New Industry Products

30V Dual FETKY, the IRF7901D1

December 26, 1999 by Jeff Shepard

International Rectifier (IR, El Segundo, CA) recently announced its 30V Dual FETKY, the IRF7901D1. The device is designed to integrate all the power semiconductors for a synchronous buck dc/dc converter in a single SO-8 package. According to IR, the device allows designers to reduce the footprint of dc/dc converter solutions by more than 60 percent for laptops and other multi-converter battery powered systems. The converters are designed to provide outputs of up to 5A peak at 5.0, 3.3 and 1.8V with up to 96 percent efficiency. IR claims that when using these Dual FETKY devices in the peripheral dc/dc applications for notebook PCs, a peak efficiency of over 94 percent for the 3.3Vout and over 96 percent for the 5.0Vout can be achieved. The IRF7901D1 is designed to provide Rds(on) at 28.5 milliohms (typical) at Vgs=4.5V and Qswitch=2.3nC (typical) for the control FET, and Rds(on) at 22 milliohms (typical) at Vgs=4.5V for the synchronous FET with low Vf of 0.48V at 1A for the Schottky. The new Dual FETKY, an extension of IR's successful FETKY product line, takes component integration to the next level, said Carl Smith, product marketing engineer for the Processor Power Group at IR. Our new Dual FETKY was optimized for low voltage synchronous buck dc/dc applications, and includes a planar control FET and trench synchronous FET with a parallel metal barrier Schottky diode to deliver outstanding performance. Internal connections have been configured to minimize external PCB traces to reduce the stray inductances and to improve circuit layout design. This essentially 'componentizes' a Buck dc/dc converter, providing lower component count and reduced footprint, while achieving very good efficiency.