A4988 Stepper Motor Driver Module

The A4988 is a comprehensive micro stepping motor driver with an integrated translator for simple operation. This product operates bipolar stepper motors with output drive capacities of up to 35 V and 2 A and is available in full, half, 1/4, 1/8, and 1/16 step modes. The A4988 has a fixed off-time current regulator that may be set to slow, mixed or exponential decay. The A4988 converter is essential for a simple implementation. As long as the "step" input sends one pulse, the motor will move one micro-step. There are no phase sequence tables to programme, nor are there any high-frequency control lines or sophisticated interfaces. When a complicated microprocessor is unavailable or overworked, the A4988 interface is ideal. The A4988 chopping control inside automatically picks the current decay mode during micro-step operation (slow or mixed). The device is initially set to a fixed downtime in some quick decay, then the rest of the slow decay downtime is in mixed decay mode. Reduced audible motor noise, increased step accuracy, and lower power consumption are all benefits of the mixed decay current management method. Internal synchronous rectification control circuitry is included to reduce the power consumption of the pulse-width modulation (PWM) operation. Thermal shutdown with hysteresis, under-voltage lockout (UVLO), and crossover-current protection are all included in the internal circuit protection. power sequencing that is unique. The A4988 surface mount QFN package (ES) has an exposed pad for improved thermal dissipation and a nominal total package height of 0.90 mm.This packaging is made of Pb (suffix-T) and has a matte tin lead-frame coating.

Specifications

·       Supply Voltage : 8-35 VDC.

·       Current : 1.0A  (no heatsink ).

·       Current : 2.0A (with heat-sinking).

·       logic input : 3 – 5.5V .

·       Automatic current decay mode detection / choice.

·       Mixed with slow current decay mode.

·       Automatic current decay mode detection/choice.

·       Mixed with slow current decay mode.

·       Low RDS (On) Output

·       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

·       Module Dimension: 11X15.5X19.9mm

·       Module Weight: 2g.