ISL65426: 6A Dual Synchronous Buck Regulator with Integrated MOSFETs

The ISL65426 is a high efficiency dual output monolithic synchronous buck converter operating over an input voltage range of 3V to 5.5V. This single chip power solution provides two output voltages, which are selectable or externally adjustable from 1V to 80% of the supply voltage while delivering up to 6A of total output current. The two PWMs are synchronized 180° out-of-phase, reducing the RMS input current and ripple voltage.

The ISL65426 switches at a fixed frequency of 1MHz and utilizes current-mode control with integrated compensation to minimize the size and number of external components and provide excellent transient response. The internal synchronous power switches are optimized for good thermal performance and high efficiency.

A unique power block architecture allows partitioning of six 1A blocks to support one of four configuration options. One master power block is associated with each synchronous converter channel. Four floating slave power blocks allow the user to assign them to either channel. Proper external configuration of the power blocks is verified internally prior to soft-start initialization.

Independent enable inputs allow for synchronization or sequencing soft-start intervals of the two converter channels. A third enable input allows additional sequencing for multi-input bias supply designs. Individual power-good indicators (PG1, PG2) signal when output voltage is within the regulation window.

The ISL65426 integrates protection for both synchronous buck regulator channels. The fault conditions include overcurrent, undervoltage, and IC thermal monitor.

High integration contained in a thin Quad Flat No-lead (QFN) package makes the ISL65426 an ideal choice to power many of today's small form factor applications. A single chip solution for large scale digital ICs, like field programmable gate arrays (FPGA), requiring separate core and I/O voltages.

Key Features
  • High Efficiency: Up to 95%
  • Fixed Frequency: 1MHz
  • Operates From 3V to 5.5V Supply
  • ±1% Reference
  • Flexible Output Voltage Options
    • Programmable 2-Bit VID Input
    • Adjustable Output From 1V to 4.0V
  • User-Partitioned Power Blocks
  • Ultra-Compact DC/DC Converter Design
  • PWMs Synchronized 180° Out-of-Phase
  • Independent Enable Inputs and System Enable
  • Stable All Ceramic Solutions
  • Excellent Dynamic Response
  • Independent Output Digital Soft-Start
  • Power-Good Output Voltage Monitor
  • Thermal-Overload Protection
  • Overcurrent and Undervoltage Protection
  • Pb-Free (RoHS Compliant)
Applications
  • FPGA, CPLD, DSP, and CPU Core and I/O Voltages
    • Xilinx Spartan III™, Virtex II™, Virtex II Pro™, Virtex 4™
    • Altera Stratix™, Stratix II™, Cyclone™, Cyclone II™
    • Actel Fusion™, LatticeSC™, LatticeEC™
  • Low-Voltage, High-Density Distributed Power Systems
  • Point-of-Load Regulation
  • Distributed Power Systems
  • Set-Top Boxes
Typical Diagram
Application Notes
TitleTypeUpdatedSizeOther Languages
AN1209: Intersil Integrated FET DC/DC Converters in ChinesePDF02 Dec 20141.24 MB
AN9208: High Frequency Power ConvertersPDF13 Nov 201478 KB
AN9210: A New PSpice Subcircuit for the Power MOSFET Featuring Global Temperature OptionsPDF13 Nov 2014190 KB
AN9209: A Spice-2 Subcircuit Representation for Power MOSFETs Using Empirical MethodsPDF13 Nov 201456 KB
AN7244: Understanding Power MOSFETsPDF13 Nov 201441 KB
User Guides
TitleTypeUpdatedSizeOther Languages
ISL65426EVAL1Z User GuidePDF13 Nov 2014400 KB
White Papers
TitleTypeUpdatedSizeOther Languages
Five Easy Steps to Create a Multi-Load Power SolutionPDF30 Jan 2017502 KB
Order Information
Part NumberPackage TypeWeight(g)PinsMSL RatingPeak Temp (°C)RoHS Status
ISL65426HRZ50 Ld QFN0.1955503260RoHS
ISL65426HRZ-T50 Ld QFN T+R0.1955503260RoHS
ISL65426IRZA50 Ld QFN0.1955503260RoHS
ISL65426IRZA-T50 Ld QFN T+R0.1955503260RoHS
ISL65426EVAL1ZN/ARoHS
ISL65426 Datasheet 17 Nov 2014
50 Ld QFN T+R ISL65426
ISL65426
AN1209: Intersil Integrated FET DC/DC Converters in Chinese 02 Dec 2014
AN9208: High Frequency Power Converters 13 Nov 2014
AN9210: A New PSpice Subcircuit for the Power MOSFET Featuring Global Temperature Options 13 Nov 2014
AN9209: A Spice-2 Subcircuit Representation for Power MOSFETs Using Empirical Methods 13 Nov 2014
AN7244: Understanding Power MOSFETs 13 Nov 2014
ISL65426EVAL1Z User Guide 13 Nov 2014
Five Easy Steps to Create a Multi-Load Power Solution 30 Jan 2017