Allegro MicroSystems, Inc. Introduces New Automotive Grade Three-Phase Mosfet Pre-Driver ICTargeted at Motor System Designers

Worcester, MA ¨C July 8, 2008 ¡ª Allegro® introduces a new automotive grade three-phase MOSFET pre-driver IC targeted at automotive and industrial applications. This new device is a third generation three-phase driver that includes enhanced performance and operational features over its predecessors. Allegro¡¯s new robust design is ideal for systems that use sinusoidal control of the motor phase currents. This commutation method provides smooth operation reducing audible noise and minimizing torque ripple at the load.
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Adoption of three-phase BLDC motors in automotive and industrial applications is growing rapidly in the marketplace. Allegro has addressed this particular need by introducing the A4935 device. This new device integrates a regulating charge pump which provides full gate drive capability for battery voltages (Vbb) down to 7 V and reduced gate drive for battery voltages as low as 5.5 V. It also includes performance enhancements of the current sense amplifier, as well as better fault diagnostics and reporting to decode and identify faults. Features such as top-off charge

pump and boot strap charge management make this new device much easier to manage in terms of ensuring an adequate boot capacitor charge under varying PWM conditions.

Allegro¡¯s A4935KJP-T is supplied in a 48L eLQFP small profile thermally efficient exposed pad package.

About Allegro

Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance power integrated circuits and integrated Hall-effect magnetic sensors. Allegro¡¯s innovative solutions serve high-growth applications within the automotive, communications, computer/office automation, consumer and industrial markets. Allegro is headquartered in Worcester, Massachusetts (USA) with design and applications centers located in North and South America, Asia, and Europe. Further information about Allegro can be found at www.allegromicro.com.

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