enable
5
Not used
4:2
Value
Read Location
1
Erase All
1
(Write Only)
0
Enable
0
Disabled
Disables SNAPSHOT_CONTROL
1
Enabled
Enables SNAPSHOT_CONTROL
RESTORE_FACTORY (F4h)
Definition: Restores the device to the hard coded factory default values and pin-strap definitions. The device retains
the DEFAULT and USER stores for restoring. Security level is changed to Level 1 following this command.
Data Length in Bytes: 0
Data Format: N/A
Type: Write only
Protectable: Yes
Default Value: N/A
Units: N/A
PINSTRAP_READ_STATUS (F5h)
Definition: A 5-byte read-back of an index from 0 to 31 that corresponds to the resistor value for the designated
pin-strap position.
Data Length in Bytes: 5
Data Format: Bit Field
Type: Block Read
Protectable: Yes (read only)
Default Value: N/A
Units: N/A
Byte
Value
Format
Byte 4
Reserved
8-Bit Integer
Byte 3
Reserved
8-Bit Integer
Byte 2
SYNC resistor index
8-Bit Integer
Byte 1
Factory Mode
8-Bit Integer
Byte 0 Bits 7:3
VSET/SA VSET resistor index
5-Bit Integer
Byte 0 Bits 2:0
VSET/SA Address resistor index
3-Bit Integer
FN8789 Rev.0.00
Jun 7, 2018
Page 110 of 116
ISL68300
7. PMBus Command Detail
IIN_CAL_OFFSET (F6h)
Definition: Used to account for input current that is consumed by bias currents which would not be consumed by the
power supply’s power train. Values outside of the range are not accepted.
Data Length in Bytes: 2
Data Format: Linear-11
Type: R/W
Protectable: Yes
Default Value: 8BD7h (0.03A)
Units: A
Range: -10A to 10A
Equation: IIN_OFFSET = Y × 2N
Command
IIN_OFFSET (F6h)
Format
Linear-11
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
1
1
1
Function
Default Value
Signed Exponent, N
1
FN8789 Rev.0.00
Jun 7, 2018
0
0
0
Signed Mantissa, Y
1
0
1
1
1
1
0
1
Page 111 of 116
ISL68300
7. PMBus Command Detail
SECURITY_CONTROL (FAh)
Definition: Reads back the security status of the USER and DEFAULT stores, clears protection status of non-password
protected commands, and enables the automatic command protection mode (Auto Protect Mode).
SECURITY_CONTROL is used along with the PASSWORD and WRITE_PROTECT commands to allow the user to
disallow changes to selected commands.
Data Length in Bytes: 1
Data Format: Bit
Type: Read Byte
Protectable: No
Default Value: 01h
Units: N/A
Command
SNAPSHOT_CONTROL (F3h)
Format
Bit Field
Bit Position
7
6
5
4
3
2
1
0
Access
Read
Read
Read
Read
Read
Read
R/W
R/W
0
0
0
0
0
0
Function
See Following Table
Default Value
Bits
7:6
Field Name
0
Value
0
Description
Not used
00
Not used
5
DEFAULT store protected
0
1 indicates that the DEFAULT store is protected.
4
USER store protected
0
1 indicates that the USER store is protected.
Not used
00
Not used.
1
Clear protected
0
Writing a “1” clears all protected commands except the commands
that are password protected.
0
Auto protect
0
Writing a “1” enables auto protection mode.
3:2
PASSWORD (FBh)
Definition: Sets the password string for the USER and DEFAULT stores. The USER and DEFAULT stores can have
unique passwords. The initial (default) password for both stores is null (9 bytes of zeroes in hexidecimal format - not 9
ASCII “0” characters). The DEFAULT store password has priority over the USER store password. That is, when the
DEFAULT store password is written, protected commands in both the DEFAULT and USER stores can be written to.
Data Length in Bytes: 9
Data Format: ASCII. ISO/IEC 8859-1
Type: Block Write
Protectable: No
Default Value: 000000000000000000h (null)
Units: N/A
FN8789 Rev.0.00
Jun 7, 2018
Page 112 of 116
ISL68300
7. PMBus Command Detail
WRITE_PROTECT (FDh)
Definition: Sets a 256-bit (32-byte) parameter that identifies which commands are to be protected against
write-access. Each bit in this parameter corresponds to a command according to the command’s code. The command
with a code of 00h (PAGE - not used in this device) is protected by the least-significant bit of the least-significant byte,
followed by the command with a code of 01h and so forth. Note that all possible commands have a corresponding bit
regardless of whether they are can be protected or are supported by the device. Setting a command’s
WRITE_PROTECT bit to “1” indicates that write-access to that command is only allowed if the appropriate password
has been written to the device. Note that the USER and DEFAULT stores have unique passwords, and that writing the
DEFAULT store password allows changes to both the USER and DEFAULT stores.
Data Length in Bytes: 32
Data Format: Custom
Type: Block R/W
Protectable: Yes
Default Value: 00…00h
Units: N/A
FN8789 Rev.0.00
Jun 7, 2018
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ISL68300
8.
8. Revision History
Revision History
Rev.
Date
0.00
Jun 7, 2018
FN8789 Rev.0.00
Jun 7, 2018
Description
Initial release
Page 114 of 116
ISL68300
9.
9. Package Outline Drawing
Package Outline Drawing
For the most recent package outline drawing, see L24.4x4H.
L24.4x4H
24 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE
Rev 0, 09/11
2.50
4.00
20X 0.50
A
B
6
PIN 1
INDEX AREA
18
4.00
(4X)
6
24
19
PIN #1 INDEX AREA
1
Exp. DAP
2.50 ±0.05 Sq.
2.50
6
13
0.15
0.10 M C A B
24X 0.25 +0.07 4
-0.05
TOP VIEW
7
12
24X 0.40 ±0.10
0.25 min (4 sides)
BOTTOM VIEW
SEE DETAIL "X"
C
0.10 C
0.90 ±0.10
0 . 2 REF
5
C
SEATING PLANE
0.08 C
0 . 00 MIN.
0 . 05 MAX.
SIDE VIEW
DETAIL "X"
( 3.80 )
( 2.50)
NOTES:
1.
Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2. Dimensioning and tolerancing conform to AMSEY14.5m-1994.
( 20X 0.50)
( 3.80 )
( 2.50 )
3.
Unless otherwise specified, tolerance : Decimal ± 0.05
4.
Dimension applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
5. Tiebar shown (if present) is a non-functional feature.
(24X .25)
6.
( 24 X 0.60)
The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 identifier may be
either a mold or mark feature.
7. Compliant to JEDEC MO-220 VGGD-8
TYPICAL RECOMMENDED LAND PATTERN
FN8789 Rev.0.00
Jun 7, 2018
Page 115 of 116
Notice
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