Allegro MicroSystems announces 3-phase MOSFET driver IC with onboard regulator

Jan. 12, 2018

Worcester, MA. Allegro MicroSystems LLC has announced a new 3-phase MOSFET driver IC with an integrated low-dropout regulator supplying 5 V or 3.3 V. Allegro’s A4919 is designed for a range of industrial applications. It can be controlled with block (trapezoidal), sinusoidal, or vector commutation when interfaced with a microprocessor. The A4919 is designed to be a simple direct control gate driver for both the commercial and industrial markets, providing LDO for peripherals or a microprocessor and providing complete flexibility over commutation.

A unique charge-pump regulator provides full (>10 V) gate drive at power supply voltages down to 7 V and allows the A4919 to operate with reduced gate drive at power-supply voltages down to 5.5 V. A bootstrap capacitor provides the above power supply voltage required for the high-side N-channel MOSFETs. One logic-level input is provided for each of the six power MOSFETs in the 3-phase bridge, allowing motors to be driven with any commutation scheme defined by an external controller. The power MOSFETs are protected from cross-conduction by integrated crossover control.

Motor phase short-to-supply and short-to-ground detection is provided by independent drain-source voltage monitors on each MOSFET. Short faults, supply undervoltage, and chip overtemperature conditions are indicated by a single open-drain fault output. Product variants include either 5.0 V or 3.3 V LDO or an option without LDO that instead provides a voltage input that can be used to monitor an external voltage source.

The A4919 is supplied in a 28-pin TSSOP power package (package type LP) and a 28-terminal 5-mm × 5-mm × 0.90-mm QFN package, both with an exposed pad for enhanced thermal performance. Both packages are lead (Pb) free, with 100% matte-tin leadframe plating (suffix T).

Prices each in quantities of 1,000 range from $2.30 to $2.85.

Click here to download a copy of A4919 3-phase MOSFET driver IC datasheet.

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