From Makers Electronics's description

Product Description: A4988 Stepper Motor Driver 2A Dedicated to 3D printers, the A4988 driver allows you to control a stepper motor with active maximum current limitation. controller with Arduino Mega 2560 module and A4988 drivers connected. Driver connection To rotate the engine one step at a time, the STEP output must be set to high (logical one), the next sequence of zeroes and ones will move the engine one step at a time, and so on. The direction is selected by entering the appropriate state on the DIR output (e.g. low state – clockwise rotation, low state – opposite). The controller also can select the resolution of the motor. Power supply To supply the logical part of the module, a voltage range from 3 V to 5.5 V is required, which must be applied to the pinVDD. The motor supply voltage from 8 V to 35 V is given per pin VMOT. The system can be controlled by motors with a nominal voltage lower than the required 8 V. For this purpose, the maximum current consumption must be limited using a potentiometer so as not to exceed the permissible motor current. For example, for a motor with a resistance of 5 Ω per coil and a current consumption of 1 A, the nominal supply voltage is 5 V. When supplying 12 V, the current must be limited so that it does not exceed 1 A. Attention! Connecting and disconnecting the motor while the controller is on can damage the system. Resolution Step size is selected using MS1, MS2, and MS3 inputs. The possible settings are shown in the table below. Inputs MS1, MS2 and MS3 have an internal pull-down resistor (100 kΩ). MS1 MS2 MS3 Resolution low low low Full step high low low 1/2 step low high low 1/4 step high high low 1/8th step high high high 1/16 step One pulse given on the STEP pin causes one motor to step in the direction selected by giving the appropriate logical state on the DIR pin. The STEP and DIR outputs are not pulled up internally. If the motor is to turn in only one direction, the DIR pin can be permanently connected to VCC or GND. The system has three more inputs to control power consumption: RESET SLP and EN are described in the documentation . Please note that the RESET pin is not pulled up to anything. If it is not used, it can be connected to the adjacent SLEEP pin. The current limitation of the controller The system can be controlled by motors with a nominal voltage lower than the required 8 V. For this purpose, the maximum current consumption must be limited by means of a potentiometer so as not to exceed the permissible motor current. For example, for a motor with a resistance of 5 Ω per coil and a current consumption of 1 A, the nominal supply voltage is 5 V. When supplying 12 V, the current must be limited so that it does not exceed 1 A. Controller heat dissipation The plate is designed to dissipate the heat at a current consumption of about 1A per coil. If the current is much higher, an external heat sink should be used, which can be mounted with thermally conductive adhesive. Stepper motor driver specification Motor supply voltage: 8 V – 35 V Current: max. 1 A per coil (it is rated for 2 A per coil with sufficient additional cooling). The supply voltage of the logical part: 3 V – 5.5 V Simple control interface 5 different modes of operation: full step, 1/2, 1/4, 1/8 and 1/16 step Possibility to adjust the current drawn by the motor using a potentiometer Soldering gold pin connectors

From Micro Ohm's description

The A4988 driver Stepper Motor Driver is a complete micro-stepping motor driver with built-in converter, easy to operate. It operates from 8 V to 35 V and can deliver up to approximately 1 A per phase without a heat sink or forced air flow (it is rated for 2 A per coil with sufficient additional cooling). A4988 driver Stepper Motor Driver includes a fixed off-time current regulator, the regulator can be in slow or mixed decay mode. The converter is the key to the easy implementation of the A4988. There are no phase sequence tables, the high-frequency control interface programming etc. The application of A4988 interface is very suitable for a complex microprocessor is not available or overload. In the stepping operation, the chopping control in the A4988 automatically selects the current decay mode (slow or mixed). The mix decay current control scheme can reduce the audible motor noise, increased step accuracy, and reduced power consumption. Provide internal synchronous rectification control circuitry, in order to improve the pulse width modulation (PWM) power consumption during operation. Internal circuit protection includes thermal shutdown with hysteresis, under-voltage lockout (UVLO) and crossover current protection. Don’t need special power-up sequencing. A4988 uses surface mount QFN package (ES), the size is 5 mm × 5 mm, nominal overall package height is 0.90 mm, with an exposed thermal pad to enhance the heat dissipation function. Features of A4988 : Automatic current decay mode detection/choice. Mixed with slow current decay mode. The low power dissipation of synchronous rectifier. Internal UVLO(ultra voltage lockout). Crossover current protection. Thermal shutdown circuit. Ground fault protection. Loading and short circuit protection. The optional five-step mode: full, 1/2, 1/4, 1/8 and 1/16. Package Includes : 1 x A4988 Stepper Motor Driver- Normal quality. 1 x Heat sink. Specifications Input Supply Voltage (VDC) 8 ~ 35 Operating Current (A) 1.0A(No Heatsink ), 2.0A (with Heat-Sinking) Logic Input (V) 3 ~ 5.5 Five Step Mode full, 1/2, 1/4, 1/8 and 1/16. Shipment Weight 0.08 kg Shipment Dimensions 5 × 5 × 4 cm DATASHEET

From Ampere Electronics's description

A4988 Stepper Motor Driver – 2A Max. Operating Voltage: 35V Min. Operating Voltage: 8V Max. Current Per Phase: 2A Microstep resolution: Full step, ½ step, ¼ step, 1/8 and 1/16 step Reverse voltage protection: No Dimensions: 15.5 × 20.5 mm (0.6″ × 0.8″) Short-to-ground and shorted-load protection Low RDS(ON) outputs Thermal shutdown circuitry Pin Configuration Pin Name Description VDD & GND Connected to 5V and GND of Controller VMOT & GND Used to power the motor 1A, 1B, 2A, 2B Connected to the 4 coils of motor DIRECTION Motor Direction Control pin STEP Steps Control Pin MS1, MS2, MS3 Microstep Selection Pins SLEEP Pins For Controlling Power States RESET ENABLE Specifications: Motor output voltage 8V – 35V Logic input voltage 3V – 5.5V Continuous current per phase 1A Maximum current per phase 2A Microstep resolution full, 1/2, 1/4, 1/8 and 1/16 Package Includes: 1x Stepper Driver Documents : Datasheet Tutorial Related Products: Motor Drivers

From Most Electronic's description

A4988 Stepper Motor Driver 2A is a high-quality electronic component designed for Arduino, prototyping, and educational electronics. Stepper motor driver Allegro’s A4988 DMOS Micro-stepping Driver with adjustable current limiting, overcurrent and overtemperature protection, and five different microstep resolutions (down to 1/16-step). The driver requires a logic supply voltage (3 – 5.5 V) and a motor supply voltage (8 – 35 )V. It can deliver up to approximately 1 A per phase without a heat sink or forced air flow (it is rated for 2 A per coil with sufficient additional cooling). This A4988 stepper driver is provided with heat sink to protect the board from overheating. It’s perfect for DIY makers, students, and anyone building custom electronic circuits or STEM kits.

Stepper Motor Driver A4988 Module

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From Makers Electronics's description

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