Three-phase MOSFET driver IC has on-board regulator
To supply power to both sensors and microprocessors, a three-phase MOSFET driver IC from Allegro Microsystems Europe has an integrated low dropout regulator supplying 5.0 or 3.3V.
The Allegro 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 flexibility over commutation, adds Allegro.
A charge pump regulator provides over 10V gate drive at power supply voltages down to 7.0V and allows the A4919 to operate with reduced gate drive at power supply voltages down to 5.5V. A bootstrap capacitor is used to provide the 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 over-temperature conditions are indicated by a single open-drain fault output. Product variants include either 5.0 or 3.3V LDO. An option without LDO 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 5.0 x 5.0 x 0.90mm (QFN package) both with an exposed pad for enhanced thermal performance. Both packages are lead- (Pb) free, with 100 per cent matt-tin leadframe plating (suffix T).
Allegro MicroSystems develops, manufactures and markets semiconductors for the automotive market, office automation, industrial, and consumer/communications.
Allegro MicroSystems Europe is headquartered in Chertsey, United Kingdom, and is the European sales and marketing operation. It operates a network of representatives and distributors throughout Europe.