Motor Driver Has A Split Personality

Whichever way you want to look at it, Allegro’s AMT49702 performs as an automotive bipolar stepper motor driver IC or dual DC motor driver IC that is designed for pulse-width-modulated (PWM) control of low-voltage stepper motors and dual or single high current DC motors. The device is capable of output currents up to 1A per channel and operating voltages from 3.5V to 15V. Key applications include heads-up-display (HUD), mirror positioning and dust cover, screen lift, driver attention monitor, camera movement or focus, and steering wheel feedback vibration alert.


The device is an automotive-grade device and is tested across extended temperature and voltage ranges to ensure compliance in automotive or industrial applications. It has an internal fixed off-time PWM timer that sets a peak current based on the selection of a current sense resistor. An output fault flag is provided that notifies the user of a TSD or overcurrent protection event.


The AMT49702 comes in a low-profile 16-lead TSSOP (suffix “LP”) with exposed power tab for enhanced thermal dissipation. It is priced at $1.61 each/1,000. For more details and specs, an AMT49702 datasheet is available. Allegro MicroSystems, Worcester, MA. 508-853-5000

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