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Allegro MicroSystems A89303KLPTR-T
- Part No.:
- A89303KLPTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A89303KLPTR-T.pdf
- Description:
- AUTOMOTIVE SENSORLESS BLDC DRIVE
- Quantity:
- Payment:
- Shipping:
Inventory:4,204
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Product details
Overview
A89303KLPTR-T from Allegro MicroSystems is a three-phase sensorless BLDC motor driver IC designed for automotive coolant and HVAC pump applications. It implements trapezoidal commutation, supports PWM duty-cycle or I²C control, integrates low-RDS(ON) power MOSFETs (300 mΩ typ. at 25°C), delivers up to 3.6 A output current, and operates across –40°C to +125°C with AEC-Q100 qualification.
For engineers reviewing the A89303KLPTR-T datasheet, A89303KLPTR-T pinout, A89303KLPTR-T application, or A89303KLPTR-T equivalent, key selection considerations include its 20-lead TSSOP-LP package with exposed thermal pad, integrated charge pump (VCP = VBB + 7 V), FG speed feedback output, lock detection with auto-restart, and EEPROM-programmable startup parameters via I²C slave address 0x55.
Technical Context
The A89303KLPTR-T uses back-EMF zero-crossing detection for rotor position estimation without Hall sensors, enabling compact, cost-effective pump designs. Its trapezoidal drive algorithm minimizes ramp-up time to maximum speed while maintaining stable commutation under variable load conditions.
Control is implemented via either analog PWM input (2.1–45 kHz, 10% DCON threshold) or digital I²C interface (fast-mode, 8–400 kHz), with EEPROM storage for startup timing, BEMF filtering, OCL level, and direction configuration. Fault management includes latched overcurrent protection (OCP), thermal shutdown (175°C TJTSD), VBB undervoltage/overvoltage monitoring, and dual open-drain fault flags (FF1/FF2) with priority-based status encoding.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5.5 V to 40 V - Supports full automotive battery range including cold-crank and load-dump transients. |
| Output Current | 3.6 A continuous - Sufficient for low-power automotive pumps (e.g., <150 W). |
| RDS(ON) (Total) | 300 mΩ typ. at 25°C - Minimizes conduction loss and thermal rise in 20-lead TSSOP-LP package. |
| Motor PWM Frequency | 24.5 kHz typ. - Reduces audible noise and EMI while maintaining efficient switching. |
| I²C Slave Address | 0x55 - Enables multi-device bus configuration without address conflict in pump control modules. |
| Operating Temperature | –40°C to +125°C - Validated for under-hood automotive environments per AEC-Q100 Grade 1. |
| EEPROM Capacity | 16 × 16-bit words - Stores calibrated startup parameters, BEMF filter settings, and fault response configurations. |
Pinout & Package
Package: 20-lead TSSOP with exposed thermal pad (LP suffix), 6.5 mm × 4.4 mm × 1.2 mm, JEDEC MO-153ACT-compliant. Exposed pad must be connected to GND for thermal and electrical integrity.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CP2) | Charge pump capacitor terminal | Connects external 0.22 µF X7R ceramic capacitor to stabilize VCP generation. |
| 2 (CP1) | Charge pump capacitor terminal | Second node of charge pump network; forms flying capacitor pair with CP2. |
| 4 (PWM/SCL) | Multi-function logic input | Accepts PWM duty signal (2.1–45 kHz) or serves as I²C clock (SCL); shared pin requires mode arbitration. |
| 7 (FF2), 8 (FF1) | Open-drain fault flag outputs | Encode fault type (TSD, OCP, voltage) via 2-bit status; require external pull-ups. |
| 9 (FG/SDA) | Multi-function I/O | Outputs motor speed frequency (FG) or acts as I²C data line (SDA); bidirectional with internal pull-down. |
| 10 (GND) | Ground reference | Main signal and power ground; connects directly to exposed thermal pad. |
| 11 (CTAP) | Motor common connection | Reference point for motor winding center-tap; left floating if delta-connected motor used. |
| 12 (OUTA), 15 (OUTB), 19 (OUTC) | High-side/low-side motor phase outputs | Drive three-phase BLDC windings; each capable of 3.6 A sink/source with integrated MOSFETs. |
| 13, 18 (VBB) | Power supply input | Dual VBB pins reduce IR drop and improve current sharing into internal regulators and gate drivers. |
| 14, 16 (LSS) | Low-side source sense | Connects to current-sense resistor (RSENSE) for overcurrent protection and closed-loop current limiting. |
| 20 (VCP) | Charge pump output | Provides ~7 V above VBB to drive high-side MOSFET gates; monitored for UVLO (3.85 V threshold). |
Key Features
| Feature | Design Value |
|---|---|
| Sensorless trapezoidal commutation | Eliminates Hall sensors and associated wiring, reducing BOM cost and improving reliability in sealed pump housings. |
| Configurable startup sequence | EEPROM-programmable ALIGN, LOCK, and STEPS registers enable tuning for diverse pump inertia and fluid dynamics. |
| Dual-control interface | Hardware PWM and software I²C modes allow flexible integration-PWM for simple speed control, I²C for diagnostics and adaptive tuning. |
| Latched overcurrent protection | OCP fault persists until PWM OFF→ON cycle, preventing uncontrolled restart after short-circuit events on motor leads. |
| Thermal and voltage fault prioritization | FF1/FF2 encoding gives rotor lock priority over thermal fault when PWM is high, ensuring safe stall recovery behavior. |
Applications
| Automotive Engine Coolant Pump | Automotive HVAC Blower Motor |
|---|---|
Use Scenario: Variable-speed electric coolant pump regulating engine temperature in 48 V mild-hybrid systems. IC Role / Device Role / Timing Role: Three-phase BLDC driver executing sensorless trapezoidal commutation with real-time back-EMF zero-crossing detection. Use Value: Enables precise flow control, reduces parasitic losses vs. mechanical pumps, and meets AEC-Q100 requirements for under-hood operation. | Use Scenario: Compact HVAC blower module requiring quiet, efficient airflow modulation in cabin climate control. IC Role / Device Role / Timing Role: Integrated gate driver and protection controller managing motor acceleration, speed regulation, and fault response. Use Value: Delivers 24.5 kHz PWM switching to suppress audible noise, supports soft-start to limit inrush, and provides FG feedback for closed-loop speed validation. |
| Electric Power Steering Assist Pump | Brake Booster Vacuum Pump |
Use Scenario: Safety-critical vacuum or hydraulic assist pump where lock detection and auto-restart are mandatory. IC Role / Device Role / Timing Role: Fault-tolerant motor controller with latched OCP, thermal shutdown, and dual FF flags for ASIL-B–compatible diagnostics. Use Value: Guarantees fail-safe behavior during rotor stall: disables outputs, initiates TLOCK timer, and attempts controlled restart after timeout. | Use Scenario: 12 V brake booster vacuum pump in ICE and hybrid vehicles requiring robust transient immunity. IC Role / Device Role / Timing Role: High-voltage tolerant driver (40 V max VBB) with integrated VBB OVP (31.5 V threshold) and TVS-compatible layout guidance. Use Value: Withstands ISO 7637-2 pulse 5a/b transients; VBB OVP prevents MOSFET damage during load dump events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar three-phase sensorless BLDC pump driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP6532GQ-Z | Integrated current sense amplifier; no EEPROM; 5 V logic supply only; 32-pin QFN only. | Lacks programmable startup and BEMF tuning; limited to 5.5–28 V VBB; no AEC-Q100 qualification. | Select MP6532GQ-Z only for non-automotive, cost-sensitive 5 V systems where field calibration is unnecessary. |
| DRV10983ZPWPR | Requires external bootstrap capacitors; no integrated charge pump; I²C address fixed at 0x0D; 24-pin HTSSOP only. | No VCP UVLO monitoring; lacks FG output; lower RDS(ON) (220 mΩ) but rated only to 125°C ambient. | Choose DRV10983ZPWPR when higher efficiency at high ambient is critical and board space allows discrete charge pump implementation. |
Compared with MP6532GQ-Z and DRV10983ZPWPR, the A89303KLPTR-T uniquely combines AEC-Q100 qualification, integrated charge pump with VCP UVLO, EEPROM-based startup customization, and dual-control flexibility-making it optimal for production automotive pump modules requiring functional safety and field adaptability.
Availability
A89303KLPTR-T is available at Aetrix Electronics and suitable for automotive coolant pumps, HVAC blowers, brake booster vacuum pumps, and EPS assist pumps requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for A89303KLPTR-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 power management solutions for automotive and industrial markets.
The A89303 product line targets automotive fluid-handling systems, delivering highly integrated, AEC-Q100–qualified three-phase BLDC drivers with sensorless control, programmable startup, and comprehensive fault protection for pump applications.
FAQ
What is the function of the FG/SDA pin on the A89303KLPTR-T?
The FG/SDA pin on the A89303KLPTR-T serves two distinct roles: as an open-drain FG output that pulses at motor electrical frequency (enabling tachometer feedback), and as the I²C data line (SDA) when the device is in serial communication mode. The pin automatically switches functions based on detected activity-FG mode during PWM operation, SDA mode upon I²C start condition. Internal pull-down ensures safe default state during power-up.
How does the A89303KLPTR-T implement sensorless commutation without Hall sensors?
The A89303KLPTR-T implements sensorless commutation by continuously monitoring back-EMF voltage on unenergized motor phases during trapezoidal drive intervals. It detects zero-crossing points using internal comparators referenced to CTAP, then advances commutation states with configurable timing (via EEPROM STEPS register). This eliminates Hall sensors while maintaining synchronization across speeds from startup to maximum RPM.
Can the A89303KLPTR-T operate with a 5 V supply, or is it strictly a 12 V+ automotive device?
The A89303KLPTR-T supports a minimum VBB of 5.5 V and is fully specified down to that level, making it compatible with regulated 5 V systems-but only when VBB remains ≥5.5 V under all operating conditions. Its design targets automotive 12 V and 48 V architectures, with absolute maximum VBB at 40 V and built-in protection against load dump transients up to 31.5 V.
What is the purpose of the dual LSS pins (pins 14 and 16) on the A89303KLPTR-T?
The dual LSS pins (14 and 16) on the A89303KLPTR-T provide parallel low-side current sensing paths to reduce PCB trace resistance and improve accuracy of overcurrent protection. Both pins connect internally to the same current-sense amplifier input, allowing designers to route RSENSE returns through separate copper pours-minimizing measurement error caused by shared return path IR drop during high-current transients.
Does the A89303KLPTR-T require external bootstrap capacitors, or is the charge pump fully integrated?
The A89303KLPTR-T integrates a complete charge pump circuit (VCP, CP1, CP2) that generates a gate drive voltage ~7 V above VBB, eliminating the need for external bootstrap diodes or capacitors. Two 0.22 µF X7R ceramic capacitors (CP1–CP2 and CP2–VCP) are required per the datasheet, but no high-voltage bootstrap components are needed-simplifying layout and improving reliability in space-constrained pump modules.
A89303KLPTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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:
- I2C, PWM
- Technology:
- Power MOSFET
- Step Resolution:
- -
- Applications:
- -
- Current - Output:
- 3.6A
- Voltage - Supply:
- 5.5V ~ 40V
- Voltage - Load:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
A89303KLPTR-T FAQ
1.How can I place an order for A89303KLPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A89303KLPTR-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 A89303KLPTR-T reliable?
The price and inventory of A89303KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A89303KLPTR-T is usually 5 days.
3.What payment methods are accepted for A89303KLPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A89303KLPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A89303KLPTR-T?
A89303KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A89303KLPTR-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 A89303KLPTR-T?
For technical support, including A89303KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A89303KLPTR-T requirements.
6.How does Aetrix verify that A89303KLPTR-T is sourced from the original manufacturer or authorized distributors?
All A89303KLPTR-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 A89303KLPTR-T meets industry standards.
7.What is the process for return or replacement of A89303KLPTR-T?
All A89303KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A89303KLPTR-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 A89303KLPTR-T part is unused and in its original packaging.
Return procedure for A89303KLPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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