Intersil – 8A Step Down Regulator Achieves Up to 97% Efficiency


The ISL8018 from Intersil is a synchronous step down DC-DC converter IC which can supply up to 8A continuous output current from a 2.7V to 5.5V input supply.

The output voltage of the ISL8018 is adjustable in a range from 0.6V up to the value of the input voltage. It uses a current-control architecture to provide a fast response to transient events and excellent loop stability.

The ISL8018 integrates a pair of P- and N-channel MOSFETs, helping to minimize the external component count. With a dropout of less than 250mV at an output current of 8A, the regulator achieves very high efficiency of up to 97%. In addition, adjustable frequency and synchronization allow the ISL8018 to be used in applications requiring low noise.

The ISL8018 can be configured for discontinuous or forced continuous operation at light-loads. Forced continuous operation reduces noise and RF interference, while discontinuous mode provides high efficiency by reducing switching losses at light-loads.

The ISL8018 is supplied in a 3 x 4mm QFN package with exposed-pad lead frames for excellent thermal performance.


  • ±10% output voltage margining
  • Adjustable current limit
  • Start-up with pre-biased output
  • Internal soft start
  • Frequency adjustable between 500kHz and 4MHz
  • Short circuit protection
  • Over-temperature protection


  • Point-of-load modules
  • Power supplies for microcontrollers, microprocessors, FPGAs and DSPs
  • DC-DC converter modules for routers and switchers
  • Portable instruments
  • Test and measurement systems
  • Devices powered by a lithium-ion battery

Evaluation Board

Part Supported: ISL8018
Board Part Number: ISL8018EVAL3Z
Description: The ISL8018EVAL3Z evaluation board is intended for use in point-of-load applications sourcing between 2.7V and 5.5V. The complete converter circuit occupies an area of 439mm2.