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Low-voltage PNP transistors suit slim portable apps

Posted: 27 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:PNP transistors? portable devices? PCB?


Zetex Semiconductors has added a pair of low voltage PNP transistors to its low saturation high current SOT23FF transistor range for the slimline portable product designs.

Helping to reduce component counts and increase power density, the ZXTP25020CFF and ZXTP19020DFF serve as cost effective switchers in a variety of portable applications, including linear charging and high side load switching circuits.

"By guaranteeing a reverse blocking capability of 7V, the ZXTP25020CFF removes the need for a series connected Schottky diode in linear chargers," said Echo Li, VP of sales at Zetex Asia Pacific. "This saves up to 50 percent PCB area compared with similar footprint P-channel MOSFETs, which due to their inherent drain-source body diode, require a series Schottky diode."

The SOT23FF package offers an improved thermal resistance of 158C/W giving a power rating of 0.8W from a 15mm x 15mm PCB area, substantially increasing power density when compared to standard SOT23 solutions. Power dissipation can rise to 1.96W for applications where the equivalent PCB space of 50mm x 50mm is available.

In high side switching and load or disconnect switches, the ZXTP19020DFF reduces the voltage drop to just 70mV at 1A and a base drive of 20mA or 160mV at 2A for a 40mA base drive, which can be equated to an equivalent resistance of 70m? - in a PCB footprint of 2.5mm x 3mm.

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