SOURCE: Intersil

October 09, 2008 11:39 ET

World's Highest Light Load Efficiency MOSFET Gate Drivers Save Cost and Board Space in Multiphase Switching Regulator Designs for Intel® VR11.1 CPUs

ISL6622, ISL6622A Provide Diode Emulation, Gate Voltage Optimization for Best-in-Class Light Load Performance in Server, Desktop, Gaming Applications

MILPITAS, CA--(Marketwire - October 9, 2008) - Intersil Corporation (NASDAQ: ISIL), a world leader in the design and manufacture of high-performance analog semiconductors, today announced a new series of 12V to 5V synchronous rectified buck MOSFET drivers that provide the industry's best light load efficiency for Intel VR11.1 systems.

The ISL6622, ISL6622A, and ISL6622B provide 3A sinking capacity and feature rapid rise/fall times that support up to 1MHz frequency switching. This delivers very high overall efficiency.

Combined with Intersil's VR11.1 PWM controllers and with N-Channel MOSFETs, the ISL6622's advanced PWM protocol supplies a complete core-voltage regulator solution for advanced microprocessors.

The ISL6622 enables diode emulation operation during PSI mode for enhanced light load efficiency and allows Discontinuous Conduction Mode (DCM) by detecting when the inductor current reaches zero. When "zero" is detected, the low side MOSFET is turned off to prevent sinking current and eliminating the power loss associated with the reverse currents. Intersil's gate voltage optimization technology (GVOT) is also active during PSI mode; by reducing the gate drive voltage, switching losses, which dominate total power loss at light loads, are significantly reduced. This adds to the overall efficiency the ISL6622 provides.

These PWM controllers also include adaptive shoot-through protection to prevent both the upper and lower MOSFETs from conducting simultaneously. In addition, they integrate a 20k ohms high-side gate-to-source resistor to prevent self turn-on due to high input bus differential voltage.

Overvoltage protection can be operational while VCC is below the POR threshold: the PHASE node is connected to the gate of the low side MOSFET (LGATE) via a 10k ohms resistor, so the output voltage of the converter is maintained close to the gate threshold of the low side MOSFET. This capability protects the load in case the upper MOSFET(s) become shorted.

The drivers come in two package types with different drive voltages. In the 8-lead SOIC package, the ISL6622 drives the upper and lower gates to VCC during normal PWM mode; the lower gate drops to a fixed typical 5.75V in PSI mode. In the 10-Lead DFN ISL6222A, the upper gate can be driven from 5V to 12V via the UVCC pin; the lower gate has a resistor-selectable drive voltage of typical 5.75V, 6.75V, and 7.75V in PSI mode.

These drivers are designed for a wide range of server, workstation, desktop and gaming motherboard applications built around Intel processors. They also are an ideal design choice for VRM applications.

Pricing and Availability

The ISL6622/A/ B are available now in 8-lead SOIC packages, priced at $1.00 each in 1,000 unit quantities, and in 10-lead DFN packages priced at $1.07 each in 1,000-unit quantities.

For more information on the ISL6622 go to,1477,ISL6622,0.html

For more information on the ISL6622A go to,1477,ISL6622A,0.html

Note to editors: To view a high-resolution downloadable photo of the ISL6622 and ISL6622A, visit Intersil's photo room at:

About Intersil's Power Management Portfolio

Intersil is a recognized global leader in power management solutions, offering a broad portfolio of products that simplify a variety of power designs. Intersil's family of power management ICs ranges from building blocks such as charge pumps, to highly-integrated, multiple-output and multiphase PWMs, to quad-voltage hot-swap controllers. As a leading supplier of PWM controller ICs with over two billion units shipped, Intersil addresses a broad range of power management needs for applications that include computing, communications, peripherals, display, networking, telecommunications, industrial, instrumentation and battery-powered products. To learn more, visit Intersil's Power Management Web site 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, other handheld systems, and notebooks. Intersil's product families address power management functions and analog signal processing functions. Intersil products include ICs for battery management, hot-swap and hot-plug controllers, linear regulators, power sequencers, supervisory ICs, bridge drivers, PWM controllers, switching DC/DC regulators and 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

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