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Four-channel MOSFET steps up Allegro's portfolio

Posted: 03 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:MOSFET? driver IC? automotive?

Allegro Microsystems Inc. has introduced a new four-channel high-side MOSFET control/driver IC to complement its existing automotive MOSFET pre-driver family. According to Allegro, the A3942 is designed to driver four n-channel MOSFETs in a high-side configuration with gate drive outputs that utilize a current-source topology. By using this topology, the A3942 eliminates the need for gate resistors and bootstrap capacitors, says the company.

The new device is said to contain the necessary blocks required to provide an efficient interface between the system controller and various high current loads typically found in automotive engine control systems. The A3942 operates over a wide voltage range (4.5-60V) and over the full automotive temperature range, making it suitable for both 12V and 24V engine control systems, according to the company. The four outputs can be controlled with either four parallel input lines or through an integrated SPI. Multiple A3942 devices can share an SPI interface by either connecting them in parallel or in a daisy-chained series using the chip select pin to address the appropriate IC. A sleep mode is provided to reduce the quiescent current draw to less than 10?A.

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