MOSFETs are tough enough for handheld supplies

Five new N-channel 40V MOSFETs for DC/DC conversion offer excellent price and efficiency benefits in power supply designs for laptops and other portable/handheld applications.

Five new N-channel 40V mosfets for DC/DC conversion offer excellent price and efficiency benefits in power supply designs for laptop, computer VRM, telecomms, datacomms/router and other portable/handheld applications.

At a maximum of 7.5mohm the FDS4770 has an extremely low on-resistance rating for a 40V, SO-8 packaged device, and has a 175C maximum junction temperature allowing a higher current rating than previously available.

The 40V mosfets offer extended avalanche energy capability for rugged operation - a reliability advantage in applications with high transient voltage activity or operating modes where mosfets are subjected to increased stress.

Depending on the input and output voltages demanded by a particular application, these 40V mosfets can be used as synchronous rectifiers or as primary or high-side switches in isolated and nonisolated power supply designs.

All five products offer optimum performance and cost tradeoffs in low-voltage power applications requiring high efficiencies and power densities.

The low gate charge of the FDS4470 makes it very efficient at high frequencies, placing less stress on driver circuitry.

The FDS4480 offers an alternative tradeoff between on-resistance and gate charge, and is very price competitive.

The FDS4672A also offers a lower threshold voltage for low gate drive applications.

The FDS4780 is a lower on-resistance version of the FDS4480 with the same gate charge for the best on-resistance/gate-charge figure of merit.

These products are complementary with Fairchild's solutions for DC/DC conversion as optically isolated amplifiers (FOD27XX), fast recovery diodes, and PWM controllers.

Samples and production quantities are available now.

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