A3967: Microstepping Driver with Translator

The A3967SLB is a complete microstepping motor driver with built-in translator. It is designed to operate bipolar stepper motors in full-, half-, quarter-, and eighth-step modes, with output drive capability of 30 V and ±750 mA. The A3967SLB includes a fixed off-time current regulator that has the ability to operate in slow, fast, or mixed current-decay modes. This current-decay control scheme results in reduced audible motor noise, increased step accuracy, and reduced power dissipation.

The translator is the key to the easy implementation of the A3967SLB. By simply inputting one pulse on the STEP input the motor will take one step (full, half, quarter, or eighth depending on two logic inputs). There are no phase-sequence tables, high-frequency control lines, or complex interfaces to program. The A3967SLB interface is an ideal fit for applications where a complex µP is unavailable or over-burdened.

Internal circuit protection includes thermal shutdown with hysteresis, under-voltage lockout (UVLO) and crossover-current protection. Special power-up sequencing is not required.

The A3967SLB is supplied in a 24-lead SOIC with copper batwing tabs. The tabs are at ground potential and need no insulation. A leadfree (100% matte tin leadframe) version is also available.

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  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • ±750 mA, 30 V Output Rating
  • Satlington® Sink Drivers
  • Automatic Current Decay Mode Detection/Selection
  • 3.0 V to 5.5 V Logic Supply Voltage Range
  • Mixed, Fast, and Slow Current-Decay Modes
  • Internal UVLO and Thermal Shutdown Circuitry
  • Crossover-Current Protection

The A3967 is supplied in a 24-lead SOIC with copper batwing tabs. The tabs are at ground potential and need no insulation. A leadfree (100% matte tin leadframe) version is also available.

 LB-Batwing SOIC 24 pin

Microstepping Diagrams

Full Step OperationHalf Step Operation

Quarter Step OperationEighth Step Operation

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Functional Block Diagram Pinout Diagram

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A3967SLBTR-T 24-lead SOIC -20°C to 85°C Yes View Data Contact your
local sales rep
Check stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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