The A4919 is a three-phase controller for use with n-channel external power MOSFETs.
A unique charge pump regulator provides full (>10V) gate drive for battery voltages down to 7V and will allow the A4919 to operate with a reduced gate drive down to 5.5V. A bootstrap capacitor is used to provide the above battery supply voltage required for 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 FET. Short faults, supply under-voltage, and chip over temperature conditions are indicated by a single open drain fault output.
Product variants incorporating a low drop out (LDO) regulator to source either 5.0V or 3.3V to external circuitry are available. Those providing a 5.0V output are differentiated by a ‘-5’ part number suffix and 3.3V by ‘-3’.
The A4919 is supplied in a 28-pin TSSOP power package with an exposed thermal pad (package type LP) as well as a 28-pin QFN with an exposed thermal pad (package type ET) will be available in March 2018. Both packages are available in lead (Pb) free versions, with 100% matte tin lead frame plating (suffix –T).