Stepper Motor Drive Circuit


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PDIP (N) 16 181 mm² 19.3 x 9.4 open-in-new Find other Stepper motor drivers


  • Full-Step, Half-Step and Micro-Step Capability
  • Bipolar Output Current up to 1A
  • Wide Range of Motor Supply Voltage 10-46V
  • Low Saturation Voltage with Integrated Bootstrap
  • Built-In Fast Recovery Commutating Diodes
  • Current Levels Selected in Steps or Varied Continuously
  • Thermal Protection with Soft Intervention
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The UC3717A is an improved version of the UC3717, used to switch drive the current in one winding of a bipolar stepper motor. The UC3717A has been modified to supply higher winding current, more reliable thermal protection, and improved efficiency by providing integrated bootstrap circuitry to lower recirculation saturation voltages. The diagram shown below presents the building blocks of the UC3717A. Included are an LS-TTL compatible logic input, a current sensor, a monostable, a thermal shutdown network, and an H-bridge output stage. The output stage features built-in fast recovery commutating diodes and integrated bootstrap pull up. Two UC3717As and a few external components form a complete control and drive unit for LS-TTL or micro-processor controlled stepper motor systems.

The UC3717A is characterized for operation over the temperature range of 0°C to +70°C.

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Technical documentation

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Type Title Date
* Datasheet Stepper Motor Drive Circuit datasheet Sep. 05, 1999
Technical articles Drive unipolar stepper motors as bipolar stepper motors with a simple wiring reconfiguration Apr. 09, 2020
Technical articles How stepper motors improve noise and efficiency in automotive system design Nov. 19, 2019
White papers How smart tune regulates current in stepper motors (Rev. A) Mar. 19, 2019
Technical articles Getting smart about tuning your stepper motor Aug. 23, 2018
Technical articles The story of motor-drive integration Jan. 09, 2017
Application notes UC3717 and L-C Filter Reduce EMI and Chopping Losses in Step Motor Sep. 05, 1999

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