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Three-phase MOSFET driver IC powers sensors and microprocessors

The A4919 has an integrated low dropout regulator supplying 5.0 or 3.3V.  It can be controlled with block (trapezoidal), sinusoidal, or vector commutation when interfaced with a microprocessor. It is designed to be a simple direct control gate driver for use in commercial and industrial markets providing LDO for peripherals or a microprocessor.

A unique charge pump regulator provides a minimum 10V gate drive at power supply voltages down to 7.0V and allows the IC to operate with reduced gate drive at power supply voltages down to 5.5V. A bootstrap capacitor provides 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. 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 IC is supplied in a 28-pin TSSOP power package (package type LP) and a 28-terminal 5.0 x 5.0 x 0.9mm (QFN package) both with an exposed pad for enhanced thermal performance. Both packages are lead-free, with 100% matt-tin leadframe plating.


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