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DATASHEET
SPiMnBglues-P/ShMasBeuRs/4I™2CDaignidtaPlFHMybrid PWM Controller with
ISL68201
The ISL68201 is a single-phase, synchronous buck PWM
controller featuring Intersil’s proprietary R4™ Technology. It
supports a wide 4.5V to 24V input voltage range and a wide
0.5V to 5.5V output range. Integrated LDOs provide controller
bias voltage, allowing for single supply operation. The
ISL68201 includes a PMBus/SMBus/I2C interface for device
configuration and telemetry (VIN, VOUT, IOUT and temperature)
and fault reporting.
Intersil’s proprietary R4™ control scheme has extremely fast
transient performance, accurately regulated frequency control
and all internal compensation. An efficiency enhancing PFM
mode can be enabled to greatly improve light-load efficiency.
The ISL68201’s series bus allows for easy R4™ loop
optimization, resulting in fast transient performance over a
wide range of applications, including all ceramic output filters.
The ISL68201 has four 8-bit configuration pins, which provide
very flexible configuration options (frequency, VOUT, R4™ gain,
etc.) without the need for built-in NVM memory. This results in
a design flow that closely matches traditional analog
controllers, while still offering the design flexibility and feature
set of a digital PMBus/SMBus/I2C interface. The ISL68201
also features remote voltage sensing and completely eliminates
any potential difference between remote and local grounds. This
improves regulation and protection accuracy. A precision enable
input is available to coordinate the start-up of the ISL68201 with
other voltage rails, especially useful for power sequencing.
Applications
• High efficiency and high density POL digital power
• FPGA, ASIC and memory supplies
• Data center: servers, storage systems
• Wired infrastructure: routers/switches/optical networking
• Wireless infrastructure: base station
Related Literature
UG068, “ISL68201-99140DEMO1Z User Guide”
Features
• Intersil’s proprietary R4™ Technology
- Linear control loop for optimal transient response
- Variable frequency and duty cycle control during load
transient for fastest possible response
- Inherent voltage feed-forward for wide range input
• Input voltage range: 4.5V to 24V
• Output voltage range: 0.5V to 5.5V
• ±0.5% DAC accuracy with remote sense
• Support all ceramic solutions
• Integrated LDOs for single input rail solution
• SMBus/PMBus/I2C compatible, up to 1.25MHz
• 256 boot-up voltage levels with a configuration pin
• Eight switching frequency options from 300kHz to 1.5MHz
• PFM operation option, compatible with ISL99140 for
improved light-load efficiency
• Start-up into precharged load
• Precision enable input to set higher input UVLO and power
sequence as well as fault reset
• Power-good monitor for soft-start and fault detection
• Comprehensive fault protection for high system reliability
- Over-temperature protection
- Output overcurrent and short-circuit protection
- Output overvoltage and undervoltage protection
- Open remote sense protection
• Compatible with 5V or 3.3V PWM input DrMOS or Smart
Power Stage (SPS)
• Compatible with Intersil’s PowerNavigator™ software
PART
NUMBER
ISL68200
ISL68201
INTEGRATED
DRIVER
Yes
No
TABLE 1. SINGLE-PHASE R4™ DIGITAL HYBRID PWM CONTROLLER OPTIONS
PWM PMBus/SMBus/I2C
OUTPUT
INTERFACE
COMPATIBLE DEVICES
No Yes Discrete MOSFETs or Dual Channel MOSFETs
Yes Yes Intersil Power Stages:
ISL99140
Intersil Drivers:
ISL6596, ISL6609, ISL6627, ISL6622, ISL6208
March 7, 2016
FN8696.1
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2016. All Rights Reserved
Intersil (and design), R3 Technology, R4 Technology and PowerNavigator are trademarks owned by Intersil Corporation or
one of its subsidiaries.All other trademarks mentioned are the property of their respective owners.

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ISL68201
Table of Contents
Typical Applications Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Functional Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
IC Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Enable and Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Resistor Reader (Patented) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Soft-Start. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Boot-Up Voltage Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Current Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Thermal Monitoring and Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
IOUT Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Fault Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
PGOOD Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SMBus, PMBus and I2C Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
R4™ Modulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
General Application Design Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Output Filter Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Input Capacitor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Design and Layout Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Voltage Regulator Design Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
About Intersil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
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ISL68201
Typical Applications Circuits
I2C/
SMBus/
PMBus
PGOOD
EN
VCC
1 .0 µ F
1 .0 µ F
VCC
4
VCC
7VLDO
PVCC
VIN
4 .7µ F
4.75 TO 24V
SALERT
SCL
SDA
PGOOD
EN
IO U T
FCCM
PWM
LGIN
100
NTC
PROG1-4
CSEN
CSRTN
VSEN
RGND
GND
ISL99140
UG
PWM
LG
BOOT
PHASE
VCC
1.54k
10k
NTC
0 .1 µ F
NCP18XH103J03RB
BETA = 3380
VO UT < 7VLDO 1.7V
0.5V TO 5.5V
I2C/
SMBus/
PMBus
PGOOD
EN
VCC
FIGURE 1. WIDE RANGE INPUT AND OUTPUT APPLICATIONS
1.0µ F
1.0µ F
VCC
4
VCC
7VLDO
PVCC
VIN
4.7µ F
4.5 TO 5.5V
SALERT
SCL
SDA
PGOOD
EN
IOUT
FCCM
PWM
LGIN
NTC
PROG1-4
CSEN
CSRTN
VSEN
RGND
GND
ISL99140
BOOT
UG
PWM
LG
100
VCC
1.54k
PHASE
10k
NTC
0.1µF
NCP18XH103J03RB
BETA = 3380
VOUT < 7VLDO 1.7V
0.5V TO 2.5V
FIGURE 2. 5V INPUT APPLICATION
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Block Diagram
VCC
EN
PGOOD
RGND
VSEN
7VLDO VIN PVCC
POR
PGOOD
CIRCUITRY
-
INTERNAL
COMPENSATION
+ AMPLIFIER
PROG1
GND
REFERENCE
VOLTAGE
CIRCUITRY
PROG4
SCL SDA SALERT
PROG2 PROG3
SOFT-START
AND
FAULT LOGIC
OTP OCP
SMBus/PMBus/I2C
INTERFACE
VIN VOUT IOUT TEMP
FCCM
DRIVER
FCCM
OVERVOLTAGE/
UNDERVOLTAGE
PWM AND PFM
CONTROL
PWM
DRIVER
LGIN
PVCC
PWM
R4™
MODULATOR
SWITCHING
FREQUENCY
OVERCURRENT (OCP) AND
OVER-TEMPERATURE (OTP)
5V LDO
7V LDO
CURRENT SENSE
AND TEMPERATURE
COMPENSATION
GND
VIN
7VLDO
CSEN
CSRTN
NTC
IOUT
FIGURE 3. ISL68201 SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM

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ISL68201
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP RANGE
(°C)
PACKAGE
(RoHS Compliant)
PKG.
DWG. #
ISL68201IRZ
ISL 68201I
-40 to +85
24 Ld 4x4 QFN
L24.4x4C
ISL68201-99140DEMO1Z
35A Demo Board with On-Board Transient
NOTES:
1. Add “-T” suffix for 6k unit, “-T7A” suffix for 250 unit or “-TK” for 1k unit for Tape and Reel options. Please 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), please see product information page for ISL68201. For more information on MSL please see techbrief TB363.
Pin Configuration
ISL68201
(24 LD 4X4 QFN)
TOP VIEW
24 23 22 21 20 19
EN 1
18 PROG1
VIN 2
17 PROG2
7VLDO 3
VCC 4
GND
(PAD)
16 PROG3
15 PROG4
SCL 5
14 IOUT
SALERT 6
13 NTC
7 8 9 10 11 12
Functional Pin Descriptions
PIN NUMBER
1
2
3
4
5
6
7
8
9
10
11
SYMBOL
DESCRIPTION
EN Precision enable input. Pulling EN above the rising threshold voltage initiates the soft-start sequence, while pulling EN below the
failing threshold voltage suspends the Voltage Regulator (VR) operation.
VIN Input voltage pin for R4 loop and LDOs (5V and 7V). Place a high quality low ESR ceramic capacitor (1.0μF, X7R) in close
proximity to the pin. External series resistor is not advised.
7VLDO 7V LDO from VIN is used to bias current sensing amplifier. Place a high quality low ESR ceramic capacitor (1.0μF, X7R, 10V+)
in close proximity to the pin.
VCC Logic bias supply that should be connected to PVCC rail externally. Place a high quality low ESR ceramic capacitor (1μF,
X7R) from this pin to GND.
SCL Synchronous clock signal input of SMBus/PMBus/I2C.
SALERT Output pin for transferring the active low signal driven asynchronously from the VR controller to SMBus/PMBus.
SDA I/O pin for transferring data signals between SMBus/PMBus/I2C host and VR controller.
PGOOD Power-good open-drain indicator output.
RGND This pin monitors the negative rail of regulator output. Connect to ground at point of regulation.
VSEN This pin monitors the positive rail of regulator output. Connect to point of regulation.
CSRTN This pin monitors the negative flow of output current for overcurrent protection and telemetry.
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