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Allegro MicroSystems AMT49406GESSR
- Part No.:
- AMT49406GESSR
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
AMT49406GESSR.pdf
- Description:
- THREE PHASE FOC BLDC MOTOR CONTR
- Quantity:
- Payment:
- Shipping:
Inventory:10,873
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Product details
Overview
AMT49406GESSR from Allegro MicroSystems is a 3-phase, sensorless, field-oriented control (FOC) BLDC motor gate driver IC operating from 5.5 V to 48 V (absolute max 50 V), integrating closed-loop speed control, analog/PWM/CLOCK input modes, and I²C programmability for rated voltage, current, speed, and startup profiles. It delivers quiet operation via Soft-On Soft-Off (SOSO) and proprietary non-reverse fast startup, targeting ceiling fans, pedestal fans, and bathroom exhaust systems.
For engineers reviewing the AMT49406GESSR datasheet, AMT49406GESSR pinout, AMT49406GESSR application, or AMT49406GESSR equivalent, this page provides verified technical context, validated package mapping (24-pin QFN-ES), confirmed pin functions, real-world motor control parameters, and two rigorously validated alternative parts with documented functional and application-level differences.
Technical Context
The AMT49406GESSR implements a fully integrated, code-free FOC algorithm that dynamically estimates rotor position using back-EMF sensing without Hall sensors, enabling high-efficiency commutation across variable loads and speeds. Its startup logic handles stationary, windmill, and reverse-windmill conditions while enforcing directional integrity via configurable A→B→C or A→C→B phase sequencing.
Motor speed is controlled via SPD pin with three selectable modes-Analog (0.05–2.5 V), PWM (80 Hz–100 kHz), or CLOCK (1–2000 Hz)-all supporting optional closed-loop regulation with ±5% accuracy in PWM/Analog mode and ±0.1 rpm in CLOCK mode. The I²C interface (7-bit address 0x55) allows runtime reconfiguration of EEPROM-stored parameters including rated current (programmable up to ~10 A via external shunt), resistance, inductance, PID gains, and brake thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5.5 V to 48 V operating; 50 V absolute max - supports wide-input 12/24/48 V DC fan and pump supplies. |
| Motor Control Algorithm | Integrated sensorless field-oriented control (FOC) - enables >90% efficiency and low acoustic noise without external position sensors. |
| Speed Input Modes | Analog (0.05–2.5 V), PWM (80 Hz–100 kHz), CLOCK (1–2000 Hz) - flexible interface compatibility with MCU, potentiometer, or oscillator sources. |
| Closed-Loop Accuracy | ±5% in PWM/Analog mode; ±0.1 rpm in CLOCK mode - ensures precise RPM regulation under load variation. |
| Thermal Protection | Thermal shutdown at 165°C with 20°C hysteresis - prevents latch-up during sustained overload or poor heatsinking. |
| Current Sensing | Differential bus sensing via SENP/SENN pins with ≤65 mV full-scale - enables accurate 1.3× rated current limiting using Kelvin-shunt resistors. |
| I²C Interface | 7-bit address 0x55; supports EEPROM programming of 24 registers - allows production-line calibration and field updates without firmware changes. |
Pinout & Package
AMT49406GESSR is housed in a 24-contact, 4 mm × 4 mm × 0.75 mm QFN package with exposed thermal pad (ES suffix), rated for –40°C to +105°C ambient operation and offering 45°C/W junction-to-ambient thermal resistance on a 2-layer PCB with 1-in² copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–24, PAD | Physical terminals and thermal pad | PAD is electrically connected to GND and must be soldered to PCB ground plane for thermal and EMI performance. |
| CP1, CP2, VCP | Charge pump circuitry | Generate boosted gate drive voltage (VCP ≈ VBB + 6.5 V) to fully enhance external N-channel high-side MOSFETs. |
| GHx, GLx (A/B/C) | High-/low-side gate drive outputs | Drive external 3-phase inverter bridge; GHx sourced from VCP, GLx referenced to LSS for bootstrap-independent low-side control. |
| SENP, SENN | Differential current sense inputs | Accept ≤65 mV differential signal from shunt resistor to enable FOC torque estimation and overcurrent protection. |
| SPD, DIR, BRAKE | Control logic inputs | SPD accepts analog/PWM/CLOCK speed demand; DIR sets phase sequence (A→B→C or A→C→B); BRAKE forces active-low braking. |
| FAULT, FG, VREG | Status, feedback, and regulation outputs | FAULT is open-drain fault indicator with LED-coded diagnostics; FG outputs tach pulses; VREG supplies 2.8 V @ 10 mA for external bias. |
Key Features
| Feature | Design Value |
|---|---|
| Code-free sensorless FOC | Eliminates need for position sensors or motor-specific firmware development - reduces BOM count and system integration time. |
| Proprietary non-reverse fast startup | Starts motor directly in target direction without reverse shake - critical for fan applications where audible vibration is unacceptable. |
| Soft-On Soft-Off (SOSO) | Gradually ramps phase current at startup and shutdown - cuts acoustic noise by >15 dB(A) and reduces mechanical stress on bearings and blades. |
| Configurable current limit | Programmable peak phase current limit set to 1.3× rated current - protects MOSFETs and motor windings during acceleration or stall. |
| Windmill & reverse-windmill startup | Detects and synchronizes to pre-rotating rotors - enables reliable restart in ventilation systems with airflow-induced blade rotation. |
| Lock detection with auto-restart | Monitors BEMF zero-crossing failure and disables drive for configurable tLOCK before retry - prevents thermal runaway during jammed-rotor conditions. |
Applications
| Ceiling Fans | Pedestal Fans |
|---|---|
|
Use Scenario: Variable-speed residential ceiling fan with quiet, smooth acceleration and no reverse jerk at power-on. IC Role / Device Role / Timing Role: Sensorless FOC gate driver executing real-time torque vectoring and closed-loop RPM regulation via SPD analog input. Use Value: Enables <15 dB(A) acoustic noise at full speed and eliminates user-perceived "shudder" during startup - meeting ENERGY STAR® and Quiet Home certification requirements. |
Use Scenario: Oscillating pedestal fan requiring direction reversal while rotating and stable low-speed operation down to 100 RPM. IC Role / Device Role / Timing Role: Motor controller managing bidirectional commutation, dynamic braking via BRAKE pin, and windmill-resilient startup. Use Value: Supports seamless direction reversal under load and maintains ±3% speed stability at 100–1200 RPM - improving user experience and reducing mechanical wear. |
| Bathroom Exhaust Fans | Home Appliance Pumps |
|
Use Scenario: Humidity-triggered exhaust fan that starts instantly upon airflow demand and operates silently in occupied spaces. IC Role / Device Role / Timing Role: Low-noise BLDC driver using SOSO and non-reverse startup, controlled via PWM from microcontroller. Use Value: Achieves <20 dB(A) idle noise and <30 dB(A) full-load noise - satisfies building codes for residential bathroom acoustics. |
Use Scenario: Condensate removal pump in HVAC systems requiring reliable dry-run protection and consistent flow rate across voltage dips. IC Role / Device Role / Timing Role: Closed-loop speed controller monitoring FG tach output and adjusting drive to maintain constant flow despite inlet pressure variation. Use Value: Delivers ±2% flow rate stability over 10–48 V supply range and detects stalled impeller via lock detection - preventing overheating and system failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BLDC gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP6532GQ-Z | 3-phase gate driver only - no integrated FOC, no I²C, no closed-loop speed control; requires external MCU for commutation logic. | Suitable for cost-sensitive designs where FOC is implemented externally; lacks SOSO, windmill startup, and analog/PWM/CLOCK flexibility. | Select MP6532GQ-Z only when full motor control firmware resides on host MCU and acoustic noise is not a primary requirement. |
| STSPIN32F0601TR | Integrated 64 MHz ARM Cortex-M0+ MCU + 3-phase gate driver + hardware FOC engine; supports Hall/sensorless modes; requires custom firmware. | Enables advanced features like field weakening and multi-motor coordination but increases design complexity and validation effort. | Choose STSPIN32F0601TR when application demands programmable motion profiles, dual-motor control, or integration with existing STM32 ecosystem. |
Compared with MP6532GQ-Z and STSPIN32F0601TR, the AMT49406GESSR uniquely delivers production-ready, code-free FOC with factory-programmable parameters - eliminating MCU dependency while providing superior acoustic performance and faster time-to-market for fan and pump OEMs.
Availability
AMT49406GESSR is available at Aetrix Electronics and suitable for ceiling fans, pedestal fans, and bathroom exhaust systems requiring stable component supply, long-term lifecycle support, and automotive-grade reliability in consumer and industrial environments.
Supply support for AMT49406GESSR 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, with over 40 years of innovation in motion control and energy-efficient power management.
The AMT49406GESSR belongs to Allegro's AMT family of intelligent BLDC controllers, designed specifically for ultra-quiet, high-efficiency fan and pump applications in residential, commercial, and HVAC markets - prioritizing acoustic performance, startup robustness, and ease of system integration.
FAQ
What is the maximum continuous motor supply voltage supported by the AMT49406GESSR?
The AMT49406GESSR supports a continuous operating supply voltage range of 5.5 V to 48 V, with an absolute maximum rating of 50 V on the VBB pin. Exceeding 48 V during normal operation risks violating the recommended operating conditions and may trigger VBB UVLO (4.75–4.95 V hysteresis) or reduce long-term reliability. The 50 V rating applies only to transient spikes per the Absolute Maximum Ratings table.
Does the AMT49406GESSR require external microcontroller firmware to operate its FOC algorithm?
No, the AMT49406GESSR implements a fully integrated, code-free field-oriented control (FOC) algorithm. All commutation logic, rotor position estimation, and torque control are handled internally - no external MCU firmware is required for basic operation. Configuration is done via I²C writes to EEPROM registers (e.g., rated current, resistance, speed), not real-time code execution.
How does the AMT49406GESSR handle motor startup under windmill conditions?
The AMT49406GESSR detects pre-rotation via back-EMF monitoring on SENP/SENN and automatically synchronizes commutation to the existing rotor position. It supports both standard windmill and reverse-windmill startup - ensuring reliable restart even when blades are rotating backward due to airflow, without requiring mechanical brakes or forced stopping.
Can the AMT49406GESSR drive both N-channel and P-channel high-side MOSFETs?
The AMT49406GESSR is optimized for N-channel high-side MOSFETs using its integrated charge pump (CP1/CP2/VCP). It does not support direct drive of P-channel high-side devices. The GHx outputs source current from VCP (≈ VBB + 6.5 V), which is necessary to fully enhance standard N-channel MOSFETs; driving P-channel devices would require inverted logic and external level-shifting not provided by the AMT49406GESSR.
What fault conditions does the FAULT pin indicate, and how are they encoded?
The FAULT pin on the AMT49406GESSR is an open-drain output that encodes six distinct fault types via LED flash patterns: lock detection (constant ON), overcurrent (slow flashing), overtemperature (long-short-short), system error (double short), overvoltage (fast flashing), and zero-speed demand (long-short). Each pattern uses specific high/low timing sequences defined in the datasheet, enabling simple visual diagnostics without additional circuitry.
AMT49406GESSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-WFQFN 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-QFN (4x4)
AMT49406GESSR FAQ
1.How can I place an order for AMT49406GESSR through Aetrix?
Please submit a Request for Quotation (RFQ) for AMT49406GESSR 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 AMT49406GESSR reliable?
The price and inventory of AMT49406GESSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AMT49406GESSR is usually 5 days.
3.What payment methods are accepted for AMT49406GESSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AMT49406GESSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AMT49406GESSR?
AMT49406GESSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AMT49406GESSR 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 AMT49406GESSR?
For technical support, including AMT49406GESSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AMT49406GESSR requirements.
6.How does Aetrix verify that AMT49406GESSR is sourced from the original manufacturer or authorized distributors?
All AMT49406GESSR 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 AMT49406GESSR meets industry standards.
7.What is the process for return or replacement of AMT49406GESSR?
All AMT49406GESSR units undergo pre-shipment inspection (PSI). If there is an issue with AMT49406GESSR, 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 AMT49406GESSR part is unused and in its original packaging.
Return procedure for AMT49406GESSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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