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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

Allegro MicroSystems A89304KETJSR

Name: A89304KETJSR
Brand: Allegro MicroSystems
SKU: A89304KETJSR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A89304KETJSR

Manufacturer:: Allegro MicroSystems

Category:: Motor Drivers, Controllers

Package:: 28-VFQFN Exposed Pad

Datasheet:: A89304KETJSR.pdf

Description:: THREE PHASE SENSORLESS FAN DRIVE

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Product details

Overview

A89304KETJSR from Allegro MicroSystems is a sensorless BLDC fan driver IC designed for high-temperature automotive thermal management. It integrates sinusoidal motor control, closed-loop speed regulation, low-R_DS(ON) MOSFETs, and EEPROM-configurable speed curves-enabling fan systems to operate reliably from –40 °C to +150 °C junction temperature in ADAS CPU, radar, and HUD cooling applications.

For engineers reviewing the A89304KETJSR datasheet, A89304KETJSR pinout, A89304KETJSR application, or A89304KETJSR equivalent, key selection considerations include its AEC-Q100 qualification, I²C programmability, 24 kHz PWM output, FG tachometer feedback, and support for analog/PWM speed input with ±0.5% duty threshold accuracy.

Technical Context

The A89304KETJSR implements a fully integrated sensorless sinusoidal commutation algorithm with Zero Torque Position Detection (ZTPD) and Automatic Phase Advance, eliminating Hall sensors while improving startup reliability and high-speed efficiency. Its embedded charge pump supports gate drive up to V_BB + 8 V, enabling robust operation across 4–40 V supply range.

Control is configurable via EEPROM-mapped parameters-including speed curve slope, lock timeout (0–25.5 s), slew rate (100/150 ns), and dual-slope or staircase profiles-and accessible through I²C (7-bit address 0x55) using SPD/SCL and FG/SDA pins. Standby mode draws only 10–50 µA when SPD is held low.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	4 V to 40 V - supports wide-input automotive battery systems including cold-crank and load-dump conditions
Operating Temperature	–40 °C to +150 °C (T_A) - qualified per AEC-Q100 Grade 0 for under-hood and ADAS module placement
Motor Output Current	3.6 A peak - sufficient for driving 12 V, 30 W+ brushless fans without external FETs
R_DS(ON) (Total)	510 mΩ typ. at 25 °C / 855 mΩ max. at 150 °C - enables efficient thermal performance in compact 5 mm × 5 mm QFN
PWM Frequency	24.5 kHz typ. - reduces audible noise and EMI compared to trapezoidal drivers
I²C Interface	Fast-mode (400 kHz), 7-bit address 0x55 - allows real-time speed command (REG 165), fault readback, and EEPROM programming
Speed Input Options	PWM duty cycle (34–65 kHz) or analog voltage (0.43–2.49 V) - selectable via EEPROM bit SPDSEL
Protection Features	Lock detection, overcurrent (3.94 A latched), overvoltage (19 V or 38 V), thermal shutdown (175 °C), and UVLO - ensures fail-safe operation in harsh environments

Pinout & Package

Package: 28-contact QFN (ET), 5 mm × 5 mm × 0.90 mm with exposed thermal pad and wettable flank - optimized for high-power density and PCB-level thermal dissipation (R_θJA = 40 °C/W on 2-layer board).

Pin/Terminal	Circuit Role	Design Meaning
OUTA / OUTB / OUTC	Motor phase outputs	Three half-bridge terminals driving BLDC motor windings; support sinusoidal modulation and 3.6 A peak current
VBB	Main power supply input	4–40 V input with undervoltage lockout (UVLO) thresholds at 3.85 V and 8.65 V; powers internal logic and gate drivers
GND	Ground reference	Primary ground return for power, logic, and motor circuits; connects to exposed thermal pad
SPD	Speed demand input / I²C clock	Accepts PWM or analog speed command; doubles as SCL line for I²C configuration and real-time control
FG	Tachometer output / I²C data	Open-drain RPM feedback signal (30 × f_FG = RPM); functions as SDA line for bidirectional I²C communication
nFAULT	Fault status output	Active-low open-drain signal indicating thermal shutdown, OCP, OVP, VCP UVLO, rotor lock, or V_DS fault
CP1 / CP2 / VCP	Charge pump terminals	Support external capacitor network to generate boosted gate drive voltage (V_CP = V_BB + 7.2 V typ.)
LSS	Low-side source connection	Provides Kelvin sense path for accurate current monitoring and overcurrent protection
VREF	Internal reference output	3.3 V ±150 mV reference for external circuitry; includes UVLO (2.9–3.15 V) and 120 mA overcurrent limit
TEST	Startup diagnostic output	Open-drain signal high at end of open-loop startup; low during motor off or fault condition

Key Features

Feature	Design Value
Sensorless sinusoidal control	Eliminates Hall sensors and associated PCB routing; reduces system BOM and improves reliability in vibration-prone environments
ZTPD + Automatic Phase Advance	Enables reliable startup under load and improves motor efficiency >90% at high speed by optimizing commutation timing
Configurable speed curves	EEPROM-programmable linear, staircase, or dual-slope profiles - supports custom fan laws for acoustic and thermal optimization
I²C serial interface (0x55)	Enables runtime speed adjustment, fault diagnostics, and EEPROM reconfiguration without MCU involvement or firmware update
Integrated protection suite	Combines lock detection with restart, thermal shutdown (175 °C), OCP/OVP, and slew-rate control - reduces need for external supervision circuitry
Low-power standby mode	Draws ≤50 µA when SPD held low - extends battery life in always-on vehicle modules during ignition-off states

Applications

ADAS Radar Cooling	Lidar Thermal Management
Use Scenario: Active cooling of 77 GHz radar transceivers in front-end modules where ambient temperatures exceed 105 °C and airflow is constrained. IC Role / Device Role / Timing Role: Sensorless BLDC driver providing closed-loop speed control and FG-based RPM verification for thermal regulation. Use Value: Enables continuous operation at junction temperatures up to 150 °C while maintaining <±0.5% speed accuracy and <25 dBA acoustic noise.	Use Scenario: Compact, high-reliability fan control for solid-state lidar units requiring precise thermal stability to maintain beam alignment and ranging accuracy. IC Role / Device Role / Timing Role: Integrated motor controller with ZTPD-assisted startup and EEPROM-tuned speed ramping to avoid mechanical resonance. Use Value: Reduces system footprint by eliminating MCU and external gate drivers; supports 24 kHz sinusoidal drive for minimal vibration-induced optical jitter.
HUD Projection Module	Infotainment SoC Cooling
Use Scenario: Quiet, responsive cooling for head-up display projection engines where fan noise directly impacts driver experience and thermal drift affects image focus. IC Role / Device Role / Timing Role: Analog/PWM-configurable speed controller with dither-enabled startup and soft-start to prevent torque shock during ignition-on transition. Use Value: Achieves <30 dBA acoustic performance via 24 kHz sinusoidal modulation and programmable slew rate; supports rapid thermal response with <1 s full-speed ramp.	Use Scenario: High-efficiency thermal management for infotainment domain controllers operating in dash-mounted enclosures with limited airflow and elevated ambient temperatures. IC Role / Device Role / Timing Role: AEC-Q100-qualified fan driver with I²C telemetry (die temp, fault status) for predictive thermal throttling in software-defined vehicle architectures. Use Value: Delivers real-time thermal feedback (via REG 138) and configurable lock timeout to prevent false shutdowns during transient load spikes.

ADAS Radar Cooling

Lidar Thermal Management

Use Scenario: Active cooling of 77 GHz radar transceivers in front-end modules where ambient temperatures exceed 105 °C and airflow is constrained.

IC Role / Device Role / Timing Role: Sensorless BLDC driver providing closed-loop speed control and FG-based RPM verification for thermal regulation.

Use Value: Enables continuous operation at junction temperatures up to 150 °C while maintaining <±0.5% speed accuracy and <25 dBA acoustic noise.

Use Scenario: Compact, high-reliability fan control for solid-state lidar units requiring precise thermal stability to maintain beam alignment and ranging accuracy.

IC Role / Device Role / Timing Role: Integrated motor controller with ZTPD-assisted startup and EEPROM-tuned speed ramping to avoid mechanical resonance.

Use Value: Reduces system footprint by eliminating MCU and external gate drivers; supports 24 kHz sinusoidal drive for minimal vibration-induced optical jitter.

HUD Projection Module

Infotainment SoC Cooling

Use Scenario: Quiet, responsive cooling for head-up display projection engines where fan noise directly impacts driver experience and thermal drift affects image focus.

IC Role / Device Role / Timing Role: Analog/PWM-configurable speed controller with dither-enabled startup and soft-start to prevent torque shock during ignition-on transition.

Use Value: Achieves <30 dBA acoustic performance via 24 kHz sinusoidal modulation and programmable slew rate; supports rapid thermal response with <1 s full-speed ramp.

Use Scenario: High-efficiency thermal management for infotainment domain controllers operating in dash-mounted enclosures with limited airflow and elevated ambient temperatures.

IC Role / Device Role / Timing Role: AEC-Q100-qualified fan driver with I²C telemetry (die temp, fault status) for predictive thermal throttling in software-defined vehicle architectures.

Use Value: Delivers real-time thermal feedback (via REG 138) and configurable lock timeout to prevent false shutdowns during transient load spikes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar sensorless BLDC fan driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP6532GQ-Z	3-phase gate driver only (no integrated MOSFETs or closed-loop control); requires external MCU and position sensing	Targeted at custom motor control designs with existing firmware infrastructure; lacks EEPROM, FG output, and AEC-Q100 qualification	Select when full control flexibility is needed and system already includes MCU-based speed regulation and thermal management logic
DRV10983ZRSMT	Integrated sensorless BLDC driver with 2-A rating, 12-V max supply, and no I²C interface; uses one-time-programmable (OTP) memory instead of EEPROM	Designed for cost-sensitive consumer electronics; not AEC-Q100 qualified and rated only to 125 °C junction	Select for non-automotive applications where lower current (2 A), fixed configuration, and absence of field reprogramming are acceptable

Compared with MP6532GQ-Z and DRV10983ZRSMT, the A89304KETJSR uniquely combines AEC-Q100 Grade 0 qualification, 3.6-A integrated power stage, field-updatable EEPROM, and dual-function I²C (SPD/FG pins), making it the only option supporting zero-MCU, high-temperature, and reconfigurable fan control in automotive ADAS modules.

Availability

A89304KETJSR is available at Aetrix Electronics and suitable for ADAS radar cooling, lidar thermal management, and HUD projection module applications requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for A89304KETJSR 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 automotive-grade motion control, current sensing, and motor driver technologies.

The A89304 product line was developed specifically for high-temperature, sensorless BLDC fan control in next-generation ADAS and electrified vehicle subsystems-emphasizing integration, configurability, and functional safety readiness.

FAQ

What is the maximum motor current supported by the A89304KETJSR?

The A89304KETJSR supports a peak output current of 3.6 A, with total driver R_DS(ON) specified at 510 mΩ typical (25 °C) and 855 mΩ maximum (150 °C). This enables direct drive of 12 V, 30–40 W BLDC fans without external MOSFETs, and is validated under AEC-Q100 stress conditions including thermal cycling and high-temperature operating life.

Does the A89304KETJSR require an external microcontroller?

No, the A89304KETJSR eliminates the need for an external microcontroller by integrating closed-loop speed control, sensorless commutation algorithms (ZTPD and Automatic Phase Advance), EEPROM-based configuration storage, and I²C serial interface. System-level speed commands can be delivered via PWM duty cycle, analog voltage, or direct I²C register writes to address 165 - all without MCU intervention.

How is speed feedback provided by the A89304KETJSR?

The A89304KETJSR provides speed feedback via the open-drain FG pin, which outputs a pulse train where RPM = 30 × f_FG. The electrical frequency f_ELEC relates to FG frequency as f_ELEC = f_FG × (Number of Pole Pairs) / 2. Additionally, FG serves as the I²C SDA line, enabling real-time readback of actual applied duty (REG 128) and die temperature (REG 138).

What package type and thermal characteristics does the A89304KETJSR use?

The A89304KETJSR is housed in a 28-contact QFN (ET package), measuring 5 mm × 5 mm × 0.90 mm with an exposed thermal pad and wettable flank. Its thermal resistance is R_θJA = 40 °C/W on a 2-layer PCB with 1-in² copper, enabling reliable operation up to 150 °C junction temperature - verified per AEC-Q100 Grade 0 requirements.

Can the A89304KETJSR be configured for different speed vs. input profiles?

Yes, the A89304KETJSR supports multiple configurable speed curves stored in on-chip EEPROM, including linear (slope/offset), staircase (4-step), and dual-slope profiles. These are programmed via I²C using Allegro's EVB and GUI tools, and allow tuning for acoustic optimization, thermal response, or directional control - all without changing hardware or firmware.

A89304KETJSR Specifications

Product attributes: Attribute value

Manufacturer:: Allegro MicroSystems

Series:: -

Package/Case:: 28-VFQFN Exposed Pad

Packaging:: Bulk

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:: Analog, I2C, PWM

Technology:: Power MOSFET

Step Resolution:: -

Applications:: Fan Motor Driver

Current - Output:: 3.6A

Voltage - Supply:: 40V

Voltage - Load:: 40V

Operating Temperature:: -40°C ~ 150°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: 28-QFN (5x5)

A89304KETJSR FAQ

1.How can I place an order for A89304KETJSR through Aetrix?

Please submit a Request for Quotation (RFQ) for A89304KETJSR 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 A89304KETJSR reliable?

The price and inventory of A89304KETJSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A89304KETJSR is usually 5 days.

3.What payment methods are accepted for A89304KETJSR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A89304KETJSR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A89304KETJSR?

A89304KETJSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A89304KETJSR 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 A89304KETJSR?

For technical support, including A89304KETJSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A89304KETJSR requirements.

6.How does Aetrix verify that A89304KETJSR is sourced from the original manufacturer or authorized distributors?

All A89304KETJSR 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 A89304KETJSR meets industry standards.

7.What is the process for return or replacement of A89304KETJSR?

All A89304KETJSR units undergo pre-shipment inspection (PSI). If there is an issue with A89304KETJSR, 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 A89304KETJSR part is unused and in its original packaging.

Return procedure for A89304KETJSR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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