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Allegro MicroSystems AMT49406GLPTR
- Part No.:
- AMT49406GLPTR
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
AMT49406GLPTR.pdf
- Description:
- THREE PHASE FOC BLDC MOTOR CONTR
- Quantity:
- Payment:
- Shipping:
Inventory:38,801
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Product details
Overview
AMT49406GLPTR from Allegro MicroSystems is a 3-phase, sensorless, field-oriented control (FOC) BLDC motor controller with integrated gate driver, operating from 5.5 V to 50 V. It delivers code-free FOC for optimal efficiency and acoustic noise reduction, supports analog/PWM/CLOCK speed control modes, and enables closed-loop RPM regulation with programmable speed-to-frequency ratio-used in ceiling fans, pedestal fans, and bathroom exhaust systems.
For engineers reviewing the AMT49406GLPTR datasheet, AMT49406GLPTR pinout, AMT49406GLPTR application, or AMT49406GLPTR equivalent, this page provides verified technical context, validated package mapping to 24-lead TSSOP-LP, confirmed I²C-configurable motor parameters (rated voltage/current/speed), thermal shutdown at 165°C, and real-world startup behavior under stationary/windmill/reverse-windmill conditions.
Technical Context
The AMT49406GLPTR implements a fully integrated, code-free FOC algorithm that computes rotor position and torque vector without Hall sensors or back-EMF observers requiring external tuning. Its proprietary non-reverse fast startup ensures unidirectional rotation on power-up by suppressing reverse shaking during initial commutation.
It features Soft-On Soft-Off (SOSO) current ramping for acoustic noise suppression, configurable dead time (400 ns typ.), and dual-mode protection: lock detection with auto-restart and overcurrent protection triggered by MOSFET VDS monitoring-not shunt-based only. The I²C interface (7-bit address 0x55) programs EEPROM registers for rated speed (0–1023 Hz), current (0–2047 mA), resistance, inductance, and startup profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5.5 V to 50 V - supports wide-input 12/24/48 V DC fan and pump systems without external regulators. |
| Motor Control Algorithm | Integrated code-free field-oriented control (FOC) - eliminates need for MCU-based motor control firmware and sensor feedback circuitry. |
| Speed Input Modes | Analog (0.25–2.5 V), PWM (80 Hz–100 kHz), or CLOCK (1–2000 Hz) - selectable via EEPROM; enables flexible system-level interface design. |
| Closed-Loop Accuracy | ±0.1 rpm in CLOCK mode, ±5% in analog/PWM mode - ensures precise RPM regulation for quiet, consistent airflow delivery. |
| Thermal Protection | Thermal shutdown at 165°C with 20°C hysteresis - prevents latch-up during sustained overload or poor heatsinking in enclosed fan housings. |
| Current Sensing | Differential bus sensing via SENP/SENN pins with ≤65 mV full-scale - supports Kelvin-shunt configurations for accurate phase current limiting up to 1.3× rated current. |
| Package Type | 24-lead TSSOP with exposed thermal pad (LP) - optimized for surface-mount assembly and thermal dissipation (RθJA = 36°C/W on 2-layer PCB). |
Pinout & Package
AMT49406GLPTR is housed in a 24-lead TSSOP package with exposed thermal pad (LP), measuring 7.8 mm × 4.4 mm × 1.2 mm, RoHS-compliant and lead-free with 100% matte-tin plating. The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–12, 14–24 (see LP diagram) | Signal and power terminals | Includes GHx/GLx high/low-side gate drivers, SPD speed input, DIR direction control, BRAKE active-high braking, FAULT open-drain fault indicator, FG tachometer output, SENP/SENN differential current sense, VREG 2.8 V reference, VCP/CP1/CP2 charge pump, LSS low-side source, SA/SB/SC motor outputs, VBB power supply, GND, NC. |
| VBB (Pin 24) | Main power supply input | Accepts 5.5–50 V DC; powers internal logic, gate drivers, and charge pump; requires local 0.1 µF + 0.22 µF decoupling. |
| SPD (Pin 5) | Speed demand input / I²C SCL | Configurable as analog voltage, PWM duty, or clock frequency input; doubles as I²C clock line-first command must occur within 9.8 ms of power-up or standby exit. |
| FG (Pin 8) | Motor speed feedback output / I²C SDA | Open-drain tach signal (pulses per revolution); defaults high after power-on; repurposed as I²C data line after first command. |
| SENP/SENN (Pins 10/9) | Differential current sense inputs | Monitor bus current for FOC and overcurrent protection; require Kelvin-connected shunt resistor (e.g., 15 mΩ for 4 A rated current). |
Key Features
| Feature | Design Value |
|---|---|
| Code-free sensorless FOC | Eliminates requirement for position sensors or external observer algorithms-reduces BOM count and firmware complexity in fan motor drives. |
| Proprietary non-reverse fast startup | Guarantees forward-direction startup from standstill, windmill, or reverse-windmill conditions-prevents mechanical vibration and audible "clunk" in consumer appliances. |
| Soft-On Soft-Off (SOSO) | Gradually ramps motor current at ON/OFF transitions-reduces acoustic noise and electromagnetic interference in residential ventilation systems. |
| Configurable current limit | Programmable peak phase current limit set to 1.3× rated current-protects MOSFETs and motor windings during acceleration or load surges. |
| Windmill startup operation | Detects and synchronizes to rotating rotor before applying torque-enables seamless restart during power interruption in ceiling fans. |
| Lock detection with auto-restart | Monitors rotor position error; disables drive for configurable tLOCK; attempts up to 10 restarts before latching fault-improves reliability in jammed pump scenarios. |
Applications
| Ceiling Fan Motor Drive | Pedestal Fan Speed Control |
|---|---|
|
Use Scenario: Variable-speed AC/DC ceiling fan requiring silent, energy-efficient operation across multiple airflow settings. IC Role / Device Role / Timing Role: Primary BLDC motor controller executing sensorless FOC, managing gate drive timing, and regulating RPM via analog voltage or PWM input. Use Value: Delivers >90% efficiency and <25 dB(A) acoustic noise at mid-speeds using SOSO and non-reverse startup-meeting ENERGY STAR® and Quiet Home certification requirements. |
Use Scenario: Portable pedestal fan with oscillation, remote control, and multi-speed presets. IC Role / Device Role / Timing Role: Integrated gate driver and FOC engine controlling three-phase inverter; accepts IR-remote-derived PWM commands and manages brake/direction sequencing. Use Value: Enables smooth speed transitions and zero-reverse jerk during direction reversal-critical for user safety and perceived product quality in consumer-grade fans. |
| Bathroom Exhaust Fan | Home Appliance Pump Driver |
|
Use Scenario: Humidity-triggered exhaust fan operating intermittently in high-moisture environments with thermal stress. IC Role / Device Role / Timing Role: Motor controller with integrated thermal shutdown (165°C), lock detection, and standby mode-manages fan run-time and fault recovery autonomously. Use Value: Extends service life in 40–60°C ambient enclosures by reducing thermal cycling stress and enabling safe shutdown before MOSFET failure. |
Use Scenario: Small-capacity condensate or circulation pump in dehumidifiers or HVAC units requiring precise flow control. IC Role / Device Role / Timing Role: Closed-loop speed regulator using CLOCK input mode with programmable speed_ctrl_ratio (e.g., 4 rpm/Hz) for linear flow-rate response. Use Value: Achieves ±0.1 rpm speed accuracy-enabling repeatable fluid displacement per cycle and eliminating flow pulsation in precision moisture removal applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BLDC motor controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AMT49406GESSR | Identical silicon die and feature set; differs only in 24-contact QFN-ES package (4 mm × 4 mm) with RθJA = 45°C/W vs. LP's 36°C/W. | Better suited for space-constrained PCBs where footprint area < 16 mm² is critical; less effective thermal dissipation in high-power fan modules. | Select AMT49406GESSR when board area is limited and power dissipation ≤2.5 W; choose AMT49406GLPTR for higher ambient temperatures or sustained 3–5 W motor drive loads. |
| MP6532GQ-Z | 3-phase gate driver only-no integrated FOC, no I²C configuration, no SOSO or windmill startup; requires external MCU for commutation logic. | Used in cost-sensitive, fixed-speed or basic PWM-controlled BLDC systems where acoustic noise and startup robustness are secondary. | AMT49406GLPTR reduces system-level design effort and component count; MP6532GQ-Z offers lower unit cost only when full FOC functionality is implemented externally. |
Compared with AMT49406GESSR, AMT49406GLPTR provides superior thermal performance in fan modules with limited airflow; compared with MP6532GQ-Z, it eliminates MCU dependency and delivers out-of-box FOC, startup reliability, and acoustic optimization-reducing time-to-market for Class II appliance designs.
Availability
AMT49406GLPTR is available at Aetrix Electronics and suitable for ceiling fans, pedestal fans, and bathroom exhaust systems requiring stable component supply, long-lifecycle support, and automotive-grade reliability validation.
Supply support for AMT49406GLPTR 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 power ICs and magnetic sensors, specializing in motion control, energy efficiency, and reliability-critical applications.
The AMT49406GLPTR belongs to Allegro's AMT family of smart motor controllers-engineered specifically for ultra-quiet, high-efficiency BLDC fan and pump drives in residential and commercial HVAC equipment.
FAQ
What is the maximum motor supply voltage supported by the AMT49406GLPTR?
The AMT49406GLPTR supports a continuous motor supply voltage range of 5.5 V to 50 V, with absolute maximum rating at 50 V. Operation above 48 V is not recommended for sustained driving due to internal gate driver voltage limits and thermal constraints. The device includes VBB UVLO with 4.75 V turn-on threshold and 300 mV hysteresis to ensure clean startup.
How does the AMT49406GLPTR handle motor startup under windmill conditions?
The AMT49406GLPTR detects rotor rotation via back-EMF monitoring and synchronizes commutation to the existing spin direction before applying torque-enabling seamless restart without abrupt braking or reversal. This windmill startup capability is enabled by default and configurable via EEPROM register STARTUP_MODE (address 11), supporting align-&-go or slight-move strategies depending on inertia and load.
Can the AMT49406GLPTR operate without an external microcontroller?
Yes-the AMT49406GLPTR is a self-contained BLDC controller with integrated FOC, gate drivers, protection logic, and EEPROM-based configuration. It requires no external MCU for basic operation: speed, direction, and brake are controlled via dedicated pins (SPD, DIR, BRAKE), while advanced parameters (rated current, resistance, PID gains) are pre-programmed into its 24-word EEPROM using I²C during manufacturing.
What thermal management is required for the AMT49406GLPTR in a 24 V, 3 A fan application?
In a 24 V, 3 A fan application dissipating ~2.5 W, the AMT49406GLPTR's 24-lead TSSOP-LP package requires a minimum 200 mm² copper pour connected to the exposed thermal pad via ≥4 thermal vias (0.3 mm diameter). With this layout, junction temperature rise remains below 50°C at 25°C ambient-well within the –40°C to 105°C operating range and 150°C max junction limit.
Does the AMT49406GLPTR support closed-loop speed control in all input modes?
No-closed-loop speed control is always enabled in CLOCK mode, but optional in analog and PWM modes via EEPROM bit SPEED_CLOSE_LOOP (address 8, bit 11). When disabled, output amplitude scales linearly with input; when enabled, motor speed tracks rated_speed × (analog_input / 2.5 V) or rated_speed × duty_cycle, ensuring consistent RPM regardless of supply or load variation.
AMT49406GLPTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Motor Type - Stepper:
- Multiphase
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Controller - Commutation, Direction Management
- Output Configuration:
- Half Bridge (3)
- Interface:
- Analog, I2C, PWM
- Technology:
- Power MOSFET
- Step Resolution:
- -
- Applications:
- Fan Controller
- Current - Output:
- -
- Voltage - Supply:
- 5.5V ~ 50V
- Voltage - Load:
- -
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP-EP
AMT49406GLPTR FAQ
1.How can I place an order for AMT49406GLPTR through Aetrix?
Please submit a Request for Quotation (RFQ) for AMT49406GLPTR 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 AMT49406GLPTR reliable?
The price and inventory of AMT49406GLPTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AMT49406GLPTR is usually 5 days.
3.What payment methods are accepted for AMT49406GLPTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AMT49406GLPTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AMT49406GLPTR?
AMT49406GLPTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AMT49406GLPTR 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 AMT49406GLPTR?
For technical support, including AMT49406GLPTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AMT49406GLPTR requirements.
6.How does Aetrix verify that AMT49406GLPTR is sourced from the original manufacturer or authorized distributors?
All AMT49406GLPTR 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 AMT49406GLPTR meets industry standards.
7.What is the process for return or replacement of AMT49406GLPTR?
All AMT49406GLPTR units undergo pre-shipment inspection (PSI). If there is an issue with AMT49406GLPTR, 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 AMT49406GLPTR part is unused and in its original packaging.
Return procedure for AMT49406GLPTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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