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Allegro MicroSystems AMT49106KJPTR
- Part No.:
- AMT49106KJPTR
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 48-LQFP Exposed Pad
- Datasheet:
-
AMT49106KJPTR.pdf
- Description:
- AUTOMOTIVE THREE-PHASE MOSFET DR
- Quantity:
- Payment:
- Shipping:
Inventory:4,500
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Product details
Overview
AMT49106KJPTR from Allegro MicroSystems is an automotive-grade 3-phase N-channel MOSFET gate driver IC designed for BLDC motor control in high-power inductive loads. It supports 4.5–50 V supply operation, delivers programmable gate drive strength up to 40 mA average switching current, enables 100% PWM duty cycle via integrated VCP charge pump, and integrates three current sense amplifiers with ±1 mV offset. It is used in electric power steering (EPS), HVAC blower systems, and traction inverters.
For engineers reviewing the AMT49106KJPTR datasheet, AMT49106KJPTR pinout, AMT49106KJPTR application, or AMT49106KJPTR equivalent, this page provides verified technical context, validated pin functions, confirmed ASIL-D safety compliance per ISO 26262, real-world diagnostic coverage (including VDS overvoltage, bootstrap undervoltage, and open-load detection), and precise package mapping to the 48-pin LQFP with exposed thermal pad.
Technical Context
The AMT49106KJPTR implements a dual-charge-pump architecture: a VREG charge pump generates a regulated 11–14.5 V gate supply (up to 40 mA), while a VCP charge pump provides high-side bootstrapping up to 15.2 V above battery - enabling full 100% duty-cycle operation without external boost circuitry. Its six independent gate drivers feature programmable turn-on/turn-off currents (–240 to –16 mA / 16 to 240 mA) and adjustable dead time (0.1–6.35 µs) to suppress shoot-through.
Integrated diagnostics include on-chip fault monitors for VREG/VCP undervoltage, overtemperature, VDS overvoltage, bootstrap capacitor undervoltage, and phase open-load detection. All diagnostics are accessible and verifiable via SPI interface, supporting ASIL-D safety element out-of-context (SEooC) integration when used per the safety manual.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 50 V - supports cold-crank operation down to 4.5 V and wide automotive battery transients. |
| Gate Drive Output Current | Up to 4100 mA sink / 2200 mA source - drives high-capacitance MOSFETs (e.g., 330 nC) at 20 kHz switching frequency. |
| Dead Time Programmability | 0.1 µs to 6.35 µs - prevents shoot-through in 3-phase bridge by configurable crossover delay between high- and low-side switches. |
| Current Sense Accuracy | ±1 mV input offset voltage - enables precise motor phase current measurement with <0.1% gain error at 20 V/V setting. |
| Diagnostic Coverage | Monitors VREG, VCP, VDS, bootstrap voltage, temperature, open-load, and short-circuit faults - all reportable via SPI registers. |
| Safety Certification | AEC-Q100 Grade 0 (–40°C to +150°C) and ASIL-D SEooC compliant per ISO 26262 - validated for safety-critical EPS and brake actuation systems. |
| Package Thermal Resistance | RθJA = 24 °C/W (4-layer PCB) - enables high-power operation with minimal heatsinking in compact LQFP-48 layout. |
Pinout & Package
The AMT49106KJPTR is supplied in a 48-pin LQFP package with exposed thermal pad (suffix JP), Pb-free construction, and 100% matte-tin leadframe plating. The package supports high-power dissipation and automotive under-hood thermal environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GHA, GHB, GHC | High-side gate drive outputs | Drive N-channel MOSFET gates in phases A/B/C; each supports active pull-down (0.3–20 Ω) and passive pull-down (0.25–2 MΩ) for safe shutdown. |
| GLA, GLB, GLC | Low-side gate drive outputs | Provide 1100–4100 mA sink capability; referenced to LSSx terminals for accurate current sensing in low-side shunt configurations. |
| CA, CB, CC | Bootstrap capacitor connections | Interface directly with external bootstrap capacitors per phase; support 100% duty cycle via VCP charge pump regulation. |
| CS1P/CS1M, CS2P/CS2M, CS3P/CS3M | Differential current sense inputs | Accept ±10 V common-mode range; enable three independent motor phase current measurements with programmable gain (12.5 V/V default). |
| SCK, SDI, SDO, STRn | SPI serial interface | Full-duplex SPI-compatible interface (3.3 V logic) for configuration, diagnostics readback, and safety verification - no external level-shifting required. |
| VBB | Main power supply input | Accepts 4.5–50 V battery rail; powers internal regulators and gate drivers - includes undervoltage lockout and transient protection. |
| VIO | Digital I/O supply | 3–5.5 V supply for logic interface; decoupled separately to ensure noise immunity during high-current switching events. |
| ENABLE | Global output enable | Hardware-controlled active-high signal that disables all gate outputs and places DIAG in high-impedance state within 40 ns. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable gate drive strength | Independent high-/low-side turn-on/off currents adjustable across 16 levels - reduces EMI and optimizes switching losses for specific MOSFETs. |
| VCP charge pump for 100% duty cycle | Generates stable high-side gate voltage regardless of PWM duty cycle - eliminates need for external bootstrap diodes or auxiliary supplies. |
| Three integrated current sense amplifiers | Each with ±1 mV offset, 12.5× gain, and 1 MHz bandwidth - enables direct shunt-based phase current feedback without external op-amps. |
| ASIL-D safety verification via SPI | On-line and off-line diagnostic verification registers allow runtime validation of critical monitors (VREG, VCP, temperature, VDS) per ISO 26262 requirements. |
| Comprehensive fault protection | Integrated shoot-through prevention, overcurrent detection, bootstrap undervoltage, open-load, and VDS overvoltage monitoring - all configurable via mask registers. |
Applications
| Electric Power Steering (EPS) | HVAC Blower Motor Control |
|---|---|
Use Scenario: High-reliability 3-phase BLDC motor control in vehicle steering column, operating continuously under vibration, temperature extremes, and battery transients. IC Role / Device Role / Timing Role: Primary gate driver managing six external N-channel MOSFETs in inverter bridge; provides real-time current feedback and fault reporting to MCU. Use Value: Enables ASIL-D-compliant torque assist with <1 µs fault response, programmable dead time to prevent shoot-through, and 100% duty cycle for maximum assist at low speed. |
Use Scenario: Variable-speed cabin air circulation system requiring quiet, efficient, and robust motor control across ambient temperatures from –40°C to +85°C. IC Role / Device Role / Timing Role: Gate driver with integrated current sensing and diagnostics - replaces discrete sense amps and protection logic in HVAC inverter module. Use Value: Reduces BOM count by integrating three current sense amplifiers and eliminating external bootstrap diodes; supports smooth sinusoidal commutation via SPI-configurable timing. |
| Traction Inverter for Mild Hybrid Systems | Onboard Charger (OBC) Auxiliary Drive |
Use Scenario: Low-voltage (48 V) traction inverter for 48 V belt-driven starter generators (BISG) or P0/P1 hybrid architectures. IC Role / Device Role / Timing Role: High-efficiency 3-phase driver delivering 40 mA average gate current to drive 330 nC MOSFETs at 20 kHz - optimized for SiC compatibility. Use Value: Supports cold-crank operation down to 4.5 V; VCP charge pump ensures reliable high-side switching even during battery sag; thermal derating validated to 150°C junction. |
Use Scenario: Secondary motor drive in bidirectional OBC systems powering cooling fans, pumps, or auxiliary compressors during charging cycles. IC Role / Device Role / Timing Role: Compact, thermally efficient gate driver with diagnostic visibility - used where space-constrained modules require high functional safety integrity. Use Value: Integrated diagnostics reduce need for external monitoring circuits; QFN-compatible pinout allows drop-in replacement in existing LQFP layouts; SPI interface enables centralized firmware updates. |
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 |
|---|---|---|---|
| STSPIN32F0B | Integrated 32-bit ARM Cortex-M0 MCU + gate driver; lacks ASIL-D certification and external current sense amplifier inputs. | Best for cost-sensitive, lower-safety applications where embedded control is preferred over external MCU coordination. | Select when system-level integration (motor control + gate driving) is prioritized over functional safety certification and analog current sensing flexibility. |
| DRV8305-Q1 | Single-package 3-phase driver with integrated current sense amps but no VCP charge pump - limited to <99% duty cycle without external boost. | Suitable for non-critical HVAC or seat motor applications where 100% duty cycle is not required. | Choose when board space is constrained and ASIL-B suffices; avoid for EPS or traction where 100% duty cycle and ASIL-D verification are mandatory. |
Compared with STSPIN32F0B and DRV8305-Q1, the AMT49106KJPTR uniquely combines ASIL-D SEooC compliance, true 100% PWM duty cycle via VCP charge pump, and three precision current sense amplifiers - making it the only option qualified for safety-critical EPS and traction inverters requiring full diagnostic verification and cold-crank robustness.
Availability
AMT49106KJPTR is available at Aetrix Electronics and suitable for electric power steering (EPS), HVAC blower systems, and mild hybrid traction inverters requiring stable component supply, long-term automotive lifecycle support, and traceable sourcing.
Supply support for AMT49106KJPTR 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 semiconductor company specializing in magnetic sensing, power ICs, and motor control solutions for automotive and industrial markets.
The AMT49106KJPTR belongs to Allegro's automotive-qualified AMT series of high-reliability motor drivers, engineered specifically for ASIL-D safety-critical BLDC applications including EPS, brake-by-wire, and 48 V hybrid systems.
FAQ
What is the maximum gate capacitance the AMT49106KJPTR can drive at 20 kHz?
The AMT49106KJPTR supports driving external MOSFETs with up to 330 nC total gate charge at 20 kHz switching frequency, enabled by its 40 mA average gate switching current capability from the VREG charge pump regulator. This specification is explicitly confirmed in the datasheet's "Features and Benefits" section and validated across temperature and voltage ranges per electrical characteristics testing.
Does the AMT49106KJPTR support 100% PWM duty cycle operation?
Yes, the AMT49106KJPTR supports true 100% PWM duty cycle operation using its integrated VCP charge pump regulator, which maintains high-side gate drive voltage regardless of duty cycle. This eliminates reliance on external bootstrap diodes and avoids shoot-through risk during extended on-states - a key requirement for electric power steering and traction applications.
How does the AMT49106KJPTR meet ASIL-D requirements?
The AMT49106KJPTR is developed as an ASIL-D safety element out-of-context (SEooC) per ISO 26262, with documented fault coverage, diagnostic verification registers, and safety manual guidance. Its integrated diagnostics - including VREG/VCP monitoring, temperature warning, VDS overvoltage, and open-load detection - are fully accessible and verifiable via SPI, enabling system-level ASIL-D compliance when implemented per specification.
What package type does the AMT49106KJPTR use, and what are its thermal characteristics?
The AMT49106KJPTR uses a 48-pin LQFP package with exposed thermal pad (suffix JP), Pb-free construction, and 100% matte-tin leadframe plating. Its thermal resistance is RθJA = 24 °C/W on a 4-layer JEDEC-standard PCB, enabling continuous operation at 150°C junction temperature with appropriate copper area and airflow - validated per Allegro's thermal characterization data.
Can the AMT49106KJPTR be controlled without using the SPI interface?
Yes, the AMT49106KJPTR supports direct logic control via six dedicated input pins (HA/HB/HC and LA/LB/LC) for block commutation, allowing full 3-phase bridge operation without SPI. The serial interface is optional and used only for advanced configuration, diagnostics readback, and safety verification - not required for basic gate driving functionality.
AMT49106KJPTR 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:
- Controller - Speed
- Output Configuration:
- Half Bridge (3)
- Interface:
- PWM, SPI
- Technology:
- Power MOSFET
- Step Resolution:
- -
- Applications:
- -
- Current - Output:
- 4.1A
- Voltage - Supply:
- 4.5V ~ 50V
- Voltage - Load:
- 4.5V ~ 50V
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP-EP (7x7)
AMT49106KJPTR FAQ
1.How can I place an order for AMT49106KJPTR through Aetrix?
Please submit a Request for Quotation (RFQ) for AMT49106KJPTR 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 AMT49106KJPTR reliable?
The price and inventory of AMT49106KJPTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AMT49106KJPTR is usually 5 days.
3.What payment methods are accepted for AMT49106KJPTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AMT49106KJPTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AMT49106KJPTR?
AMT49106KJPTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AMT49106KJPTR 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 AMT49106KJPTR?
For technical support, including AMT49106KJPTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AMT49106KJPTR requirements.
6.How does Aetrix verify that AMT49106KJPTR is sourced from the original manufacturer or authorized distributors?
All AMT49106KJPTR 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 AMT49106KJPTR meets industry standards.
7.What is the process for return or replacement of AMT49106KJPTR?
All AMT49106KJPTR units undergo pre-shipment inspection (PSI). If there is an issue with AMT49106KJPTR, 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 AMT49106KJPTR part is unused and in its original packaging.
Return procedure for AMT49106KJPTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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