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4A MOSFET driver touts 'highest' efficiency

Posted: 21 Jul 2006 ?? ?Print Version ?Bookmark and Share

Keywords:TI? TPS28225? MOSFET driver?

Calling its 4A MOSFET driver the industry's highest efficiency device for 7-8V, 40A-per-phase power systems, Texas Instruments said its TPS28225 synchronous driver, for n-channel complementary driven MOSFETs, is suited for VRMs, notebook computers, isolated power supplies with secondary side synchronous rectifiers, and DC/DC converters.

"Power system designers continue to require higher operating efficiency and performance when using standard 5- and 12-volt drivers," said Larry Spaziani, product line manager for the Power Supply Control business. "Several top power customers using the TPS28225 achieve a three- to eight-percent improvement in power efficiency, while increasing their switching frequency, decreasing their module size and significantly improving transient response."

The 2MHz device features 14ns adaptive dead-time control, 14ns propagation delay, and high-current 2A source and 4A sink drive capability. The driver's 0.4-ohm impedance for the lower gate driver holds the gate of the (external) power MOSFET below its threshold level to ensure no shoot-through current occurs during high dV/dT phase node transitions. A bootstrap capacitor charged by an internal diode allows the device to use n-channel MOSFETs in a half-bridge configuration.

The TPS28225 features a three-state pulse-width modulation (PWM) input, which is compatible with all multi-phase controllers that employ a three-state output feature. The shutdown mode feature prevents a load from the reversed output voltage.

The TPS28225 MOSFET driver, available in 8-pin, SOIC and thermally enhanced 3-by-3mm DFN packages, has a suggested retail price of 60 cents each in 1,000 quantities. Samples of the TPS28225, design application notes and TI's online power management selection tool are available through the company's website.

- Vince Biancomano

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Related Datasheets
Part Number Description Category
? TPS28225 High Frequency 4-A Sink Synchronous MOSFET Driver ICs, Interface



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