A4989 Dual Full-Bridge MOSFET Driver with Microstepping Translator Features and Benefits Description 2-wire step and direction interface The A4989 is a dual full-bridge gate driver with integrated Dual full-bridge gate drive for N-channel MOSFETs microstepping translator suitable for driving a wide range of Operation over 12 to 50 V supply voltage range higher power industrial bipolar 2-phase stepper motors (typically Synchronous rectification 30 to 500 W). Motor power is provided by external N-channel Cross-conduction protection power MOSFETs at supply voltages from 12 to 50 V. Adjustable mixed decay This device contains two sinusoidal DACs that generate the Integrated sinusoidal DAC current reference reference voltage for two separate fixed-off-time PWM current Fixed off-time PWM current control controllers. These provide current regulation for external power Enhanced low current control when microstepping MOSFET full-bridges. Pin compatible with the A3986 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, Package: 38 pin TSSOP (suffix LD) increased step accuracy, and reduced power dissipation. The translator is the key to the easy implementation of this IC. Simply inputting one pulse on the STEP input drives the motor one step (full, half, quarter, or sixteenth depending on the microstep select input). There are no phase-sequence tables, high frequency control lines, or complex interfaces to program. This reduces the need for a complex microcontroller. Approximate size Continued on the next page Typical Application Diagram 4989-DS, Rev. 1Dual Full-Bridge MOSFET Driver A4989 with Microstepping Translator Description (continued) The above-supply voltage required for the high-side N-channel In addition to crossover current control, internal circuit protection provides thermal shutdown with hysteresis and undervoltage lockout. MOSFETs is provided by a bootstrap capacitor. Efficiency is Special power-up sequencing is not required. enhanced by using synchronous rectification and the power FETs are protected from shoot-through by integrated crossover control This component is supplied in an 38-pin TSSOP (package LD). The and programmable dead time. package is lead (Pb) free, with 100% matte tin leadframe plating. Selection Guide Part Number Packing A4989SLDTR-T Tape and reel, 4000 pieces per reel Absolute Maximum Ratings Characteristic Symbol Notes Rating Units Supply Voltage V 0.3 to 50 V BB Logic Supply Voltage V 0.3 to 7 V DD Logic Inputs and Outputs 0.3 to 7 V SENSEx pins 1 to 1 V Sxx pins 2 to 55 V LSSx pins 2 to 5 V GHxx pins Sxx to Sxx+15 V GLxx pins 2 to 16 V Cxx pins 0.3 to Sxx+15 V Operating Ambient Temperature T Range S 20 to 85 C A Junction Temperature T (max) 150 C J Storage Temperature T 55 to 150 C stg Allegro MicroSystems, LLC 2 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000 www.allegromicro.com