Low-Voltage Stepper/Dual DC Motor Driver


Allegro MicroSystems, Inc. announced today the first device in a planned series of low-voltage motor drivers targeted at the portable market. Allegro’s A3901 is a dual H-bridge low-voltage motor driver capable of operating one stepper motor or two DC motors. MOSFET output stages substantially reduce the voltage drop and the power dissipation of the outputs of the A3901 compared to typical drivers with bipolar transistors.

The A3901 is designed for portable applications with a power off (sleep mode) current of 50 nA (typical) and an operating voltage range of 2.5 V to 5.5 V. Output current can be regulated by pulse width modulating (PWM) the inputs. Both H-bridges can be paralleled for higher current operation. Allegro’s A3901 offers a very small package size, low operating voltage and low voltage drop MOSFET outputs. Internal circuit protection includes thermal shut down with hysteresis, transient-suppression diodes and crossover current protection.

The A3901 is supplied in lead-free (100% matte tin leadframe) ten-lead MLP power package (3 x 3 x 0.75 mm) with exposed thermal pad (suffix EJ). The device is priced at $0.49 in quantities of 1,000 and has a 14-week lead-time to market.

About Allegro
Allegro MicroSystems, Inc. is a supplier of advanced mixed-signal power semiconductors and Hall-effect sensors targeted toward the automotive, communications, computer/office automation, consumer and industrial markets. Allegro maintains a leadership position in the integrated magnetic sensor and integrated motor driver product segments.
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