October 7, 2003 - International Rectifier, IR® introduces the IRU3073 controller IC designed for dual output high performance DC-DC converters. 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, desktop and server motherboards.
The integrated low dropout (LDO) controller enables a second output voltage using a single external MOSFET rather than a second circuit, such as another LDO controller. The IRU3073 operates with single supply 5V or 12V input voltage applications. Both low- and high-side drivers can be biased separately, eliminating external components for charge pump circuitry for 5V applications when a 12V bias voltage is available.
The IRU3073 is a synchronous PWM controller with programmable switching frequency from 200kHz to 400kHz, capacitor-programmable soft-start, an uncommitted error amplifier for DDR voltage tracking applications and a 0.8V precision voltage reference for converters with low output voltages.
The IRU3073 monitors the synchronous MOSFET on-resistance for over-current protection, enhancing converter efficiency and reducing cost by eliminating the current sense resistor.
Availability and Pricing
The new IRU3073 controller IC is packaged in the 16-pin QSOP package, and is available immediately. Pricing is US$0.70 each in 1,000-unit quantities.
