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High-Performance Power ICs and Hall-Effect Sensors
Brushless DC Motor Drivers, Brush DC Motor Drivers,
and Stepper Motor Drivers 
Driver and controller ICs are also produced by Allegro for fractional horsepower dc, stepper and brushless dc motors in the industrial and automotive markets. BCD technology gives Allegro an advantage in higher power applications and allows expansion in existing markets and associated applications such as large tape drives, automotive blowers, power steering motors, and factory automation.
Power Motor Drivers Selection Guides
| Part Number | Output Voltage Range | Output Current | Number of Bridges | Output | Interface | Logic Supply Voltage Range | Motor Type | Packages | Key Features |
|---|---|---|---|---|---|---|---|---|---|
| A3904 | 2.4 V to 5.5 V | 127 mA | One linear sink driver | Linear MOSFET | I2C | Internally generated | Voice coil | DFN-6, Bare die, WLCSP-6 | 8 bit D to A, 1 × 0.7 WLCSP, internal sense resistor |
| A4930 | 8 V to 36 V | 1 to 10 A Typ | Single full bridge | MOSFET gate driver | Parallel | Internally generated | Single-phase BLDC fan | 5 × 5 DFN-28 |
Dead time protection, FG, RD outputs, lock protection, soft start, Hall element input, PWM current limit |
| A4931 | 8 V to 38 V | 1 to 10 A Typ | Three half bridges | MOSFET gate driver | Parallel | Internally generated | Three-phase brushless | 5 × 5 DFN-28 |
PWM current limit, FG out, Hall element input, locked rotor protection, UVLO, TSD |
| A3932 | 12 V to 50 V | 2 to 25 A Typ | Three half bridge gate drivers | MOSFET gate driver | Parallel | Internally generated | Three-phase brushless | TSSOP-38 | SR, tach, fault output, power MOSFET protection, brake, PWM |
| A3936 | 9 V to 50 V | 3 A | Three half bridges | DMOS | Parallel | 3 V to 5.5 V | Three-phase brushless | PLCC-44 | Hall commutation logic, sleep, SR, MD, brake, tach, PWM |
| A3938 | 12 V to 50 V | 2 to 25 A Typ | Three half bridge gate drivers | MOSFET gate driver | Parallel | Internally generated | Three-phase brushless | TSSOP-38 | SR, fault output, power MOSFET protection, power loss brake, PWM |
| A8904 | 4 V to 14 V | 1.2 A | Three half bridges | DMOS | Serial | 4.5 V to 5.5 V | Three-phase brushless | SOIC-24, eTSSOP-28 | Sensorless commutation, FLL speed control, linear current control |
Note: SR = Synchronous rectification; Tach = Tachometer output; FLL = Frequency locked loop; OCP = Over-current protection; DAC = Digital-to-analog converter; MD = Mixed decay; SPI = serial peripheral interface; EMI = Electromagnetic interference; Sleep = Low power mode
| Part Number | Output Voltage Range | Output Current | Number of Bridges | Output | Interface | Logic Supply Voltage Range | Motor Type | Packages | Key Features |
|---|---|---|---|---|---|---|---|---|---|
| A3949 | 8 V to 36 V | 2.8 A | Single full | DMOS | Parallel | Internally generated | DC brush | SOIC-16, eTSSOP-16 | Sleep, internally generated logic supply |
| A3950 | 8 V to 36 V | 2.8 A | Single full | DMOS | Parallel | Internally generated | DC brush | eTSSOP-16, QFN-16 | OCP, fault output, sleep, internally generated logic supply |
| A3953 | Vcc to 50 V | 1.3 A | Single full | Bipolar | Parallel | 3 V to 5.5 V | DC brush | DIP-16, SOIC-16 | Sleep, fast/slow decay, brake, Satlington® sink outputs, PWM |
| A3955 | Vcc to 50 V | 1.5 A | Single full | Bipolar | Parallel | 4.5 V to 5.5 V | MicroStepper (up to 8 steps/full step) | DIP-16, SOIC-16 | 3-bit DAC, MD, Satlington® sink outputs, PWM |
| A3959 | 9.5 V to 50 V | 3 A | Single full | DMOS | Parallel | 4.5 V to 5.5 V | DC brush | DIP-24, SOIC-24, eTSSOP-28 | Slow/fast/mixed decay, SR, sleep, brake, PWM |
| A3964 | 5 V to 30 V | 800 mA | Dual full | Bipolar | Parallel | 4.75 V to 5.25 V | Stepper | DIP-24, SOIC-24 | 2.5 V reference, PWM |
| A3966 | Vcc to 30 V | 650 mA | Dual full | Bipolar | Parallel | 4.75 V to 5.5 V | Stepper | SOIC-16 | Full, half, Satlington® sink outputs, PWM |
| A3967 | 4.75 V to 30 V | 750 mA | Dual full | Bipolar | Parallel (Translator) | 3 V to 5.5 V | MicroStepper (up to 8 steps/full step) | SOIC-24 | Two-wire (Step/DIR) interface, MD, sleep, Satlington® sink outputs, PWM |
| A3968 | Vcc to 30 V | 650 mA | Dual full | Bipolar | Parallel | 4.75 V to 5.5 V | DC brush | SOIC-16 | Brake function, Satlington® sink outputs, PWM |
| A3969 | 5 V to 30 V | 650 mA | Dual full | Bipolar | Parallel | 3 V to 3.6 V | Stepper | QFN-28 | Full, half, Satlington® sink outputs, PWM |
| A3972 | 15 V to 50 V | 1.5 A | Dual full | DMOS | Serial | 4.5 V to 5.5 V | MicroStepper (up to 32 steps/full step) | DIP-24 | 6-bit DAC, SPI, SR, MD, DT, sleep, PWM |
| A3973 | 15 V to 35 V | 1 A | Dual full | DMOS | Serial | 4.5 V to 5.5 V | MicroStepper (up to 32 steps/full step) | DIP-24, SOIC-24 | 6-bit DAC, MD, SPI, SR, sleep, PWM |
| A3974 | 15 V to 50 V | 1.5 A | Dual full | DMOS | Serial | 4.5 V to 5.5 V | DC brush | PLCC-44 | MD, sleep, SPI, SR, brake function |
| A3977 | 8 V to 35 V | 2.5 A | Dual full | DMOS | Parallel (Translator) | 3 V to 5.5 V | MicroStepper (up to 8 steps/full step) | PLCC-44, eTSSOP-28 | Two-wire (step/DIR) interface, MD, sleep, SR, PWM |
| A3979 | 8 V to 35 V | 2.5 A | Dual full | DMOS | Parallel (Translator) | 3 V to 5.5 V | MicroStepper (up to 16 steps/full step) | eTSSOP-28 | Two-wire (step/DIR) interface, MD, sleep, SR, PWM |
| A3982 | 8 V to 35 V | 1.5 A | Dual full | DMOS | Parallel (Translator) | 3 V to 5.5 V | Stepper full/half step | SOIC-24 | Two-wire (step/DIR) interface, MD, sleep, SR, PWM, 2 A peak |
| A3983 | 8 V to 35 V | 1.5 A | Dual full | DMOS | Parallel (Translator) | 3 V to 5.5 V | MicroStepper (up to 8 steps/full step) | eTSSOP-24 | Two-wire (step/DIR) interface, MD, sleep, SR, PWM, 2.5 A peak |
| A3984 | 8 V to 35 V | 1.5 A | Dual full | DMOS | Parallel (Translator) | 3 V to 5.5 V | MicroStepper (up to 16 steps/full step) | eTSSOP-24 | Two-wire (step/DIR) interface, MD, sleep, SR, PWM, 2 A peak |
| A3985 | 12 V to 50 V | 2 A to 10 A Typ | External dual full | MOSFET gate driver | Serial | 3 V to 5.5 V | MicroStepper (up to 32 steps/full step) | TSSOP-38 | Serial interface, sleep, 6-bit linear DACs, PWM, SR, MD |
| A3986 | 12 V to 50 V | 2 A to 10 A Typ | External dual full | MOSFET gate driver | Parallel (Translator) | 3 V to 5.5 V | MicroStepper (up to 16 steps/full step) | TSSOP-38 | Two-wire (Step/Dir) interface, sleep, DAC, PWM, SR, MD |
| A3987 | 8 V to 50 V | 1.5 A | Dual full | DMOS | Parallel (Translator) | 3 V to 5.5 V | MicroStepper (up to 16 steps/full step) | eTSSOP-24 | Two-wire (Step/Dir) interface, MD, sleep, SR, PWM, OCP |
| A3988 | 8 V to 36 V | 1.2 A | Quad full | DMOS | Parallel | 3 V to 5.5 V | MicroStepper (up to 4 steps/full step) | QFN-36, eLQFP-48 | 2-bit DAC, MD, PWM, drop-in (not pin to pin) for two L6218 (A2916) |
| A3989 | 8 V to 36 V | 1.2 A (step), 2.4 A (DC) |
Three full | DMOS | Parallel | 3 V to 5.5 V | MicroStepper and DC Brush (up to 4 steps/full step) | QFN-36 | 2-bit DAC, MD, PWM, drop-in (not pin to pin) for two L6218 (A2916), brake, fast/slow decay |
| A3992 | 15 V to 50 V | 1.5 A | Dual full | DMOS | Serial | 4.5 V to 5.5 V | MicroStepper (up to 32 steps/full step) | DIP-24, eTSSOP-24 | 6-bit DAC, MD, SPI, SR, sleep, PWM, OCP |
| UDx2916 | 10 V to 45 V | 750 mA | Dual full | Bipolar | Parallel | 4.75 V to 5.25 V | MicroStepper (up to 4 steps/full step) | DIP-34, SOIC-24, PLCC-44 | Internal PWM current control, 2-bit DAC |
| L6219 | 10 V to 45 V | 750 mA | Dual full | Bipolar | Parallel | 4.75 V to 5.25 V | MicroStepper (up to 4 steps/full step) | DIP-34, SOIC-24, PLCC-44 | Internal PWM current control, 2-bit DAC |
| A3901 | 2.5 V to 5.5 V | 400 mA | Dual full | MOSFET | Parallel | Internally generated | Stepper or DC brush | DFN-10 | Full, half, brake, sleep, 3 × 3 × 0.75 mm DFN |
| A3903 | 2.5 V to 5.5 V | 500 mA | Single full | MOSFET | Parallel | Internally generated | DC brush | DFN-8 | Forward, reverse, brake, standby, linear voltage control 2 × 2 × 0.55 mm DFN |
| A3906 | 2.5 V to 9 V | 1 A | Dual full | MOSFET | Parallel | Internally generated | Stepper or DC brush | QFN-20 | Full, half, brake, sleep, UVLO, low RDS(on), internal PWM current control, peak current flag outputs, SR |
| A3904 | 2.4 V to 5.5 V | 127 mA | Voice coil driver | MOSFET | I2C | 1.8 V to 5.5 V | Voice coil | DFN-6, wafer, WLCSP | 8 bit DAC, 500 µA resolution, small package footprint, sleep |
| A3995 | 8 V to 36 V | 2.4 A | Dual full | DMOS | Parallel | 3 V to 5.5 V | DC brush | QFN-36 | Brake, fast/slow decay, SR, PWM |
| A4983 | 8 V to 35 V | 2 A | Dual full | DMOS | Parallel (Translator) | 3 V to 5.5 V | MicroStepper (up to 16 steps/full step) | QFN-28 | Two-wire (step/DIR) interface, MD, sleep, SR, PWM, 2 A peak |
| Part Number | Output Voltage Range | Output Current | Number of Bridges | Output | Interface | Logic Supply Voltage Range | Motor Type | Packages | Key Features |
|---|---|---|---|---|---|---|---|---|---|
| A3941 | 7 V to 50 V | n/a | Single full | MOSFET gate driver | Parallel | Internally generated | DC brush | eTSSOP-28 | Automotive temperatures, automotive diagnostics, small outline thermally enhanced package |
| A4940 | 7 V to 50 V | n/a | Single full | MOSFET gate driver | Parallel | 3.0 V to 5.5 V | DC brush | eTSSOP-24 | Automotive temperatures, small outline thermally enhanced package, independent control of MOSFETs |
| A3946 | 7 V to 60 V | n/a | Half bridge | MOSFET gate driver | Parallel | Internally generated | DC brush | SOIC-16, eTSSOP-16 | Automotive temperature, charge pump for low battery operation, fault output, 60 V operation |
| A3980 | 7 V to 50 V | 1 A | Dual full | DMOS | Parallel (Translator) | 3 V to 5.5 V | MicroStepper (up to 16 steps/full step) | eTSSOP-28 | Protected output drivers, two-wire (step/DIR) interface, fault reporting |
| UDQ2916 | 10 V to 45 V | 750 mA | Dual full | Bipolar | Parallel | 4.75 V to 5.25 V | Stepper | DIP-24, SOIC-24, PLCC-44 | Internal PWM current control, 2-bit DAC |
| Part Number | Output Voltage Range | Output Current | Number of Bridges | Output | Interface | Logic Supply Voltage Range | Motor Type | Packages | Key Features |
|---|---|---|---|---|---|---|---|---|---|
| A3930 | 7 V to 50 V | n/a | Three half bridges | MOSFET Gate Driver | Hall-based state machine | Internally generated | Three-phase brushless | eLQFP-48 | Hall commutation logic, sleep, SR, MD, brake, tach, PWM, fault output |
| A3931 | 7 V to 50 V | n/a | Three half bridges | MOSFET Gate Driver | Hall-based state machine | Internally generated | Three-phase brushless | eLQFP-48 | Hall commutation logic, sleep, SR, MD, brake, tach, PWM, fault output, prepositioning state |
| A3935 | 7 V to 40 V | n/a | Three half bridges | MOSFET Gate Driver | Parallel | 4.75 V to 5.25 V | Three-phase brushless | QSOP-36, eLQFP-48 | Automotive temperature, boost converter for low battery operation, fault output |
| A4935 | 7 V to 50 V | n/a | Three half bridges | MOSFET Gate Driver | Parallel | 3.0 V to 5.5 V | Three-phase brushless | eLQFP-48 | Automotive temperatures, Automotive diagnostics, Integrated charge pump |