Allegro MicroSystems Europe has released the A3916 low voltage bipolar stepper or dual DC motor driver IC. The new device is designed for Pulse-Width-Modulated (PWM) control of low-voltage stepper motors or dual DC motors using just four external components, and is capable of output currents up to 1A per channel and operating voltages from 2.7-15V.
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 (TSD) 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 3×3mm 16-terminal QFN (suffix ES) and a drop-in replacement for the A3916 in a low-profile 4x4mm 20-terminal QFN (suffixes ES and -1). Both products have an exposed power tab for enhanced thermal dissipation.