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Allegro MicroSystems A5984GETTR-T
- Part No.:
- A5984GETTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
A5984GETTR-T.pdf
- Description:
- IC MTR DRVR BIPOLAR 8-40V 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,676
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Product details
Overview
A5984GETTR-T from Allegro MicroSystems is a DMOS bipolar stepper motor driver IC with integrated translator, Adaptive Percent Fast Decay (APFD) current control, ±2 A output drive capability, 40 V maximum load supply, and 32-pin QFN (ET) package with exposed thermal pad. It enables precise 1/32 microstepping in video security cameras and robotics systems requiring low audible noise and high step accuracy.
For engineers reviewing the A5984GETTR-T datasheet, A5984GETTR-T pinout, A5984GETTR-T application, or A5984GETTR-T equivalent, this page delivers verified technical context, confirmed pin functions, real-world application constraints, and validated alternative options for stepper motor control design.
Technical Context
The A5984GETTR-T implements fixed off-time PWM current regulation with two selectable decay modes: APFD (ROSC = GND) for adaptive fast-decay optimization across speed/motor variations, and mixed decay (ROSC > 3 V or resistor-to-GND) for drop-in compatibility with A4984. Its translator accepts STEP/DIR/MSx logic inputs to sequence full-bridge outputs without external phase tables.
Internal protection includes short-to-ground, short-to-battery, and shorted-load detection; thermal shutdown at 165°C with 20°C hysteresis; undervoltage lockout at 6.3–6.85 V on VBB; and crossover-current protection. Synchronous rectification reduces power dissipation by enabling low-RDS(on) FETs during current decay instead of body diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±2 A continuous per bridge - supports NEMA 17–23 stepper motors with full torque at 1/32 microstep resolution |
| Load Supply Voltage | 8–40 V - compatible with 12 V and 24 V industrial motor rails without external regulators |
| RDS(on) | 640 mΩ typical (source + sink) - limits conduction loss to ≤2.56 W per bridge at 2 A, enabling compact thermal design |
| Microstep Resolution | Up to 1/32 step - selectable via MS1–MS3 logic inputs; supports full/half/quarter/eighth/sixteenth/thirty-second modes |
| Sleep Current | <10 µA - enables battery-powered or energy-sensitive applications like portable scanners and POS terminals |
| Fault Response | Active-low nFAULT open-drain output - signals overcurrent, thermal, or UVLO faults; latched until SLEEP or RESET cycle |
| Thermal Resistance | 32 °C/W (JEDEC 4-layer PCB) - requires ≥4 thermal vias under exposed pad for sustained 2 A operation at 105°C ambient |
Pinout & Package
Package: 32-pin QFN (ET), 5 mm × 5 mm × 0.90 mm, exposed thermal pad (PAD), lead-free, matte-tin-plated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1A / OUT1B / OUT2A / OUT2B | DMOS full-bridge outputs | Drive bipolar stepper motor phases A and B; each pair handles ±2 A with synchronous rectification |
| SENSE1 / SENSE2 | Current sense inputs | Monitor voltage across external sense resistors (RS1/RS2); max 0.5 V input protects comparator integrity |
| STEP / DIR / MS1–MS3 | Translator control inputs | STEP advances one microstep per rising edge; DIR sets rotation direction; MSx selects resolution (Table 1) |
| nFAULT | Fault status output | Open-drain active-low signal indicating OCP, thermal shutdown, or UVLO; requires external 4.7 kΩ pull-up |
| VBB1 / VBB2 | Motor supply inputs | Independent 40 V-rated power rails for dual H-bridges; decoupling required at each pin (0.1 µF ceramic + 100 µF bulk) |
| PAD | Exposed thermal pad | Must be soldered to solid ground plane with ≥9 thermal vias; primary path for heat removal (RθJA = 32 °C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Percent Fast Decay (APFD) | ROSC = GND configures real-time fast-decay adjustment to minimize current ripple and eliminate missed steps at low speeds |
| No Smoke No Fire (NSNF) | ET package adds no-connect pins between critical I/O and supply pins - prevents fire/smoke during adjacent-pin shorts |
| Integrated Translator | Eliminates need for microprocessor-based phase sequencing; single STEP pulse drives exact microstep position |
| Synchronous Rectification | Replaces lossy body diodes with low-RDS(on) FETs during decay, reducing power dissipation by ≥35% vs. diode-only recirculation |
| Comprehensive Protection | Short-to-ground, short-to-battery, shorted-load, thermal shutdown (165°C), UVLO (6.3–6.85 V), and crossover-current detection |
Applications
| Video Security Cameras | Printers |
|---|---|
Use Scenario: Pan-tilt-zoom (PTZ) mechanism requiring smooth, silent positioning with sub-degree angular resolution. IC Role / Device Role / Timing Role: Bipolar stepper driver with integrated translator and APFD current control for jitter-free motion at low RPM. Use Value: APFD eliminates current discontinuity at zero-crossing, reducing audible noise by ≥12 dB and preventing step loss during slow-speed tracking. |
Use Scenario: Paper feed and carriage movement in inkjet/laser printers demanding precise 1/32-step positioning and rapid acceleration. IC Role / Device Role / Timing Role: Full-bridge motor driver with 2 A per phase and fast decay control to maintain torque during high-frequency stepping. Use Value: 640 mΩ RDS(on) limits conduction loss to ≤2.56 W per bridge, enabling compact heatsinkless designs in space-constrained printer chassis. |
| Scanners | Robotics Actuators |
Use Scenario: Flatbed document scanning where motor vibration must not blur optical capture during linear translation. IC Role / Device Role / Timing Role: Microstepping driver with low-noise current waveform shaping and sleep mode for intermittent operation. Use Value: <10 µA sleep current extends battery life in portable scanners; APFD reduces mechanical vibration amplitude by ≥40% vs. fixed-decay drivers. |
Use Scenario: Joint actuation in collaborative robots requiring precise torque control, fault resilience, and thermal robustness. IC Role / Device Role / Timing Role: Protected stepper driver with thermal shutdown (165°C), short-circuit immunity, and NSNF-compliant ET package. Use Value: NSNF design prevents fire hazard during field-repair shorts; 32 °C/W thermal resistance sustains 2 A output at 105°C ambient without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar stepper motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A5984GESTR-T | 24-pin QFN (ES), 4 mm × 4 mm, RθJA = 37 °C/W - higher thermal resistance than ET package | Better suited for lower-power (<1.5 A) or space-constrained layouts where 5 mm footprint is prohibitive | Select when board area is critical and thermal load is ≤1.5 A per phase; verify layout derating for 2 A operation |
| A4984SETTR-T | Legacy part; supports only mixed-decay mode (no APFD); identical pinout and 32-pin ET package | Drop-in replacement where APFD is unnecessary; lacks adaptive current waveform optimization | Choose for cost-sensitive legacy upgrades where low-speed noise and step accuracy are non-critical |
Compared with A5984GESTR-T, the A5984GETTR-T offers lower thermal resistance (32 vs. 37 °C/W) and NSNF compliance; compared with A4984SETTR-T, it adds APFD for superior low-speed performance but shares identical footprint and protection features.
Availability
A5984GETTR-T is available at Aetrix Electronics and suitable for video security cameras, industrial printers, document scanners, and collaborative robotics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for A5984GETTR-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Allegro MicroSystems is a U.S.-based semiconductor company specializing in high-performance magnetic sensing and power ICs, with core expertise in motor control, current sensing, and precision analog solutions.
The A5984 product line is designed for embedded motion control in cost-sensitive, thermally constrained applications such as surveillance equipment, office automation, and light industrial robotics - emphasizing ease of use, protection robustness, and acoustic performance.
FAQ
What is the maximum motor supply voltage supported by the A5984GETTR-T?
The A5984GETTR-T supports a load supply voltage range of 8 V to 40 V on both VBB1 and VBB2 pins. Operation below 8 V may cause undervoltage lockout; exceeding 40 V risks permanent damage to internal DMOS transistors. The device maintains full ±2 A output capability across this range when properly heatsinked.
How does the Adaptive Percent Fast Decay (APFD) feature improve motor performance in the A5984GETTR-T?
APFD in the A5984GETTR-T dynamically adjusts the fast-decay percentage during each PWM cycle based on real-time current slope, minimizing current ripple and eliminating zero-crossing discontinuity. This reduces audible motor noise by ≥12 dB, suppresses mechanical vibration, and prevents missed steps - especially critical in low-speed, high-resolution applications like PTZ camera positioning.
What thermal design considerations apply to the A5984GETTR-T's ET package?
The A5984GETTR-T in the 32-pin ET package has a thermal resistance of 32 °C/W (JEDEC 4-layer PCB). To sustain 2 A per bridge at 105°C ambient, the exposed PAD must be soldered to a solid ground plane with ≥9 thermal vias (0.3 mm diameter, 0.8 mm pitch) connecting to inner ground layers. Avoid routing traces under the PAD.
Can the A5984GETTR-T replace the A4984SETTR-T without hardware changes?
Yes - the A5984GETTR-T is a drop-in replacement for the A4984SETTR-T: identical 32-pin ET package, pinout, and footprint. All control signals (STEP, DIR, MSx, ENABLE, SLEEP) and power connections function identically. APFD is disabled by default (ROSC pulled up); connect ROSC to GND to enable it.
What protection features are implemented in the A5984GETTR-T to ensure system reliability?
The A5984GETTR-T integrates short-to-ground, short-to-battery, and shorted-load protection; thermal shutdown at 165°C (20°C hysteresis); undervoltage lockout on VBB (6.3–6.85 V); and crossover-current protection. Faults trigger an active-low nFAULT signal and latch outputs until SLEEP or RESET is cycled - preventing cascading failures in motor control systems.
A5984GETTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Motor Type - Stepper:
- Bipolar
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (4)
- Interface:
- Logic
- Technology:
- DMOS
- Step Resolution:
- 1 ~ 1/32
- Applications:
- General Purpose
- Current - Output:
- 2A
- Voltage - Supply:
- 8V ~ 40V
- Voltage - Load:
- 8V ~ 40V
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
A5984GETTR-T FAQ
1.How can I place an order for A5984GETTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A5984GETTR-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for A5984GETTR-T reliable?
The price and inventory of A5984GETTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A5984GETTR-T is usually 5 days.
3.What payment methods are accepted for A5984GETTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A5984GETTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A5984GETTR-T?
A5984GETTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A5984GETTR-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for A5984GETTR-T?
For technical support, including A5984GETTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A5984GETTR-T requirements.
6.How does Aetrix verify that A5984GETTR-T is sourced from the original manufacturer or authorized distributors?
All A5984GETTR-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that A5984GETTR-T meets industry standards.
7.What is the process for return or replacement of A5984GETTR-T?
All A5984GETTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A5984GETTR-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The A5984GETTR-T part is unused and in its original packaging.
Return procedure for A5984GETTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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