SOURCE: Intersil

January 29, 2007 06:00 ET

Intersil's PWM Controller Increases Efficiency and Saves Space

Intersil's ISL6535 Features Excellent Output Voltage Regulation, Integrated 3A MOSFET Gate Drivers and Near-Chipscale Footprint With Small 4mm x 4mm QFN Package

MILPITAS, CA -- (MARKET WIRE) -- January 29, 2007 -- Intersil Corporation (NASDAQ: ISIL), a world leader in the design and manufacture of high-performance analog semiconductors, today introduced the ISL6535 high-performance PWM (pulse width modulation) controller. This device integrates the control, gate drivers, output adjustment, monitoring and protection functions into a near-chipscale-sized 4mm x 4mm 16-lead QFN package.

Intersil's ISL6535 integrates 12V, high-speed, 3A MOSFET gate drivers for excellent gate drive capability and improved efficiency with less expensive MOSFETs. Also, the converter can source and sink current, which is ideal for DDR (double data rate) memory applications.

"The ISL6535 error amplifier features 15MHz gain bandwidth and a 6V/us slew rate that enables high converter bandwidth for fast transient performance," said Philip Chesley, marketing manager of Intersil's Desktop Power products group. "The overcurrent protection monitors the current by using the rDS(ON) of the upper MOSFET, eliminating the need for a current sensing resistor and reducing the overall BOM cost."

Efficient Output Voltage Regulation and Fast Transient Response

The ISL6535 provides a simple, single feedback loop and voltage mode control architecture. It includes programmable switching frequency that is adjustable from below 50kHz to over 1.5MHz.

The output voltage of the converter can be precisely regulated to as low as 0.597V, with a maximum tolerance of +/-1% over the commercial temperature range, and +/-1.5% over the industrial temperature range. Full (0% to 100%) PWM duty cycle support and pre-biased soft-start features are also provided.

Key Features

--  Operates from +12V input
--  Excellent output voltage regulation
--  0.597V internal reference
--  +/-1% over the commercial temperature range
--  +/-1.5% over the industrial temperature range
--  Simple single-loop control design
--  Voltage-mode PWM control
--  Fast transient response
--  High-bandwidth error amplifier
--  Full 0% to 100% duty ratio
--  Leading and falling edge modulation
--  Small converter size
--  Constant frequency operation
--  Oscillator programmable from 50kHz to over 1.5MHz
--  12V high-speed MOSFET gate drivers
--  2.0A source/3A sink at 12V low-side gate drive
--  1.25A source/2A sink at 12V high-side gate drive
--  Drives two N-channel MOSFETs
--  Overcurrent fault monitor
--  High-side MOSFET's rDS(ON) sensing
--  Reduced ~120ns blanking time
--  Converter can source and sink current
--  Soft-start done and an external reference pin for tracking
    applications are available in the QFN package
--  Pin-compatible with ISL6522
--  Supports startup into pre-biased loads
--  Pb-free plus anneal available (RoHS compliant)
Target Applications
--  Power supply for some Pentium®, PowerPC™ and graphic CPUs
--  High-power 12V-input DC/DC regulators
--  Low-voltage distributed power supplies
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 ISL6535 is available now in a 16-lead QFN package, with prices starting at $1.52 each and in a 14-lead SOIC package with prices starting at $1.39 each in 1,000-unit quantities. For more information on the ISL6535, visit,1477,ISL6535,0.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 ISL6535, 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, 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

iSim is a 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