Three-phase MOSFET driver with on-board regulator can be used for both sensors and microprocessors

January 02, 2018 // By Nick Flaherty
Allegro Microsystems has launched a three-phase MOSFET driver with an integrated low dropout regulator supplying 5 V or 3.3 V that can be used in both sensor and microprocessor designs.

The A4919 is designed for a wide range of industrial applications, controlled with block (trapezoidal), sinusoidal, or vector commutation when used with a microprocessor or as a simple direct control gate driver for both the commercial and industrial markets.

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 is used to provide 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 three-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 under voltage, 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 and instead provides a voltage input which 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% matt-tin leadframe plating (suffix T).

www.allegro.com

 


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