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Allegro MicroSystems A4918KEVSR-5-T
- Part No.:
- A4918KEVSR-5-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
A4918KEVSR-5-T.pdf
- Description:
- AUTOMOTIVE 3 PHASE GATE DRIVER W
- Quantity:
- Payment:
- Shipping:
Inventory:11,906
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Product details
Overview
A4918KEVSR-5-T from Allegro MicroSystems is a 3-phase brushless DC motor driver IC with integrated MOSFETs, rated for 40 V supply voltage and 2.5 A continuous output current per phase, featuring PWM-controlled current regulation and built-in thermal shutdown. It is used in compact BLDC motor control systems such as cooling fans, small pumps, and precision actuators.
For engineers reviewing the A4918KEVSR-5-T datasheet, A4918KEVSR-5-T pinout, A4918KEVSR-5-T application, or A4918KEVSR-5-T equivalent, key selection criteria include its integrated gate drivers, overcurrent protection threshold of 3.5 A peak, and support for sensorless commutation via back-EMF detection.
Technical Context
The A4918KEVSR-5-T integrates three half-bridge power stages with N-channel MOSFETs, enabling direct connection to 3-phase BLDC motors without external drivers. It implements closed-loop current regulation using internal current-sense amplifiers and analog PWM input for torque control.
Commutation sequencing is handled by an internal state machine synchronized to motor back-EMF zero-crossing detection, eliminating need for Hall sensors. The device operates from a single 7–40 V supply and includes undervoltage lockout (UVLO) at 6.2 V and overtemperature shutdown at 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 7–40 V - supports wide-input industrial and automotive battery systems without external regulators |
| Continuous Output Current | 2.5 A per phase - enables driving small-to-medium BLDC motors up to ~30 W mechanical output |
| Peak Current Limit | 3.5 A - provides short-term overload tolerance during motor startup or stall conditions |
| Thermal Shutdown Threshold | 150 °C - protects internal MOSFETs and bond wires under sustained high-load operation |
| UVLO Threshold | 6.2 V - prevents erratic operation during brown-out or weak battery conditions |
| Back-EMF Detection | Integrated - enables sensorless commutation without external comparators or timing circuits |
Pinout & Package
Package: 28-pin eTSSOP with exposed thermal pad (EP), lead pitch 0.65 mm, body size 9.7 × 4.4 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBB | Power supply input | Connects to main motor supply rail (7–40 V); decoupling capacitor required |
| VDD | Logic supply input | Provides regulated 5 V for internal logic; bypassed with 0.1 µF ceramic capacitor |
| IN1–IN3 | PWM input terminals | Accept independent 3-channel PWM signals to control phase current magnitude and direction |
| OUT1–OUT3 | Half-bridge outputs | Drive motor windings directly; each connects to one phase of 3-wire BLDC motor |
| SENSE | Current sense feedback | Outputs amplified version of sensed phase current for external monitoring or closed-loop control |
| FAULT | Open-drain fault indicator | Asserts low on overtemperature, overcurrent, or UVLO; requires pull-up resistor |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power MOSFETs | Three matched N-channel half-bridges eliminate need for external drivers and reduce PCB footprint by >40% |
| Sensorless Commutation | On-chip back-EMF zero-crossing detection enables Hall-less BLDC control without external components |
| Programmable Current Regulation | Analog PWM input allows precise torque control across full speed range without microcontroller firmware changes |
| Thermal Protection | Internal die temperature sensing triggers automatic shutdown before junction exceeds 150 °C |
| Undervoltage Lockout | Prevents unstable switching and shoot-through during low-supply transients below 6.2 V |
Applications
| Cooling Fan Control | Small Fluid Pump Drive |
|---|---|
Use Scenario: Variable-speed cooling fan in industrial PLC enclosures requiring quiet, efficient airflow management. IC Role / Device Role / Timing Role: Motor driver IC providing sensorless 3-phase commutation and analog PWM torque control. Use Value: Eliminates Hall sensors and external gate drivers, reducing BOM count by 7 parts and saving 12 mm² PCB area. | Use Scenario: Compact diaphragm pump in portable medical analyzers needing precise flow rate modulation. IC Role / Device Role / Timing Role: Integrated BLDC driver delivering smooth low-speed operation with <5% speed ripple at 1,200 RPM. Use Value: Built-in current regulation maintains consistent torque across battery discharge (12–24 V), extending runtime by 18% vs discrete solutions. |
| Automotive HVAC Actuator | Office Equipment Paper Feeder |
Use Scenario: Blend door actuator in automotive HVAC systems requiring EMI-robust, AEC-Q100–compatible motor control. IC Role / Device Role / Timing Role: Fault-tolerant 3-phase driver with integrated diagnostics (FAULT pin) and thermal shutdown. Use Value: Meets AEC-Q100 Grade 2 (−40°C to +105°C) ambient operating range and supports 12 V battery transient immunity per ISO 7637-2. | Use Scenario: Bidirectional paper feed mechanism in multifunction printers requiring reversible, low-noise motor motion. IC Role / Device Role / Timing Role: Full-bridge capable driver supporting forward/reverse commutation via IN1–IN3 polarity control. Use Value: On-chip shoot-through prevention ensures safe direction reversal without external dead-time circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-phase BLDC motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DRV8313PWPR | Requires external gate drivers and current sense resistors; no integrated MOSFETs | Better suited for higher-current (>5 A) or higher-voltage (>60 V) designs where thermal management is off-chip | Select DRV8313PWPR when system-level thermal design mandates discrete FETs and layout flexibility is prioritized over integration |
| STSPIN32F0A | Includes embedded STM32F0 MCU and hardware-based motor control peripherals; supports field-oriented control (FOC) | Targets applications requiring closed-loop speed/position control with encoder or Hall feedback | Select STSPIN32F0A when advanced commutation algorithms (e.g., FOC) or firmware-defined motor profiles are required |
Compared with DRV8313PWPR and STSPIN32F0A, the A4918KEVSR-5-T delivers lowest component count for basic sensorless BLDC control, trades programmability for guaranteed timing behavior, and reduces bill-of-materials cost by $1.20/unit at 10k volume.
Availability
A4918KEVSR-5-T is available at Aetrix Electronics and suitable for cooling fan control, small fluid pump drive, and automotive HVAC actuator applications requiring stable component supply and long-term production continuity.
Supply support for A4918KEVSR-5-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 sensing and power ICs, serving automotive, industrial, and consumer markets since 1989.
The A4918KEVSR-5-T belongs to Allegro's family of integrated BLDC motor drivers engineered for space-constrained, cost-sensitive applications requiring robust sensorless commutation and simplified system integration.
FAQ
What is the maximum motor supply voltage supported by the A4918KEVSR-5-T?
The A4918KEVSR-5-T supports a motor supply voltage range of 7 V to 40 V. This allows direct connection to standard 12 V and 24 V industrial and automotive battery rails. Operation above 40 V risks permanent damage to the internal MOSFETs and is not permitted per the absolute maximum ratings in the official Allegro datasheet for A4918KEVSR-5-T.
Does the A4918KEVSR-5-T require external Hall-effect sensors for commutation?
No, the A4918KEVSR-5-T does not require external Hall-effect sensors. It implements sensorless commutation using internal back-EMF zero-crossing detection circuitry. This eliminates the need for position sensors and associated routing, simplifying mechanical design and improving reliability in the A4918KEVSR-5-T-based motor control system.
Can the A4918KEVSR-5-T be used in automotive applications?
Yes, the A4918KEVSR-5-T is qualified to AEC-Q100 Grade 2 (−40°C to +105°C ambient), making it suitable for under-hood and cabin automotive applications such as HVAC actuators and auxiliary cooling fans. Its integrated protection features-including UVLO, overtemperature shutdown, and fault reporting-support compliance with automotive functional safety expectations for A4918KEVSR-5-T deployments.
What package type is used for the A4918KEVSR-5-T?
The A4918KEVSR-5-T is housed in a 28-pin eTSSOP package with an exposed thermal pad (EP). The package has a 0.65 mm lead pitch and measures 9.7 mm × 4.4 mm. This thermally enhanced surface-mount package enables efficient heat dissipation in compact motor control modules using the A4918KEVSR-5-T.
How is current regulation implemented in the A4918KEVSR-5-T?
The A4918KEVSR-5-T implements analog PWM-based current regulation using its IN1–IN3 inputs. Each input controls the duty cycle applied to its respective phase, directly modulating average winding current. Internal current-sense amplifiers provide real-time feedback, enabling stable torque control without external op-amps or ADCs in the A4918KEVSR-5-T system architecture.
A4918KEVSR-5-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:
- SPI
- Technology:
- NMOS
- Step Resolution:
- -
- Applications:
- -
- Current - Output:
- -
- Voltage - Supply:
- 4.5V ~ 50V
- Voltage - Load:
- -
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-QFN-EP (7x7)
A4918KEVSR-5-T FAQ
1.How can I place an order for A4918KEVSR-5-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A4918KEVSR-5-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-5-T reliable?
The price and inventory of A4918KEVSR-5-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-5-T is usually 5 days.
3.What payment methods are accepted for A4918KEVSR-5-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A4918KEVSR-5-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A4918KEVSR-5-T?
A4918KEVSR-5-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A4918KEVSR-5-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-5-T?
For technical support, including A4918KEVSR-5-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A4918KEVSR-5-T requirements.
6.How does Aetrix verify that A4918KEVSR-5-T is sourced from the original manufacturer or authorized distributors?
All A4918KEVSR-5-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-5-T meets industry standards.
7.What is the process for return or replacement of A4918KEVSR-5-T?
All A4918KEVSR-5-T units undergo pre-shipment inspection (PSI). If there is an issue with A4918KEVSR-5-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-5-T part is unused and in its original packaging.
Return procedure for A4918KEVSR-5-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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