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Allegro MicroSystems A5990GEVSR-T
- Part No.:
- A5990GEVSR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
A5990GEVSR-T.pdf
- Description:
- IC MTR DRVR BIPOLAR 8V-40V 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,450
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Product details
Overview
A5990GEVSR-T from Allegro MicroSystems is a quad DMOS full-bridge PWM motor driver IC designed for precise bipolar stepper and DC motor control in embedded motion systems. It integrates four independent 40 V, 1.6 A full-bridge outputs, fixed off-time PWM current regulation with externally adjustable off-time per bridge pair, adaptive percent fast decay (APFD), and synchronous rectification. It supports full/half/quarter-step sequencing for up to two stepper motors or forward/reverse/coast control for four DC motors - deployed in industrial automation actuators, medical fluid pumps, and precision lab instrumentation.
For engineers reviewing the A5990GEVSR-T datasheet, A5990GEVSR-T pinout, A5990GEVSR-T application, or A5990GEVSR-T equivalent, key selection considerations include its 40-pin QFN EV package with exposed thermal pad, dual VBB supplies (VBB1/VBB2), independent ROSC-based off-time tuning for bridge pairs, APFD logic input behavior, and discontinuation status requiring transition planning.
Technical Context
The A5990GEVSR-T implements four N-channel DMOS full-bridges with internal PWM current regulation using fixed off-time architecture, where each bridge pair (1&2, 3&4) has independently configurable off-time via ROSC1/ROSC2 pins. Current limiting is set by external sense resistors (RSx) and per-bridge VREFx inputs, supporting trip-level calculation ITripMax = VREF / (3 × RS).
It features adaptive percent fast-decay (APFD) mode - enabled by pulling APFD low - which dynamically adjusts fast-decay duration to minimize current ripple and power loss, plus mixed-decay operation (30.1% fast decay + remainder slow decay) when APFD is disabled. Synchronous rectification reduces conduction losses during decay phases, and blanking (~1 µs) prevents false overcurrent detection during switching transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output rating | 40 V max load supply; supports motors up to 40 V bus voltage without external clamping. |
| Continuous output current | 1.6 A per full-bridge; derated based on ambient temperature and PCB thermal design (RθJA = 27 °C/W). |
| Current regulation | Fixed off-time PWM with external ROSC resistor adjustment; 8.1 µs (ROSC = GND) or ~30 µs (ROSC > 3 V). |
| VREF input range | 0.0–1.5 V per bridge; sets peak current via ITripMax = VREF / (3 × RS), enabling fine-grained step resolution. |
| Logic interface | 3.3 V/5 V compatible PHASE/I0x/I1x control; supports full/half/quarter-step modes and DC motor forward/reverse/coast. |
| Protection features | UVLO (7.6 V threshold), thermal shutdown (165 °C typical), crossover-current protection, and latched overcurrent fault. |
| Sleep mode current | <1 µA quiescent draw; disables charge pump and most internal circuitry to minimize system standby power. |
Pinout & Package
The A5990GEVSR-T is housed in a 6 mm × 6 mm, 0.90 mm nominal height, 40-pin QFN package (EV) with an exposed thermal pad for enhanced heat dissipation. The package is lead-free with 100% matte-tin leadframe plating and requires soldering of the thermal pad to a dedicated PCB ground plane with thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1A–OUT4B | DMOS full-bridge output terminals | Four independent H-bridge outputs; each pair (e.g., OUT1A/OUT1B) drives one motor winding or DC motor. |
| SENSE1–SENSE4 | Current sense comparator inputs | Low-impedance connections to external sense resistors (RSx); must stay within ±500 mV to avoid damage or regulation error. |
| VREF1–VREF4 | Analog reference inputs | Set per-bridge peak current; 0–1.5 V range enables programmable step amplitude and dynamic current scaling. |
| ROSC1, ROSC2 | Off-time configuration inputs | Resistor-biased pins setting fixed off-time independently for bridges 1&2 (ROSC1) and bridges 3&4 (ROSC2). |
| APFD | Adaptive decay mode control | Active-low logic input: tied low enables APFD; floating/high selects fixed 30.1% fast-decay mixed mode. |
| SLEEPn | Active-low sleep enable | Pulling low disables drivers, charge pump, and internal logic; restores full operation on rising edge after release. |
| FAULTn | Open-drain fault indicator | Pulled low during UVLO, thermal shutdown, or latched overcurrent; requires external pull-up for system monitoring. |
| VBB1, VBB2 | Load supply inputs | Independent 8–40 V supplies for bridge pairs 1&2 (VBB1) and 3&4 (VBB2); decoupling required per datasheet layout. |
| VCP, CP1, CP2 | Charge pump terminals | VCP connects to reservoir capacitor; CP1/CP2 form flying capacitor network to generate gate drive voltage > VBB. |
| PHASE1–PHASE4, I01–I04, I11–I14 | Stepper/DC motor control inputs | Industry-standard 2-bit phase + direction interface per bridge; defines step sequence, direction, and enable state. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive percent fast decay (APFD) | Automatically optimizes fast-decay ratio per winding to reduce current ripple, improve step accuracy, and lower power dissipation across varying loads. |
| Independent bridge off-time tuning | ROSC1/ROSC2 allow separate optimization of PWM timing for different motor types or supply conditions - e.g., higher off-time for low-VBB or high-inductance windings. |
| Synchronous rectification | Replaces body-diode conduction with low-RDS(on) MOSFET paths during decay, cutting power loss by >30% vs. asynchronous decay at 1.2 A. |
| Per-bridge VREF inputs | Enable dynamic current shaping - e.g., lower VREF during microstepping idle phases to reduce heat while maintaining position hold. |
| Integrated protection suite | Combines UVLO, thermal shutdown with hysteresis, crossover-current blanking, and latched OCP - eliminating need for external fault management circuitry. |
Applications
| Industrial Linear Actuators | Medical Infusion Pumps |
|---|---|
|
Use Scenario: Precision linear positioning in automated valve control and robotic grippers using bipolar stepper motors. IC Role / Device Role / Timing Role: Full/half/quarter-step current-regulated driver managing two independent stepper axes with synchronized microstepping. Use Value: APFD minimizes resonance-induced missed steps at mid-band speeds; independent VREF tuning maintains torque consistency across variable load profiles. |
Use Scenario: Low-noise, high-accuracy peristaltic pumping in portable IV delivery systems. IC Role / Device Role / Timing Role: Dual stepper motor controller for syringe advancement and pressure sensing feedback loop coordination. Use Value: Mixed-decay mode reduces audible motor whine below 20 kHz; thermal shutdown ensures fail-safe stop during occlusion events. |
| Lab Automation Stage Controllers | Print Head Positioning Systems |
|
Use Scenario: Multi-axis microscope stage with sub-micron repeatability requirements in semiconductor metrology tools. IC Role / Device Role / Timing Role: Four-channel DC motor driver for closed-loop focus, tilt, and translation control with coast/brake flexibility. Use Value: Independent ROSC tuning allows optimized response time per axis; sleep mode cuts standby power to <1 µA during idle periods. |
Use Scenario: High-speed bidirectional carriage movement in inkjet printers with rapid acceleration/deceleration cycles. IC Role / Device Role / Timing Role: Quad full-bridge driver powering two stepper motors (carriage + paper feed) and two DC motors (printhead cooling fans). Use Value: Synchronous rectification lowers junction temperature rise by 12 °C at 1.2 A, extending reliability in compact enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad full-bridge motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A5988GEVTR-T | Same EV package, pin-compatible; adds integrated indexer, SPI interface, and enhanced APFD algorithm with faster adaptation. | Supports standalone step/direction-to-motor execution without external microcontroller; better suited for space-constrained designs needing reduced firmware overhead. | Select A5988GEVTR-T for new designs requiring simplified control architecture and improved decay responsiveness. |
| TB6600HG | 60 V rating, 4.5 A peak; no APFD or mixed-decay; uses external oscillator and lacks per-bridge VREF. | Targeted at high-voltage/high-current open-loop stepper systems; lacks adaptive current control and thermal intelligence of A5990GEVSR-T. | Choose TB6600HG only if voltage headroom >40 V or peak current >1.6 A is mandatory and adaptive decay is not required. |
Compared with A5990GEVSR-T, the A5988GEVTR-T offers direct functional upgrade path with SPI configurability and tighter current regulation, while TB6600HG trades intelligence for raw power handling - making both viable only where their specific technical gaps align with system priorities.
Availability
A5990GEVSR-T is available at Aetrix Electronics and suitable for industrial automation, medical device servicing, and legacy equipment repair requiring stable component supply despite its discontinued status. Limited remaining stock is managed under Last-Time-Buy terms with documented traceability.
Supply support for A5990GEVSR-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 designer of high-performance magnetic sensing and power IC solutions, specializing in motion control, current sensing, and motor driver technology since 1989.
The A5990GEVSR-T belongs to Allegro's high-integration stepper/DC motor driver product line, engineered for precision motion systems demanding low acoustic noise, high efficiency, and robust fault resilience in compact industrial and medical platforms.
FAQ
Is A5990GEVSR-T still in production?
No, the A5990GEVSR-T is officially discontinued as of September 30, 2024. Allegro MicroSystems no longer manufactures this part, and samples are unavailable. Aetrix Electronics holds limited remaining inventory for legacy support and repair applications under Last-Time-Buy terms.
What is the recommended replacement for A5990GEVSR-T?
The A5988GEVTR-T is Allegro's designated replacement for the A5990GEVSR-T. It shares the same EV package and pinout, adds SPI programmability and an enhanced APFD algorithm, and supports identical motor configurations - making it the optimal drop-in upgrade for new designs.
Can A5990GEVSR-T drive two stepper motors simultaneously?
Yes, the A5990GEVSR-T is explicitly designed to drive up to two bipolar stepper motors concurrently - using bridges 1&2 for motor 1 and bridges 3&4 for motor 2 - with independent current regulation, step mode control, and off-time tuning for each motor.
What thermal design is required for A5990GEVSR-T at full 1.6 A load?
To sustain 1.6 A per bridge continuously, the A5990GEVSR-T requires its exposed thermal pad soldered to a 2-oz copper ground plane with ≥6 thermal vias (0.3 mm diameter) connecting to inner ground layers. With RθJA = 27 °C/W, ambient must remain ≤75 °C to keep junction temperature below 150 °C.
Does A5990GEVSR-T support microstepping below quarter-step resolution?
No, the A5990GEVSR-T natively supports only full, half, and quarter-step modes via its PHASE/I0x/I1x interface. Finer microstepping (e.g., 1/8 or 1/16) requires external microcontroller interpolation or upgrading to the A5988GEVTR-T, which includes an integrated indexer supporting up to 1/32-step.
A5990GEVSR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Motor Type - Stepper:
- Bipolar
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (8)
- Interface:
- PWM
- Technology:
- DMOS
- Step Resolution:
- -
- Applications:
- General Purpose
- Current - Output:
- 1.6A
- Voltage - Supply:
- 8V ~ 40V
- Voltage - Load:
- 8V ~ 40V
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN-EP (6x6)
A5990GEVSR-T FAQ
1.How can I place an order for A5990GEVSR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A5990GEVSR-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 A5990GEVSR-T reliable?
The price and inventory of A5990GEVSR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A5990GEVSR-T is usually 5 days.
3.What payment methods are accepted for A5990GEVSR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A5990GEVSR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A5990GEVSR-T?
A5990GEVSR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A5990GEVSR-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 A5990GEVSR-T?
For technical support, including A5990GEVSR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A5990GEVSR-T requirements.
6.How does Aetrix verify that A5990GEVSR-T is sourced from the original manufacturer or authorized distributors?
All A5990GEVSR-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 A5990GEVSR-T meets industry standards.
7.What is the process for return or replacement of A5990GEVSR-T?
All A5990GEVSR-T units undergo pre-shipment inspection (PSI). If there is an issue with A5990GEVSR-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 A5990GEVSR-T part is unused and in its original packaging.
Return procedure for A5990GEVSR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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