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Allegro MicroSystems A5936GLNTR-T
- Part No.:
- A5936GLNTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 10-SOP (0.154", 3.90mm Width)
- Datasheet:
-
A5936GLNTR-T.pdf
- Description:
- IC MOTOR DRIVER 10SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,603
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Product details
Overview
A5936GLNTR-T from Allegro MicroSystems is a discontinued three-phase sensorless sinusoidal fan driver IC designed for low-noise, low-vibration cooling in desktop, server, and industrial blowers. It delivers 1.25 Ω total RDS(on), supports 4–16 V VBB, operates across –40°C to 105°C, and implements quiet startup with soft acceleration and lock detection - enabling silent fan operation in thermal management systems.
For engineers reviewing the A5936GLNTR-T datasheet, A5936GLNTR-T pinout, A5936GLNTR-T application, or A5936GLNTR-T equivalent, key selection considerations include its 10-lead SSOP package, PWM speed control interface (0.1–100 kHz), FG tach output, ACC/DMD-configurable startup parameters, and integrated protection including OCP, UVLO, and thermal shutdown.
Technical Context
The A5936GLNTR-T uses BEMF-based rotor position sensing on phase A to generate synchronized 120°-phase sinusoidal PWM drive without Hall sensors. Its 9-bit duty-cycle measurement engine converts input PWM into demand values that shape motor current waveforms dynamically across speeds.
Startup sequencing includes open-loop sine ramping at 812 mHz, frequency acceleration over 1.6 s, and transition to closed-loop position sensing with 500 ms synchronization hold. Protection logic monitors output current, junction temperature (TJ = 150–180°C trip), and VBB (UVLO at 4.7 V rising) with auto-restart after 5 s lock-off delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBB Range | 4 V to 16 V - enables compatibility with legacy 5 V and modern 12 V fan rails |
| RDS(on) Total | 1.25 Ω max at 25°C - limits conduction loss and self-heating during continuous 1 A motor drive |
| PWM Input Frequency | 0.1–100 kHz - allows flexible MCU or dedicated PWM generator interfacing without external dividers |
| FG Output | Open-drain, one pulse per electrical revolution - provides direct RPM feedback to host controller with <0.3 V saturation |
| Overcurrent Limit | 1.5–3 A - protects MOSFETs and motor windings against stall or short-circuit faults |
| Thermal Shutdown | 150–180°C with 35°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking |
| Standby Current | <1 µA - reduces system power draw when fan is inactive via PWM pin hold-low |
Pinout & Package
A5936GLNTR-T is housed in a 10-lead SSOP (Small Outline Package) with gull-wing leads, Pb-free matte-tin plating, and no exposed thermal pad - distinct from the eSOIC-LK variant. Thermal resistance RθJA is 100°C/W on a 2-sided PCB with 1 in² copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM | Logic input | Speed demand signal; duty cycle measured and converted to 9-bit demand value; enables motor if >10% DC_ON |
| FG | Logic output | Open-drain tachometer output; toggles once per electrical revolution for RPM monitoring |
| VBB | Power supply input | Main motor driver supply rail; UVLO active between 3.85–4.9 V; supports 4–16 V operation |
| OUTA / OUTB / OUTC | Motor phase outputs | Three half-bridge outputs driving BLDC fan windings with sinusoidal PWM modulation |
| GND | Ground reference | Common return for power, logic, and analog circuits; must be low-impedance for noise immunity |
| VREF | Analog reference | 2.9 V ±50 mV output; powers internal A/D and startup parameter lookup table |
| DMD | Logic input | Startup configuration select (HI/LO); determines initial VINIT voltage during open-loop ramp |
| ACC | Analog input | 0–2.95 V input selecting acceleration rate and max frequency via resistor divider lookup table |
Key Features
| Feature | Design Value |
|---|---|
| Sensorless sinusoidal drive | Eliminates Hall sensors and reduces EMI/noise by generating smooth current waveforms without commutation spikes |
| Quiet startup sequence | Combines 812 mHz sine initialization, 1.6 s frequency ramp, and 500 ms sync hold to prevent audible thump or vibration at turn-on |
| Configurable acceleration | 16 startup profiles selected via ACC voltage divider - enables tuning for diverse fan inertia and load characteristics |
| Integrated protection suite | Lock detection (5 s auto-restart), overcurrent limit (1.5–3 A), UVLO (4.7 V), and thermal shutdown (150–180°C) reduce need for external fault circuitry |
| Low-power standby mode | Draws <1 µA when PWM held low; VREF disabled to minimize quiescent consumption in idle systems |
Applications
| Server CPU Cooling | Industrial Blower Control |
|---|---|
|
Use Scenario: High-reliability 12 V fans in rack-mounted servers requiring acoustic compliance and thermal stability under variable load. IC Role / Device Role / Timing Role: Three-phase motor driver executing sensorless sinusoidal commutation with FG-based closed-loop speed regulation. Use Value: Reduces audible noise by >15 dB vs. trapezoidal drivers and eliminates mechanical wear from Hall sensor failure in 24/7 operation. |
Use Scenario: Dust-resistant blowers in factory automation enclosures where fan startup must avoid torque shock to mounted sensors or optics. IC Role / Device Role / Timing Role: Fan controller managing acceleration profile, lock recovery, and thermal margin via ACC/DMD configuration and TJ monitoring. Use Value: Prevents mechanical resonance during startup using programmable 0–500 Hz/s acceleration rates and soft-start demand ramping. |
| Desktop PC Chassis Fans | Medical Equipment Ventilation |
|
Use Scenario: Low-profile 5 V chassis fans in compact PCs where board space and EMI are constrained. IC Role / Device Role / Timing Role: Compact motor driver delivering full-speed control via PWM input and tach feedback without external gate drivers or sense resistors. Use Value: Achieves 4 V minimum operation and integrates all drive, sensing, and protection functions in 10-pin SSOP - reducing BOM count by ≥7 components. |
Use Scenario: Fan-cooled diagnostic imaging devices requiring fail-safe thermal management and silent operation near patients. IC Role / Device Role / Timing Role: Safety-aware fan actuator with thermal shutdown, lock detection, and standby mode to maintain airflow integrity during low-duty cycles. Use Value: Guarantees automatic restart after lock condition and maintains <1 µA standby draw to support battery-backed ventilation modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar three-phase sensorless fan driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP6532GQ-Z | Higher RDS(on) (1.8 Ω), no ACC/DMD startup tuning, fixed 24 kHz PWM output | Lacks configurable acceleration and quiet startup sequence; suited for cost-sensitive, non-acoustic applications | Choose MP6532GQ-Z only if startup noise is not critical and layout space permits larger thermal solution for higher conduction loss |
| DRV10983ZRTVT | Integrated 12-bit ADC for analog speed control, lower IQ (2.5 µA), but requires external bootstrap capacitors | Supports analog voltage speed command and offers finer speed resolution, yet increases external component count | Select DRV10983ZRTVT when analog interface is preferred and design can accommodate additional passive components and layout area |
Compared with MP6532GQ-Z and DRV10983ZRTVT, the A5936GLNTR-T uniquely combines programmable startup profiles, sub-1 µA standby, and integrated FG tach in a leaded SSOP - making it optimal for acoustic-sensitive, space-constrained fan designs despite discontinuation status.
Availability
A5936GLNTR-T is available at Aetrix Electronics and suitable for server cooling, industrial blower control, desktop chassis fans, and medical ventilation systems requiring stable component supply during last-time-buy and legacy production phases.
Supply support for A5936GLNTR-T 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 of high-performance magnetic sensing and power IC solutions, specializing in motion control, energy efficiency, and reliability-critical semiconductor systems.
The A5936 product line was developed specifically for ultra-quiet, sensorless BLDC fan control in computing and industrial thermal management - emphasizing low acoustic noise, robust lock recovery, and minimal external component count.
FAQ
Is A5936GLNTR-T still in production?
No, the A5936GLNTR-T is officially discontinued as of September 13, 2024. Allegro MicroSystems has ceased manufacturing and no longer offers samples. Aetrix Electronics maintains limited legacy stock for last-time-buy requirements and ongoing maintenance of deployed systems.
What is the package type and pin count of A5936GLNTR-T?
The A5936GLNTR-T uses a 10-lead SSOP (Small Outline Package) with gull-wing leads and no exposed thermal pad. Its pinout matches the LN suffix variant described in Allegro's A5936-DS Rev. 6, including dedicated PWM, FG, VBB, OUTA/B/C, GND, VREF, DMD, and ACC terminals.
How does A5936GLNTR-T achieve quiet fan startup?
The A5936GLNTR-T achieves quiet startup through a six-stage sequence: slow sine-wave initialization at 812 mHz, 1.6-second frequency ramp, position-sensing transition, 500-ms synchronization hold, and controlled duty ramp. This avoids torque shock and minimizes audible vibration during fan turn-on.
Can A5936GLNTR-T operate from a 5 V supply?
Yes, the A5936GLNTR-T supports VBB from 4 V to 16 V, making it fully compatible with standard 5 V fan rails. Its UVLO threshold is 4.7 V (rising) and 3.85 V (falling), ensuring reliable enable/disable behavior within typical 5 V tolerance bands.
What protection features are integrated into A5936GLNTR-T?
The A5936GLNTR-T integrates lock detection with 5-second auto-restart, overcurrent limiting (1.5–3 A), VBB undervoltage lockout (4.7 V rising), thermal shutdown (150–180°C), and short-circuit protection on motor outputs - eliminating the need for discrete protection circuitry in most fan applications.
A5936GLNTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 10-SOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Motor Type - Stepper:
- Multiphase
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Driver
- Output Configuration:
- -
- Interface:
- -
- Technology:
- -
- Step Resolution:
- -
- Applications:
- General Purpose
- Current - Output:
- -
- Voltage - Supply:
- -
- Voltage - Load:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-SSOP
A5936GLNTR-T FAQ
1.How can I place an order for A5936GLNTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A5936GLNTR-T 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 A5936GLNTR-T reliable?
The price and inventory of A5936GLNTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A5936GLNTR-T is usually 5 days.
3.What payment methods are accepted for A5936GLNTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A5936GLNTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A5936GLNTR-T?
A5936GLNTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A5936GLNTR-T 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 A5936GLNTR-T?
For technical support, including A5936GLNTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A5936GLNTR-T requirements.
6.How does Aetrix verify that A5936GLNTR-T is sourced from the original manufacturer or authorized distributors?
All A5936GLNTR-T 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 A5936GLNTR-T meets industry standards.
7.What is the process for return or replacement of A5936GLNTR-T?
All A5936GLNTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A5936GLNTR-T, 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 A5936GLNTR-T part is unused and in its original packaging.
Return procedure for A5936GLNTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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