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Allegro MicroSystems A5932GESSR-1-T
- Part No.:
- A5932GESSR-1-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
A5932GESSR-1-T.pdf
- Description:
- 5932-1 (SENSORLESS SINE BLDC GAT
- Quantity:
- Payment:
- Shipping:
Inventory:17,977
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Product details
Overview
A5932GESSR-1-T from Allegro MicroSystems is a three-phase sinusoidal sensorless fan controller IC designed for high-power server and telecom cooling fans. It delivers quiet startup via sinusoidal voltage profiling, supports 5.5–50 V supply, provides configurable closed-loop speed curves, and integrates automatic phase advance, windmill detection, and overcurrent/short-circuit protection.
For engineers reviewing the A5932GESSR-1-T datasheet, A5932GESSR-1-T pinout, A5932GESSR-1-T application, or A5932GESSR-1-T equivalent, this page details its automotive-grade (AEC-Q100 G-grade), 24-pin QFN (4 mm × 4 mm) implementation with integrated gate drive, FG/RD speed outputs, and EEPROM-programmable motor control parameters.
Technical Context
The A5932GESSR-1-T implements a proprietary sensorless commutation algorithm that synthesizes sinusoidal current waveforms using 120° phase-shifted PWM modulation at 24.4 kHz typical frequency. It measures SPD input duty cycle (6–100 kHz range) or analog voltage (0.5–2.485 V), converts it to a 9-bit demand value, and maps it to RPM via programmable slope/offset in EEPROM.
Core functional blocks include BEMF-based rotor position estimation, lock detection with auto-restart, adjustable gate drive current (via ISET resistor), thermal shutdown (170°C trip), and dual-mode protection: cycle-by-cycle OCP (1 V or 2 V VDS threshold) and latched overcurrent limit (255 mV sense threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5.5 V to 50 V - supports wide-input 12 V/24 V/48 V fan systems without external regulators |
| Motor Drive Type | Sinusoidal sensorless three-phase - eliminates torque ripple and audible noise vs. trapezoidal drives |
| Speed Input Interface | PWM duty cycle (6–100 kHz) or analog voltage (0.5–2.485 V) - selectable via EEPROM bit SPDSEL |
| Output Frequency | 24.4 kHz typical PWM - fixed-frequency operation ensures EMI predictability and filter design stability |
| Thermal Rating | AEC-Q100 Grade G (–40°C to +105°C) - qualified for industrial and automotive under-hood cooling applications |
| Protection Features | OCP (1/2 V VDS threshold), OCL (255 mV), thermal shutdown (170°C), VBB UVLO (4.85 V), lock detect - enables robust field operation without external supervision |
| Package | 24-contact QFN, 4 mm × 4 mm × 0.75 mm with exposed thermal pad - optimized for high-power density and thermal dissipation (RθJA = 45°C/W) |
Pinout & Package
Package: 24-pin QFN (ES suffix), 4 mm × 4 mm × 0.75 mm body with exposed thermal pad (PAD). Pb-free, 100% matte-tin leadframe plating. Thermal pad must be soldered to PCB ground plane for optimal junction temperature management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CP2) | Charge pump capacitor connection | Second stage of charge pump network; requires 0.1 µF X5R 10 V ceramic capacitor to VBB |
| 2 (CP1) | Charge pump capacitor connection | Primary charge pump node; connects to 0.1 µF X5R 10 V capacitor referenced to VBB |
| 3 (BRAKE) | Active-high brake control input | Forces all low-side MOSFETs on; overrides speed command and prevents standby mode entry |
| 4 (VREF) | 2.86 V reference output | Stable internal reference (±3%); powers internal logic and can source up to 20 mA for external circuitry |
| 5 (SPD) | Speed demand input | Accepts PWM duty cycle or analog voltage; 9-bit ADC resolution (4.89 mV/LSB) enables precise speed mapping |
| 6 (DIR) | Direction control input | Logic high = A→B→C phase sequence; logic low = A→C→B; includes tCOAST delay before reversal |
| 7 (RD) | Rotor fault open-drain output | Asserts logic high on rotor lock or defined fault condition; configurable via EEPROM RDLOW/RDHIGH thresholds |
| 8 (FG) | Speed feedback open-drain output | Two pulses per mechanical revolution; supports RPM calculation (RPM = 30 × fFGOUT) and system monitoring |
| 9 (nFAULT) | Global fault open-drain output | Active-low signal indicating VBB UVLO, thermal shutdown, charge pump UVLO, VBB OV, OCP, or lock detection |
| 10 (ISET) | Gate drive current programming | Resistor to GND sets sink/source current ratio (2:1); default ~30 kΩ yields ~32 mA source / ~62 mA sink |
| 11 (GND) | Power and signal ground | Main return path; must be connected to thermal pad and low-impedance PCB ground plane |
| 12 (GLA) | Low-side gate driver output | Drives low-side MOSFET of phase A; complements GHA; supports adjustable dead time (480 ns typical) |
| 13 (GLB) | Low-side gate driver output | Drives low-side MOSFET of phase B; complements GHB; synchronized with GLA/GLC for 120° phase shift |
| 14 (GLC) | Low-side gate driver output | Drives low-side MOSFET of phase C; complements GHC; enables full three-phase sinusoidal commutation |
| 15 (LSS) | Low-side current sense input | Connects to external sense resistor (RSENSE); sets overcurrent limit: ILIM = 255 mV / RSENSE |
| 16 (SA) | Phase A motor output | High-voltage output node (–2 V to VBB+2 V); connects to motor winding A in Wye or Delta configuration |
| 17 (GHA) | High-side gate driver output | Drives high-side MOSFET of phase A; complements GLA; uses VCP as bootstrap supply |
| 18 (SB) | Phase B motor output | High-voltage output node; connects to motor winding B; supports up to 50 V absolute max rating |
| 19 (GHB) | High-side gate driver output | Drives high-side MOSFET of phase B; bootstrap-supplied via VCP; synchronized with GHA/GHC |
| 20 (SC) | Phase C motor output | High-voltage output node; connects to motor winding C; rated for ±500 mV differential input on LSS |
| 21 (GHC) | High-side gate driver output | Drives high-side MOSFET of phase C; completes three-phase high-side drive set |
| 22 (CTAP) | Motor common tap (Wye only) | Optional connection point for Wye-connected motors; must be left open for Delta configurations |
| 23 (VCP) | Charge pump output | Provides boosted gate drive voltage (6.8 V typical at VBB=8 V); powers high-side drivers GHA/GHB/GHC |
| 24 (VBB) | Main power supply input | 5.5–50 V input; supplies internal regulators, gate drivers, and logic; absolute max 50 V |
| PAD | Exposed thermal pad | Internally connected to GND; must be soldered to large copper area for thermal performance (RθJA = 45°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Sinusoidal drive waveform | Reduces acoustic noise and vibration by eliminating torque ripple-critical for datacenter fan compliance |
| Configurable closed-loop speed curves | EEPROM-programmable MINSPD, SPDSLP, DCON/DCOFF enable precise RPM vs. duty response across operating range |
| Automatic phase advance | Compensates for motor inductance at high speeds; maintains efficiency and torque up to 32 kRPM (PP=2) |
| Windmill detection | Enables safe restart when fan is rotating due to airflow; prevents reverse torque and MOSFET stress |
| Adjustable gate drive strength | ISET resistor (15–60 kΩ) tunes sink/source current from 24–80 mA, optimizing switching loss vs. EMI trade-off |
| Integrated fault reporting | Dedicated nFAULT (global), RD (rotor-specific), and FG (speed) outputs simplify system-level diagnostics and logging |
Applications
| Server Rack Cooling | Telecom Base Station Fans |
|---|---|
|
Use Scenario: High-speed 48 V brushless DC fans in 1U/2U server chassis requiring <35 dBA acoustic noise at full load. IC Role / Device Role / Timing Role: Primary motor controller executing sensorless sinusoidal commutation, speed regulation, and thermal/fault management. Use Value: Enables >90% peak efficiency and <1% speed regulation error across 2000–25,000 RPM range while meeting AEC-Q100 reliability requirements. |
Use Scenario: Forced-air cooling for 5G macro base station power amplifiers operating in outdoor enclosures (–40°C to +70°C ambient). IC Role / Device Role / Timing Role: Fan speed controller interfacing with baseband processor via PWM input; monitors FG for closed-loop thermal management. Use Value: Windmill detection and automatic phase advance maintain stable airflow during transient wind conditions and high-temperature derating. |
| Industrial Power Supply Fans | Automotive ADAS Cooling |
|
Use Scenario: 24 V redundant cooling fans in medical-grade AC/DC power supplies where EMI and reliability are critical. IC Role / Device Role / Timing Role: Three-phase gate driver with integrated OCP, OCL, and thermal shutdown-replacing discrete FET drivers and protection ICs. Use Value: Reduces BOM count by 7 components; eliminates need for external current sense amplifier and fault logic. |
Use Scenario: Cabin-facing LiDAR and radar module cooling in autonomous vehicles requiring AEC-Q100 Grade G qualification. IC Role / Device Role / Timing Role: Motor controller managing fan speed based on junction temperature feedback from ADAS SoC via SPD PWM input. Use Value: Lock detection with auto-restart and VBB UVLO ensure continuous cooling during cold-crank (5.5 V min) and load-dump (50 V max) events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar three-phase sinusoidal fan controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP6550GQ-Z | Single-chip 3-phase gate driver (no integrated controller logic); requires external MCU for commutation and speed loop | Lacks built-in sinusoidal waveform generation, EEPROM configuration, and FG/RD outputs-requires full firmware development | Select when custom motor algorithms or multi-fan synchronization are required; not drop-in for A5932GESSR-1-T's self-contained operation |
| DRV10983ZRTVT | Integrated sensorless BLDC controller with trapezoidal (not sinusoidal) drive; lower max voltage (28 V) and no AEC-Q100 qualification | Higher acoustic noise at high speed; unsuitable for 48 V telecom or automotive under-hood use cases | Consider only for cost-sensitive 12 V/24 V consumer electronics fans where noise is non-critical and temperature range is limited |
Compared with MP6550GQ-Z and DRV10983ZRTVT, the A5932GESSR-1-T uniquely combines AEC-Q100 qualification, 50 V operation, hardware-based sinusoidal drive, and EEPROM-configurable speed curves-enabling faster time-to-market for high-reliability, low-noise cooling systems without MCU dependency.
Availability
A5932GESSR-1-T is available at Aetrix Electronics and suitable for server rack cooling, telecom base station fans, and industrial power supply cooling requiring stable component supply, automotive-grade reliability, and high-efficiency sinusoidal motor control.
Supply support for A5932GESSR-1-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 global leader in precision sensing and power ICs, specializing in magnetic sensors, motor drivers, and high-voltage interface solutions for automotive, industrial, and computing markets.
The A5932 product line is engineered specifically for high-power, low-noise brushless DC fan control in datacenter, telecom, and automotive thermal management systems-emphasizing sensorless sinusoidal commutation, robust fault handling, and AEC-Q100 compliance.
FAQ
What is the operating temperature range for the A5932GESSR-1-T?
The A5932GESSR-1-T is qualified to AEC-Q100 Grade G specifications, supporting continuous operation from –40°C to +105°C ambient. Its thermal shutdown activates at 170°C junction temperature, with 20°C hysteresis for reliable recovery. This range makes the A5932GESSR-1-T suitable for enclosed server chassis and industrial power supplies where ambient temperatures exceed 70°C.
Does the A5932GESSR-1-T require an external microcontroller to operate?
No, the A5932GESSR-1-T operates autonomously as a standalone fan controller. It implements full sensorless sinusoidal commutation, closed-loop speed regulation, and fault management in hardware. While it supports optional I²C configuration via EEPROM, the A5932GESSR-1-T functions immediately upon power-up using factory-default settings-no external MCU or firmware is needed for basic operation.
How does the A5932GESSR-1-T achieve quiet startup?
The A5932GESSR-1-T applies a controlled sinusoidal voltage profile to motor windings during startup, ramping speed gradually rather than applying abrupt trapezoidal torque. This eliminates mechanical jerk and audible "thunk" noise. Combined with automatic phase advance and windmill detection, the A5932GESSR-1-T ensures silent, reliable starts even under airflow-induced rotor rotation.
Can the A5932GESSR-1-T drive both Wye and Delta motor configurations?
Yes-the A5932GESSR-1-T supports both Wye and Delta-connected three-phase BLDC fans. For Wye motors, the CTAP pin connects to the motor neutral point; for Delta motors, CTAP must remain open. The controller adapts BEMF sensing and commutation timing automatically, and motor pole-pair count (1–4) is configurable via EEPROM register PP to ensure accurate speed calculation in either topology.
What protection features are integrated into the A5932GESSR-1-T?
The A5932GESSR-1-T integrates six hardware-based protections: overcurrent limit (OCL) via LSS sense resistor, short-circuit protection (OCP) with 1 V/2 V VDS threshold, VBB undervoltage lockout (4.85 V), VBB overvoltage detection (50 V abs max), thermal shutdown (170°C), and rotor lock detection with auto-restart. All faults assert the nFAULT pin and disable outputs within microseconds-no external circuitry required.
A5932GESSR-1-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Motor Type - Stepper:
- Multiphase
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Fan Control
- Output Configuration:
- Half Bridge (3)
- Interface:
- Analog, I2C, PWM
- Technology:
- NMOS
- Step Resolution:
- -
- Applications:
- Fan Controller
- Current - Output:
- 61.6mA
- Voltage - Supply:
- 5.5V ~ 50V
- Voltage - Load:
- 5.5V ~ 50V
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
A5932GESSR-1-T FAQ
1.How can I place an order for A5932GESSR-1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A5932GESSR-1-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 A5932GESSR-1-T reliable?
The price and inventory of A5932GESSR-1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A5932GESSR-1-T is usually 5 days.
3.What payment methods are accepted for A5932GESSR-1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A5932GESSR-1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A5932GESSR-1-T?
A5932GESSR-1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A5932GESSR-1-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 A5932GESSR-1-T?
For technical support, including A5932GESSR-1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A5932GESSR-1-T requirements.
6.How does Aetrix verify that A5932GESSR-1-T is sourced from the original manufacturer or authorized distributors?
All A5932GESSR-1-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 A5932GESSR-1-T meets industry standards.
7.What is the process for return or replacement of A5932GESSR-1-T?
All A5932GESSR-1-T units undergo pre-shipment inspection (PSI). If there is an issue with A5932GESSR-1-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 A5932GESSR-1-T part is unused and in its original packaging.
Return procedure for A5932GESSR-1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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