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Allegro MicroSystems AMT49105KEVTR-J
- Part No.:
- AMT49105KEVTR-J
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
AMT49105KEVTR-J.pdf
- Description:
- BLDC SYSTEM BASIS IC W/PARALLEL
- Quantity:
- Payment:
- Shipping:
Inventory:2,359
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Product details
Overview
AMT49105KEVTR-J from Allegro MicroSystems is a three-phase N-channel MOSFET driver IC designed for automotive BLDC motor control in high-power inductive loads. It provides full six-FET bridge control, integrated LIN/PWM physical interface (ISO 17987/SAE J2602 compliant), programmable dead time (0.1–3.15 µs), and ASIL A safety element out-of-context (SEooC) compliance per ISO 26262.
For engineers reviewing the AMT49105KEVTR-J datasheet, AMT49105KEVTR-J pinout, AMT49105KEVTR-J application, or AMT49105KEVTR-J equivalent, key selection considerations include bootstrap gate drive operation down to 5.5 V, integrated current sense amplifier with programmable gain/offset, SPI-compatible serial interface, and diagnostic coverage for undervoltage, overtemperature, and bridge faults.
Technical Context
The AMT49105KEVTR-J integrates a charge pump regulator enabling gate drive supply generation from battery voltages as low as 5.5 V, paired with bootstrap capacitors (CA/CB/CC) for high-side N-MOSFET biasing. Its gate drive architecture supports both direct logic input and SPI-controlled commutation modes - block or sinusoidal - with cross-conduction protection via adjustable dead time.
It embeds a LIN/PWM transceiver with wake capability, MCU watchdog/reset supervision (programmable window: 1–63 ms), and diagnostics including VBB/VREG/VLR undervoltage monitors, chip-level overtemperature detection (165°C max junction), and bridge fault reporting (overcurrent, bootstrap UV, VDS overvoltage). The current sense amplifier uses a single low-side shunt with ±2 mV offset and 20 V/V default gain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBB Operating Range | 5.5 V to 50 V - enables direct connection to automotive battery rails including cold-crank (5.5 V) and load-dump (50 V) conditions. |
| Gate Drive Output Strength | High-side pull-up: 5–11 Ω (25°C); low-side pull-down: 1.5–3.1 Ω (25°C) - ensures fast switching of typical 10 nF gate loads with <200 ns turn-on/turn-off times. |
| Dead Time Programmability | 0.1 µs to 3.15 µs - prevents shoot-through in three-phase bridges while supporting variable PWM frequencies and motor speeds. |
| Current Sense Accuracy | ±2 mV input offset, ±1.6% gain error, 2 MHz bandwidth - delivers precise phase current measurement for closed-loop torque control using low-value shunts. |
| LIN/PWM Interface | ISO 17987 & SAE J2602 compliant; supports wake-up from sleep state with <160 µs bus dominant pulse - meets automotive communication requirements without external transceiver. |
| Thermal Resistance | RθJA = 24 °C/W (4-layer PCB) - enables sustained operation at 150°C ambient when properly heatsinked via exposed thermal pad. |
| Safety Certification | ASIL A SEooC per ISO 26262 - validated for use in safety-related systems when implemented per manufacturer's safety manual. |
Pinout & Package
AMT49105KEVTR-J is supplied in a 48-terminal wettable flank QFN package (7 mm × 7 mm, 0.9 mm height) with exposed thermal pad (suffix EV), Pb-free with 100% matte-tin leadframe plating. This package supports automated optical inspection (AOI) and improves thermal performance via direct PCB copper contact.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GHA, GHB, GHC | High-side gate drive outputs | Drive N-MOSFET gates in phases A/B/C using bootstrap-supplied voltage (VCx); each includes passive pull-down (4–10 kΩ) for safe shutdown. |
| GLA, GLB, GLC | Low-side gate drive outputs | Directly sourced from VREG-regulated supply; sink up to 1.33 A peak for fast low-side turn-off in high-current motor phases. |
| CA, CB, CC | Bootstrap capacitor connections | Provide floating supply for high-side drivers; internal bootstrap diodes (Vf = 0.4–2.8 V) charge capacitors during low-side conduction. |
| CSP, CSM, CSO | Current sense amplifier I/O | Differential inputs (±2 mV offset) and single-ended output (0.3–4.8 V range) for shunt-based phase current monitoring with programmable gain. |
| LIN, LTX, LRX | LIN bus physical interface | Integrated transceiver with recessive/dominant voltage thresholds, 30–160 µs wake-up support, and bus short-circuit protection (40–100 mA limit). |
| VBB, VREG, VLR | Power supply terminals | VBB: main battery input (5.5–50 V); VREG: gate drive supply (7.5–11.7 V); VLR: logic LDO (3.3 V or 5.0 V selectable) with 130–300 mA current limit. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable gate drive strength | Adjustable turn-on/turn-off currents (e.g., IR1 = –48 to –144 mA) enable optimization of EMI vs. switching loss trade-offs per motor phase. |
| Integrated LIN/PWM transceiver | Eliminates need for external LIN PHY; supports both LIN 2.x protocol and custom PWM communication with wake-up capability. |
| Bootstrap charge management | Top-off charge pump (35–550 µA) maintains gate drive voltage during extended high-side conduction, extending operational duty cycle at low VBB. |
| BEMF zero-crossing detection | Multiplexed BXM output with configurable filter time (0–20 ms) enables sensorless BLDC commutation without external comparators. |
| Comprehensive diagnostics | Hardware-monitored faults (VBB/VREG/VLR UV, overtemperature, bridge overcurrent, bootstrap UV) reported via DIAG pin and SPI status registers. |
Applications
| Automotive Fuel Pump Control | Electric Power Steering Assist |
|---|---|
|
Use Scenario: Driving 3-phase BLDC fuel pump motor in gasoline/diesel engine compartments under wide temperature (-40°C to 150°C) and voltage (5.5–50 V) ranges. IC Role / Device Role / Timing Role: Three-phase gate driver providing synchronized high/low-side FET control, current sensing for torque regulation, and LIN interface for ECU command/response. Use Value: Enables compact, robust pump module design with integrated diagnostics (e.g., open-load detection, overtemperature shutdown) meeting OEM functional safety requirements. |
Use Scenario: Controlling assist motor in 12 V EPS systems requiring precise torque response, fault resilience, and CAN/LIN interoperability. IC Role / Device Role / Timing Role: Motor driver with programmable dead time and BEMF sensing for sensorless commutation; supplies regulated 5 V to EPS MCU and monitors its watchdog. Use Value: Reduces BOM count by integrating gate drive, current sense, LIN PHY, MCU reset/watchdog, and diagnostics - simplifying ASIL-B system decomposition. |
| Engine Cooling Fan Module | Urea Dosing Pump (SCR System) |
|
Use Scenario: High-reliability fan control in under-hood environments subject to vibration, thermal cycling, and electrical transients. IC Role / Device Role / Timing Role: Three-phase driver with VBRG monitoring for drain voltage feedback, integrated overtemperature protection, and LIN-based speed command interface. Use Value: Eliminates discrete protection circuitry; built-in bootstrap UV and bridge fault detection prevent MOSFET destruction during stall or short-circuit events. |
Use Scenario: Precise dosing of aqueous urea solution into diesel exhaust streams, requiring accurate low-flow motor control and fault logging. IC Role / Device Role / Timing Role: Gate driver with programmable current sense gain/offset for micro-ampere-level shunt current resolution and SPI register access for real-time diagnostics. Use Value: Supports emission compliance via traceable fault reporting (e.g., EEPROM-stored fault history) and ASIL A–aligned safety mechanisms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar three-phase MOSFET driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STSPIN32F0B | Integrated 32-bit ARM Cortex-M0 MCU + gate driver; no LIN PHY; operates from 6–20 V only; lacks ASIL certification. | Best suited for cost-sensitive, self-contained motor control where firmware resides on-chip and LIN is not required. | Select STSPIN32F0B when embedded processing and compact footprint outweigh need for automotive LIN compliance and extended 5.5–50 V operation. |
| DRV8305-Q1 | Automotive-qualified 3-phase driver with SPI interface and current sense, but no integrated LIN transceiver or MCU watchdog; VBB range 4.4–45 V. | Requires external LIN transceiver and separate MCU supervisor; better for designs already using CAN or proprietary comms. | Choose DRV8305-Q1 if system already implements LIN via external PHY and prioritizes higher peak gate drive current (2 A sink) over integrated safety monitoring. |
Compared with STSPIN32F0B and DRV8305-Q1, the AMT49105KEVTR-J uniquely combines ISO 17987-compliant LIN, ASIL A SEooC certification, and 5.5–50 V operation in a single package - reducing system-level complexity for automotive BLDC modules requiring ECU integration and functional safety evidence.
Availability
AMT49105KEVTR-J is available at Aetrix Electronics and suitable for automotive fuel pumps, electric power steering assist, engine cooling fans, and urea dosing pumps requiring stable component supply across extended temperature and voltage ranges.
Supply support for AMT49105KEVTR-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 U.S.-based designer and manufacturer of high-performance magnetic sensors and power ICs, specializing in automotive and industrial motion control solutions.
The AMT49105KEVTR-J belongs to Allegro's automotive-grade three-phase motor driver product line, engineered specifically for high-reliability BLDC applications in harsh environments - integrating gate drive, diagnostics, communications, and safety functions into a single wettable-flank QFN.
FAQ
What is the minimum operating voltage for AMT49105KEVTR-J under active gate drive conditions?
The AMT49105KEVTR-J supports active gate drive operation down to 5.5 V on the VBB supply rail. Below this, the device enters functional disable mode (outputs inactive) but remains powered; it resumes full operation once VBB rises above 5.5 V. The charge pump regulator and bootstrap architecture maintain sufficient gate drive voltage even during automotive cold-crank events.
Does AMT49105KEVTR-J support sensorless BLDC commutation?
Yes, the AMT49105KEVTR-J supports sensorless commutation via its integrated BEMF zero-crossing detection circuit. The BXM multiplexed output provides filtered back-EMF signals for all three phases, with programmable filter time (0–20 ms) and comparator offset (±60 mV) to adapt to motor winding characteristics and noise conditions.
How does the AMT49105KEVTR-J handle overtemperature conditions?
The AMT49105KEVTR-J includes on-die temperature monitoring with automatic shutdown at 165°C junction temperature. When exceeded, the device disables all gate drivers, asserts the DIAG pin, and sets corresponding bits in the SPI diagnostic register. Recovery occurs only after junction temperature falls below the hysteresis threshold (~155°C), ensuring safe thermal cycling.
Can AMT49105KEVTR-J be used without an external microcontroller?
No - the AMT49105KEVTR-J is explicitly designed as a peripheral driver IC requiring an external microcontroller for motor control algorithm execution, communication protocol handling (beyond LIN physical layer), and intelligent fault interpretation. It provides gate drive, sensing, and interface functions but no embedded processor or firmware.
What LIN standard versions does AMT49105KEVTR-J support?
The AMT49105KEVTR-J complies with ISO 17987 (LIN 2.x) and SAE J2602 standards, supporting LIN 2.0, 2.1, and 2.2 physical layer requirements. It operates at standard baud rates (e.g., 19.2 kbps), includes recessive/dominant voltage thresholds aligned with specification limits, and features hardware wake-up detection per LIN specification.
AMT49105KEVTR-J 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:
- PWM, SPI
- Technology:
- NMOS
- 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, Wettable Flank
- Supplier Device Package:
- 48-QFN (7x7)
AMT49105KEVTR-J FAQ
1.How can I place an order for AMT49105KEVTR-J through Aetrix?
Please submit a Request for Quotation (RFQ) for AMT49105KEVTR-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 AMT49105KEVTR-J reliable?
The price and inventory of AMT49105KEVTR-J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AMT49105KEVTR-J is usually 5 days.
3.What payment methods are accepted for AMT49105KEVTR-J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AMT49105KEVTR-J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AMT49105KEVTR-J?
AMT49105KEVTR-J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AMT49105KEVTR-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 AMT49105KEVTR-J?
For technical support, including AMT49105KEVTR-J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AMT49105KEVTR-J requirements.
6.How does Aetrix verify that AMT49105KEVTR-J is sourced from the original manufacturer or authorized distributors?
All AMT49105KEVTR-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 AMT49105KEVTR-J meets industry standards.
7.What is the process for return or replacement of AMT49105KEVTR-J?
All AMT49105KEVTR-J units undergo pre-shipment inspection (PSI). If there is an issue with AMT49105KEVTR-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 AMT49105KEVTR-J part is unused and in its original packaging.
Return procedure for AMT49105KEVTR-J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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