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   Product Features

The A4988 is a complete microstep motor driver with a built-in converter for easy operation. The product can operate bipolar stepper motors in full, half, 1/4, 1/8 and 1/16 step modes, with output drive performance up to 16V and ±1 A. Typically 12V, the A4988 includes a fixed turn-off time current regulator that can operate in slow or mixed attenuation modes. The converter is key to the A4988's ease of implementation. As long as a pulse is entered in the "step" input, the motor can be driven to produce microsteps. There is no need for phase sequence tables, high frequency control lines or complex interface programming. The A4988 interface is ideal for applications where complex microprocessors are unavailable or overloaded.

The chopper control in the A4988 automatically selects the current decay mode (slow or mixed) during microstep operation. In hybrid attenuation mode, the device is initially set to decay rapidly during part of the fixed downtime and then slowly during the remaining downtime. The hybrid attenuating current control scheme reduces audible motor noise, increases step speed and reduces power consumption. An internal synchronous rectifier control circuit is provided to improve power consumption during pulse width modulation (PWM) operation. Internal circuit protection includes: overheat shutdown with lag, undervoltage lock (UVLO), and cross current protection. No special power ordering is required.

The A4988 is available in a surface-mounted QFN package (ES) measuring 5 mm x 5 mm, with a nominal overall package height of 0.90 mm and an exposed heat dissipation plate for enhanced heat dissipation. The package is lead-free (suffix -T) with mist tin plated pin frames.

   Product Functions and advantages

Low RDS(on) output
Automatic current decay mode detection/selection
Mixed with slow current attenuation mode
Synchronous rectification for low power dissipation
Internal UVLO
Cross current protection
3.3 and 5 V compatible logic power supplies
Overheat shutdown circuit
Ground short circuit protection
Load short circuit protection
Five optional step modes: full, 1/2, 1/4, 1/8 and 1/16

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Advantages of DRV8825 over 4988:

1. Current 2.5A.

2. Support 32 subdivisions.

3, 4 layer PCB board, better heat dissipation performance.

4, the chip internal resistance is smaller, lower heat, better heat dissipation.

Parameters:

Size: 1.5mmX2mm (same as 4988)

Driving current: 2.5A

Subdivision: 1, 1/2, 1/4, 1/4, 1/8, 1/16, 1/32

Manufacturing process: SMT mechanism, non-manual welding, higher yield, more stable performance

Suitable for:

Where a stepper motor needs to be driven.

Is to build 3d printer, cnc, engraving machine and other modules.

Support 3 d printers have Prusa Mendel, ultimaker, printbot, makerbot, etc.

1, suitable for driving 8.2V~45V 2.5A stepper motor below;

2, only simple step and direction control interface;

3, six different stepping modes: full, half, 1/4, 1/8, 1/16, 1/32;

4, adjustable potentiometer can adjust the current output, so as to obtain a higher step rate;

5, automatic current attenuation mode detection/selection;

6. Overheat closing circuit, undervoltage locking, cross current protection;

7, grounding short-circuit protection and loading short-circuit protection

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