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DATASHEET
ISL68200
Single-Phase R4 Digital Hybrid PWM Controller with Integrated Driver,
PMBus/SMBus/I2C, and PFM
FN8705
Rev.4.00
Jul 24, 2018
The ISL68200 is a single-phase synchronous-buck PWM
controller featuring the proprietary Renesas R4™ Technology.
The ISL68200 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 ISL68200 includes a PMBus/SMBus/I2C interface for
device configuration and telemetry (VIN, VOUT, IOUT, and
temperature) and fault reporting.
The proprietary Renesas R4 control scheme has extremely fast
transient performance, accurately regulated frequency control,
and all internal compensation. An efficiency enhancing PFM
mode greatly improves light-load efficiency. The ISL68200’s
serial bus allows for easy R4 loop optimization, resulting in
fast transient performance over a wide range of applications,
including all ceramic output filters.
Built-in MOSFET drivers minimize external components,
significantly reducing design complexity and board space,
while also lowering BOM cost. The 4A drive strength allows for
faster switching time, improving regulator efficiency. An
integrated high-side gate-to-source resistor helps avoid Miller
coupling shoot-through and improves system reliability.
The ISL68200 has four 8-bit configuration pins that 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 ISL68200
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 ISL68200 with
other voltage rails, which is especially useful for power
sequencing.
Applications
• High efficiency and high density POL digital power
• FPGA, ASIC, and memory supplies
• Datacenter servers and storage systems
• Wired infrastructure routers, switches, and optical
networking
• Wireless infrastructure base stations
Features
• Proprietary Renesas 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
• Supports 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 for improved light-load efficiency
• Startup 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
- Integrated high-side gate-to-source resistor to prevent self
turn-on due to high input bus dV/dt
• Integrated power MOSFETs 4A drivers with adaptive
shoot-through protection and bootstrap function
• Compatible with Renesas PowerNavigator™ software
Related Literature
For a full list of related documents, visit our website
ISL68200 product page
PART
NUMBER
ISL68200
ISL68201
INTEGRATED
DRIVER
Yes
No
TABLE 1. SINGLE-PHASE R4 DIGITAL HYBRID PWM CONTROLLER OPTIONS
PWM
OUTPUT
PMBus/SMBus/I2C
INTERFACE
COMPATIBLE DEVICES
No Yes Discrete MOSFETs or Dual Channel MOSFETs
Yes Yes Renesas Power Stages: ISL99140
Renesas Drivers: ISL6596, ISL6609, ISL6627, ISL6622, ISL6208
FN8705 Rev.4.00
Jul 24, 2018
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ISL68200
Table of Contents
Typical Applications Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Functional Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
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
Adaptive Shoot-Through Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
PFM Mode Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
FN8705 Rev.4.00
Jul 24, 2018
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ISL68200
Typical Applications Circuits
I2C/SMBus/
PMBus
PGOOD
EN
VCC
1.0µF
1.0µF
VCC
4
VCC
7VLDO
SALERT
SCL
SDA
PGOOD
EN
IOUT
PVCC
VIN
BOOT
4.7µF
0.1µF
UGATE
PHASE
LGATE
VCC
4.75V TO 24V
VOUT < 7VLDO - 1.7V
0.5V TO 5.5V
10k
NTC
NTC
PROG1-4
CSEN
CSRTN
VSEN
RGND
GND
1.54k
0.1µF
NCP15XH103J03RC
BETA = 3380
FIGURE 1. WIDE RANGE INPUT AND OUTPUT APPLICATIONS
I2C/SMBus/
PMBus
PGOOD
EN
VCC
1.0µF
1.0µF
VCC
4
VCC
7VLDO
SALERT
SCL
SDA
PGOOD
EN
IOUT
PVCC
VIN
BOOT
UGATE
PHASE
LGATE
NTC
PROG1-4
CSEN
CSRTN
VSEN
RGND
GND
4.7µF
0.1µF
4.5V TO 5.5V
VOUT < 7VLDO - 1.7V
0.5V TO 2.5V
VCC
10k
NTC
1.54k
0.1µF
NCP15XH103J03RC
BETA = 3380
FIGURE 2. 5V INPUT APPLICATION
FN8705 Rev.4.00
Jul 24, 2018
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ISL68200
Block Diagram
VCC
EN
PGOOD
RGND
VSEN
7VLDO VINPVCC
POR
PGOOD
CIRCUITRY
INTERNAL
+COAMMPPELNISFAIETRION
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
DRIVER
BOOT
UGATE
OVERVOLTAGE/
UNDERVOLTAGE
DEAD TIME
GENERATION
DRIVER
PHASE
PVCC
LGATE
R4
MODULATOR
5V LDO
7V LDO
OVERCURRENT (OCP) AND
OVER-TEMPERATURE (OTP)
SWITCHING
FREQUENCY
CURRENT SENSE
AND TEMPERATURE
COMPENSATION
GND
VIN
7VLDO
CSEN
CSRTN
NTC
IOUT
FIGURE 3. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM OF ISL68200
FN8705 Rev.4.00
Jul 24, 2018
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ISL68200
Pin Configuration
24 LD 4x4 QFN
TOP VIEW
24 23 22 21 20 19
EN 1
18 PROG1
VIN 2
17 PROG2
7VLDO 3
VCC 4
25
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 SYMBOL
DESCRIPTION
1 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.
2 VIN Input voltage pin for the R4 loop and LDOs (5V and 7V). Place a high quality low ESR ceramic capacitor (1.0μF, X7R) in close
proximity to the pin. An external series resistor is not advised.
3 7VLDO The 7V LDO from VIN biases the current sensing amplifier. Place a high quality low ESR ceramic capacitor (1.0μF, X7R, 10V+)
in close proximity to the pin.
4 VCC Logic bias supply that should be connected to the PVCC rail externally. Place a high quality low ESR ceramic capacitor (1.0μF,
X7R) from this pin to GND.
5 SCL Synchronous SMBus/PMBus/I2C clock signal input.
6 SALERT Output pin for transferring the active low signal driven asynchronously from the VR controller to SMBus/PMBus.
7 SDA I/O pin for transferring data signals between the SMBus/PMBus/I2C host and VR controller.
8 PGOOD Open-drain indicator output.
9 RGND Monitors the negative rail of the regulator output. Connect to ground at the point of regulation.
10 VSEN Monitors the positive rail of the regulator output. Connect to the point of regulation.
11 CSRTN Uses a series resistor to monitor the negative flow of output current for overcurrent protection and telemetry. The series
resistor sets the current gain and should be within 40Ωand 3.5kΩ.
12 CSEN Monitors the positive flow of output current for overcurrent protection and telemetry.
13 NTC Input pin for temperature measurement. Connect this pin through an NTC thermistor (10kΩ, ~ 3380) and a decoupling
capacitor (~0.1μF) to GND and a resistor (1.54kΩ)to VCC of the controller. The voltage at this pin is inversely proportional to
the VR temperature.
14 IOUT Output current monitor pin. An external resistor sets the gain and an external capacitor provides the averaging function; an
external pull-up resistor to VCC is recommended to calibrate the no load offset. See “IOUT Calibration” on page 19.
15 PROG4 Programming pin for Modulator (R4) RR impedance and output slew rate during Soft-Start (SS) and Dynamic VID (DVID).
It also sets AV gain multiplier to 1x or 2x and determines the AV gain on PROG3.
16 PROG3 Programming pin for ultrasonic PFM operation, fault behavior, switching frequency, and R4 (AV) control loop gain.
17 PROG2 Programming pin for PWM/PFM mode, temperature compensation, and serial bus (SMBus/PMBus/I2C) address.
FN8705 Rev.4.00
Jul 24, 2018
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