A5984: DMOS Microstepping Driver with Translator and Overcurrent Protection


The A5984 is a complete microstepping motor driver with built-in translator for easy operation. It is designed to operate bipolar stepper motors from full-step up to 1/32 step modes. Step modes are selectable by MSx logic inputs. It has an output drive capacity of up to 40 V and ±2 A.

A5984 introduces a proprietary QuietStepTM algorithm to optimize the current waveform over a wide range of stepper speeds and stepper motor characteristics. QuietStepTM adjusts on-the-fly the amount of fast decay during a PWM cycle to keep current ripple at a low level over the various operating conditions. This adaptive feature improves performance of the system resulting in reduced audible motor noise, reduced vibration, and increased step accuracy.

The translator is the key to the easy implementation of the A5984. Simply inputting one pulse on the STEP input drives the motor one microstep. There are no phase sequence tables, high frequency control lines, or complex interfaces to program. The A5984 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened.

The ET package meets customer requirements for no smoke no fire (NSNF) designs by adding no-connect pins between critical output, sense, and supply pins. So, in the case of a pin-to-adjacent-pin short, the device does not cause smoke or fire. Additionally, the device does not cause smoke or fire when any pin is shorted to ground or left open.

Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation. Internal circuit protection includes: thermal shutdown with hysteresis, undervoltage lockout (UVLO), and crossover-current protection. Special power-on sequencing is not required.

The A5984 is supplied in three surface mount packages: two QFN packages, the 4 mm × 4 mm, 0.75 mm nominal overall height ES package, and the 5vmm × 5 mm × 0.90 mm ET package. The LP package is a 24‑pin TSSOP. All three packages have exposed pads for enhanced thermal dissipation, and are lead (Pb) free (suffix –T), with 100% matte-tin-plated leadframes.


  • Video Security Cameras
  • Printers
  • Scanners
  • Robotics
  • ATM
  • POS

Top Features

  • Drop-in replacement for A4984
  • Proprietary QuietStep option
  • Low RDS(on) outputs
  • Single supply
  • Microstepping up to 32 microsteps per full step
  • Full torque step modes
  • Short-to-ground protection
  • Shorted load protection
  • Short-to-battery protection
  • Fault output
  • Low current Sleep mode, < 10 μA
  • No smoke no fire (NSNF) compliance (ET package)
  • Thin profile QFN and TSSOP packages
  • Thermal shutdown circuitry
  • Synchronous rectification for low power dissipation
  • Internal UVLO
  • Crossover-current protection

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
APEK5984GES-01-WO DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Distributor Stock
A5984GESTR-T 24-lead QFN -40°C to 105°C Yes View Data Contact your
local sales rep
Distributor Stock
A5984GETTR-T 32-lead QFN -40°C to 105°C Yes View Data Contact factory Contact your
local sales rep
Distributor Stock
A5984GLPTR-T 24-lead TSSOP -40°C to 105°C Yes View Data Contact your
local sales rep
Distributor 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.