New Industry Products

Allegro Micro Announces New Automotive Grade Full Bridge MOSFET Pre-Driver IC

June 03, 2008 by Jeff Shepard

Allegro MicroSystems, Inc. announced a new H-bridge device to complement their existing line of automotive grade MOSFET pre-driver ICs. Allegro’s new device is designed in the latest generation BCD process and includes enhanced features, which is make the A3941 an suitable choice for high-temperature automotive systems and industrial systems utilizing a 24V battery. It is claimed that significant improvements have been made to the fault diagnostics, input logic flexibility and bootstrap charge management.

According to the company, an area of considerable focus in the automotive market is finding new technologies to replace belt-driven and hydraulic actuators with more efficient systems. Most belt-driven actuators provide a loss to system efficiency even when not in use. Eliminating this older technology is made possible by the adoption of full electronic systems, which utilize various electric motor technologies to replace the belt driven actuators.

Allegro’s A3941 is designed to fit the emerging needs of this market and is capable of driving four external N-Channel MOSFETs in a full-bridge configuration. It is typically used in brush dc motor drive applications where high-currents in combination with high ambient temperatures require the use of external MOSFETs. This new device is designed with high-temperature automotive applications in mind and is rated over the full automotive temp range (-40 to +150°C junction temp) and the full battery supply range of 7 to 50V.

Allegro’s new device is priced at $1.95 in quantities of 1,000 and has a 12-week typical lead-time to market.