Allegro: bipolar stepper or dual DC motor driver IC requires only four external components

New from Allegro MicroSystems Europe is the A3916 low voltage bipolar stepper or dual DC motor driver IC.  The new device is designed for pulse-width-modulated control of low-voltage stepper motors or dual DC motors using just four external components, and is capable of output currents up to 1 A per channel and operating voltages from 2.7 to 15 V.

The A3916 integrates all motor control circuitry including a fixed off-time PWM regulator that sets a peak current in the motor winding based on the selection of a low-value current-sense resistor. A single supply eliminates the need for an external low-dropout regulator, and the integrated charge pump requires only one external capacitor.  Output diagnostics are provided by an active low fault output that notifies the user of a Thermal Shutdown or overcurrent protection event.

The new device is targeted at applications that run off single, Li-ion cell or 3 AA batteries, including office and industrial automation systems, point-of-sale equipment, 3D printers, medical, CCTV and the toy market. Two package options are offered: a low-profile 3 × 3 mm 16-terminal QFN and a drop-in replacement for the A3916 in a low-profile 4 × 4 mm 20-terminal QFN. Both products have an exposed power tab for enhanced thermal dissipation.


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