A4988 is a complete microstepping motor driver with built-in translator for easy operation. This product is available in full, half, 1/4, 1/8 and 1/16 step modes operate bipolar stepper motors, output drive capacity of up to 35 V and ± 2 A. A4988 includes a fixed off-time current regulator, the regulator in slow or mixed decay modes. A4988 converter is the key to the easy implementation. As long as the "step" input inputting one pulse drives the motor one microstep. There are no phase sequence tables, high frequency control lines, or complex interfaces to program. A4988 interface is very suitable for complex microprocessor is unavailable or is overburdened.
In the micro-step operation, A4988 chopping control inside automatically selects the current decay mode (Slow or Mixed). In mixed decay mode, the device is initially set to a fixed downtime in some fast decay, then the rest of the slow decay downtime. Mixed decay current control scheme results in reduced audible motor noise, increased step accuracy, and reduced power consumption. Internal synchronous rectification control circuitry is provided to improve the pulse-width modulation (PWM) operation power consumption. Internal circuit protection includes: thermal shutdown with hysteresis, undervoltage lockout (UVLO), and crossover-current protection. Special power sequencing.
A4988 surface mount QFN package (ES), a size of 5 mm × 5 mm, nominal overall package height of 0.90 mm, with an exposed pad for enhanced thermal dissipation. This package is Pb (suffix-T), with 100% matte tin leadframe plating.
Simple step and direction control interface
Short-to-ground and shorted-load protection
Five different step resolutions: full-step, half-step, quarter-step, eighth-step, and sixteenth-step
Intelligent chopping control that automatically selects the correct current decay mode (fast decay or slow decay)
Over-temperature thermal shutdown, under-voltage lockout, and crossover-current protection
Adjustable current control lets you set the maximum current output with a potentiometer, which lets you use voltages above your stepper motor’s rated voltage to achieve higher step rates
1 x Step motor driver module
1 x Heatsink
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All available stocked item orders are shipped the next working day, our UK mainland deliveries are free, where a tracked service has been used we shall provide you with the tracking number. This will allow you to track your parcel and alter delivery options, such as 'Leave in a safe place' or 'Hand to concierge' where possible.
Orders placed after 1pm will be posted the next working morning. This is to help us comply with the essential travel/lockdown requests by the government.
Free UK Mainland 2 to 3 day deliveries are shipped through Hermes 2 to 3 day service, smaller low cost items Royal Mail 1st class. Please check the product pages for more details on that product's shipping methods.
Pre-Orders will be shipped as soon as stock arrives at our UK warehouse, we will send an update when your order has been dispatched. Please note, dates given are approximate and may change due to unforseen circumstances. Should your order be unexpectedly delayed will will inform you to keep you updated.
Our 'To Order' lines will be shipped direct and from our China warehouses, these typically take up to 20 days to arrive, however due to the current crisis please allow up to 40 days.
Any 'To Order' item is shipped with a tracking number that we will send you once live to allow you to monitor the progress of your item.
We welcome orders from International customers, currently we do not have postal options set on the site so please contact us and we can arrange delivery on most items.
Currently we cannot ship PPE, Masks or similar items out of the country, we apologise for this however if you require PPE items please use our contact form, we may be able to help.
If you are local to Central Croydon in the areas shown below we may deliver by hand within 2 days, this saves you waiting for the Royal Mail while they are busy delivering more than they could ever expect during this time.
These areas include: East, West, South, Central Croydon, Coulsdon, Thornton Heath, Norbury, South Norwood, Woodside, Crystal Palace, Upper Norwood, Waddon, Wallington, Shirley, New Addington, Sanderstead, Selhurst and Kenley. We will also cover West Wickham, Penge and Anerley as they are close enough to Croydon.