POWER BLOCK DEVICES FOR DC-DC SYNC BUCK APPLICATIONS HOMEPAGE The IRFH4251D and IRFH4253D are the first of a family of innovative Power Block devices for DC-DC synchronous buck applications including advanced telecom and netcom equipment, servers, graphic cards, desktop, ultrabook and notebook computers. DATASHEETS PRESS RELEASE Advantages The 25V IRFH4251D and IRFH4253D feature IR’s latest generation silicon in a novel package that delivers benchmark power density in a 5x6mm PQFN. The new Power Block devices feature an integrated monolithic FETKY®, and innovative package employing a leading-edge flipped-die technology that enables efficient dissipation of the heat from the source of the synchronous MOSFET directly to the ground layers of the PCB. As a result of improved thermal performance and increased power density, one of the new 5x6 dual devices may replace two 5x6 standard single devices. The new package also utilizes IR’s proprietary single copper clip already employed in PowIRStage® and SupIRBuck® products as well as an optimized layout that significantly reduces stray inductance to lower peak ringing which allows the designer the option of using 25V MOSFETs in place of less efficient 30V devices. HI-RES GRAPHIC Features Control and synchronous MOSFETs in one package Low charge control MOSFET Low RDS(on) synchronous MOSFET Intrinsic Schottky Diode with low forward voltage Scalable platform allows 35A or 45A devices in the same package footprint RoHS Compliant MSL2, Industrial Qualification August 2013