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. The ISL8018 is offered in a space saving 20 Ld 3x4 QFN lead free package with exposed pad lead frames for excellent thermal performance. The complete converter occupies less than 96. 8mm2 area.


  • High efficiency synchronous buck regulator with up to 97% efficiency
  • ±10% output voltage margining
  • Adjustable current limit
  • Start-up with prebiased output
  • Internal soft-start - 1ms or adjustable, internal/external compensation
  • Soft-stop output discharge during disabled
  • Adjustable frequency from 500kHz to 4MHz - default at 1MHz
  • External synchronization up to 4MHz - master to slave phase shifting capability
  • Peak current limiting, hiccup mode short-circuit protection and over-temperature protection

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active QFN Tube 75
Active QFN Reel 6000
Active QFN Reel 250


Title language Type Format File Size Date
Datasheets & Errata
ISL8018 Datasheet Datasheet PDF 1.27 MB
Application Notes & White Papers
AN9208: High Frequency Power Converters Application Note PDF 592 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
AN9210: A New Pspice Subcircuit For The Power MOSFET Featuring Global Temperature Options Application Note PDF 650 KB
AN9209: A Spice-2 Subcircuit Representation For Power MOSFETs Using Empirical Methods Application Note PDF 387 KB
AN7244: Understanding Power MOSFETs Application Note PDF 349 KB
How to Improve DC/DC Converter Performance with Phase Shifting Time Delay White Paper PDF 531 KB
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
ISL8018DEMO1Z Design Files Design File ZIP 277 KB
ISL8018EVAL3Z Design Files Design File ZIP 914 KB
ISL8018DEMO1Z User Guide Manual PDF 512 KB
ISL8018EVAL3Z User Guide Manual PDF 1004 KB
ISL8018 iSim:PE Model Schematic SXSCH 287 KB

Software & Tool Pages

Title Type Description Company
iSim:PE Offline Simulation Tool Simulator iSim Personal Edition (iSim:PE) speeds the design cycle and reduces risk early in any project, identifying parts that can be used in current as well as next-generation designs. Renesas

Boards & Kits

Part Number Title Type Company
ISL8018DEMO1Z 8A Low Quiescent Current High-Efficiency Synchronous Buck Regulator Demonstration Board Demonstration Renesas
ISL8018EVAL3Z 8A Low Quiescent Current High-Efficiency Synchronous Buck Regulator Evaluation Board Evaluation Renesas