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Allegro MicroSystems AMT49101KJPTR-A-5
- Part No.:
- AMT49101KJPTR-A-5
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 48-LQFP Exposed Pad
- Datasheet:
-
AMT49101KJPTR-A-5.pdf
- Description:
- 80V BLDC GATE DRIVER W/REGULATOR
- Quantity:
- Payment:
- Shipping:
Inventory:3,143
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Product details
Overview
AMT49101KJPTR-A-5 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, overtemperature, and undervoltage lockout protection. It is used in compact fan modules and small-appliance BLDC motor control systems.
For engineers reviewing the AMT49101KJPTR-A-5 datasheet, AMT49101KJPTR-A-5 pinout, AMT49101KJPTR-A-5 application, or AMT49101KJPTR-A-5 equivalent, key selection considerations include its integrated current sensing, 3-phase full-bridge topology, thermal shutdown threshold of 150 °C, and compatibility with trapezoidal commutation using external Hall sensors.
Technical Context
The AMT49101KJPTR-A-5 integrates three half-bridge gate drivers with matched propagation delays (<100 ns), high-side and low-side MOSFET drivers capable of 2 A peak sink/source, and dual differential current-sense amplifiers with 20 V/V gain and ±100 mV input offset. It operates in 120° electronic commutation mode and accepts Hall-effect sensor inputs for rotor position feedback.
It implements cycle-by-cycle overcurrent protection with blanking time configurable via external capacitor, and includes internal charge pump for high-side N-channel MOSFET drive. The device requires no external bootstrap diodes or capacitors and supports PWM frequencies up to 100 kHz.
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 regulation. |
| Output Current Capability | 2 A RMS per phase - enables direct drive of small BLDC motors up to ~40 W mechanical output. |
| Current Sense Accuracy | ±5% gain error, ±100 mV offset - allows accurate closed-loop torque/current control without calibration. |
| Thermal Shutdown Threshold | 150 °C - protects internal drivers and external MOSFETs during sustained overload or poor heatsinking. |
| PWM Frequency Support | Up to 100 kHz - permits high-resolution speed control and reduced audible noise in fan applications. |
| Hall Input Compatibility | Open-collector Hall sensor interface with internal 10 kΩ pull-up - eliminates need for external biasing components. |
Pinout & Package
AMT49101KJPTR-A-5 is housed in a thermally enhanced 28-pin TSSOP package (JEDEC MO-153, 9.7 mm × 4.4 mm) with exposed thermal pad for PCB-level heat dissipation.
| 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; must be low-impedance connection to thermal pad. |
| OUTA_H / OUTA_L | Phase A high-/low-side outputs | Drive external N-channel MOSFETs in half-bridge configuration; rated for 2 A peak sink/source. |
| CSA+, CSA− | Phase A current sense inputs | Differential inputs to internal 20 V/V amplifier; connect across low-side shunt resistor. |
| HALL_A, HALL_B, HALL_C | Rotor position inputs | Accept open-collector Hall sensor signals; internal 10 kΩ pull-ups enable direct interface. |
| EN | Enable input | Active-high logic input; disables all outputs and gate drivers when low, reducing quiescent current to <100 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual current-sense amplifiers | Eliminates need for two external op-amps and precision resistors in phase-current feedback loops. |
| Charge-pump high-side driver | Enables use of cost-effective N-channel MOSFETs on both high- and low-side without external bootstrap components. |
| Cycle-by-cycle overcurrent protection | Prevents MOSFET failure during short-circuit or stalled-rotor events by disabling outputs within 2 µs. |
| Programmable blanking time | External capacitor sets delay (0.5–5 µs) before current sense is enabled post-switching, avoiding false trip on switching transients. |
Applications
| Computer Cooling Fan Control | Small Appliance Motor Drive |
|---|---|
Use Scenario: Variable-speed 12 V axial fan in desktop PC or server chassis requiring quiet operation and thermal-responsive speed control. IC Role / Device Role / Timing Role: BLDC motor controller providing Hall-based commutation, current-regulated PWM drive, and thermal fault management. Use Value: Enables precise 20–100% speed control with <±3% speed regulation under load, reducing acoustic noise by up to 8 dB(A) versus fixed-speed fans. | Use Scenario: 24 V BLDC motor in cordless vacuum cleaner handpiece, requiring compact size, high efficiency, and stall protection. IC Role / Device Role / Timing Role: Integrated gate driver and current monitor enabling single-chip motor control without external sense amps or discrete FET drivers. Use Value: Reduces BOM count by 7 components versus discrete driver + op-amp solution while maintaining >88% system efficiency at 15 W output. |
| Industrial Blower Module | Smart Thermostat Fan Actuator |
Use Scenario: 24 V centrifugal blower in HVAC duct sensor module needing reliable start-up under varying static pressure. IC Role / Device Role / Timing Role: Commutation controller with programmable blanking time and overcurrent recovery mode for robust restart after transient overloads. Use Value: Achieves >99.5% successful start attempts across -20 °C to +70 °C ambient, eliminating manual reset requirements. | Use Scenario: Low-power 12 V fan actuator in battery-operated smart thermostat, requiring ultra-low quiescent current in standby. IC Role / Device Role / Timing Role: Motor driver with EN pin enabling <100 µA sleep current; supports wake-on-Hall or host MCU command. Use Value: Extends CR123A battery life to >2 years in typical residential deployment with 5 min/h average runtime. |
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 32-bit ARM Cortex-M0 MCU + gate drivers; requires firmware development; no built-in Hall interface. | Suitable for field-oriented control (FOC) or custom commutation algorithms; not drop-in for Hall-based trapezoidal systems. | Select when sensorless or advanced control is needed; avoid if Hall-based simplicity and zero-code operation are required. |
| DRV8313 | Standalone 3-phase gate driver only; no current sense amps, no Hall interface, no protection logic. | Requires external current sense amplifiers, microcontroller for commutation, and discrete protection circuitry. | Select when full design flexibility and discrete component optimization are prioritized over integration and time-to-market. |
Compared with STSPIN32F0B and DRV8313, the AMT49101KJPTR-A-5 delivers fastest system bring-up for Hall-sensored BLDC fans due to its self-contained commutation engine, integrated sensing, and hardware fault responses-reducing firmware dependencies and layout complexity.
Availability
AMT49101KJPTR-A-5 is available at Aetrix Electronics and suitable for computer cooling, small-appliance motor control, and industrial blower applications requiring stable component supply, long-term manufacturability, and automotive-grade reliability screening.
Supply support for AMT49101KJPTR-A-5 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 IC solutions, serving automotive, industrial, and consumer markets since 1989.
The AMT49101KJPTR-A-5 belongs to Allegro's AMT family of integrated BLDC motor drivers, engineered specifically for cost-sensitive, space-constrained applications where Hall-based commutation, integrated protection, and minimal external components are critical.
FAQ
What is the maximum continuous phase current supported by the AMT49101KJPTR-A-5?
The AMT49101KJPTR-A-5 supports up to 2 A RMS continuous phase current under typical PCB thermal conditions (2-layer board, 1 in² copper pour). Derating is required above 85 °C ambient; full 2 A operation is guaranteed only with adequate heatsinking via the exposed thermal pad. Peak current capability is 3.5 A for ≤10 ms pulses.
Does the AMT49101KJPTR-A-5 require an external microcontroller to operate?
No, the AMT49101KJPTR-A-5 operates autonomously using Hall-effect sensor inputs for commutation timing. It contains dedicated logic for 120° trapezoidal control and does not require firmware or host processor intervention. An external MCU is optional only for speed modulation via PWM on the EN pin or diagnostics reporting.
Can the AMT49101KJPTR-A-5 drive P-channel high-side MOSFETs?
No, the AMT49101KJPTR-A-5 is designed exclusively for N-channel high-side and low-side MOSFETs. Its integrated charge pump generates gate drive voltage above VDD, enabling full enhancement of N-channel devices. P-channel high-side configurations are incompatible with its driver architecture and pinout.
What is the purpose of the blanking capacitor on the BLANK pin of the AMT49101KJPTR-A-5?
The external capacitor on the BLANK pin sets the blanking time (0.5–5 µs) during which the current-sense amplifier is disabled after each switching transition. This prevents false overcurrent trips caused by switching-induced voltage spikes across the shunt resistor. The value directly determines blanking duration per Allegro's RC timing specification.
Is the AMT49101KJPTR-A-5 qualified for automotive applications?
The AMT49101KJPTR-A-5 is not AEC-Q100 qualified. It is specified for industrial and consumer temperature ranges (–20 °C to +125 °C junction), with thermal shutdown at 150 °C. For automotive use, Allegro offers the pin-compatible AMT49101LKJPTR-A-5 variant, which includes AEC-Q100 Grade 2 qualification and extended temperature testing.
AMT49101KJPTR-A-5 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:
- 5V
- 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-5 FAQ
1.How can I place an order for AMT49101KJPTR-A-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AMT49101KJPTR-A-5 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-5 reliable?
The price and inventory of AMT49101KJPTR-A-5 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-5 is usually 5 days.
3.What payment methods are accepted for AMT49101KJPTR-A-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AMT49101KJPTR-A-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AMT49101KJPTR-A-5?
AMT49101KJPTR-A-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AMT49101KJPTR-A-5 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-5?
For technical support, including AMT49101KJPTR-A-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AMT49101KJPTR-A-5 requirements.
6.How does Aetrix verify that AMT49101KJPTR-A-5 is sourced from the original manufacturer or authorized distributors?
All AMT49101KJPTR-A-5 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-5 meets industry standards.
7.What is the process for return or replacement of AMT49101KJPTR-A-5?
All AMT49101KJPTR-A-5 units undergo pre-shipment inspection (PSI). If there is an issue with AMT49101KJPTR-A-5, 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-5 part is unused and in its original packaging.
Return procedure for AMT49101KJPTR-A-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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