L9906 - 3-Phase BLDC Motor Driver | STMicroelectronics | 64-TQFP
MPN: L9906 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.12 | $3,060.00 |
| 1,000 | $5.5 | $5,500.00 |
L9906 Overview
A motor driver IC is a power management integrated circuit that translates low-power control signals from a microcontroller into high-current signals capable of driving motor windings. In a BLDC motor system, the driver controls the commutation sequence of the three phases, ensuring smooth rotation and efficient operation. The L9906 sits between the microcontroller and the power stage, providing the necessary gate drive, protection, and diagnostic functions.
Key features of the L9906 include support for 3-phase BLDC motors, integrated gate drivers for external MOSFETs, and a wide operating voltage range suitable for 12V automotive systems. The device offers thermal shutdown protection, current sensing, and diagnostic feedback, enhancing system reliability. Its low electromagnetic emission design helps meet automotive EMC standards.
The L9906 utilizes a sophisticated architecture that includes charge pumps for high-side gate drive, current sense amplifiers, and protection circuits. The device is designed to operate in harsh environments, with a junction temperature range of -40°C to +150°C. The 64-pin TQFP package offers good thermal performance and is suitable for surface-mount assembly.
Typical applications include automotive engine cooling fans, electric power steering, and industrial motor control. The L9906 is also used in HVAC blowers and pumps, where reliable and efficient motor control is essential. Its robust design and comprehensive protection features make it a preferred choice for demanding applications.
When designing with the L9906, ensure proper PCB layout to minimize parasitic inductance and optimize thermal dissipation. The device requires careful selection of external MOSFETs and bootstrap capacitors to achieve optimal performance. Refer to the STMicroelectronics application notes for detailed design guidelines.
Drop-in alternatives for L9906 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with L9906 (same form factor and footprint) — differing in Operating Temperature Range, Package, Protection Features.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
L9906TR
✅ Drop-In📋 Reference alternative (not in catalog)
L9907
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
L9906 Maximum Ratings & Electrical Characteristics
| Motor Type | 3-Phase BLDC |
| Output Configuration | External N-Channel MOSFETs |
| Package | 64-TQFP |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40°C to +150°C |
| Number of Pins | 64 |
| Gate Drive | Integrated |
| Protection Features | Thermal Shutdown, Current Sensing |
| EMI | Low Electromagnetic Emissions |
| RoHS Status | Compliant |
| REACH Status | Compliant |
| AEC-Q100 | Qualified |
| Lead-Free | Yes |
L9906 Pin Configuration
| Pin 1 | VCC — Power supply |
| Pin 2 | GND — Ground |
| Pin 3 | HIN1 — High-side gate drive input for phase 1 |
| Pin 4 | LIN1 — Low-side gate drive input for phase 1 |
| Pin 5 | HIN2 — High-side gate drive input for phase 2 |
| Pin 6 | LIN2 — Low-side gate drive input for phase 2 |
| Pin 7 | HIN3 — High-side gate drive input for phase 3 |
| Pin 8 | LIN3 — Low-side gate drive input for phase 3 |
| Pin 9 | EN — Enable pin |
| Pin 10 | DIAG — Diagnostic output |
| Pin 11 | CS — Current sense input |
| Pin 12 | VREG — Regulated voltage output |
Typical Applications
L9906 is suitable for 6 applications: Automotive Engine Cooling Fan, Electric Power Steering, HVAC Blower, Industrial Motor Control, Pumps, Robotics.
Automotive Engine Cooling Fan
The L9906 drives the BLDC motor of engine cooling fans, providing efficient and reliable operation. Its integrated gate drivers and protection features ensure robust performance in high-temperature under-hood environments. The low EMI design helps meet automotive EMC standards, and the AEC-Q100 qualification guarantees reliability for automotive use.
Recommended
Electric Power Steering
In electric power steering systems, the L9906 provides precise control of the BLDC motor that assists steering. Its high-current gate drivers and current sensing enable accurate torque control, while thermal shutdown protects the system under heavy load. The compact 64-TQFP package fits into space-constrained steering column modules.
Recommended
HVAC Blower
The L9906 is used in HVAC blowers to drive the BLDC motor that circulates air. Its low electromagnetic emissions reduce interference with other vehicle electronics, and its wide operating temperature range ensures reliable operation in various climates. The integrated protection features enhance system safety.
Recommended
Industrial Motor Control
In industrial applications, the L9906 drives BLDC motors for conveyor belts, pumps, and fans. Its robust design and protection features ensure long-term reliability in harsh environments. The device's low EMI helps comply with industrial EMC standards, and its compact package simplifies PCB design.
Recommended
Pumps
The L9906 is suitable for driving BLDC motors in various pump applications, such as water pumps and oil pumps. Its current sensing capability allows for precise speed control and overload detection. The device's thermal shutdown protection prevents damage in case of excessive heat.
Recommended
Robotics
In robotics, the L9906 drives BLDC motors for joint actuation and movement. Its high-performance gate drivers enable smooth and precise motor control, essential for robotic applications. The compact package and low EMI make it suitable for integration into robotic systems.
Recommended
Recommended Products Summary
Engineering reference data for L9906 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9906TR | L9907 |
|---|---|---|---|
| Package | 64-TQFP | 64-TQFP | 64-TQFP |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Motor Type | 3-Phase BLDC | 3-Phase BLDC | 3-Phase BLDC |
Key Differentiators
- AEC-Q100 qualified for automotive use (vs L9907)
- Low electromagnetic emissions (vs L9907)
- Integrated gate drivers and protection (vs L9907)
Design Notes
Ensure proper PCB layout for the L9906 to minimize parasitic inductance and optimize thermal dissipation. Place the device on a copper pour with adequate thermal vias to enhance heat transfer. Keep high-current paths short and wide to reduce voltage drops and EMI.
The L9906 can dissipate significant power when driving motors. Ensure adequate thermal management by using a heatsink or a large copper area on the PCB. The junction temperature must not exceed 150°C. Calculate power dissipation based on the motor current and supply voltage.
Select external MOSFETs with appropriate voltage and current ratings for the motor application. Use bootstrap capacitors with sufficient capacitance for high-side gate drive. Ensure the supply voltage is within the specified range to avoid damage. Refer to the STMicroelectronics application notes for detailed design guidelines.
Compliance Information
RoHS and REACH compliance are indicated in the datasheet. AEC-Q100 qualification is confirmed for automotive use.
