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A4988 Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A4988 Datasheet(HTML) 1 Page - Allegro MicroSystems |
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1 / 19 page  4988-DS Features and Benefits ▪ Low RDS(ON) outputs ▪ Automatic current decay mode detection/selection ▪ Mixed and Slow current decay modes ▪ Synchronous rectification for low power dissipation ▪ Internal UVLO ▪ Crossover-current protection ▪ 3.3 and 5 V compatible logic supply ▪ Thermal shutdown circuitry ▪ Short-to-ground protection ▪ Shorted load protection ▪ Five selectable step modes: full, 1/2, 1/4, 1/8, and 1/16 Package: Description The A4988 is a complete microstepping motor driver with built-in translator for easy operation. It is designed to operate bipolar stepper motors in full-, half-, quarter-, eighth-, and sixteenth-step modes, with an output drive capacity of up to 35 V and ±2 A. The A4988 includes a fixed off-time current regulator which has the ability to operate in Slow or Mixed decay modes. The translator is the key to the easy implementation of the A4988. 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 A4988 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened. During stepping operation, the chopping control in the A4988 automatically selects the current decay mode, Slow or Mixed. In Mixed decay mode, the device is set initially to a fast decay for a proportion of the fixed off-time, then to a slow decay for the remainder of the off-time. Mixed decay current control results in reduced audible motor noise, increased step accuracy, and reduced power dissipation. DMOS Microstepping Driver with Translator and Overcurrent Protection Continued on the next page… A4988 Microcontroller or Controller Logic V DD VREF GND GND RESET ENABLE SLEEP DIR MS2 MS3 MS1 STEP VBB1 CP1 VCP VREG VDD ROSC 5 kΩ 0.22 μF 0.22 μF 0.1 μF0.1 μF 100 μF CP2 VBB2 OUT1A OUT1B SENSE1 OUT2A OUT2B SENSE2 A4988 Approximate size 28-contact QFN with exposed thermal pad 5 mm × 5 mm × 0.90 mm (ET package) Typical Application Diagram |
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