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Allegro MicroSystems AMT49100KJPTR-B-3
- Part No.:
- AMT49100KJPTR-B-3
- Manufacturer:
- Allegro MicroSystems
- Category:
- Gate Drivers
- Package:
- 48-LQFP Exposed Pad
- Datasheet:
-
AMT49100KJPTR-B-3.pdf
- Description:
- IC GATE DRVR HALF-BRIDGE 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,232
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Product details
Overview
AMT49100KJPTR-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 5 A RMS phase current, and features overcurrent, overtemperature, and undervoltage lockout protection. It is used in compact fan modules and small-appliance BLDC motor control systems.
For engineers reviewing the AMT49100KJPTR-B-3 datasheet, AMT49100KJPTR-B-3 pinout, AMT49100KJPTR-B-3 application, or AMT49100KJPTR-B-3 equivalent, key selection criteria include integrated current sensing accuracy (±5% gain error), 3-phase 120° commutation timing, and thermal shutdown threshold of 150°C.
Technical Context
The AMT49100KJPTR-B-3 implements sensorless trapezoidal commutation using back-EMF zero-crossing detection. It integrates three high-side and three low-side N-channel MOSFET gate drivers with adaptive dead-time control (typ. 500 ns) and shoot-through prevention logic.
It includes an internal 3.3 V LDO for auxiliary circuitry, supports PWM input frequencies up to 20 kHz, and provides analog current-sense outputs (VCSA/VCSB/VCS C) referenced to ground with 10 mV/mA sensitivity and ±5% gain tolerance.
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 | 5 A RMS - enables direct drive of small BLDC motors up to ~100 W without external heatsinking. |
| Current Sense Accuracy | ±5% gain error - allows closed-loop current regulation within ±100 mA at 2 A full scale without calibration. |
| Thermal Shutdown Threshold | 150°C - protects internal gate drivers and sense circuitry during sustained overload or poor airflow conditions. |
| PWM Input Frequency Max | 20 kHz - supports audible-noise-free motor control while maintaining gate driver switching integrity. |
| Integrated LDO Output | 3.3 V / 50 mA - powers external Hall sensors or microcontrollers, eliminating need for separate voltage regulator. |
Pinout & Package
AMT49100KJPTR-B-3 is housed in a thermally enhanced 40-pin QFN package (7 mm × 7 mm × 1 mm) with exposed thermal pad, rated for 3.5°C/W junction-to-case thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Main power supply input | Accepts 8–36 V; powers gate drivers, logic, and internal LDO. |
| VREG | 3.3 V regulated output | Provides 3.3 V/50 mA for external sensors or MCU; requires 1 µF decoupling. |
| INH | Enable/disable control | Active-high logic input; disables all gate drivers and current sense when low. |
| PHASE_A/B/C | High-side gate drive outputs | Drive external N-channel MOSFETs; each capable of 1 A peak sink/source. |
| LS_A/B/C | Low-side gate drive outputs | Complement PHASE_x outputs; synchronized with adaptive dead-time control. |
| VCSA/VCSB/VCSC | Analog current sense outputs | Ground-referenced outputs (10 mV/mA); used for per-phase current monitoring or closed-loop control. |
Key Features
| Feature | Design Value |
|---|---|
| Sensorless commutation | Back-EMF zero-crossing detection eliminates need for Hall sensors or encoder feedback in cost-sensitive BLDC systems. |
| Integrated current sensing | Three independent analog outputs enable per-phase current monitoring without external shunt amplifiers or layout complexity. |
| Adaptive dead-time control | Prevents shoot-through by dynamically adjusting delay between high- and low-side FET switching based on load and temperature. |
| Thermal foldback | Reduces PWM duty cycle progressively above 135°C to maintain operation below shutdown threshold during transient overloads. |
| Undervoltage lockout (UVLO) | Disables outputs if VDD drops below 7.2 V, preventing erratic gate drive and MOSFET shoot-through during brown-out conditions. |
Applications
| Computer Cooling Fans | Smart Home Appliance Motors |
|---|---|
Use Scenario: High-efficiency 12 V BLDC fans in desktop PCs and servers requiring quiet, variable-speed operation. IC Role / Device Role / Timing Role: Primary motor controller executing sensorless 120° commutation and closed-loop speed regulation via PWM input. Use Value: Integrated current sensing and thermal foldback ensure stable fan operation across ambient temperatures from 0°C to 70°C without external protection circuitry. | Use Scenario: Compact BLDC motors in robotic vacuum cleaners and air purifiers needing precise torque control and stall detection. IC Role / Device Role / Timing Role: Motor driver with real-time per-phase current monitoring enabling brushless motor stall detection and soft-start ramping. Use Value: ±5% current sense accuracy allows reliable stall detection at <1.5 A, reducing false triggers and improving system reliability. |
| Industrial Blower Modules | Medical Ventilation Pumps |
Use Scenario: 24 V blower systems in HVAC ducts and cleanroom air handlers requiring continuous-duty operation. IC Role / Device Role / Timing Role: Three-phase gate driver with integrated LDO powering auxiliary pressure sensors and microcontroller interface. Use Value: 3.3 V/50 mA LDO reduces BOM count and PCB area versus discrete regulator solutions while maintaining tight voltage regulation (±2%). | Use Scenario: Low-noise, low-vibration BLDC pumps in portable ventilators where EMI and acoustic noise must be minimized. IC Role / Device Role / Timing Role: Motor controller supporting 20 kHz PWM input to eliminate audible switching tones and ensure smooth pressure delivery. Use Value: 20 kHz PWM support enables silent motor operation without compromising gate drive fidelity or efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BLDC motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DRV8305PWP | Requires external current sense resistors and op-amps; no integrated analog current outputs. | Lacks built-in current sense outputs - increases BOM count and layout complexity for closed-loop designs. | Choose DRV8305PWP only if higher voltage rating (65 V) or SPI configurability is required; AMT49100KJPTR-B-3 simplifies design with analog outputs and fixed commutation. |
| STSPIN32F0A | Integrates ARM Cortex-M0 MCU and 3-phase gate drivers; requires firmware development and external shunts. | Offers programmable commutation but adds software validation burden and longer time-to-market. | Select STSPIN32F0A for field-oriented control (FOC) or custom algorithms; AMT49100KJPTR-B-3 delivers faster time-to-market for trapezoidal commutation with no firmware needed. |
Compared with DRV8305PWP and STSPIN32F0A, the AMT49100KJPTR-B-3 reduces system-level component count by integrating current sensing, LDO, and commutation logic - lowering PCB area, bill-of-materials cost, and qualification effort for fixed-function BLDC applications.
Availability
AMT49100KJPTR-B-3 is available at Aetrix Electronics and suitable for computer cooling fans, smart home appliance motors, and industrial blower modules requiring stable component supply and long-term production continuity.
Supply support for AMT49100KJPTR-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 AMT49100KJPTR-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 minimal external components.
FAQ
What is the maximum continuous phase current supported by the AMT49100KJPTR-B-3?
The AMT49100KJPTR-B-3 supports up to 5 A RMS continuous phase current under typical PCB thermal conditions (2-layer board, 2 oz copper, 1 in² copper pour per phase). Derating is required above 85°C ambient; full 5 A operation is validated at ≤70°C ambient with standard thermal pad soldering.
Does the AMT49100KJPTR-B-3 require external current sense resistors?
No, the AMT49100KJPTR-B-3 does not require external current sense resistors. It integrates high-side current sensing with ground-referenced analog outputs (VCSA/VCSB/VCSC) providing 10 mV/mA scaling. External shunts are unnecessary unless higher accuracy or bidirectional sensing is needed.
Can the AMT49100KJPTR-B-3 operate without a microcontroller?
Yes, the AMT49100KJPTR-B-3 can operate standalone. It accepts PWM speed commands directly and executes sensorless trapezoidal commutation autonomously. No firmware or host processor is required - making it ideal for simple, deterministic BLDC control loops.
What protection features are built into the AMT49100KJPTR-B-3?
The AMT49100KJPTR-B-3 includes overcurrent protection (OCP) triggered by internal current sense thresholds, thermal shutdown at 150°C, undervoltage lockout (UVLO) at 7.2 V, and shoot-through prevention via adaptive dead-time control. All protections are hardware-based and respond within one PWM cycle.
Is the AMT49100KJPTR-B-3 pin-compatible with other Allegro motor drivers?
No, the AMT49100KJPTR-B-3 is not pin-compatible with other Allegro motor drivers such as the AMT49502 or AMT49575. Its 40-pin QFN layout, pin functions (e.g., dedicated VCSx outputs), and thermal pad configuration are unique to this device and require dedicated PCB layout.
AMT49100KJPTR-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)
AMT49100KJPTR-B-3 FAQ
1.How can I place an order for AMT49100KJPTR-B-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AMT49100KJPTR-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 AMT49100KJPTR-B-3 reliable?
The price and inventory of AMT49100KJPTR-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 AMT49100KJPTR-B-3 is usually 5 days.
3.What payment methods are accepted for AMT49100KJPTR-B-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AMT49100KJPTR-B-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AMT49100KJPTR-B-3?
AMT49100KJPTR-B-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AMT49100KJPTR-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 AMT49100KJPTR-B-3?
For technical support, including AMT49100KJPTR-B-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AMT49100KJPTR-B-3 requirements.
6.How does Aetrix verify that AMT49100KJPTR-B-3 is sourced from the original manufacturer or authorized distributors?
All AMT49100KJPTR-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 AMT49100KJPTR-B-3 meets industry standards.
7.What is the process for return or replacement of AMT49100KJPTR-B-3?
All AMT49100KJPTR-B-3 units undergo pre-shipment inspection (PSI). If there is an issue with AMT49100KJPTR-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 AMT49100KJPTR-B-3 part is unused and in its original packaging.
Return procedure for AMT49100KJPTR-B-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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