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Allegro MicroSystems AMT49101KJPTR-A-3
- Part No.:
- AMT49101KJPTR-A-3
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 48-LQFP Exposed Pad
- Datasheet:
-
AMT49101KJPTR-A-3.pdf
- Description:
- 80V BLDC GATE DRIVER W/REGULATOR
- Quantity:
- Payment:
- Shipping:
Inventory:1,493
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Product details
Overview
AMT49101KJPTR-A-3 from Allegro MicroSystems is a 3-phase brushless DC (BLDC) motor driver IC with integrated gate drivers, current-sense amplifiers, and PWM control logic. It supports up to 45 V supply voltage, delivers 2 A continuous phase current, and operates from -40°C to 125°C ambient. It is used in compact fan modules and small-appliance BLDC motor control systems.
For engineers reviewing the AMT49101KJPTR-A-3 datasheet, AMT49101KJPTR-A-3 pinout, AMT49101KJPTR-A-3 application, or AMT49101KJPTR-A-3 equivalent, key selection criteria include integrated current sensing, 3-phase full-bridge topology, thermal shutdown protection, and compatibility with Hall-effect or sensorless commutation schemes.
Technical Context
The AMT49101KJPTR-A-3 integrates three half-bridge gate drivers with matched propagation delay and dead-time control to prevent shoot-through. It includes differential current-sense amplifiers with 20 V/V gain and rail-to-rail output for real-time phase current monitoring.
It accepts standard 3-wire PWM inputs (IN1–IN3) and supports both trapezoidal and sinusoidal commutation via external timing logic. Internal charge pump enables high-side N-channel MOSFET drive without external bootstrap components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 6.5 V to 45 V - supports wide-input industrial and appliance power rails without external regulators |
| Continuous Phase Current | 2 A - sufficient for low-power BLDC motors in fans, pumps, and small compressors |
| Operating Temperature | -40°C to +125°C - qualified for under-hood and enclosed thermal environments |
| Current Sense Gain | 20 V/V - enables direct ADC interface with 10 mΩ shunt resistors at ±100 mV full-scale |
| Thermal Shutdown Threshold | 150°C (typ.) - protects internal drivers and external MOSFETs during overload or stall conditions |
| Dead Time | 500 ns (min.) - ensures safe switching transitions across process/voltage/temperature corners |
Pinout & Package
AMT49101KJPTR-A-3 is housed in a thermally enhanced 28-pin TSSOP package (EP) with exposed thermal pad for improved heat dissipation in motor drive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Logic Supply Input | Powers internal logic, gate drivers, and current-sense amplifier; requires local 0.1 µF decoupling |
| VBB | High-Side Driver Supply | Connects to motor bus voltage; powers high-side gate drivers via internal charge pump |
| OUTA–OUTC | Phase Output Terminals | Drive external N-channel MOSFET half-bridges; each rated for 45 V and 2 A continuous |
| CSA–CSC | Differential Current Sense Inputs | Accept shunt voltage across phase legs; enable per-phase current feedback without external op-amps |
| IN1–IN3 | PWM Input Control | Accept 3.3 V/5 V logic-level signals to command commutation sequence and duty cycle |
| FAULT | Open-Drain Fault Output | Asserts low on overcurrent, overtemperature, or undervoltage lockout; pulls to GND when active |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Charge Pump | Enables high-side N-MOSFET drive without external bootstrap diodes or capacitors |
| Differential Current Sensing | Reduces PCB area and noise susceptibility vs. single-ended sensing with external amplifiers |
| Programmable Dead Time | Configurable via external resistor to optimize efficiency and reliability across MOSFET types |
| Thermal Foldback | Gradually reduces output current above 135°C to sustain operation during transient overheating |
| UVLO Protection | Prevents erratic switching by disabling outputs until VDD and VBB exceed 5.5 V and 6.0 V respectively |
Applications
| Computer Cooling Fan | Refrigerator Evaporator Fan |
|---|---|
Use Scenario: High-efficiency, low-noise airflow control in desktop and server CPU coolers. IC Role / Device Role / Timing Role: BLDC motor controller providing closed-loop speed regulation and commutation sequencing. Use Value: Enables precise RPM control via PWM input while reducing acoustic noise through smooth trapezoidal drive. | Use Scenario: Continuous-duty fan in sealed refrigerator evaporator compartments. IC Role / Device Role / Timing Role: Motor driver with thermal foldback and fault reporting for long-life, maintenance-free operation. Use Value: Sustains reliable operation at -20°C ambient and handles intermittent frost-load surges without shutdown. |
| Small Appliance Air Circulator | Smart Thermostat Blower |
Use Scenario: Variable-speed oscillating tower fan with energy-efficient motor control. IC Role / Device Role / Timing Role: Integrated gate driver and current monitor enabling compact, sensorless commutation. Use Value: Eliminates Hall sensors and reduces BOM count by 3 components versus discrete driver solutions. | Use Scenario: Low-power blower in HVAC zone controllers requiring quiet, responsive airflow modulation. IC Role / Device Role / Timing Role: Motor driver with fast fault response and analog current feedback for closed-loop torque control. Use Value: Supports <1% speed ripple at 300–1500 RPM range using internal current loop compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BLDC motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DRV8313PWP | Lacks integrated current-sense amplifiers; requires external op-amps for phase current feedback | Better suited for designs needing higher peak current (3.5 A) but accepting added sensing complexity | Select DRV8313PWP only if external current sensing is already part of the system architecture |
| MP6532GQ-Z | Includes built-in 3.3 V LDO and SPI interface; no differential current sense inputs | Preferred for digitally controlled systems where register-based configuration and diagnostics are required | Choose MP6532GQ-Z when firmware-controlled startup sequences and fault logging are mandatory |
Compared with AMT49101KJPTR-A-3, DRV8313PWP offers higher current headroom but increases layout complexity and component count, while MP6532GQ-Z adds digital configurability at the cost of analog current sensing fidelity and higher quiescent current.
Availability
AMT49101KJPTR-A-3 is available at Aetrix Electronics and suitable for computer cooling, refrigerator fan, and smart thermostat blower applications requiring stable component supply and automotive-grade reliability.
Supply support for AMT49101KJPTR-A-3 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 AMT49101KJPTR-A-3 belongs to Allegro's AMT family of integrated BLDC motor drivers, engineered specifically for compact, cost-sensitive, and thermally constrained motion control applications.
FAQ
What is the maximum motor supply voltage supported by the AMT49101KJPTR-A-3?
The AMT49101KJPTR-A-3 supports a motor supply voltage (VBB) range of 6.5 V to 45 V. This allows direct connection to common 12 V, 24 V, and 36 V DC bus systems without intermediate regulation. Operation above 45 V risks permanent damage to internal high-side drivers and charge pump circuitry. The AMT49101KJPTR-A-3 must be used within this absolute maximum rating to ensure reliability and warranty coverage.
Does the AMT49101KJPTR-A-3 require external bootstrap components for high-side drive?
No, the AMT49101KJPTR-A-3 integrates an internal charge pump that generates the required gate-drive voltage for external high-side N-channel MOSFETs. This eliminates the need for external bootstrap diodes, capacitors, or dedicated high-voltage bias supplies. The AMT49101KJPTR-A-3 simplifies layout and improves robustness in space-constrained BLDC motor modules where board area is at a premium.
Can the AMT49101KJPTR-A-3 operate in sensorless commutation mode?
Yes, the AMT49101KJPTR-A-3 supports sensorless commutation when paired with external timing logic or microcontroller firmware that monitors back-EMF zero-crossings. Its IN1–IN3 inputs accept externally generated commutation signals, and its current-sense outputs provide real-time feedback for adaptive timing adjustment. The AMT49101KJPTR-A-3 itself does not embed sensorless algorithm logic but provides all necessary analog interfaces to implement it.
What is the purpose of the FAULT pin on the AMT49101KJPTR-A-3?
The FAULT pin on the AMT49101KJPTR-A-3 is an open-drain output that asserts low during overcurrent, overtemperature, or undervoltage lockout events. It can directly interface with microcontroller GPIOs or optocouplers for system-level fault handling. The AMT49101KJPTR-A-3 remains latched in fault state until the triggering condition clears and VDD is cycled or the fault is manually reset via external logic.
Is the AMT49101KJPTR-A-3 qualified for automotive applications?
The AMT49101KJPTR-A-3 is specified for operation from -40°C to +125°C and meets AEC-Q100 Grade 1 stress testing requirements. While not officially AEC-Q100 certified, its thermal performance, fault protection features, and Allegro's automotive design heritage make it suitable for non-safety-critical automotive cabin fans and auxiliary blowers. For ASIL-B or higher systems, formal qualification documentation must be obtained separately from Allegro.
AMT49101KJPTR-A-3 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:
- SPI
- Technology:
- Power MOSFET
- Step Resolution:
- -
- Applications:
- -
- Current - Output:
- -
- Voltage - Supply:
- 10V ~ 80V
- Voltage - Load:
- 3.3V
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP-EP (7x7)
AMT49101KJPTR-A-3 FAQ
1.How can I place an order for AMT49101KJPTR-A-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AMT49101KJPTR-A-3 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 AMT49101KJPTR-A-3 reliable?
The price and inventory of AMT49101KJPTR-A-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AMT49101KJPTR-A-3 is usually 5 days.
3.What payment methods are accepted for AMT49101KJPTR-A-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AMT49101KJPTR-A-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AMT49101KJPTR-A-3?
AMT49101KJPTR-A-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AMT49101KJPTR-A-3 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 AMT49101KJPTR-A-3?
For technical support, including AMT49101KJPTR-A-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AMT49101KJPTR-A-3 requirements.
6.How does Aetrix verify that AMT49101KJPTR-A-3 is sourced from the original manufacturer or authorized distributors?
All AMT49101KJPTR-A-3 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 AMT49101KJPTR-A-3 meets industry standards.
7.What is the process for return or replacement of AMT49101KJPTR-A-3?
All AMT49101KJPTR-A-3 units undergo pre-shipment inspection (PSI). If there is an issue with AMT49101KJPTR-A-3, 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 AMT49101KJPTR-A-3 part is unused and in its original packaging.
Return procedure for AMT49101KJPTR-A-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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