A4989SLDTR-T

The A4989 is a dual full-bridge gate driver with integrated microstepping translator suitable for driving a wide range of higher power industrial bipolar 2-phase stepper motors (typically 30 to 500 W). Motor power is provided by external N-channel power MOSFETs at supply voltages from 12 to 50 VThis device contains two sinusoidal DACs that generate the reference voltage for two separate fixed-off-time PWM current controllers. These provide current regulation for external power MOSFET full-bridges.Motor stepping is controlled by a two-wire step and direction interface, providing complete microstepping control at full, half, quarter, and sixteenth-step resolutions. The fixed-off time regulator has the ability to operate in slow-, mixed-, or fast-decay modes, which results in reduced audible motor noise, increased step accuracy, and reduced power dissipation.

• 2-wire step and direction interface
• Dual full-bridge gate drive for N-channel MOSFETs
• Operation over 12 to 50 V supply voltage range
• Synchronous rectification
• Cross-conduction protection
• Adjustable mixed decay
• Integrated sinusoidal DAC current reference
• Fixed off-time PWM current control
• Enhanced low current control when microstepping
• Pin compatible with the A3986