Brushless DC motors (BLDC), or electronically commutated motors (ECMs) have become more relevant in today’s environment where efficiency and minimizing power losses are a key objective of designs in all markets. Brushless DC motors provide significant improvements in efficiency, mechanical reliability, and offer superb torque-to-weight properties.
Allegro MicroSystems plays a key role in enabling brushless DC motor adoption by simplifying the complexities of electronic commutation. Allegro offers a range of products targeted at BLDC applications which span the industrial, consumer, and automotive markets. Depending on the needs of a given application, Allegro products can offer integrated features such as:
- Self commutating six-step / trapezoidal state machine with Hall sensor inputs
- Sensorless and sinusoidal commutation
- Back EMF sensing capability
- Automotive grade ICs with diagnostics and robust protection features
| MOSFET Gate Driver ICs |
| Part Number |
Output Voltage Range (V) |
Output Current |
Number of Bridges |
Key Spec |
Interface |
Packages |
| A3946K |
7 to 60 |
>10 A Typical |
Half bridge |
Diagnostics, High current gate drive, Top off charge pump |
Parallel |
e-TSSOP-16 |
| A3932 |
12 to 50 |
<25 A Typical |
Three half bridges |
Hall commutation logic, PWM current control, Tach output |
Parallel |
TSSOP-38 |
| A3938 |
12 to 50 |
<25 A Typical |
Three half bridges |
A3932 with selectable coast or brake on power-down |
Parallel |
TSSOP-38 |
| A3930/31K |
7 to 50 |
>10 A Typical |
Three half bridges |
Hall commutation logic, PWM current control, diagnostics |
Parallel |
eLQFP-48 |
| A4933K |
7 to 50 |
>10 A Typical |
Three half bridges |
Diagnostics and sense amplifier, Pin compatible to A4935, Higher current gate drive |
Parallel |
eLQFP-48 |
| A4935K |
7 to 50 |
>10 A Typical |
Three half bridges |
Diagnostics and sense amplifier, Top off charge pump |
Parallel |
eLQFP-48 |
| A4960K |
7 to 50 |
>10 A Typical |
Three half bridges |
Sensorless commutation, Programmable startup and run parameters and diagnostics |
Parallel and SPI |
eLQFP-32 |
| A4910K |
5.5 to 50 |
>10 A Typical |
Three half bridges |
Programmable parameters, Diagnostics, 3x Sense amplifiers |
Parallel and SPI |
eLQFP-48 |
| A4915 |
5 to 50 |
>10 A Typical |
Three half bridges |
Hall commutation logic, Analog speed input, Center aligned PWM |
Parallel |
TSSOP-28, 5 × 5 mm QFN-28 |
| A4931 |
8 to 38 |
<10 A Typical |
Three half bridges |
Hall commutation logic, PWM current control, Lock detect, FG output |
Parallel |
5 × 5 mm QFN-28 |
| A4936 |
8 to 38 |
<10 A Typical |
Three half bridges |
A4931 with FG amplifier |
Parallel |
5 × 5 mm QFN-32 |
| A4938 |
8 to 38 |
<10 A Typical |
Three half bridges |
A4931 with over voltage select, 5 V Hall bias z |
Parallel |
5 × 5 mm QFN-28 |
| A4930 |
8 to 36 |
<10 A Typical |
Single full bridge |
Single phase Hall commutation logic, PWM current control, Soft-start |
Parallel |
5 × 5 mm QFN-28 |
| Integrated MOSFET ICs |
| Part Number |
Output Voltage Range (V) |
Output Current |
Number of Bridges |
Key Spec |
Interface |
Packages |
| A4941/41-A |
4.5 to 20 |
1.25 A |
Three half bridges |
Sensorless commutation, Integrated DMOS, OCP, Soft-switching, -A is AEC-Q100 |
Parallel |
e-TSSOP-16 |
| A3907 |
2.3 to 5.5 |
102 mA |
One linear sink driver |
VCM driver with 10-bit D-to-A converter, Current ramp control |
PC |
WLCSP-6 1.4 × 0.97 mm |
Note: "K" suffix denotes automotive grade product (AEC-Q100 qualified)