A4970 Motor Driver IC

By Allegro MicroSystems, LLC 221

A4970 Motor Driver IC

The A4970 from Allegro is the Polar Semiconductor Inc. (PSI) replacement device for the UDx2916 (pin-compatible). The A4970 utilizes a DMOS output technology rather than bipolar outputs for the UDx2916. The A4970 motor driver drives both windings of a bipolar stepper motor or bidirectionally controls two DC motors. Both bridges are capable of sustaining 45 V and include internal pulse-width modulation (PWM) control of the output current to 750 mA. For PWM current control, the maximum output current is determined by user selection of a reference voltage and sensing resistor. Two logic-level inputs select output current limits of 0%, 33%, 67%, or 100% of the maximum level. A PHASE input to each bridge determines load current direction.

The device is supplied in a 24-pin surface-mount wide SOIC with two pairs of batwing leads (LB). The webbed-pin construction provides for maximum package power dissipation in the smallest possible construction. The package is lead (Pb) free, with 100% matte tin leadframe plating.

  • 750 mA continuous output current
  • 45 V output sustaining voltage
  • Pin compatible with UDx2916
  • Internal PWM current control
  • Low output saturation voltage
  • Internal thermal shutdown circuitry
  • Internal clamp diodes
  • DMOS outputs

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