A3930 and A3931
Automotive 3-Phase BLDC Controller and MOSFET Driver
FEATURES AND BENEFITS
▪ High current three-phase g...
A3930 and A3931
Automotive 3-Phase BLDC Controller and
MOSFET Driver
FEATURES AND BENEFITS
▪ High current three-phase gate drive for N-channel
MOSFETs
▪ Synchronous rectification ▪ Cross-conduction protection ▪ Charge pump and top-off charge pump for 100% PWM ▪ Integrated commutation decoder logic ▪ Operation over 5.5 to 50 V supply
voltage range ▪ Extensive diagnostics output ▪ Provides +5 V Hall sensor power ▪ Low-current sleep mode
PACKAGE:
48-Lead LQFP with exposed thermal pad (suffix JP)
Not to scale
DESCRIPTION
The A3930 and A3931 are three-phase brushless DC (BLDC) motor controllers for use with N-channel external power
MOSFETs. They incorporate much of the circuitry required to design a cost-effective three-phase motor drive system, and have been specifically designed for automotive applications.
A key automotive requirement is functionality over a wide input supply range. A unique charge pump regulator provides adequate (>10 V) gate drive for battery
voltages down to 7 V, and allows the device to operate with a reduced gate drive at battery
voltages down to 5.5 V. Power dissipation in the charge pump is minimized by switching from a
voltage doubling mode at low supply
voltage to a dropout mode at the nominal running
voltage of 14 V.
A bootstrap capacitor is used to provide the above-battery supply
voltage required for N-channel
MOSFETs. An internal charge pump for the high-side drive allows for DC (100% duty cycle) operation.
Internal fixed-frequency PWM current co...