ALLEGRO A4980KLPTR-T

The A4980 is a flexible microstepping motor driver with built-in translator for easy operation. It is a single-chip solution, designed to operate bipolar stepper motors in full-, half-, quarter- and sixteenth-step modes, at up to 28 V and ±1.4 A. The A4980 can be controlled by simple Step and Direction inputs, or through the SPI-compatible serial interface that also can be used to program many of the integrated features and to read diagnostic information. The current regulator can be programmed to operate in fixed off-time or fixed frequency PWM, with several decay modes to reduce audible motor noise and increase step accuracy. In addition the phase current tables can be programmed via the serial interface to create unique microstep current profiles to further improve motor performance for specific applications. The current in each phase of the motor is controlled through a DMOS full bridge, using synchronous rectification to improve power dissipation. Internal circuits and timers prevent crossconduction and shoot-through, when switching between highside and low-side drives. The outputs are protected from short circuits, and features

The A4980 is an automotive stepper motor driver suitable for high temperature applications such as headlamp bending and leveling, throttle control, and gas recirculation control. It is also suitable for other low current stepper applications such as air conditioning and venting. It provides a highly flexible microstepping motor driver that can be configured via the SPI-compatible serial interface. It can be controlled with simple Step and Direction inputs, for high speed stepping applications, or directly through the serial interface by writing a step change value. The two DMOS full bridges are capable of driving bipolar stepper motors in full-, half-, quarter-, eighth- and sixteenth-step modes, at up to 28 V and ±1.4 A. The current in each phase of the stepper motor is regulated by a peak detect PWM current control scheme that can be programmed to operate in fixed off-time or fixed frequency. Several decay modes can be selected to reduce audible motor noise and increase step accuracy. In addition the phase current tables, which default to a sinusoidal current profile, can be programmed via the serial interface to create unique microstep current profiles to further improve motor performance for specific applications. The outputs are protected from short circuits, and features for open load and stalled rotor detection are included. Chip level protection includes hot and cold thermal warning, overtemperature shutdown, and overvoltage and undervoltage lockout.

• Peak motor current up to ±1.4 A, 28 V
• Low RDS(on) outputs, 0.5 Ω source and sink, typical
• Automatic current decay mode detection/selection
• Mixed, Fast, and Slow current decay modes
• Synchronous rectification for low power dissipation
• Internal OVLO, UVLO, and Thermal Shutdown circuitry
• Crossover-current protection
• Short circuit, and open load diagnostics
• Hot and cold thermal warning
• Stall detect features
• SPI-compatible or simple Step and Direction motion control
• Highly configurable via SPI-compatible serial interface

• Automotive stepper motors
• Engine management
• Headlamp positioning