Overview
The A4988SETTR-T is a complete microstepping motor driver with a built-in translator, designed and manufactured by Allegro MicroSystems. This device is specifically engineered to operate bipolar stepper motors in various step modes, including full, half, quarter, eighth, and sixteenth steps. The A4988SETTR-T features a fixed off-time current regulator that can operate in slow or mixed decay modes, which helps in reducing audible motor noise, increasing step accuracy, and minimizing power dissipation. The built-in translator simplifies the operation by eliminating the need for complex phase sequence tables or high-frequency control lines, making it an ideal choice for applications where a complex microprocessor is not available or is overburdened.
Key Specifications
| Characteristic | Symbol | Rating | Units |
|---|---|---|---|
| Load Supply Voltage | VBB | 35 | V |
| Output Current | IOUT | ±2 | A |
| Logic Input Voltage | VIN | –0.3 to 5.5 | V |
| Logic Supply Voltage | VDD | –0.3 to 5.5 | V |
| Motor Outputs Voltage | –2.0 to 37 | V | |
| Sense Voltage | VSENSE | –0.5 to 0.5 | V |
| Reference Voltage | VREF | 5.5 | V |
| Operating Ambient Temperature | TA | –20 to 85 | °C |
| Maximum Junction Temperature | TJ(max) | 150 | °C |
| Storage Temperature | Tstg | –55 to 150 | °C |
| Package Type | 28-contact QFN with exposed thermal pad | ||
| Package Dimensions | 5 mm × 5 mm × 0.90 mm |
Key Features
- Low Rds(on) outputs for high efficiency
- Automatic current decay mode detection/selection (slow and mixed decay modes)
- Synchronous rectification for low power dissipation
- Internal undervoltage lockout (UVLO) and thermal shutdown circuitry with hysteresis
- Crossover-current protection and short-to-ground protection
- 3.3 and 5 V compatible logic supply
- Five selectable step modes: full, 1/2, 1/4, 1/8, and 1/16
- Sleep mode to minimize power consumption when the motor is not in use
- Lead (Pb) free with 100% matte tin plated leadframes
Applications
The A4988SETTR-T is suitable for a variety of applications involving bipolar stepper motors, including but not limited to:
- 3D printers and CNC machines
- Automated manufacturing systems
- Medical devices requiring precise motor control
- Industrial automation and robotics
- Consumer electronics with motorized components
Q & A
- What is the maximum output current of the A4988SETTR-T?
The maximum output current is ±2 A.
- What are the available step modes for the A4988SETTR-T?
The available step modes are full, 1/2, 1/4, 1/8, and 1/16.
- What is the maximum load supply voltage for the A4988SETTR-T?
The maximum load supply voltage is 35 V.
- Does the A4988SETTR-T have built-in thermal protection?
Yes, it includes thermal shutdown circuitry with hysteresis.
- What is the package type of the A4988SETTR-T?
The package type is a 28-contact QFN with an exposed thermal pad.
- Is the A4988SETTR-T lead-free?
Yes, it is lead (Pb) free with 100% matte tin plated leadframes.
- What are the logic supply voltage requirements for the A4988SETTR-T?
The logic supply voltage can be either 3.3 V or 5 V.
- Does the A4988SETTR-T have a sleep mode to reduce power consumption?
Yes, it has a sleep mode to minimize power consumption when the motor is not in use.
- What kind of current decay modes does the A4988SETTR-T support?
The A4988SETTR-T supports slow and mixed current decay modes.
- What is the operating ambient temperature range for the A4988SETTR-T?
The operating ambient temperature range is –20 to 85 °C.
