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Allegro MicroSystems A4918KJPTR-1A-3-T
- Part No.:
- A4918KJPTR-1A-3-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 48-LQFP Exposed Pad
- Datasheet:
-
A4918KJPTR-1A-3-T.pdf
- Description:
- AUTOMOTIVE 3 PHASE GATE DRIVER W
- Quantity:
- Payment:
- Shipping:
Inventory:3,867
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Product details
Overview
A4918KJPTR-1A-3-T from Allegro MicroSystems is an automotive-grade 3-phase N-channel MOSFET driver IC designed for BLDC motor control in high-power inductive loads. It operates from 4.5 V to 50 V, integrates a charge pump for gate drive down to 7 V battery input, supports programmable gate drive voltage/strength, and features SPI-compatible serial interface and AEC-Q100 qualification.
For engineers reviewing the A4918KJPTR-1A-3-T datasheet, A4918KJPTR-1A-3-T pinout, A4918KJPTR-1A-3-T application, or A4918KJPTR-1A-3-T equivalent, key selection criteria include 48-pin QFP package with exposed thermal pad, 3.3 V logic I/O compatibility, programmable dead time and diagnostics, and safety-assist features for ASIL-B–capable systems.
Technical Context
The A4918KJPTR-1A-3-T implements full six-MOSFET control of a 3-phase bridge using direct logic inputs or SPI register access. Its dual charge pump architecture-main regulator + top-off pump-enables continuous 100% PWM operation while maintaining gate drive above battery voltage even at low VBAT (≥7 V).
Integrated crossover protection prevents shoot-through via hardware-enforced dead time, configurable via serial interface. Three programmable current sense amplifiers feed real-time phase current data to external controllers, and diagnostics-including short-circuit, overtemperature, and undervoltage detection-are fully configurable and verifiable via SPI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 50 V - supports wide automotive battery transients and cold-crank operation |
| Logic I/O Voltage | 3.3 V - compatible with standard automotive microcontrollers without level-shifting |
| Package | 48-pin LQFP with exposed thermal pad - enables high-power thermal dissipation in constrained layouts |
| Gate Drive Architecture | N-channel bootstrap + auxiliary charge pump - sustains high-side gate drive during 100% duty cycle |
| Interface | SPI-compatible serial interface - allows dynamic configuration and diagnostic readback |
| Safety Certification | AEC-Q100 Grade 1, ASIL-B capable (A2-SIL™) - validated for automotive safety-critical motor control |
| Current Sense | Three independent programmable amplifiers - provides scalable, noise-immune phase current monitoring |
Pinout & Package
The A4918KJPTR-1A-3-T is housed in a 48-lead LQFP package (7 mm × 7 mm, 1.6 mm height) with exposed thermal pad for enhanced thermal performance. Pin 1 is marked by a corner notch or dot; the package complies with IPC-7351 QFP50P900X900X160-48M land pattern guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBB | High-side gate drive supply | Input for bootstrap capacitor charging; referenced to PHASE node |
| VCP | Charge pump output | Provides boosted voltage for high-side gate drive when VBAT drops below 7 V |
| PHASE_A/B/C | Half-bridge output terminals | Connect directly to motor phase windings; rated for 65 V max blocking voltage |
| IN_AH/AL, IN_BH/BL, IN_CH/CL | Bridge control inputs | Direct logic-level inputs for six-MOSFET commutation (block or sinusoidal) |
| STRn | Serial interface strobe | Active-high signal enabling SPI register access; internal pull-up per Rev. 2 datasheet |
| DIAG | Diagnostics output | Open-drain fault indicator with temperature-compensated threshold (−40°C to 150°C) |
| CSA/CSB/CSC | Current sense amplifier outputs | Analog outputs scaled to 1 V/A; each independently programmable gain and offset |
| VM | Power MOSFET source reference | Low-side current return path; connects to motor winding center-tap or shunt ground |
Key Features
| Feature | Design Value |
|---|---|
| Programmable gate drive strength | Adjusts slew rate to reduce EMI emissions without compromising switching speed |
| Configurable dead time | Prevents shoot-through across all three half-bridges via SPI register or hardware pins |
| Top-off charge pump | Maintains bootstrap capacitor charge during sustained high-side conduction (100% PWM) |
| Verifiable diagnostics | Diagnostic registers and self-test modes confirm fault detection integrity under host MCU control |
| Thermal-enhanced QFP | Exposed thermal pad enables >2.5 W power dissipation at TA = 105°C with 4 thermal vias |
Applications
| Electric Power Steering (EPS) | Automotive HVAC Blower |
|---|---|
Use Scenario: High-reliability 3-phase BLDC motor control in column-assist EPS systems requiring ASIL-B compliance. IC Role / Device Role / Timing Role: Primary gate driver managing six external N-channel MOSFETs in inverter stage; handles commutation timing and fault response. Use Value: Integrated diagnostics and programmable dead time reduce system-level validation effort and improve functional safety certification readiness. | Use Scenario: Compact, thermally constrained blower motor drive in vehicle cabin HVAC modules. IC Role / Device Role / Timing Role: Bridge controller interfacing with 32-bit automotive MCU via SPI; manages PWM timing and current feedback scaling. Use Value: 3.3 V logic compatibility eliminates level shifters; exposed thermal pad enables 100% PWM operation in sealed enclosures. |
| Onboard Charger (OBC) Cooling Fan | 48 V Mild Hybrid Starter-Generator |
Use Scenario: High-efficiency cooling fan for liquid-cooled OBC inverters operating across 12 V–48 V battery domains. IC Role / Device Role / Timing Role: Gate driver supporting variable-speed control with integrated current sensing for closed-loop torque regulation. Use Value: Wide 4.5–50 V supply range accommodates both 12 V auxiliary and 48 V main bus inputs without external regulators. | Use Scenario: Starter-generator in-cylinder assist motor control for 48 V P0/P1 mild hybrid architectures. IC Role / Device Role / Timing Role: Safety-monitored 3-phase driver executing field-oriented control (FOC) commutation sequences. Use Value: A2-SIL™ features and diagnostic verification support ISO 26262 ASIL-B decomposition requirements for hybrid powertrain subsystems. |
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 |
|---|---|---|---|
| MP6543GQ-P | 40 V max VDD, integrated MOSFETs (not external), no charge pump, 5 V logic only | Targeted at lower-power fans/pumps; not suitable for high-voltage BLDC or ASIL-B systems | Select when board space is critical and external FETs are unnecessary |
| STSPIN32F0601 | Integrated 650 V 3-phase inverter + ARM Cortex-M0, 3.3 V logic, no AEC-Q100 or ASIL-B certification | Designed for cost-sensitive industrial BLDC drives; lacks automotive safety documentation | Select when embedded control and gate drive integration outweigh safety certification needs |
Compared with MP6543GQ-P and STSPIN32F0601, the A4918KJPTR-1A-3-T uniquely combines external N-FET flexibility, AEC-Q100 Grade 1 operation, ASIL-B–ready diagnostics, and dual charge pump support for 100% PWM-making it the only option qualified for safety-critical automotive traction and steering applications.
Availability
A4918KJPTR-1A-3-T is available at Aetrix Electronics and suitable for electric power steering, HVAC blower, and onboard charger cooling systems requiring stable component supply, automotive qualification, and long-term lifecycle support.
Supply support for A4918KJPTR-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, headquartered in Manchester, NH, with global manufacturing and test facilities.
The A4918 product line delivers robust, safety-certified 3-phase gate drivers for automotive BLDC motor control, emphasizing fault resilience, thermal efficiency, and seamless integration with automotive microcontrollers.
FAQ
What is the maximum operating voltage for the A4918KJPTR-1A-3-T?
The A4918KJPTR-1A-3-T supports a supply voltage range of 4.5 V to 50 V. This wide range enables reliable operation during automotive cold-crank events (down to 4.5 V) and transient load-dump conditions (up to 50 V), making it suitable for 12 V and 48 V vehicle electrical architectures. The device maintains full functionality-including gate drive and diagnostics-across this entire range.
Does the A4918KJPTR-1A-3-T require external bootstrap capacitors?
Yes, the A4918KJPTR-1A-3-T requires external bootstrap capacitors on each high-side gate drive path (VBB pins). These capacitors are charged via internal diodes from the PHASE nodes and maintained by the auxiliary top-off charge pump. The datasheet specifies 100 nF ceramic capacitors with X7R dielectric and low-ESR layout for optimal performance and stability.
Is the A4918KJPTR-1A-3-T pin-compatible with other A4918 variants?
No, the A4918KJPTR-1A-3-T is not pin-compatible with A4918KEVSR-1A-x-T (QFN) variants due to differing package footprints-LQFP vs. QFN-and distinct thermal pad geometries. While both share identical pin functions and register maps, PCB layout must be redesigned to accommodate the 48-pin QFP mechanical outline, land pattern, and solder stencil specifications defined in Allegro DWG-0000386.
What safety certifications apply to the A4918KJPTR-1A-3-T?
The A4918KJPTR-1A-3-T is AEC-Q100 Grade 1 qualified (−40°C to +125°C ambient) and designated as an A2-SIL™ device, indicating built-in features aligned with ISO 26262 ASIL-B requirements. It includes diagnostic verification capability, redundant fault detection paths, and failure mode coverage reporting via its SPI interface-all documented in the A4918-1A-DS Rev. 2 datasheet.
Can the A4918KJPTR-1A-3-T operate without the serial interface?
Yes, the A4918KJPTR-1A-3-T supports standalone operation using direct logic inputs (IN_AH/AL, IN_BH/BL, IN_CH/CL) for block commutation. The serial interface is optional and used only for advanced configuration-such as dead time tuning, current sense calibration, or diagnostic enablement. All default settings are functional at power-up without SPI initialization.
A4918KJPTR-1A-3-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 48-LQFP 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 ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP-EP (7x7)
A4918KJPTR-1A-3-T FAQ
1.How can I place an order for A4918KJPTR-1A-3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A4918KJPTR-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 A4918KJPTR-1A-3-T reliable?
The price and inventory of A4918KJPTR-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 A4918KJPTR-1A-3-T is usually 5 days.
3.What payment methods are accepted for A4918KJPTR-1A-3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A4918KJPTR-1A-3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A4918KJPTR-1A-3-T?
A4918KJPTR-1A-3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A4918KJPTR-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 A4918KJPTR-1A-3-T?
For technical support, including A4918KJPTR-1A-3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A4918KJPTR-1A-3-T requirements.
6.How does Aetrix verify that A4918KJPTR-1A-3-T is sourced from the original manufacturer or authorized distributors?
All A4918KJPTR-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 A4918KJPTR-1A-3-T meets industry standards.
7.What is the process for return or replacement of A4918KJPTR-1A-3-T?
All A4918KJPTR-1A-3-T units undergo pre-shipment inspection (PSI). If there is an issue with A4918KJPTR-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 A4918KJPTR-1A-3-T part is unused and in its original packaging.
Return procedure for A4918KJPTR-1A-3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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