EL SEGUNDO, Calif. July 2003 - International Rectifier, IRŪ, (NYSE: IRF) today introduces the IRU3039 pulse width modulated (PWM) control IC with built-in, loss-less current sensing and over-current protection that simplifies circuits and maximizes efficiency, since external sense resistors are not needed.

This versatile device is designed for a wide range of compact, high performance synchronous buck regulator applications used in DDR memory circuits, computer graphics cards, hard disk drives, network computer and server power supplies and on-board DC-to-DC converters. In DDR memory circuits, the new IRU3039 can be used to provide both the core voltage (VDDQ) and termination voltage (VTT).

Over-current protection is achieved by monitoring the synchronous MOSFET on-resistance, enhancing converter efficiency and reduces cost by eliminating the current sense resistor. The on-board regulator cuts component count. The single output voltage can be programmed as low as 0.8V for low voltage applications.

Reza Amirani, Director of Applications for DC-DC Power Management ICs at International Rectifier said, "The new IRU3039 eliminates external current sensing with a loss-less current sense mechanism using the synchronous MOSFET. In addition, the internal linear regulator enables a compact and flexible solution for single supply up to 18V applications."

The IRU3039 features programmable switching frequency up to 400kHz, which can shrink circuit size with smaller inductors and output capacitors. Other features include a capacitor-programmable soft-start function, an uncommitted error amplifier available for DDR voltage tracking applications and a 0.8V precision reference voltage with 2% output voltage accuracy over the entire operating temperature range.

The IRU3039 is packaged in 20 pin MLPQ, allowing for both small size while providing a good thermal characteristics for high frequency as well as high input supply applications.

Availability and Pricing

The new IRU3039CH PWM control IC in the 20-pin MLPQ package is available immediately. Pricing begins at US $1.00 each in 10,000-unit quantities.

High Resolution JPEGs are available in the Press Room.