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Intersil ISL8018

Intersil ISL8018 - 8A Low Quiescent Current High Efficiency Synchronous Buck Regulator

The ISL8018 is a high efficiency, monolithic, synchronous step-down DC/DC converter that can deliver up to 8A continuous output current from a 2.7V to 5.5V input supply. The output voltage is adjustable from 0.6V to VIN. With an adjustable current limit, reverse current protection, prebias start and over-temperature protection, the ISL8018 offers a highly robust power solution. It uses current control architecture to deliver fast transient response and excellent loop stability.

The ISL8018 integrates a pair of low ON-resistance P-channel and N-channel internal MOSFETs to maximize efficiency and minimize external component count. 100% duty-cycle operation allows less than 250mV dropout at 8A output current. 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 load. Forced continuous operation reduces noise and RF interference while discontinuous mode provides high efficiency by reducing switching losses at light loads.

Features

  • Delivers high peak efficiency up to 97% in a compact 0.15 inch2 footprint
  • +/-10% output voltage margining
  • Output voltage is adjustable from 0.6V to Vin, with a fixed output voltage option
  • Adjustable current limit
  • External synchronization up to 4MHz, with master-to-slave phase shifting capability
  • Provides 1% reference accuracy over temperature, load and line
  • Adjustable switching frequency from 500kHz to 2MHz, with default at 1MHz
  • Start-up with pre-bias output, internal soft-start -- 1ms or adjustable, internal/external compensation
  • Soft-stop output discharge during disabled
  • Peak current limiting, hiccup mode short circuit protection and over-temperature protection

Applications

  • DC/DC POL modules
  • µC/µP, FPGA and DSP power
  • Plug-in DC/DC modules for routers and switchers
  • Portable instruments
  • Test and measurement systems
  • Li-ion battery powered devices