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Half-bridge MOSFET driver handles up to 28V

Posted: 18 Dec 2008 ?? ?Print Version ?Bookmark and Share

Keywords:MOSFET driver? DC/DC converter? low impedance?


Advanced Analogic Technologies Inc. (AnalogicTech) has released the AAT4910, a half-bridge, dual MOSFET driver supporting up to 28V, and claimed to offer the lowest impedance in its class for multiphase DC/DC converters.

The AAT4910 dual MOSFET driver takes a logic input and drives both high and low-side n-channel MOSFETs. The high side external MOSFET is turned on when the logic input is driven high and the low-side MOSFET is turned on when the logic input is driven low. Powered from a 5V rail, the device features circuitry capable of driving the high-side n-channel MOSFET with up to 28V power input. When driven low, the enable input turns off the driver and reduces operating current to Break-before-make shoot-through protection prohibits high-side and low-side MOSFETs on the AAT4910 from conducting current at the same time, and significantly reduces losses associated with the driver at high frequencies.

In addition, to protect the device from a short circuit or defective MOSFET, the AAT4910 also features overtemperature protection which turns off the device when die temperature exceeds 140C.

"Today's multiphase DC/DC converter and motor control circuit designers need low cost drivers capable of supporting higher voltages," said CJ Zhang, product line VP at AnalogicTech. "By operating at up to 28V and combining a high switching frequency with a compact SC70JW package, the AAT4910 meets that need. Moreover, with an extremely low 3 drive resistance, this new device allows them to drive larger MOSFETs faster in these applications."

The AAT4910 is qualified across the -40C to +85C temperature range. It is available in a 2mm x 2.1mm, 8-lead SC70JW package. It sells for $0.48 in 1,000 quantities.

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