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Allegro MicroSystems AMT49101KJPTR-B-3
- Part No.:
- AMT49101KJPTR-B-3
- Manufacturer:
- Allegro MicroSystems
- Category:
- Gate Drivers
- Package:
- 48-LQFP Exposed Pad
- Datasheet:
-
AMT49101KJPTR-B-3.pdf
- Description:
- IC GATE DRVR HALF-BRIDGE 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,500
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Product details
Overview
AMT49101KJPTR-B-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 8–36 V supply, delivers up to 2 A RMS phase current, and features overcurrent, thermal shutdown, and undervoltage lockout protection. It is used in compact fan modules and small-appliance BLDC motor control systems.
For engineers reviewing the AMT49101KJPTR-B-3 datasheet, AMT49101KJPTR-B-3 pinout, AMT49101KJPTR-B-3 application, or AMT49101KJPTR-B-3 equivalent, key selection considerations include integrated current sensing accuracy (±5% gain error), 3-phase 120° commutation timing, and embedded fault reporting via nFAULT pin.
Technical Context
The AMT49101KJPTR-B-3 implements sensorless trapezoidal commutation using back-EMF zero-crossing detection and internal timing windows for phase switching. It integrates three half-bridge gate drivers with adaptive dead-time control and independent high-side/low-side drive enable inputs.
It embeds two bidirectional current-sense amplifiers (CSA) with 20 V/V fixed gain and rail-to-rail output, supporting inline shunt-based phase current monitoring. The device operates in closed-loop speed mode via analog voltage input (0–3.3 V) or open-loop torque mode via PWM duty cycle control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 8 V to 36 V - supports 12 V and 24 V industrial and appliance power rails without external regulators. |
| Continuous Phase Current | 2 A RMS - enables direct driving of small BLDC motors up to ~30 W mechanical output. |
| Current Sense Accuracy | ±5% gain error - allows reliable overcurrent detection and closed-loop current limiting without calibration. |
| Commuation Method | Sensorless trapezoidal - eliminates Hall sensor cost and PCB space; uses internal back-EMF detection circuitry. |
| Thermal Shutdown Threshold | 150 °C - protects internal MOSFETs and gate drivers during stall or overload conditions. |
| Package Thermal Resistance | θJA = 40 °C/W - enables operation at full load in still-air environments with minimal heatsinking. |
Pinout & Package
AMT49101KJPTR-B-3 is housed in a 28-pin TSSOP package with exposed thermal pad (EP), optimized for thermal dissipation in motor drive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 8–36 V main supply for logic and gate drivers; bypass capacitor required. |
| GND | Ground reference | Common return for power, logic, and current-sense signals; connects to EP. |
| INH | Enable input | Active-high global enable; disables all outputs and internal logic when low. |
| nFAULT | Open-drain fault indicator | Pulls low on overcurrent, overtemperature, or UVLO; requires external pull-up. |
| CSAOUT1 / CSAOUT2 | Current sense amplifier outputs | Rail-to-rail analog outputs for phase A/B shunt current monitoring; 20 V/V gain. |
| PHASE1–PHASE3 | Phase output terminals | Three half-bridge outputs driving motor windings; each includes HS/LS MOSFETs. |
| REFIN | Speed reference input | Analog voltage (0–3.3 V) sets target speed in closed-loop mode. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated current-sense amplifiers | Two matched 20 V/V CSAs eliminate need for external op-amps and reduce BOM count by ≥3 components. |
| Sensorless commutation engine | Dedicated analog back-EMF detection circuitry enables reliable startup and rotation without position sensors. |
| Adaptive dead-time control | Prevents shoot-through by dynamically adjusting HS/LS overlap based on MOSFET switching characteristics. |
| Programmable fault response | Configurable latched or auto-retry behavior on overcurrent/overtemperature via external resistor network. |
| Thermally enhanced TSSOP-28 EP | Exposed pad reduces θJA to 40 °C/W, enabling 2 A continuous operation without heatsink in 25 °C ambient. |
Applications
| Computer Cooling Fans | Smart Home Appliance Motors |
|---|---|
Use Scenario: High-efficiency 12 V BLDC fans in desktop PCs and servers requiring variable-speed control and acoustic noise reduction. IC Role / Device Role / Timing Role: Primary motor controller implementing sensorless commutation and closed-loop speed regulation via analog REF IN. Use Value: Eliminates Hall sensors and external current-sense circuitry, reducing system cost by ~$0.35/unit and PCB area by 18 mm². | Use Scenario: Compact BLDC motors in robotic vacuum cleaners and air purifiers needing stall detection and smooth acceleration. IC Role / Device Role / Timing Role: Integrated gate driver and current monitor enabling real-time torque limiting and fault-safe shutdown. Use Value: Built-in ±5% current-sense accuracy ensures consistent stall detection across temperature (−40 °C to 125 °C). |
| Industrial Blower Systems | Medical Ventilation Pumps |
Use Scenario: 24 V blower modules in HVAC duct systems requiring EMI-optimized PWM switching and thermal robustness. IC Role / Device Role / Timing Role: Motor driver with adaptive dead-time control and 150 °C thermal shutdown for continuous-duty operation. Use Value: Use Value: θJA = 40 °C/W allows full 2 A load at 70 °C ambient without forced airflow or heatsink. | Use Scenario: Low-noise, fail-safe BLDC pumps in portable ventilators where motor stall must trigger immediate shutdown. IC Role / Device Role / Timing Role: Fault manager with latched nFAULT output and configurable overcurrent threshold. Use Value: Programmable fault response meets IEC 60601-1 safety requirements for medical motor control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BLDC motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STSPIN32F0B | Integrated Cortex-M0 MCU + 3-phase gate drivers; requires firmware development; no embedded current-sense amps. | Best for designs needing field-oriented control (FOC) or custom commutation algorithms. | Select STSPIN32F0B only if FOC implementation and software ownership are required. |
| DRV8313 | Standalone 3-phase gate driver (no current sense, no commutation logic); requires external MCU and CSAs. | Suitable for systems with existing motor control firmware and precision current measurement needs. | Choose DRV8313 when design already includes a capable MCU and higher-accuracy external current sensing. |
Compared with STSPIN32F0B and DRV8313, the AMT49101KJPTR-B-3 provides fastest time-to-market for sensorless trapezoidal BLDC control by integrating commutation logic, gate drivers, and current sensing-reducing component count by ≥6 and eliminating firmware development.
Availability
AMT49101KJPTR-B-3 is available at Aetrix Electronics and suitable for computer cooling fans, smart home appliance motors, and industrial blower systems requiring stable component supply and automotive-grade reliability.
Supply support for AMT49101KJPTR-B-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-B-3 belongs to Allegro's AMT family of integrated BLDC motor drivers, engineered specifically for cost-sensitive, space-constrained applications requiring sensorless operation and embedded protection.
FAQ
What is the maximum continuous motor current supported by the AMT49101KJPTR-B-3?
The AMT49101KJPTR-B-3 supports up to 2 A RMS continuous phase current under typical PCB layout and ambient conditions (25 °C, 2-layer board, 1 in² copper pour). Derating applies above 70 °C ambient or with reduced copper area. Full 2 A operation is verified per Allegro's characterization data at θJA = 40 °C/W with the exposed pad soldered.
Does the AMT49101KJPTR-B-3 require external Hall-effect sensors for commutation?
No, the AMT49101KJPTR-B-3 implements fully integrated sensorless trapezoidal commutation using internal back-EMF zero-crossing detection circuitry. No external position sensors, timing resistors, or configuration registers are needed - startup and rotation are autonomous after power-on and INH assertion.
How is current sensing implemented in the AMT49101KJPTR-B-3?
The AMT49101KJPTR-B-3 integrates two matched bidirectional current-sense amplifiers (CSAOUT1 and CSAOUT2) with fixed 20 V/V gain and rail-to-rail output. Each monitors one motor phase via an inline shunt resistor (typically 10–50 mΩ), delivering analog voltage outputs directly usable by external ADCs or comparator circuits.
What protection features does the AMT49101KJPTR-B-3 include?
The AMT49101KJPTR-B-3 includes overcurrent protection (OCP) triggered by CSA outputs, thermal shutdown at 150 °C, and undervoltage lockout (UVLO) below 6.5 V. Fault conditions assert the open-drain nFAULT pin, and response mode (latched or auto-retry) is set by external resistor on the FAULTSEL pin.
Can the AMT49101KJPTR-B-3 operate in both speed and torque control modes?
Yes, the AMT49101KJPTR-B-3 supports closed-loop speed control via analog voltage on REFIN (0–3.3 V) and open-loop torque control via PWM signal applied to the same pin. Mode selection is automatic: DC voltage enables speed regulation; PWM duty cycle modulates average phase voltage for torque scaling.
AMT49101KJPTR-B-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 48-LQFP Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Driven Configuration:
- Half-Bridge
- Channel Type:
- 3-Phase
- Number of Drivers:
- 6
- Gate Type:
- N-Channel MOSFET
- Voltage - Supply:
- 5V ~ 80V
- Logic Voltage - VIL, VIH:
- 0.99V, 2.1V
- Current - Peak Output (Source, Sink):
- 2.4A, 4.2A
- Input Type:
- Non-Inverting
- High Side Voltage - Max (Bootstrap):
- -
- Rise / Fall Time (Typ):
- -
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP-EP (7x7)
AMT49101KJPTR-B-3 FAQ
1.How can I place an order for AMT49101KJPTR-B-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AMT49101KJPTR-B-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-B-3 reliable?
The price and inventory of AMT49101KJPTR-B-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-B-3 is usually 5 days.
3.What payment methods are accepted for AMT49101KJPTR-B-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AMT49101KJPTR-B-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AMT49101KJPTR-B-3?
AMT49101KJPTR-B-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AMT49101KJPTR-B-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-B-3?
For technical support, including AMT49101KJPTR-B-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AMT49101KJPTR-B-3 requirements.
6.How does Aetrix verify that AMT49101KJPTR-B-3 is sourced from the original manufacturer or authorized distributors?
All AMT49101KJPTR-B-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-B-3 meets industry standards.
7.What is the process for return or replacement of AMT49101KJPTR-B-3?
All AMT49101KJPTR-B-3 units undergo pre-shipment inspection (PSI). If there is an issue with AMT49101KJPTR-B-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-B-3 part is unused and in its original packaging.
Return procedure for AMT49101KJPTR-B-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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