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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 (V_IN, V_OUT, I_OUT 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, V_OUT, 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.

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, 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

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