|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.