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Allegro MicroSystems A4964KEVTR-J
- Part No.:
- A4964KEVTR-J
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 36-VFQFN Exposed Pad
- Datasheet:
-
A4964KEVTR-J.pdf
- Description:
- IC MOTOR DRIVER 5.5V-50V 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,850
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Product details
Overview
A4964KEVTR-J from Allegro MicroSystems is a three-phase, sensorless, brushless DC (BLDC) motor controller IC designed for automotive fuel, oil, and urea pumps. It drives external N-channel MOSFETs using sinusoidal commutation, supports 5.5–50 V supply, integrates LIN/PWM physical interface with wake capability, and provides MCU watchdog/reset, diagnostics, and programmable gate drive slew rate control.
For engineers reviewing the A4964KEVTR-J datasheet, A4964KEVTR-J pinout, A4964KEVTR-J application, or A4964KEVTR-J equivalent, this page delivers verified technical context, real-world automotive use cases, SPI- and PWM-controllable motor modes (voltage, current, speed), integrated fault protection (VBB undervoltage, overtemperature, VDS monitoring), and thermal-aware package specifications for production-grade design-in.
Technical Context
The A4964KEVTR-J implements sensorless rotor position estimation via back-EMF zero-crossing detection across all three phases, enabling closed-loop sinusoidal drive without Hall sensors or encoders. Its commutation logic includes programmable BEMF window (1.4–60° electrical), windmill detection, and phase advance tuning (0–60° electrical) to optimize torque and efficiency across load variations.
It features dual-mode operation: SPI-configurable mode for microcontroller-coordinated systems and stand-alone mode with LIN/PWM input for direct motor control. Integrated regulators supply 3.3/5.0 V logic (VLR), 7.5–11.7 V gate drive (VREG), and bootstrap charge management - all with undervoltage lockout, thermal shutdown (175°C), and diagnostic register reporting via SDO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5.5 V to 50 V - supports full automotive battery range including cold-crank (6 V) and load-dump (40+ V) transients. |
| Motor Drive Architecture | Sensorless 3-phase sinusoidal PWM - eliminates need for position sensors while enabling smooth torque and low acoustic noise. |
| Control Interface | SPI-compatible serial interface + LIN/PWM physical layer - enables ECU integration or standalone operation with wake-up capability. |
| Current Sensing | Single differential sense amplifier with 25–200 mV programmable threshold - provides peak current limiting and average current readback via SPI. |
| Thermal Performance | RθJA = 27 °C/W (4-layer PCB) - validated for under-hood automotive environments up to 150 °C ambient. |
| Fault Protection | Integrated VBB undervoltage (4.3 V ON), overtemperature (175 °C trip), VDS short-circuit detection, and bootstrap UV - reduces external protection circuitry. |
| Package | 36-terminal eQFN (6 mm × 6 mm, 1.0 mm max height, wettable flank) - optimized for automated optical inspection and thermal reliability in high-vibration applications. |
Pinout & Package
The A4964KEVTR-J is housed in a 36-terminal exposed-pad QFN (suffix EV), thermally optimized for automotive under-hood mounting. The exposed thermal pad must be soldered to a GND plane for effective heat dissipation and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CA, CB, CC | Phase A/B/C Bootstrap Capacitor Terminals | Connect external bootstrap capacitors to sustain high-side gate drive voltage during 100% duty cycle operation. |
| GHA, GHB, GHC | High-Side Gate Drive Outputs | Drive N-channel MOSFET gates with programmable slew rate and 7 Ω typical RDS(on) pull-up at 25°C. |
| GLA, GLB, GLC | Low-Side Gate Drive Outputs | Provide 3 Ω typical RDS(on) pull-down at 25°C for fast, controlled low-side switching and dead-time management. |
| SA, SB, SC | Motor Phase Terminals | Direct connection points to motor windings; support phase voltage sensing and VDS fault monitoring via VBRG. |
| CSP, CSM | Current Sense Amplifier Inputs | Differential inputs for shunt-based current measurement; enable closed-loop torque control and overcurrent protection. |
| VBB, VREG, VLR | Power Supply Terminals | VBB: main battery input (5.5–50 V); VREG: regulated gate drive supply (7.5–11.7 V); VLR: logic regulator output (3.3/5.0 V). |
| STRn, SCK, SDI, SDO | SPI Interface Signals | Standard 4-wire SPI interface with strobe (chip select), clock, data-in, and tri-state data-out for configuration and status readback. |
| LIN, LTX, LRX | LIN Bus Physical Layer | Supports LIN 2.2A compliance with wake-up capability; LTX drives bus, LRX receives, LIN connects to twisted-pair network. |
| IG, WDOG, MRSTn, DIAG | System Control & Diagnostics | IG: ignition switch interface; WDOG: MCU watchdog input; MRSTn: open-drain reset output; DIAG: programmable fault indicator (10 mA sink). |
Key Features
| Feature | Design Value |
|---|---|
| Sensorless Sinusoidal Commutation | Enables smooth, low-noise BLDC operation without position sensors - reduces system cost and improves reliability in harsh environments. |
| Windmill Detection & Pre-Rotation Sync | Allows safe restart of rotating motors (e.g., cooling fans after engine stop) by detecting direction and synchronizing commutation before applying torque. |
| Programmable Gate Drive Slew Rate | Configurable turn-on/turn-off currents (±5 to ±75 mA) reduce EMI and prevent shoot-through while maintaining efficiency. |
| Integrated Diagnostics Register | Serial-accessible register reports real-time faults (VBB UV, overtemp, VDS short, loss of sync) - simplifies ECU-level error handling and logging. |
| Bootstrap Undervoltage Monitoring | Monitors VCX–VSX differential to detect bootstrap capacitor discharge - prevents high-side FET failure during sustained high-duty cycles. |
Applications
| Automotive Fuel Pumps | Engine Cooling Fans |
|---|---|
Use Scenario: High-reliability, variable-speed fuel delivery in gasoline/diesel direct-injection systems operating across -40°C to 150°C ambient. IC Role / Device Role / Timing Role: Primary motor controller managing sinusoidal phase currents, closed-loop speed regulation, and LIN-based ECU commands. Use Value: Enables precise fuel metering and pressure control while meeting ASIL-B functional safety requirements via integrated diagnostics and watchdog. | Use Scenario: PWM-controlled radiator fan in ICE and hybrid powertrains, requiring quiet operation and rapid response to coolant temperature changes. IC Role / Device Role / Timing Role: Stand-alone BLDC driver accepting LIN commands or analog PWM input; performs sensorless startup and soft acceleration. Use Value: Reduces acoustic noise by >10 dB vs trapezoidal drive and eliminates Hall sensor failure modes in high-temperature zones near exhaust manifolds. |
| Urea Dosing Pumps (SCR Systems) | Electric Power Steering Assist Pumps |
Use Scenario: Precise dosing of aqueous urea solution into diesel exhaust streams to meet Euro 6/US Tier 3 NOx limits. IC Role / Device Role / Timing Role: Motor controller with current-mode torque limiting and diagnostic feedback for pump stall detection and fluid flow verification. Use Value: Ensures accurate dosing across wide temperature ranges (-40°C to +125°C) and prevents crystallization-induced motor stalling via windmill restart capability. | Use Scenario: Compact, high-torque hydraulic assist pump in 12 V EPS systems where space, weight, and EMI are critical constraints. IC Role / Device Role / Timing Role: Three-phase gate driver with integrated VLR/VREG regulators and fault-safe shutdown - replaces discrete LDOs and external supervisors. Use Value: Reduces BOM count by 7 components and meets CISPR 25 Class 5 EMI limits through programmable slew-rate control and bootstrap management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar three-phase sensorless BLDC motor controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP6532GQ-Z | Integrated 3-phase gate drivers only - no LIN interface, no VLR/VREG regulators, no diagnostics register; requires external MCU for commutation logic. | Best suited for cost-sensitive industrial fans where ECU coordination and automotive diagnostics are unnecessary. | Select when full system integration is handled externally and thermal footprint is less constrained (QFN-24 vs QFN-36). |
| DRV3205-Q1 | Includes integrated current sense amplifiers and SPI interface but lacks LIN physical layer, windmill detection, and programmable BEMF window tuning. | Targeted at electric power steering and HVAC blowers where LIN is not required and startup robustness is less critical than peak efficiency. | Choose when ASIL-B compliance is not mandated and diagnostic depth is secondary to conduction loss minimization. |
Compared with MP6532GQ-Z and DRV3205-Q1, the A4964KEVTR-J uniquely combines automotive-grade LIN wake-up, sensorless windmill restart, and on-chip diagnostics register - making it the only option qualified for urea dosing and fuel pump applications requiring ISO 16750-2 transient immunity and ISO 26262 ASIL-B support.
Availability
A4964KEVTR-J is available at Aetrix Electronics and suitable for automotive fuel pumps, engine cooling fans, and urea dosing systems requiring stable component supply, AEC-Q100 Grade 0 qualification, and long-term lifecycle continuity.
Supply support for A4964KEVTR-J 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 global leader in precision motion-sensing and power ICs, headquartered in Manchester, NH, with deep expertise in automotive-grade magnetic sensing, motor control, and high-voltage interface solutions.
The A4964 product line was engineered specifically for automotive BLDC motor control in safety-critical fluid-handling systems - emphasizing robustness against battery transients, thermal resilience, and seamless integration with vehicle communication networks (LIN).
FAQ
What is the primary function of the A4964KEVTR-J in an automotive system?
The A4964KEVTR-J serves as a three-phase, sensorless BLDC motor controller IC that manages motor commutation, gate drive, diagnostics, and system supervision for automotive fluid pumps and fans. It executes sinusoidal drive using back-EMF sensing, supports both SPI-configured and LIN/PWM stand-alone operation, and integrates regulators (VLR, VREG), watchdog, and fault reporting - eliminating the need for external supervisors or interface transceivers in compliant designs.
Does the A4964KEVTR-J require external position sensors for motor control?
No, the A4964KEVTR-J does not require external position sensors. It uses sensorless commutation based on real-time monitoring of motor back-EMF zero crossings across all three phases. This enables reliable startup (including windmill detection and synchronization), continuous rotation, and closed-loop speed control without Hall-effect sensors or encoders - reducing system cost and improving reliability in harsh under-hood environments.
What package type and thermal characteristics apply to the A4964KEVTR-J?
The A4964KEVTR-J uses a 36-terminal exposed-pad QFN package (6 mm × 6 mm, 1.0 mm max height, wettable flank). Its thermal resistance is RθJA = 27 °C/W on a 4-layer JEDEC-standard PCB. The exposed thermal pad must be soldered to a solid GND plane to achieve rated performance and ensure operation across –40°C to +150°C ambient temperatures per AEC-Q100 Grade 0 requirements.
How does the A4964KEVTR-J handle fault conditions such as overtemperature or short circuits?
The A4964KEVTR-J includes integrated fault protection: overtemperature shutdown triggers at 175°C (with 15°C hysteresis), VBB undervoltage locks out below 4.3 V, and VDS monitoring detects MOSFET short circuits using configurable thresholds (1400–3150 mV) and blanking time (0.6–3.15 µs). Faults are reported via the DIAG pin and serial diagnostic register, enabling immediate ECU response or safe shutdown without external circuitry.
Can the A4964KEVTR-J operate without a microcontroller?
Yes, the A4964KEVTR-J can operate as a stand-alone motor controller using its integrated LIN or PWM physical interface. In stand-alone mode, it accepts speed commands directly via LIN messages or analog PWM input, executes sensorless startup and run control, and provides diagnostic feedback - eliminating the need for an external MCU in simpler automotive subsystems like auxiliary cooling fans or cabin blowers.
A4964KEVTR-J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 36-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Controller - Commutation, Direction Management
- Output Configuration:
- -
- Interface:
- SPI
- Technology:
- -
- Step Resolution:
- -
- Applications:
- -
- Current - Output:
- -
- Voltage - Supply:
- 5.5V ~ 50V
- Voltage - Load:
- -
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (6x6)
A4964KEVTR-J FAQ
1.How can I place an order for A4964KEVTR-J through Aetrix?
Please submit a Request for Quotation (RFQ) for A4964KEVTR-J 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 A4964KEVTR-J reliable?
The price and inventory of A4964KEVTR-J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A4964KEVTR-J is usually 5 days.
3.What payment methods are accepted for A4964KEVTR-J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A4964KEVTR-J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A4964KEVTR-J?
A4964KEVTR-J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A4964KEVTR-J 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 A4964KEVTR-J?
For technical support, including A4964KEVTR-J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A4964KEVTR-J requirements.
6.How does Aetrix verify that A4964KEVTR-J is sourced from the original manufacturer or authorized distributors?
All A4964KEVTR-J 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 A4964KEVTR-J meets industry standards.
7.What is the process for return or replacement of A4964KEVTR-J?
All A4964KEVTR-J units undergo pre-shipment inspection (PSI). If there is an issue with A4964KEVTR-J, 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 A4964KEVTR-J part is unused and in its original packaging.
Return procedure for A4964KEVTR-J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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