Three-Phase MOSFET Driver
Description
A4919
Three-Phase MOSFET Driver with Integrated Regulator
FEATURES AND BENEFITS
• High-current 3-phase gate drive for N-channel MOSFETs • 5.
5 to 50 V supply voltage range • Regulated logic supply voltage output option • Low-current Sleep mode option • Motor phase short-to-supply and short-to-ground detection • Cross-conduction protection • Undervoltage, overtemperature monitors
APPLICATIONS
• Lawn and garden equipment • Battery-operated power tools • Industrial grinders • Continuous positive airway pressure (CPAP) machines • Vacuum cleaners
PACKAGE:
28-pin TSSOP with exposed thermal pad
(suffix LP)
28-terminal 5 mm × 5 mm QFN with exposed thermal pad
(suffix ET)
Not to scale
DESCRIPTION
The A4919 is a three-phase controller for use with N-channel external power MOSFETs.
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 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 MOSFET.
Short faults, supply undervoltage, and chip overtemperature conditions are indicated by a single opendrain fault output.
Product variants incorporating a low dropout (LDO) regulator to source either 5.
0 V or 3.
3 V to external circuitry are available.
The A4919 is supplied in a 28-pin TSSOP power package with exposed thermal pad (package type LP) and a 28-terminal 5 mm × 5 mm × 0.
90 mm QFN package with exposed thermal pad.
Both packages are lead (Pb) free, with 100% matte-tin leadframe plating (suffix T).
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