A4915 Three-Phase MOSFET Controller IC

By Allegro MicroSystems, LLC 65

A4915 Three-Phase MOSFET Controller IC

Allegro's A4915 is designed for pulse width modulated (PWM) current control of 3-phase, brushless DC motors. The A4915 is capable of high current gate drive for 6 all N-channel power MOSFETs. An internal charge pump ensures gate drive down to 7 V supply and provides limited gate drive down to 5 V. A bootstrap capacitor is used to generate a supply voltage greater than the source voltage of the high side MOSFET, required for N-channel MOSFETs.

Internal synchronous rectification control circuitry improves power dissipation in the external MOSFETs during PWM operation. Internal circuit protection includes latched thermal shutdown, dead time protection, and undervoltage lockout. Special power up sequencing is not required.

The A4915 comes in a 28-pin TSSOP with an exposed thermal pad (suffix LP) and a 28-contact 5 mm × 5 mm QFN with an exposed thermal pad (suffix ET). These packages are lead (Pb) free, with 100% matte-tin, leadframe plating.

  • Wide operating voltage range, from 5 V to 50 V
    • Designed to drive BLDC motors in battery powered applications down to very low battery voltage, and to support Li-ion supplies above 20 V
  • Offered in both QFN and TSSOP exposed pad packages
    • Flexibility for customer to choose lower cost QFN or TSSOP with inspectable leads
  • Integrated voltage-to-PWM generator
    • Allows very simple speed control from analog voltage input
  • Center-aligned PWM capability
    • Current recirculation alternates from high side to low side, evenly spreading power dissipation between high side and low side external FETs
  • Power tools
    • Drills, table saws, grinders
  • Lawn and garden equipment
    • Lawn mowers, leaf blowers
  • Household
    • Shop vacuums
  • Pumps
    • Automated coffee machines

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