A3982 SLBT – IC

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A3982 SLBT – IC

The A3982 is a complete stepper motor driver with a built-in translator that simplifies its operation. It can drive bipolar stepper motors in full- and half-step modes, with a maximum output of 35 V and ±2 A. The A3982 has a fixed off-time current regulator that can work in Slow or Mixed decay modes. The translator makes the A3982 easy to use. Just input one pulse on the STEP input and the motor moves one step. No need for phase sequence tables, high frequency control lines, or complex programming. The A3982 is ideal for applications where a complex microprocessor is not available or too busy. The A3982 automatically chooses the current decay mode (Slow or Mixed) based on the chopping control. When the STEP input pin receives a signal, the A3982 checks if the current in each motor phase increases or decreases as a result of the step. If it increases, the decay mode is Slow. If it decreases, the decay mode is Mixed (first fast decay for 31.25% of the fixed off-time, then slow decay for the rest of the off-time). This way of controlling current decay reduces motor noise, improves step accuracy, and lowers power consumption. The A3982 also has internal synchronous rectification control circuitry that enhances power efficiency during PWM operation. The A3982 has internal circuit protection features such as thermal shutdown with hysteresis, undervoltage lockout (UVLO), and crossover-current protection. No special power-on sequence is needed. The A3982 comes in a 24-pin wide-body SOIC (package LB) with internally fused power ground leads for better heat dissipation. It is lead (Pb) free, with a lead frame plated with 100% matte tin.

Features

▪ Low RDS (on) outputs
▪ Automatic current decay mode detection/selection
▪ Mixed and Slow current decay modes
▪ Synchronous rectification for low power dissipation
▪ Internal UVLO and thermal shutdown circuitry
▪ Crossover-current protection

Package Includes

1 x A3982 SLBT – IC

Datasheet:

A3982 SLBT – IC Overview

The A3982 SLBT – IC is a dedicated stepper motor driver with an integrated translator, designed to simplify the control of bipolar stepper motors. Capable of operating in full- and half-step modes, it delivers up to 35 V and ±2 A, making it ideal for precision motion applications where ease of use and reliability are paramount.

Key Features of A3982 SLBT – IC

• Mixed and Slow current decay modes for optimized current regulation
• Synchronous rectification reduces power dissipation and heat buildup
• Built-in undervoltage lockout (UVLO) and thermal shutdown circuitry for robust protection
• Crossover-current protection prevents shoot-through faults
• On-chip translator: one STEP pulse moves motor one step—no complex phase sequencing
• Genuine part with fast shipping from Zbotic across India

Applications and Use Cases

• 3D printers requiring precise layer positioning and quiet operation
• CNC machines and desktop milling for controlled tool movement
• Robotic arms and pick-and-place systems in small automation projects
• Laboratory equipment such as syringe pumps or rotary stages
• Office automation devices like paper feeders and plotters
• Educational robotics kits teaching stepper motor control

How to Use A3982 SLBT – IC

Start by connecting the motor supply voltage (VMOT) up to 35 V and ground pins, then wire the two coil outputs to your bipolar stepper motor. Drive the STEP and DIR inputs from a microcontroller or CNC controller; each STEP pulse advances one step. Set the current limit by selecting the appropriate sense resistor, and ensure proper heat dissipation. The internal translator manages phase sequencing automatically.

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Frequently Asked Questions

What supply voltage and current can the A3982 SLBT handle?

The A3982 SLBT supports motor supply voltages up to 35 V and peak output currents of ±2 A, making it suitable for a wide range of medium-power stepper motors.

How does the current decay mode work on this driver?

This driver features a fixed off-time current regulator that operates in Slow or Mixed decay modes. It automatically selects the optimal decay mode based on timing, ensuring smooth current transitions and reducing audible noise.

What protection features are built into the A3982 SLBT?

The chip includes undervoltage lockout (UVLO), thermal shutdown, and crossover-current protection. These safeguards disable outputs under undervoltage, overtemperature, or shoot-through conditions to prevent damage.