SOURCE: Intersil

November 14, 2006 06:00 ET

Intersil's Dual Synchronous Buck Regulator Features Integrated MOSFETs and High Efficiency User-Configurable Power Blocks

Intersil's ISL65426 Provides Two Logic-Programmable or Resistor-Adjustable Output Voltages and Added Flexibility of User-Programmable Load Currents for Each Output (With 6A Total Output Current From Both Outputs)

MUNICH, GERMANY -- (MARKET WIRE) -- November 14, 2006 -- ELECTRONICA -- Intersil Corporation (NASDAQ: ISIL), a world leader in the design and manufacture of high-performance analog semiconductors, today introduced the ISL65426, a high-efficiency dual output synchronous buck regulator. This device integrates protection for two synchronous buck regulator channels in a thin QFN package, making it ideal for powering today's small form factor applications.

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.

"Intersil's ISL65426 facilitates a quick power supply design through its unique architecture of six 1A user-configurable power blocks," said Sarika Arora, marketing manager for Intersil's Industrial and Communications Power products group. "With its ease of configurability, high integration and advanced monitoring and protection features, the ISL65426 represents a complete and compact power solution."

Integration and Efficiency

The ISL65426 is a high-efficiency dual output monolithic synchronous buck converter operating over an input voltage range of 2.375V 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 (pulse width modulators) are synchronized 180° out of phase, reducing EMI and the RMS (root means square) input current and ripple voltage thus reducing the size of input filter components.

The ISL65426's unique power block architecture allows partitioning of six 1A capable blocks to support one of four output configuration options (5A:1A; 4A:2A; 3A:3A; 2A:4A). 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 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 regulation window.

The ISL65426 integrates protection for both synchronous buck regulator channels. The fault conditions include overcurrent, undervoltage, and IC thermal monitor. A thermally enhanced QFN package, the high 1MHz switching frequency and reduced BOM component count results in a compact power supply solution for the VCCINT and VCCIO supply rails of an FPGA or CPLD.

Key Features

-- High efficiency: up to 95%
-- Fixed frequency: 1MHz
-- Operates from 2.375V to 5.5V supply
-- +/-1% system accuracy over temperature
-- Flexible output voltage options
    -- Programmable 2-bit VID input
    -- Adjustable output from 1.0V to 4.0V
-- User-partitioned six 1A power blocks
-- Ultra-compact DC/DC converter design
-- PWMs synchronized 180° out of phase
-- Independent enable inputs and system enable
-- Stable with ceramic capacitors
-- Excellent dynamic response
-- Independent output digital soft-start
-- Power good output voltage monitor
-- Short-circuit and thermal-overload protection
-- Overcurrent and undervoltage protection
-- Pb-free plus anneal available (RoHS compliant)
Target 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, Routers, Switchers
About Intersil's Power Management Portfolio

Intersil's high-performance analog ICs provide innovative power management solutions for applications in the computing, communications, peripherals, display, networking, telecommunications, industrial, instrumentation and battery-powered products markets. Intersil is a leading supplier of PWM controller ICs with over two billion units shipped. Intersil offers a broad portfolio of power management ICs, including single and multiple output switching regulators, integrated FET DC/DC controllers, battery management ICs, hot plug controllers and power MOSFET drivers. To learn more, visit Intersil's Power Management page at

Analog Technology on Display at Electronica

Intersil will display its complete portfolio of high-performance analog products that address the industry's fastest-growing markets at Electronica 2006 from November 14-17, 2006 in Hall A4, Booth 207 at the New Trade Fair Centre in Munich, Germany. For more information, visit,1246,132,00.html.

Pricing and Availability

The ISL65426 is available now in a 50-lead QFN package and is priced at $4.17 in 1,000-unit quantities. For more information on the ISL65426, visit,1477,ISL65426,0.html. A large selection of power products is supported by Intersil's iSim™ online design tool. To explore these solutions, visit

Note to editors: To view a high-resolution downloadable photo of the ISL65426, visit Intersil's photo room at:

About Intersil

Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products address some of the industry's fastest growing markets such as flat panel displays, cell phones, handheld products and notebook computing. Intersil's product families address both power management and analog signal processing functions. Intersil products include ICs for battery management; hot-swap and hot-plug controllers; linear regulators; supervisory ICs; switching DC/DC regulators; power MOSFET drivers; optical storage laser diode drivers; DSL line drivers; video and high-performance operational amplifiers; data converters; interface ICs; analog switches and multiplexers; crosspoint switches; voice-over-IP devices; and ICs for military, space and radiation-hardened applications. For more information about Intersil or to find out how to become a member of our winning team, visit the Company's web site and career page at

iSim is trademark of Intersil Americas, Inc. All other brands or product names are trademarks or registered trademarks of their respective holders.

Contact Information

  • Media Contact
    Kim Fehrt
    Public Relations Manager
    Intersil Corporation
    (408) 546-3566
    Email Contact