Allegro Microsystems A5976GLPTR-T, Stepper Motor Driver IC 28-Pin, TSSOP

Allegro ICs for half- and full-bridge drives (brush motor, dc motor driver, dc brushed motor, brush dc motor)Brush DC motors are the most widely used drivers due to their low cost and simple drive control options. Typical brush DC motors consist of a rotating electromagnet surrounded by a permanent magnet. Rotational torque is produced by the interaction of the magnetic fields and continuous rotation is produced by changing the polarity of the rotating coil with a mechanical commutator and brushes. Typical brush DC motor drivers consist of a half bridge for single direction operation and an H-bridge configuration for bidirectional control. PWM (Pulse Width Modulation) control can be used to regulate motor speed, torque, or position

The A5976 is a complete microstepping motor driver with built-in translator. It is designed to operate bipolar stepper motors in full-, half-, quarter-, and sixteenth-step modes, with output drive capability of 40 V and ±2.8 A. The A5976 includes a fixed off-time current regulator that has the ability to operate in slow-, fast-, or mixed-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 A5976. Simply inputting one pulse on the STEP input drives the motor one step (two logic inputs determine if it is a full-, half-, quarter-, or sixteenth-step). There are no phase sequence tables, high-frequency control lines, or complex interfaces to program. The A5976 interface is an ideal fit for applications where a complex microprocessor is unavailable or overburdened.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-up sequencing is not required.The A5976 is supplied in a thin (<1.2 mm) 28-pin TSSOP with an exposed thermal pad (suffix LP). The package is lead (Pb) free (suffix -T), with 100% matte-tin leadframe plating

±2.8 A, 40 V output rating
Low RDS(on) outputs, 0.22 Ω source, 0.15 Ω sink typical
Automatic current decay mode detection/selection
3 to 5.5 V logic supply voltage range
Mixed, fast, and slow current decay modes
Fault output
Mixed decay for both rising/falling step option
Synchronous rectification for low power dissipation
Internal UVLO and thermal shutdown circuitry
Crossover-current protection
Short-to-ground protection
Short-to-VBB protection
Shorted load protection