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Allegro MicroSystems A4960SJPTR-T
- Part No.:
- A4960SJPTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 32-LQFP Exposed Pad
- Datasheet:
-
A4960SJPTR-T.pdf
- Description:
- IC FAN DRIVER BLDC QFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,057
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Product details
Overview
A4960SJPTR-T from Allegro MicroSystems is a three-phase, sensorless brushless DC (BLDC) motor controller IC designed for automotive applications, driving external N-channel MOSFETs via six gate drivers (3 high-side, 3 low-side), operating from 7–50 V supply, featuring integrated bootstrap charge management, programmable start-up sequencing, and serial diagnostics output. It enables hydraulic pump, fuel pump, and urea pump control without position sensors.
For engineers reviewing the A4960SJPTR-T datasheet, A4960SJPTR-T pinout, A4960SJPTR-T application, or A4960SJPTR-T equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade protection features (VDS fault detection, overtemperature warning at 125°C, undervoltage lockout), and real-world motor control timing parameters including 35.6 µs typical fixed off-time and 1.0 µs default dead time.
Technical Context
The A4960SJPTR-T implements trapezoidal (block) commutation using proprietary back-EMF zero-crossing detection on undriven motor phases, with adaptive blanking (tCB = 42.5–57.5 µs), programmable hysteresis (VBHYSL = 60 mV, VBHYSH = 240 mV), and BEMF window timing (tBW = 5.4–7.4 µs). Rotor position is inferred without Hall sensors or encoders.
It integrates a charge pump enabling high-side gate drive down to 7 V VBB, regulated VREG output (12.4–13.8 V), and configurable diagnostics including serial fault word reporting. Protection includes shoot-through prevention via adjustable dead time, VDS monitoring per phase, and thermal shutdown at 170°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBB Operating Range | 7–50 V - supports full automotive battery range including cold-crank (6 V min functional) and load-dump transients. |
| VREG Output | 12.4–13.8 V @ 0–8 mA - powers low-side drivers and bootstraps; stable across VBB ≥ 9 V. |
| Fixed Off-Time | 35.6 µs typical - sets minimum PWM on-time for current regulation in trapezoidal drive. |
| Dead Time | 1.0 µs default - prevents shoot-through during high/low-side switching transitions. |
| BEMF Hysteresis | 60 mV (low) / 240 mV (high) - improves zero-crossing noise immunity during start-up and steady-state operation. |
| TJ Max / Warning | 170°C fault threshold / 125–145°C warning range - enables thermal derating and fail-safe response in under-hood environments. |
| Diagnostic Output | Serial 16-bit fault word via SDO - provides granular fault identification (VREG UV, VDD UV, short-to-battery, short-to-ground, overtemperature). |
Pinout & Package
Package: 32-pin LQFP with exposed thermal pad (JP suffix); Pb-free, 100% matte-tin leadframe plating (–T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBB (32) | Main power supply input | Connects to battery rail; powers internal regulators and charge pump; requires reverse-voltage protection and local ceramic decoupling. |
| VDD (4) | Logic supply input | Accepts 3.3 V or 5 V; powers digital core and SPI interface; must be decoupled with 100 nF capacitor. |
| GHA/GHB/GHC (24,20,18) | High-side gate drive outputs | Drive external N-channel MOSFET gates; each referenced to its respective phase voltage (CA/CB/CC). |
| GLA/GLB/GLC (23,19,15) | Low-side gate drive outputs | Drive external N-channel MOSFET sources; referenced to VREG; capable of 150 mA sink current. |
| SA/SB/SC (25,21,16) | Motor phase connections | Connect to motor windings; serve as bootstrap capacitor return nodes and BEMF sensing points. |
| CSP/CSM (13,12) | Current sense amplifier inputs | Differential inputs for external shunt resistor; support ±200 mV input range and 5% trip accuracy. |
| DIAG (5) | Programmable diagnostic output | Configurable as fault flag, sensorless operation indicator, timer output, or VDS threshold monitor. |
| TACHO (7) | Motor speed pulse output | Open-drain output; pulses per electrical revolution; remains low until first valid BEMF zero-crossing. |
| SCK/SDI/SDO/STRN (9,10,8,11) | SPI serial interface | 16-bit MSB-first interface; STRN enables slave select; SDO tri-states when STRN high; supports configuration and diagnostics readback. |
| RESETN (2) | Standby mode control | Active-low; pulsed to clear faults; held low >10 µs enters sleep mode (<10 µA quiescent current). |
Key Features
| Feature | Design Value |
|---|---|
| Sensorless BEMF commutation | Eliminates Hall sensors or encoders; uses adaptive zero-crossing detection with programmable blank time and hysteresis for robust start-up and run stability. |
| Integrated bootstrap charge management | Automatic charge pump and monitoring ensure high-side gate drive remains functional even at 7 V VBB, avoiding external charge-pump ICs. |
| Cross-conduction protection | Hardware-enforced dead time (adjustable 0.85–1.15 µs) plus gate-drive timing controls prevent shoot-through in 3-phase bridge. |
| Comprehensive fault coverage | Detects VREG/VDD undervoltage, overtemperature (125°C warning / 170°C shutdown), VDS shorts (to battery/ground/winding), and reports via serial diagnostic word. |
| Automotive-grade thermal design | 32-pin LQFP with exposed pad achieves 2°C/W junction-to-pad thermal resistance; rated for –40°C to +150°C ambient operation. |
Applications
| Hydraulic Pump Control | Fuel Pump Drive |
|---|---|
Use Scenario: Closed-loop pressure regulation in electro-hydraulic brake (EHB) or active suspension systems. IC Role / Device Role / Timing Role: Sensorless BLDC controller managing commutation timing, current limiting, and fault response without rotor position feedback. Use Value: Enables compact, reliable pump actuation with integrated diagnostics for ASIL-B–compatible system monitoring. |
Use Scenario: High-efficiency, variable-speed fuel delivery in gasoline direct injection (GDI) engines. IC Role / Device Role / Timing Role: Motor controller executing trapezoidal drive with programmable start-up torque and ramp rate to match engine demand. Use Value: Reduces EMI and acoustic noise vs. brushed motors while supporting wide VBB range (7–50 V) for stop-start operation. |
| Urea Dosing Pump | Blower Fan System |
Use Scenario: Precise metering of aqueous urea solution (AdBlue®) into diesel exhaust for SCR NOx reduction. IC Role / Device Role / Timing Role: Controller providing accurate speed control via TACHO feedback and current-limited acceleration to avoid crystallization at low flow rates. Use Value: Ensures dosing accuracy across temperature extremes (–40°C to +125°C ambient) with built-in overtemperature warning. |
Use Scenario: HVAC cabin air blower requiring quiet, efficient airflow modulation in passenger vehicles. IC Role / Device Role / Timing Role: Sensorless motor driver delivering smooth low-speed torque and fast transient response using BEMF-based commutation. Use Value: Eliminates Hall sensor cost and failure modes while maintaining <1% speed regulation error under load variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar three-phase sensorless BLDC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP6532GQ-Z | Integrated MOSFETs (40 V, 2.5 A); no external FET requirement; lower voltage range (4.5–35 V); no serial diagnostics. | Targeted at lower-power fans and small pumps; lacks automotive-grade fault reporting and VBB > 35 V capability. | Choose MP6532GQ-Z only if board space and BOM count are prioritized over diagnostic depth and 50 V transient tolerance. |
| STSPIN32F0A | Embedded 32-bit ARM Cortex-M0; integrated gate drivers and op-amp; supports FOC and trapezoidal; 7–45 V VDD range. | Enables field-oriented control and advanced motor algorithms; higher software integration overhead than A4960SJPTR-T's dedicated hardware sequencer. | Choose STSPIN32F0A when algorithmic flexibility (e.g., torque ripple reduction) outweighs deterministic hardware timing and ASIL-ready diagnostics. |
Compared with MP6532GQ-Z and STSPIN32F0A, the A4960SJPTR-T delivers superior automotive fault visibility via serial diagnostic word, wider 7–50 V operation for load-dump resilience, and dedicated hardware-based sensorless commutation-making it optimal for safety-critical, high-reliability pump applications where deterministic timing and comprehensive fault classification are required.
Availability
A4960SJPTR-T is available at Aetrix Electronics and suitable for hydraulic pump, fuel pump, and urea pump designs requiring stable component supply, long-term automotive lifecycle support, and traceable sourcing through qualified distribution channels.
Supply support for A4960SJPTR-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 semiconductor company specializing in high-performance magnetic sensing and power ICs for automotive and industrial motion control.
The A4960 product line is engineered specifically for automotive BLDC motor control, emphasizing sensorless operation, robust fault protection, and thermal reliability in under-hood environments.
FAQ
What is the minimum VBB voltage required for A4960SJPTR-T to operate with full functionality?
The A4960SJPTR-T maintains full functionality-including gate drive, diagnostics, and serial interface-at VBB ≥ 7 V. Below 7 V, VREG output drops below specification (e.g., 9–10 V at 5.5–6 V VBB), compromising high-side drive margin and potentially causing commutation instability. Operation down to 5.5 V is possible with outputs disabled, but not recommended for active motor control.
How does the A4960SJPTR-T handle motor start-up without position sensors?
The A4960SJPTR-T uses an open-loop stepper-like start sequence with programmable hold torque, ramp rate, and acceleration parameters (configured via SPI registers Config3–Config5). Once a valid BEMF zero-crossing is detected on any phase, it transitions seamlessly to closed-loop sensorless commutation-ensuring reliable start-up across diverse motor inertia and load friction profiles.
Can the A4960SJPTR-T drive both high-side and low-side N-channel MOSFETs simultaneously?
No-the A4960SJPTR-T enforces strict shoot-through prevention via hardware-controlled dead time (default 1.0 µs) between high-side turn-off and low-side turn-on, and vice versa. Its gate drivers are designed for complementary half-bridge operation: only one device per leg (high- or low-side) is actively driven at any given time, with precise timing coordination managed internally.
What diagnostic information is available on the DIAG pin of the A4960SJPTR-T?
The DIAG pin of the A4960SJPTR-T is configurable via register DGx bits to output four distinct signals: default fault flag (active-low), sensorless operation indicator (pulsed during valid BEMF detection), internal timer output, or VDS threshold monitor. Full diagnostic status-including VREG UV, VDD UV, overtemperature, and phase-specific short faults-is available as a 16-bit serial word via SDO.
Is the A4960SJPTR-T compliant with automotive AEC-Q100 qualification?
Yes-the A4960SJPTR-T is AEC-Q100 qualified (Grade 1: –40°C to +125°C ambient, with junction rating up to +150°C). Its design incorporates automotive-specific features including enhanced ESD protection (±2 kV HBM), extended voltage range (7–50 V), and fault reporting aligned with ISO 26262 functional safety requirements for ASIL-B systems.
A4960SJPTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 32-LQFP Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Controller - Commutation, Direction Management
- Output Configuration:
- Pre-Driver - Half Bridge (3)
- Interface:
- SPI
- Technology:
- Power MOSFET
- Step Resolution:
- -
- Applications:
- General Purpose
- Current - Output:
- -
- Voltage - Supply:
- 3V ~ 5.5V
- Voltage - Load:
- 7V ~ 50V
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-LQFP (7x7)
A4960SJPTR-T FAQ
1.How can I place an order for A4960SJPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A4960SJPTR-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 A4960SJPTR-T reliable?
The price and inventory of A4960SJPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A4960SJPTR-T is usually 5 days.
3.What payment methods are accepted for A4960SJPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A4960SJPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A4960SJPTR-T?
A4960SJPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A4960SJPTR-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 A4960SJPTR-T?
For technical support, including A4960SJPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A4960SJPTR-T requirements.
6.How does Aetrix verify that A4960SJPTR-T is sourced from the original manufacturer or authorized distributors?
All A4960SJPTR-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 A4960SJPTR-T meets industry standards.
7.What is the process for return or replacement of A4960SJPTR-T?
All A4960SJPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A4960SJPTR-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 A4960SJPTR-T part is unused and in its original packaging.
Return procedure for A4960SJPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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