SOURCE: Intersil

August 22, 2006 06:00 ET

Intersil Improves Transient Response and Reduces Output Capacitors

Intersil's "All-in-One VID" Four-Phase PWM Buck Controllers Deliver Industry's Fastest Transient Response and Highest System Accuracy on Intel Core 2 Duo, Intel Core 2 Extreme and AMD AM2 Motherboards

MILPITAS, CA -- (MARKET WIRE) -- August 22, 2006 -- Intersil Corporation (NASDAQ: ISIL), a world leader in the design and manufacture of high-performance power management semiconductors, today introduced a new family of four-phase synchronous PWM (pulse width modulation) buck controllers. These devices achieve the fastest transient response with the fewest output capacitors and provide the industry's most integrated and cost-efficient computing power management solution.

The ISL6312, ISL6312A and ISL6322 provide a complete, integrated precision voltage regulation system for advanced Intel VR10/11(Intel Core 2 Duo and Intel Core 2 Extreme) and AMD AM2 5/6-bit microprocessors. This family features programmable VID (voltage identification) codes for Intel and AMD DAC (digital-to-analog converter) tables.

These devices use Intersil's proprietary active pulse positioning (APP™) and adaptive phase alignment (APA™) modulation schemes to achieve the industry's fastest transient response with the fewest output capacitors over competitive designs. APP and APA are pulse width and positioning modulation techniques that speed up load transient response and reduce the need for external bulk output capacitors required to supply stored energy to the CPU (central processing unit) during abrupt changes in line voltage and load current.

All three devices incorporate a unity gain differential amplifier for remote voltage sensing that compensates for differences between remote and local grounds. The ISL6312/12A/22 also integrate three MOSFET (metal oxide semiconductor field effect transistor) drivers and a PWM output for a fourth external MOSFET driver. This configuration provides the industry's most integrated and cost-efficient power management solution for desktops, workstations, servers, industrial PC motherboards, routers, switches and voltage regulator modules.

"Intersil's new PWM controllers deliver the industry's highest performance/price ratio for three- and four-phase CPU core regulators. Intel VR10/11 and AMD AM2 CPU core solutions using Intersil's advanced controllers meet specs with substantially fewer bulk output capacitors than competitive offerings," said George Lakkas, senior product marketing manager for Intersil's Computing Power products group. "Additionally, Intersil offers family variations for many popular computing applications. For example, the ISL6312A enables customers to monitor the CPU load current in real-time for improved reliability, while the ISL6322 is optimized specifically to work with overclocking applications such as performance motherboards using Intel's Core 2 Extreme processor."

Precision and Integration

The ISL6312, ISL6312A and ISL6322 provide advanced control loop features to optimize transient response to load-apply and removal functions. These include highly accurate and fully differential continuous DCR (DC resistance) current sensing for load line programming and channel current balance. These features also ensure individual channel current and average overcurrent protection (OCP). These devices incorporate key features developed by Intersil specifically for these applications, including active pulse positioning modulation, enabling rapid initial response to high slew rate (di/dt) load transients. The ISL6312/12A/22 also include adaptive phase alignment that enables the fastest possible load transient response with capacitor elimination when there is a severe load turn-on.

The ISL6312A incorporates an added IOUT pin to the basic ISL6312 architecture for output current measurement. The ISL6322 provides an I2C bus input for adjusting four basic regulator functions, such as the output voltage, overvoltage protection (OVP) level, operating frequency per phase, and MOSFET driver adaptive dead time control. This family features sophisticated overvoltage, undervoltage, and overcurrent protection. Additionally, the ISL6312/12A/22 include open circuit protection on the remote sensing inputs.

Key Features

--  Integrated MOSFETs that save cost and board space
--  All-in-one VID for simplified design of Intel and AMD processors
--  Industry's fastest load transient response
--  Adaptive phase alignment for fast load transient response to severe
    load turn-on
--  Active pulse positioning for fast response to high slew rate load
--  Industry's highest system accuracy over life, line, load and
--  Fully differential inductor DCR current sensing for individual channel
    and average overcurrent protection
Target Applications
--  Desktops, workstations, servers
--  Single board motherboards
--  Industrial PC motherboards
--  Routers and switches
--  Voltage regulator modules
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

Pricing and Availability

The ISL6312, ISL6312A, and ISL6322 are available now in space-saving, 48-lead, 7 x 7 QFN packages with prices beginning at $6.67 each and ranging to $7.42 each in 1,000-piece quantities. More information is available at,1477,ISL6312,0.html,,1477,ISL6312A,00.html and,1477,ISL6322,00.html.

A large selection of power products is supported by Intersil's iSim™ online design tool. To explore these solutions, visit To view a broad range of application block diagrams, visit Intersil's Application Design Center at

Note to editors: To view a high-resolution downloadable photo of the ISL6312, ISL6312A and ISL6322, 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

APP, APA and iSim are trademarks 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