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Integrated driver-MOSFET touts 96.5% efficiency

Posted: 15 Jan 2009 ?? ?Print Version ?Bookmark and Share

Keywords:MOSFET PC server? power efficiency supply? integrated MOSFET driver?

R2J20651NP integrated driver-MOSFET

Renesas Technology Europe announced the R2J20651NP integrated driver-MOSFET. Available in a 40-pin QFN 6mm x 6mm package, the device is designed for use in the CPU and DDR type SDRAM power supplies used in PCs and servers, and achieves what is believed to be the industry's highest power supply efficiency of 96.5% at Vin = 5V, Vout = 1.8V.

The R2J20651NP conforms to the integrated driver-MOSFET (DrMOS)*2 specifications, rev 3.0 of Intel Corp., which stipulate a 6mm x 6mm package size. It incorporates two high-side/low-side MOSFETs and a driver circuit in a single package.

Space savings
The device achieves the high power supply efficiency by using Renesas' most recent tenth-generation power MOSFETs that have improvements in efficiency and lower loss. In addition, use of the product can lead to space savings in end product designs since a reduced heat generation allows a smaller heat sink to be used. Also, the number of capacitors and other passive components can be reduced.

The device offers a high thermal dissipation/low-loss package technology. Compared with the earlier Renesas 8mm x 8mm package size, the R2J20651NP reduces the mounting area by about one half. Furthermore, since it can handle up to 35A, it can easily be implemented in high-density DC/DC converters.

The R2J20651NP includesfor the first time in a DrMOS standard producta temperature detection function that can output a signal of over-temperature when the driver IC temperature exceeds 130C. This signal can be used according to the needs of the application, for example, by having the system power supply control IC receive this signal and shut down the system. Furthermore, safer power supply systems can be implemented, since abnormal modes and overload states can be detected in advance by having the power device monitor its own temperature and heat generation.

The device also supports a discontinuous operating mode in which the low-side MOSFET is forcibly turned off by internal logic using the LSDBL# connected to the driver IC. This function is effective both at preventing rapid discharge or load side voltage spikes during pre-bias operation when there is already a voltage remaining on the outputs at startup and at increasing efficiency during light-load operation.

Typical applications include CPU voltage regulators and DDR type SDRAM DC/DC converters used in servers and PCs; DC/DC converters for FPGAs and high-performance DSPs; and DC/DC converters for digital appliances, games and other consumer electronic products.

- Henri Arnold
EE Times-Europe

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