INTERNATIONAL Rectifier (IR), represented by Soanar Plus , has introduced the IRU3073 controller IC designed for dual-output, high-performance DC-DC converters.
The device has been 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-side 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.
"The new IRU3073 is ideal for dual-output voltage applications where size is a major factor, such as graphics cards and motherboards," said Stephen Tsang, senior vice president of sales at IR. "The LDO controller allows the designer flexibility in addressing various power configurations."