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Allegro MicroSystems A5936GLKTR-T
- Part No.:
- A5936GLKTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 10-LSOP (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
A5936GLKTR-T.pdf
- Description:
- IC MOTOR DRIVER 10SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,986
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Product details
Overview
A5936GLKTR-T from Allegro MicroSystems is a discontinued three-phase sensorless sinusoidal fan driver IC designed for low-noise, low-vibration cooling in DC brushless fans. It delivers 1.5–3 A overcurrent limit, 24.4 kHz typical motor PWM frequency, and operates across –40°C to 105°C with 10-lead eSOIC package featuring exposed thermal pad.
For engineers reviewing the A5936GLKTR-T datasheet, A5936GLKTR-T pinout, A5936GLKTR-T application, or A5936GLKTR-T equivalent, key selection considerations include its sinusoidal drive architecture, FG speed feedback output, lock detection with 5 s auto-restart, standby mode (<1 µA quiescent), and compatibility with legacy 4–16 V systems using PWM or voltage-mode speed control.
Technical Context
The A5936GLKTR-T implements a proprietary sensorless BEMF-based position detection window on phase A to synchronize 120°-phase-shifted sinusoidal modulation. Its 9-bit PWM duty-to-demand conversion enables precise speed resolution while maintaining low acoustic noise via soft-start ramping and adaptive current waveform shaping.
Protection logic integrates undervoltage lockout (4.7–4.9 V rising threshold), thermal shutdown at 150–180°C with 35°C hysteresis, short-circuit detection, and overcurrent limiting via low-side MOSFET sensing - all operating without external components beyond CVREF (0.1 µF) and CVBB (4.7–47 µF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBB Range | 4 V to 16 V - supports legacy 5 V and modern 12 V fan systems; enables voltage-mode speed control |
| Motor PWM Frequency | 24.4 kHz typical - ultrasonic operation eliminates audible switching noise |
| Overcurrent Limit | 2 A typical - protects motor and IC during stall or overload without external sense resistor |
| Standby Current | <1 µA - achieved by holding PWM low >5 s; powers down VREF to minimize system leakage |
| FG Output | Open-drain, one pulse per electrical revolution - provides direct RPM feedback to host controller |
| RDS(on) Total | 1 Ω typical at 8 V - low conduction loss enables high efficiency at full load |
| Startup Acceleration | Configurable via ACC pin (0–1000 Hz/s) - allows tuning for different fan inertia and acoustic profiles |
Pinout & Package
Package: 10-lead eSOIC with exposed thermal pad (suffix LK); RoHS-compliant, 100% matte-tin leadframe; requires thermal vias under pad for optimal dissipation (RθJA = 35°C/W on 2-layer PCB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM | Logic input | Duty-cycle command input; enables motor if duty >10%; filtered to reject noise |
| FG | Open-drain output | Speed feedback signal - one pulse per electrical revolution; requires external pull-up |
| VBB | Power supply | Main motor driver supply (4–16 V); powers internal regulators and gate drivers |
| OUTA/OUTB/OUTC | Motor terminals | Three-phase half-bridge outputs; deliver sinusoidal current to BLDC fan windings |
| GND | Ground reference | Common return for power, logic, and analog sections; must be low-impedance |
| VREF | Analog reference | 2.9 V ±50 mV output; supplies ACC/DMD divider and internal ADC |
| DMD | Logic input | Selects startup VINIT level (HI/LO); used with ACC to configure acceleration profile |
| ACC | Analog input | Voltage divider input (0–2.9 V) selecting one of 16 startup parameter sets via lookup table |
| PAD | Thermal pad | Internally connected to GND; mandatory for thermal performance and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Quiet startup sequence | 6-stage ramp with open-loop sine drive at 812 mHz, then 1.6 s frequency ramp, followed by synchronized soft-start - eliminates mechanical "thunk" |
| Sensorless BEMF timing | Narrow position-sensing window on phase A only - minimizes torque ripple and preserves ideal sinusoidal current shape |
| Configurable acceleration | 16 startup profiles selectable via ACC voltage (0–2.9 V) and DMD logic state - adapts to fan inertia and acoustic targets |
| Integrated protection suite | Lock detection (5 s timeout), OCP (2 A), UVLO (4.7 V rising), TSD (150°C), and short-circuit shutdown - no external fault management required |
| Low-component footprint | Only two external capacitors (CVREF, CVBB) needed - eliminates gate resistors, bootstrap diodes, and current sense networks |
Applications
| Server Fan Control | Industrial Enclosure Cooling |
|---|---|
Use Scenario: High-density 1U/2U server chassis requiring silent, reliable airflow with dynamic thermal response. IC Role / Device Role / Timing Role: Three-phase sinusoidal motor driver with FG feedback for closed-loop RPM control and lock detection. Use Value: Eliminates audible coil whine and vibration-induced resonance in aluminum chassis, improving acoustic compliance and component longevity. | Use Scenario: Fan-cooled programmable logic controllers (PLCs) and HMIs operating continuously in factory environments. IC Role / Device Role / Timing Role: Sensorless BLDC driver enabling maintenance-free cooling with thermal shutdown and undervoltage protection. Use Value: Extends fan life by avoiding mechanical wear from hard starts and preventing thermal runaway during ambient temperature spikes. |
| Medical Diagnostic Equipment | Network Switch/Router Cooling |
Use Scenario: MRI support systems and imaging workstations where electromagnetic compatibility and acoustic silence are critical. IC Role / Device Role / Timing Role: Low-EMI sinusoidal driver with 24.4 kHz carrier and minimal external components to reduce radiated emissions. Use Value: Meets Class B FCC limits without shielding; avoids interference with sensitive analog front-ends and RF receivers. | Use Scenario: Multi-fan cooling in enterprise-grade Ethernet switches with centralized thermal management firmware. IC Role / Device Role / Timing Role: PWM-controlled fan driver providing FG feedback for real-time RPM monitoring and predictive failure analysis. Use Value: Enables firmware-based fan curve tuning and early lock-detection alerts, reducing unplanned downtime in data center infrastructure. |
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) (1.5 Ω typ), no ACC/DMD startup configuration, fixed 20 kHz PWM | Lacks configurable acceleration and quiet startup; suited for cost-sensitive, non-acoustic-critical designs | Choose when design prioritizes BOM simplicity over acoustic optimization and startup smoothness |
| DRV10983ZRTVT | Integrated commutation logic, 12-bit speed resolution, but requires external current sense and bootstrap capacitor | More complex layout and higher external component count; supports wider motor voltage range (3–24 V) | Choose when flexibility across diverse BLDC motors outweighs integration and acoustic goals of A5936GLKTR-T |
Compared with MP6532GQ-Z and DRV10983ZRTVT, the A5936GLKTR-T uniquely combines ultra-low-noise sinusoidal drive, fully integrated protection, and analog-configurable startup - making it optimal for acoustic-sensitive, high-reliability fan systems despite its discontinued status.
Availability
A5936GLKTR-T is available at Aetrix Electronics and suitable for server fan control, industrial enclosure cooling, medical diagnostic equipment, and network switch/router cooling requiring stable component supply despite end-of-life status.
Supply support for A5936GLKTR-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 Hall-effect sensors, motor drivers, and power ICs focused on motion control and energy-efficient systems.
The A5936 product line was engineered specifically for ultra-quiet, high-efficiency three-phase BLDC fan applications in computing, medical, and industrial environments - emphasizing sinusoidal drive fidelity and integrated protection.
FAQ
Is A5936GLKTR-T still in production?
No, the A5936GLKTR-T is officially discontinued as of September 13, 2024. Allegro MicroSystems has ceased manufacturing and no new samples are available. Aetrix Electronics maintains limited legacy stock for existing production continuity, subject to quantity and allocation policies.
What is the function of the ACC pin on A5936GLKTR-T?
The ACC pin on A5936GLKTR-T is an analog input that selects one of 16 startup acceleration profiles via a resistor divider referenced to VREF (2.9 V). Voltage applied to ACC - combined with the DMD logic state - determines open-loop ramp rate, initial voltage, and maximum electrical frequency during quiet startup.
Can A5936GLKTR-T operate below 5 V?
Yes, the A5936GLKTR-T supports operation down to 4 V on VBB, enabling compatibility with legacy 5 V systems and low-voltage fan designs. Its undervoltage lockout activates at 3.85–3.95 V (falling) and releases at 4.7–4.9 V (rising), ensuring stable startup and graceful shutdown.
How does the FG output of A5936GLKTR-T relate to motor speed?
The FG output of A5936GLKTR-T is an open-drain signal that toggles once per electrical revolution of the motor - not per mechanical rotation. For a 4-pole BLDC fan, this yields two FG pulses per mechanical revolution, enabling accurate RPM calculation when paired with known pole count and appropriate firmware scaling.
What thermal design practices are required for A5936GLKTR-T in eSOIC package?
A5936GLKTR-T in the 10-lead eSOIC package requires thermal vias under the exposed pad connected to a solid ground plane on both PCB layers. With this layout, its junction-to-ambient thermal resistance is 35°C/W - critical for sustaining 2 A continuous output without exceeding 150°C junction temperature in 105°C ambient.
A5936GLKTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 10-LSOP (0.154", 3.90mm Width) Exposed Pad
- 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-SOIC
A5936GLKTR-T FAQ
1.How can I place an order for A5936GLKTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A5936GLKTR-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 A5936GLKTR-T reliable?
The price and inventory of A5936GLKTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A5936GLKTR-T is usually 5 days.
3.What payment methods are accepted for A5936GLKTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A5936GLKTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A5936GLKTR-T?
A5936GLKTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A5936GLKTR-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 A5936GLKTR-T?
For technical support, including A5936GLKTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A5936GLKTR-T requirements.
6.How does Aetrix verify that A5936GLKTR-T is sourced from the original manufacturer or authorized distributors?
All A5936GLKTR-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 A5936GLKTR-T meets industry standards.
7.What is the process for return or replacement of A5936GLKTR-T?
All A5936GLKTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A5936GLKTR-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 A5936GLKTR-T part is unused and in its original packaging.
Return procedure for A5936GLKTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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