IR Chip Set Delivers Higher Efficiency in Two-Phase DC-DC Buck Converters
International Rectifier has introduced a pair of 30V HEXFET® power MOSFETs that deliver up to 2% higher light-load efficiency over solutions using 30V MOSFETs in 45A, two-phase synchronous buck converters powering the latest Intel and AMD processors for notebook and other high-performance computing applications.
These new lead-free devices, the IRF7823PbF and IRF7832ZPbF, maximize efficiency and power density by optimizing conduction, switching and body diode losses. The two devices are designed to be used as a chip set in two-phase synchronous buck converter circuits requiring one control and two synchronous MOSFETs per phase. The new SO-8 MOSFETs are also suitable for other pulse width modulator-controlled dc-dc buck converter applications.
"High efficiency, under low and intermediate power levels, is important in notebook applications since this is where most of the battery power is consumed. In this setting, our new chip set can deliver up to 2% higher efficiency in the 5 amp to 15 amp range,"said Jeff Sherman, senior marketing manager for the company's Computing Solutions division. "The lower power losses achieved by these new devices also contribute to systems that run cooler, another very important aspect for portable computing."
The chip set consists of a control MOSFET and a synchronous MOSFET, with each device tailored to maximize performance in their role. Control MOSFETs have reduced switching losses (gate charge), while synchronous MOSFETs have low conduction losses (low on-resistance), and low reverse-recovery charge.
The IRF7823PbF is an optimized control FET, with very low gate charge and gate-to-drain charge of only 9.1nC and 3.2nC, respectively.
The IRF7832ZPbF has been optimized for the synchronous FET function, with extremely low typical 4.5V on-resistance of 3.7mOhm, and is suitable up to 12A.
The IRF7823PbF and the IRF7832ZPbF are available immediately.
Pricing is $0.50 each for the IRF7823PbF, while the IRF7832ZPbF is $0.88 each in 10,000-unit quantities. Prices are subject to change.
The devices are compliant with the Restriction of Hazardous Substances Directive (RoHS).
