Allegro Microsystems, LLC Announces New Three-Phase Mosfet Driver IC
January 02, 2018 at 07:34 pm
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Allegro MicroSystems, LLC announced a new three-phase MOSFET driver IC with an integrated low dropout regulator supplying 5 V or 3.3 V. [/en/Products/Motor-Driver-And-Interface-ICs/BLDC-Drivers/A4919.aspx]Allegro’s A4919 is designed for a wide 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 provide 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 [/en/Products/Motor-Driver-And-Interface-ICs/BLDC-Drivers/A4919.aspx]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 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 and instead provides a voltage input which can be used to monitor an external voltage source.
Allegro MicroSystems, Inc. is a global designer, developer, fabless manufacturer, and marketer of sensor integrated circuits (ICs) and application-specific analog power ICs. The Company is a supplier of magnetic sensor IC solutions in the automotive market. Its sensor ICs enable its customers to precisely measure motion, speed, position and current, while its power ICs include high-temperature and high-voltage capable motor drivers, power management ICs, light-emitting diode driver ICs and isolated gate drivers. Its diverse product portfolio provides solutions for the electrification of vehicles, automotive advanced driver assistance systems (ADAS) safety features, automation for Industry 4.0 and power saving technologies for data centers and green energy applications. The Company, through its subsidiary, Crocus Technology, Inc. offers advanced Tunnel Magnetoresistance (TMR) sensor technology solutions to designers and manufacturers of industrial, automotive and consumer electronics.