Motor Driver ICs

Overview
Security
Printers
White Goods
Industrial
Consumer
Selection Guide

Overview

Allegro MicroSystems, LLC. offers an industry-leading portfolio of motor driver and controller ICs for brushless DC, brush DC, and stepper motors. Product architectures vary from highly-efficient internal DMOS drivers to MOSFET controller ICs suited for a wide variety of motor applications. Coupled with a strong system-level expertise, Allegro’s motor driver IC portfolio provides the user with a high-performance, leading-edge and reliable motor control solution.

Allegro's BCD (bipolar, CMOS and DMOS components) technology allows for a wide range of features that is well suited for today’s demanding motor control applications. Using the tabs, view key application uses for Allegro’s motor driver ICs:

Security
Printers
White Goods
Industrial
Consumer

Brushless DC Motor Drivers

Brush DC Motor Drivers

Stepper Motor Drivers

Internal DMOS outputs or gate controllers to drive external MOSFETs
Direct control of external MOSFETs
PWM or analog speed control
Sensorless- or Hall sensor-based commutation control
Six-step trapezoidal drive
Sinusoidal drive (Low audible noise)
High-speed operation
Robust protection features
Extensive diagnostics features

Low standby current for energy efficiency
Internal DMOS high-current outputs or gate controllers to driver external MOSFETs
Parallel interfaces with forward, reverse, coast, and brake modes
Strong protection and diagnostic features
Fixed off-time PWM current control

Step/Direction, Parallel and Serial interfaces
Microstepping current control
Low sleep-mode current
Diagnostic outputs
Robust protection features
Fixed off-time PWM current control
Slow, fast, and mixed current decay-mode control
Synchronous rectification

Design Tools and Application Support

Allegro Kit

Photo of Evaluation Board

Allegro Gui

Example GUI Software

Security

Accurate Position, Low Power and Wide Voltage Range Solutions

Closed Circuit Television (CCTV ) Pan/Tilt, Solar Lens Focus, Wipers	Electronic Keyless Lock

Featured Products: A3988 | A3909 | A3901

A3988 - Quad DMOS Full Bridge PWM Motor Driver

Benefits

Single integrated driver for PTZ Cameras
Control two bipolar stepper motors
Dual stepper motor driver in one package
Small footprint with limited external components

Part Number	Output Voltage Range (V)	Output Current Range	Interface	Packages
A3988	8 to 36	1.2 A	Parallel (I0, I1)	QFN-36, eLQFP-48

A3901 - Dual Full-Bridge Low-Voltage Motor Driver

Benefits

Integrated driver for electronic door locks and focus motors
Two DC or one stepper
Low-voltage operation
Small, thermally efficient packaging

Part Number	Output Voltage Range (V)	Output Current Range	Interface	Packages
A3901	2.5 to 5.5	400 mA	Parallel (I0, I1)	DFN-10

A3909 - Dual-Full Bridge Motor Driver

Benefits

Short-circuit protection
Low-power sleep mode

Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Logic Supply Voltage Range	Packages
A3909	4 to 18	1 A	Dual full	Internally generated	DFN-10

Printers

Large Portfolio of Stepper and DC Brush Motor Driver ICs

Copiers, Scanner and Printer	3D and Inkjet Printers

POS Printer	Portable POS Terminal

Featured Products: A4950 | A4952 | A4984 | A4988 | A4985 | A3906 | A4931

A4950 - Full-Bridge DMOS PWM Motor Driver

Benefits

Reduced external components
Small footprint
3.5 A output current
Overcurrent protection increases reliability

Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Logic Supply Voltage Range	Packages
A4950	8 to 40	3.5 A	Single full	Internally generated	SOICN-8

A4952 - Full-Bridge DMOS PWM Motor Driver

Benefits

Motor stall and short-circuit protection to protect motor and driver IC
Few external components
2 A output current
Latch or retry overcurrent modes
Low R_DS(on) outputs for low power dissipation

Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Logic Supply Voltage Range	Packages
A4952	8 to 40	2 A	Single full	Internally generated	MSOP-10

A4984 - DMOS Microstepping Driver with Translator and Overcurrent Protection

Benefits

Simple two-wire interface and multiple current options
2 A output
Simple step/direction interface with built-in translator
32-pin package for No Smoke, No Fire

Part Number	Output Voltage Range (V)	Output Current Range	Interface	Packages
A4984	8 to 35	2.0 A	Parallel (Translator)	QFN-24, QFN-32, eTSSOP-24

A4988 - DMOS Microstepping Driver with Translator and Overcurrent Protection

Benefits

Up to 16 microstep resolution for accurate positioning

Part Number	Output Voltage Range (V)	Output Current Range	Interface	Packages
A4988	8 to 35	2.0 A	Parallel (Translator)	QFN-25

A4985 - DMOS Microstepping Driver with Translator and Overcurrent Protection

Benefits

1 A output
Microstepping for low-audible-noise improved position accuracy

Part Number	Output Voltage Range (V)	Output Current Range	Interface	Packages
A4985	8 to 35	1.0 A	Parallel (Translator)	QFN-24, QFN-32, eTSSOP-24

A3906 - Low-Voltage Stepper and Single/Dual DC Motor Driver

Benefits

Ultra-low-voltage operation 2.5 V
Internal current control
Two DC or one stepper
Low-current sleep mode
Small 4 mm x 4 mm package

Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Logic Supply Voltage Range	Packages
A3906	2.5 to 9	1 A	Dual full	Internally generated	QFN-20

A4931 - 3-Phase DC Motor PreDriver

Benefits

Flexible BLDC with integrated motor sequencer for sensored motors
Integrated Hall state machine
Brushless motor gate driver
Motor lock detect protection

Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Interface	Packages
A4931	8 to 38	<10 A Typical	Three half bridges	Parallel	5 × 5 mm QFN-28

White Goods

Efficient, Low Audible Noise Performance

Coffee Maker/Blender	Gas Cook Tops

Refrigerator

Featured Products: A3909 | A4957 | A4979

A3909 - Dual Full-Bridge Motor Driver

Benefits

For refrigerator ice maker and damper control
Efficient low R_DS(on) output which can be paralleled for single high-current DC
Short-circuit protection

Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Logic Supply Voltage Range	Packages
A3909	4 to 18	1 A	Dual full	Internally generated	SSOP-10, MSOP-10

A4957 - Full-Bridge MOSFET Driver

Benefits

Fault output
High-current gate drive for external MOSFET bridge
Direct control for low-noise, high-efficiency control with external MCU

Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Logic Supply Voltage Range	Packages
A4957	4.5 to 50	>10 A Typical	Single full	3 V to 5.5 V	QFN-16

A4979 - Microstepping Programmable Stepper Motor Driver with Stall Detect and Short-Circuit Protection

Benefits

Simple two-wire step interface
Integrated programmable stall detection for safety critical applications
Overcurrent detection
Serial port for advanced diagnostics

Part Number	Output Voltage Range (V)	Output Current Range	Interface	Packages
A4979	7 to 50	1.5 A	SPI/Parallel (Translator)	eTSSOP-28

Industrial

Simplifies Design Implementation, Minimizes External Components, Wide Voltage, and Current Ranges

ATM Vending/Ticketing	Fan and Blower

Industrial Valve Control	Medical Devices
LPG and Nitrogen valves should consider the A4979 for increased diagnostics and stall detection

Featured Products: A4952 | A3918 | A3901 | A4979 | A4984 | A4960

A4952 - Full-Bridge DMOS PWM Motor Driver

Benefits

Stall current limit and overcurrent feature to protect motor and driver IC
Fault diagnostic output to detect system failures

Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Logic Supply Voltage Range	Packages
A4952	8 to 40	2 A	Single full	Internally generated	MSOP-10

A3918 - Low-Voltage DC Motor Driver

Benefits

Low-voltage DC motor drive for battery-operated valve control
Low-power sleep mode

Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Logic Supply Voltage Range	Packages
A3918	2.5 to 9	1 A	Single full	Internally generated	QFN-16

A3901 - Dual Full-Bridge Low-Voltage Motor Driver

Benefits

For lower power portable medical devices
Integrated driver for electronic door locks and focus motors
Two DC or one stepper
Low-voltage operation
Small, thermally efficient packaging

Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Logic Supply Voltage Range	Packages
A3901	2.5 to 5.5	400 mA	Dual full	Internally generated	DFN-10

A4979 - Microstepping Programmable Stepper Motor Driver with Stall Detect and Short-Circuit Protection

Benefits

Feature rich stepper motor driver for industrial applications
Integrated programmable stall detection for safety critical applications
Simple two-wire step interface
Overcurrent detection

Part Number	Output Voltage Range (V)	Output Current Range	Interface	Packages
A4979	7 to 50	1.5 A	SPI/Parallel (Translator)	eTSSOP-28

A4984 - DMOS Microstepping Driver with Translator and Overcurrent Protection

Benefits

For pole and desktop fans
Low audible noise and high-efficiency sinusoidal driver
Hall sensor feedback for reliable startup

Part Number	Output Voltage Range (V)	Output Current Range	Interface	Packages
A4984	8 to 35	2.0 A	Parallel (Translator)	QFN-24, QFN-32, eTSSOP-24

A4960 - Sensorless BLDC Controller

Benefits

Sensorless (No Hall sensors)
Programmable sensorless startup to fit wide variety of motors and loads

Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Interface	Packages
A4960	7 to 50	>10 A Typical	Three half bridges	Parallel (Translator)	eLQFP-32

Consumer

Small Footprint, Low Voltage Supply

Gaming	Robotic Vacuums

Power Tools	Lawn and Garden Tools

Featured Products: A3910 | A4953 | A4950 | A4915 | A4931

A3910 - Dual Half-Bridge Motor Driver

Benefits

For consumer gaming products
Can drive two DC motors
Low standby current for long battery life

Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Logic Supply Voltage Range	Packages
A3910	2.5 to 5.5	500 mA	Dual half	Internally generated	DFN-8

A4953 - Full-Bridge DMOS PWM Motor Driver

Benefits

For consumer gaming products
Overcurrent protection
Few external components
2 A output current

Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Logic Supply Voltage Range	Packages
A4953	8 to 40	2 A	Single full	Internally generated	SOICN-8

A4950 - Full-Bridge DMOS PWM Motor Driver

Benefits

For robotic vacuums
Few external components
3.5 A peak current to run on carpet and overcome obstacles

Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Logic Supply Voltage Range	Packages
A4950	8 to 40	3.5 A	Single full	Internally generated	SOICN-8

A4915 - 3-Phase MOSFET Driver

Benefits

Gate driver for high-power consumer products
Integrated Hall state machine
Unique analog voltage to duty cycle converter minimizes or eliminates the need for a microcontroller
Integrated sequencer for sensored motors

Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Interface	Packages
A4979	5 to 50	>10 A Typical	Three half bridges	Parallel	TSSOP-28, 5 × 5 mm QFN-28

A4931 - 3-Phase DC Motor Predriver

Benefits

For robotic vacuums
Integrated Hall state machine
Low standby-mode current

Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Interface	Packages
A4931	8 to 38	<10 A Typical	Three half bridges	Parallel	5 × 5 mm QFN-28

Selection Guide

Brushless DC Motor Pre-Drivers

MOSFET Gate Driver ICs
Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Interface	Packages
A4960	7 to 50	>10 A Typical	Three half bridges	Parallel and SPI	eLQFP-32
A4915	5 to 50	>10 A Typical	Three half bridges	Parallel	TSSOP-28, 5 × 5 mm QFN-28
A4931	8 to 38	<10 A Typical	Three half bridges	Parallel	5 × 5 mm QFN-28

Brush DC Motor Drivers

Low-Voltage Motor Drivers (Integrated MOSFET ICs)
Part Number	Output Voltage Range (V)	Output Current Range	Number of Bridges	Logic Supply Voltage Range	Packages
A3909	4 to 18	1 A	Dual full	Internally generated	SSOP-10, MSOP-10
A3906	2.5 to 9	1 A	Dual full	Internally generated	QFN-20
A3918	2.5 to 9	1 A	Single full	Internally generated	QFN-16
A3901	2.5 to 5.5	400 mA	Dual full	Internally generated	DFN-10
A3908	2.5 to 5.5	500 mA	Single full	Internally generated	DFN-8
A3910	2.5 to 5.5	500 mA	Dual full	Internally generated	DFN-8
MOSFET Gate Driver ICs
A4957	4.5 to 50	>10 A Typical	Single full	3 V to 5.5 V	QFN-16
Integrated MOSFET ICs
A3998	9 to 50	1.5 A	Dual full with Dual Regulators	3 V to 5.5 V	QFN-32
A4950	8 to 40	3.5 A	Single full	Internally generated	SOICN-8
A4952	8 to 40	2 A	Single full	Internally generated	MSOP-10
A4953	8 to 40	2 A	Single full	Internally generated	SOICN-8
A4954	8 to 40	2 A	Dual full	Internally generated	eTSSOP-16

Biopolor Stepper Motor Drivers

Step/Direction Interface
Part Number	Output Voltage Range (V)	Output Current Range	Interface	Packages
A4989	12 to 50	<10 A Typical (MOSFET gate driver IC)	Parallel (Translator)	TSSOP-38
A3981K	7 to 50	1.4 A	ParallelSPI (Translator)	eTSSOP-28
A4979	7 to 50	1.5 A	SPI/Parallel (Translator)	eTSSOP-28
A3987	8 to 35	1.5 A	Parallel (Translator)	eTSSOP-24
A4982	8 to 35	2.0 A	Parallel (Translator)	QFN-32, eTSSOP-24
A4983	8 to 35	2.0 A	Parallel (Translator)	QFN-28
A4984	8 to 35	2.0 A	Parallel (Translator)	QFN-24, QFN-32, eTSSOP-24
A4985	8 to 35	1.0 A	Parallel (Translator)	QFN-24, QFN-32, eTSSOP-24
A4988	8 to 35	2.0 A	Parallel (Translator)	QFN-28
Parallel Interface (I0, I1)
A3988	8 to 36	1.2 A	Parallel (I0, I1)	QFN-36, eLQFP-48
A4986	8 to 35	2.0 A	Parallel (I0, I1)	eTSSOP-24
A4987	8 to 35	1.0 A	Parallel (I0, I1)	QFN-24, eTSSOP-24
A3906	2.5 to 9	1.0 A	Parallel (I0, I1)	QFN-20
A3901	2.5 to 5.5	400 mA	Parallel (I0, I1)	DFN-10
Serial Interfacce
A4979	7 to 50	1.5 A	SPI/Parallel (Translator)	eTSSOP-28

Integrated Brushless DC Motor Drivers

Integrated MOSFET ICs
Part Number	Output Voltage Range (V)	Output Current Range	Interface	Packages
A4941*	4.5 to 20	1.25 A	PWM, FG	eTSSOP-16
A4942	5 to 16	1.45 A	PWM, FG	4 x 4 mm QFN-20

*Indicates high temperature option

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Motor Drivers

Motor Driver ICs

Overview

Security

Accurate Position, Low Power and Wide Voltage Range Solutions

A3988 - Quad DMOS Full Bridge PWM Motor Driver

A3901 - Dual Full-Bridge Low-Voltage Motor Driver

A3909 - Dual-Full Bridge Motor Driver

Printers

Large Portfolio of Stepper and DC Brush Motor Driver ICs

A4950 - Full-Bridge DMOS PWM Motor Driver

A4952 - Full-Bridge DMOS PWM Motor Driver

A4984 - DMOS Microstepping Driver with Translator and Overcurrent Protection

A4988 - DMOS Microstepping Driver with Translator and Overcurrent Protection

A4985 - DMOS Microstepping Driver with Translator and Overcurrent Protection

A3906 - Low-Voltage Stepper and Single/Dual DC Motor Driver

A4931 - 3-Phase DC Motor PreDriver

White Goods

Efficient, Low Audible Noise Performance

A3909 - Dual Full-Bridge Motor Driver

A4957 - Full-Bridge MOSFET Driver

A4979 - Microstepping Programmable Stepper Motor Driver with Stall Detect and Short-Circuit Protection

Industrial

Simplifies Design Implementation, Minimizes External Components, Wide Voltage, and Current Ranges

A4952 - Full-Bridge DMOS PWM Motor Driver

A3918 - Low-Voltage DC Motor Driver

A3901 - Dual Full-Bridge Low-Voltage Motor Driver

A4979 - Microstepping Programmable Stepper Motor Driver with Stall Detect and Short-Circuit Protection

A4984 - DMOS Microstepping Driver with Translator and Overcurrent Protection

A4960 - Sensorless BLDC Controller

Consumer

Small Footprint, Low Voltage Supply

A3910 - Dual Half-Bridge Motor Driver

A4953 - Full-Bridge DMOS PWM Motor Driver

A4950 - Full-Bridge DMOS PWM Motor Driver

A4915 - 3-Phase MOSFET Driver

A4931 - 3-Phase DC Motor Predriver

Selection Guide

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