Intersil : Digital hybrid PWM controllers with PMBus simplify power-supply design


Intersil power controllers: no need for external compensation devices

Intersil has introduced two new PMBus™- compatible, single-phase digital hybrid DC-DC controllers which support Pointof-Load (PoL) power conversion for FPGAs, DSPs, ASICs, processors and general-purpose system rails.

The ISL68200 can drive external MOSFETs directly, while the ISL68201 with PWM output features Intersil’s DrMOS (Integrated Driver and MOSFET) power stage to create a complete voltage-regulator solution.

Both controllers are fully configurable with external pin-strap resistors. This results in a design flow which closely matches that of traditional analogue controllers, while still offering the flexibility and feature set of a digital interface. Designers can use the PMBus interface and Intersil’s PowerNavigator™ GUI software to read back measurements of the input voltage, output voltage, output current and temperature, to monitor fault reporting bits, and to perform on-the-fly changes to the output-voltage set point.

For systems in which PMBus functionality is not required, the interface can be used to debug the power supply during board bring-up, and then left disconnected in final production. This feature speeds development by allowing designers to quickly modify important parameters such as switching frequency, output voltage and loop gain to fine-tune power supply performance without using a soldering iron to
change components.

The ISL68200 and ISL68201 benefit from Intersil’s proprietary R4™ modulation technology. This provides a compensation-free control loop which eliminates the need for external compensation resistors and capacitors. The R4 modulator includes energy-saving light load efficiency modes of operation, and has excellent transient performance, adjusting both duty cycle and switching frequency in response to load transients.


  • Input-voltage range: 4.5V to 24V
  • Output-voltage range: 0.5V to 5.5V
  • Eight switching frequency options from
    300kHz to 1.5MHz
  • Power-good monitor for soft-start and
    fault detection
  • Precision Enable input for power


  • FPGA, ASIC and memory power supplies
  • Point-of-load digital power
  • Servers and storage systems
  • Telecoms and network equipment
  • Wireless basestations



WorkingPartner_StarProductVishay: IHLP-3232DZ-8A

This six-layer board demonstrates a 17mm x 17mm 35A synchronous buck converter, based on the ISL68201 buck controller and the ISL99140 high-performance DrMOS power stage, which integrates a gate driver and MOSFETs.

Orderable Part Number: ISL68201-99140DEMO1Z