ISL68200

Single-Phase R4 Digital Hybrid PWM Controller with Integrated Driver, PMBus/SMBus/I<sup>2</sup>C and PFM

OVERVIEW

The ISL68200 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 ISL68200 includes a PMBus/SMBus/I2 C 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 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 improve system reliability.

The ISL68200 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/I2 C 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, especially useful for power sequencing.

KEY 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 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
  • 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 Intersil’s PowerNavigator software

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL68200
Basic Information
Production Status
Mass Production
iSim Model
YES
Input Voltage Min (V)
4.5
Input Voltage Max (V)
24
Output Voltage Min (V)
0.5
Output Voltage Max (V)
5.5
Output Current Max (A)
40
Bias Voltage Range (V)
NOT REQUIRED
IQ
16 mA
Switching Freq. (min) (MHz)
0.3
Switching Freq. (max) (MHz)
1.5
Peak Efficiency (%)
94
PMBus/SMBus/I2C
Yes
Integrated MOSFET Driver(s)
Yes
Qualification Level
Standard
Dual Output
No
Dual Phase
No
Current Share
No
Switching Frequency Range (MHz)
0.3 to 1.5
Can Sample
YES
Temperature Range
-40 to +85

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