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Allegro MicroSystems A4918KEVSR-1A-3-T
- Part No.:
- A4918KEVSR-1A-3-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
A4918KEVSR-1A-3-T.pdf
- Description:
- AUTOMOTIVE 3 PHASE GATE DRIVER W
- Quantity:
- Payment:
- Shipping:
Inventory:2,639
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Product details
Overview
A4918KEVSR-1A-3-T from Allegro MicroSystems is a 3-phase N-channel MOSFET gate driver IC designed for automotive BLDC motor control, featuring 4.5–50 V supply operation, programmable gate drive voltage/strength, integrated crossover protection with adjustable dead time, and SPI-compatible serial interface for diagnostics and configuration.
For engineers reviewing the A4918KEVSR-1A-3-T datasheet, A4918KEVSR-1A-3-T pinout, A4918KEVSR-1A-3-T application, or A4918KEVSR-1A-3-T equivalent, this device supports block or sinusoidal commutation in safety-critical automotive systems requiring AEC-Q100 qualification, diagnostic verification, and robust shoot-through prevention under low-voltage battery conditions down to 7 V.
Technical Context
The A4918KEVSR-1A-3-T implements a dual-charge-pump architecture: one supplies gate drive above battery voltage for bootstrap operation, while a top-off charge pump maintains bootstrap capacitor charge during 100% PWM duty cycles. It integrates three current-sense amplifiers with programmable gain for phase current monitoring.
Control is supported via direct logic inputs or SPI interface, enabling full six-MOSFET bridge control with configurable dead time (programmable via register), diagnostic reporting (fault flags, temperature, overcurrent), and safety-assist features including diagnostic verification mode compliant with A2-SIL™ requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 50 V - enables direct connection to automotive battery rails including cold-crank (7 V min) and load-dump transients. |
| Logic I/O Voltage | 3.3 V - compatible with standard automotive microcontrollers and DSPs without level-shifting. |
| Output Configuration | Six independent high-side/low-side drivers - supports full 3-phase bridge control with block or sinusoidal excitation. |
| Gate Drive Strength | Programmable sink/source current - reduces EMI by limiting dV/dt during switching transitions. |
| Diagnostic Interface | SPI-compatible serial interface - allows real-time readback of fault registers, temperature, and current sense data. |
| Safety Certification | AEC-Q100 Grade 1 & A2-SIL™ - validated for automotive powertrain and chassis applications requiring functional safety support. |
| Current Sense | Three integrated amplifiers - provides per-phase current feedback with programmable gain for closed-loop motor control. |
Pinout & Package
The A4918KEVSR-1A-3-T is housed in a 7 mm × 7 mm, 0.9 mm nominal height 48-terminal QFN package with exposed thermal pad and wettable flank (EV suffix), optimized for automated optical inspection and thermal performance in high-power automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBB | High-side gate drive supply | Input for bootstrap capacitor charging; powers high-side drivers above battery voltage. |
| VCP | Charge pump output | Provides regulated voltage to sustain gate drive during extended high-side conduction. |
| INx / OUTx (x=1–6) | Bridge control inputs / gate outputs | Direct logic-level inputs or SPI-configured outputs driving six external N-channel MOSFETs. |
| CSx (x=1–3) | Current sense amplifier inputs | Differential inputs for shunt-based phase current measurement with internal gain programming. |
| DIAG | Diagnostic flag output | Open-drain fault indicator signaling overtemperature, overcurrent, or bridge faults. |
| SDI / SDO / SCLK / CSn | SPI interface signals | Serial interface pins enabling configuration, register readback, and diagnostic verification. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable dead time | Adjustable via SPI register to prevent shoot-through across complementary MOSFET pairs in 3-phase bridge. |
| Top-off charge pump | Maintains bootstrap capacitor charge during 100% PWM duty cycle, enabling continuous high-side drive. |
| Integrated logic supply | On-chip LDO generates stable 3.3 V rail for internal logic and interface circuits from main supply. |
| Diagnostic verification mode | Allows system-level validation of diagnostic functionality under host controller command per ISO 26262 requirements. |
| Wettable flank QFN | Enables automated optical inspection (AOI) of solder joints on bottom leads for automotive-grade manufacturing traceability. |
Applications
| Electric Power Steering (EPS) | Automotive HVAC Blower |
|---|---|
Use Scenario: High-reliability 3-phase BLDC motor control in steering assist systems requiring fail-safe torque management and thermal monitoring. IC Role / Device Role / Timing Role: Gate driver providing synchronized six-FET control with programmable dead time and real-time current sensing per phase. Use Value: Enables precise torque response and ASIL-B-compliant diagnostics via SPI-readback fault registers and diagnostic verification mode. | Use Scenario: Compact, thermally efficient blower motor drive in passenger cabin HVAC systems operating across wide battery voltage range. IC Role / Device Role / Timing Role: N-channel bridge driver with integrated charge pump supporting cold-crank operation down to 7 V battery input. Use Value: Eliminates need for external high-side drivers or discrete charge pump circuitry, reducing BOM count and PCB area. |
| Electric Brake Actuators | Onboard Charger Cooling Fans |
Use Scenario: Safety-critical actuation in electro-mechanical brake systems demanding AEC-Q100 Grade 1 and diagnostic coverage. IC Role / Device Role / Timing Role: Fault-tolerant gate driver with integrated overcurrent detection, thermal shutdown, and SPI-accessible diagnostic status. Use Value: Supports ISO 26262 FMEDA analysis through configurable diagnostic verification and multiple fault flagging channels. | Use Scenario: High-duty-cycle cooling fan control in EV onboard chargers where thermal management must remain active during extended charging sessions. IC Role / Device Role / Timing Role: Three-phase driver with top-off charge pump ensuring reliable high-side FET conduction at 100% duty cycle. Use Value: Prevents bootstrap capacitor discharge-induced gate drive collapse, maintaining continuous fan rotation without speed droop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-phase MOSFET driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP6550GQ-Z | 40 V max supply, no integrated current sense amps, no diagnostic verification mode, QFN-40 package | Lacks AEC-Q100 qualification and functional safety features; suited for non-automotive industrial BLDC drives | Select when cost-sensitive non-automotive designs require basic 3-phase drive without safety certification. |
| STSPIN32F0A | Integrated 32-bit ARM Cortex-M0 MCU, 200 V 3-phase gate driver, no top-off charge pump, TQFP-48 | Combines MCU + driver in single package; lacks A2-SIL™ features and diagnostic verification capability | Select when embedded motor control firmware execution is required on-chip, accepting trade-offs in safety feature depth. |
Compared with MP6550GQ-Z and STSPIN32F0A, the A4918KEVSR-1A-3-T delivers automotive-grade reliability via AEC-Q100 Grade 1, A2-SIL™ safety features, and diagnostic verification - critical for EPS and brake actuator systems where fault detection integrity is mandated.
Availability
A4918KEVSR-1A-3-T is available at Aetrix Electronics and suitable for electric power steering, HVAC blower control, and brake actuator systems requiring stable component supply, automotive qualification, and long-term lifecycle support.
Supply support for A4918KEVSR-1A-3-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 and manufacturer of high-performance magnetic sensors and power ICs, specializing in motion control and energy-efficient solutions for automotive and industrial markets.
The A4918 product line delivers automotive-qualified 3-phase gate drivers with integrated safety, diagnostics, and charge pump technology - engineered specifically for BLDC motor control in safety-critical vehicle subsystems.
FAQ
What is the minimum operating supply voltage for the A4918KEVSR-1A-3-T?
The A4918KEVSR-1A-3-T operates down to 4.5 V supply voltage, with its unique charge pump regulator sustaining gate drive functionality even when battery voltage drops to 7 V. This ensures reliable startup and operation during automotive cold-crank conditions. The device maintains full diagnostic and communication capability across its entire 4.5–50 V range, making it suitable for 12 V and 48 V vehicle architectures alike.
Does the A4918KEVSR-1A-3-T support 100% PWM duty cycle for high-side MOSFETs?
Yes, the A4918KEVSR-1A-3-T supports continuous high-side conduction via its dedicated top-off charge pump, which replenishes the bootstrap capacitor during sustained on-states. This eliminates gate drive collapse in applications like HVAC blowers or brake cooling fans requiring uninterrupted rotation. The top-off function is enabled automatically and does not require external components or configuration.
How is diagnostic functionality verified on the A4918KEVSR-1A-3-T?
The A4918KEVSR-1A-3-T includes a diagnostic verification mode accessible via its SPI interface, allowing host controllers to trigger and confirm correct operation of internal fault detection circuits - including overtemperature, overcurrent, and bridge faults - per ISO 26262 requirements. This mode is essential for ASIL-B system integration and is distinct from standard diagnostic flag reporting.
What package type does the A4918KEVSR-1A-3-T use, and why is it significant?
The A4918KEVSR-1A-3-T uses a 48-terminal wettable flank QFN (EV package) with exposed thermal pad. The wettable flank design enables automated optical inspection of solder joints, improving manufacturing yield and traceability in automotive production. Its 7 mm × 7 mm footprint and low 0.9 mm profile support compact, thermally efficient layouts in space-constrained modules such as EPS ECUs.
Can the A4918KEVSR-1A-3-T be used with both 3.3 V and 5 V logic systems?
The A4918KEVSR-1A-3-T variant specified here (suffix -3-T) is configured for 3.3 V logic I/O compatibility, as indicated in the selection guide. While other variants (e.g., A4918KEVSR-1A-5-T) support 5 V logic, this specific part requires 3.3 V input levels and generates 3.3 V-compatible outputs. Mixing logic voltages without level translation may cause interface failure or damage.
A4918KEVSR-1A-3-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Motor Type - Stepper:
- Multiphase
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (3)
- Interface:
- I2C, SPI
- Technology:
- NMOS
- Step Resolution:
- -
- Applications:
- -
- Current - Output:
- -
- Voltage - Supply:
- 4.5V ~ 50V
- Voltage - Load:
- 4.5V ~ 50V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 48-QFN (7x7)
A4918KEVSR-1A-3-T FAQ
1.How can I place an order for A4918KEVSR-1A-3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A4918KEVSR-1A-3-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 A4918KEVSR-1A-3-T reliable?
The price and inventory of A4918KEVSR-1A-3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A4918KEVSR-1A-3-T is usually 5 days.
3.What payment methods are accepted for A4918KEVSR-1A-3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A4918KEVSR-1A-3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A4918KEVSR-1A-3-T?
A4918KEVSR-1A-3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A4918KEVSR-1A-3-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 A4918KEVSR-1A-3-T?
For technical support, including A4918KEVSR-1A-3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A4918KEVSR-1A-3-T requirements.
6.How does Aetrix verify that A4918KEVSR-1A-3-T is sourced from the original manufacturer or authorized distributors?
All A4918KEVSR-1A-3-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 A4918KEVSR-1A-3-T meets industry standards.
7.What is the process for return or replacement of A4918KEVSR-1A-3-T?
All A4918KEVSR-1A-3-T units undergo pre-shipment inspection (PSI). If there is an issue with A4918KEVSR-1A-3-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 A4918KEVSR-1A-3-T part is unused and in its original packaging.
Return procedure for A4918KEVSR-1A-3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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