Allegro MicroSystems, Inc.

100 Crowley Drive
Marlborough, MA 01752

Hall-Effect Switches feature latched digital output.

Models A3213 and A3214 micropower, omnipolar digital switches have nominal current consumption of 300 Ã-µA and 5 Ã-µA respectively, and operate from battery voltages of 2.4-5.5 V. Model A3212 for 2.5-3.5 V operation is offered in ultra-slim micro lead-frame package measuring 0.75 mm high x 2 mm long and 3 mm wide. All switches are suited to detection of open/closed positions in...

Controls & Controllers

Microstepping Motor Drivers feature built-in sequencer.

Series SLA706xM unipolar 2-phase, motor driver ICs include translator to operate unipolar stepper motors with simple step input. Drivers include PWM constant-current control method, with synchronous PWM chopping function for 2 phases of motor coils to prevent motor noise at hold and sleep modes. For Ã-½, Ã-¼, 1/8, and 1/16th microstepping, products include Models SLA7060M, SLA7061M, and...

Pre-Driver IC targets high-power automotive applications.

Model A3946 half-bridge IC provides 2 high-current gate-drive outputs capable of driving power N-channel MOSFETs. Internal charge pump for high side allows for DC operation of half bridge. Supplied in 16-lead SOIC with copper batwing power tabs, IC offers extended operating voltages of 7-60 V and operating temperatures of -40 to +135Ã-

Electrical Equipment & Systems

Integrated Circuit powers automotive and industrial motors.

Full-bridge, pre-driver Model A3940, suited for large, brush, DC motors, provides 4 gate-drive outputs capable of driving various N-Channel MOSFETs. Bootstrap capacitors provide above-battery supply voltage required for N-Channel FETs, while internal charge pump for high side allows for DC, 100% duty cycle, operation of bridge. PHASE and ENABLE input terminals are provided for controlling speed...

Controls & Controllers

Gate Driver controls 3-phase motors.

Model A3938 3-phase power MOSFET controller with high-current gate drive capability, drives discrete n-channel MOSFETs and supports motor supply voltages from 12-50 V. Unit integrates bootstrapped high-side driver, integrated PWM control logic, commutation logic, and synchronous rectification. Offered with selectable coast or dynamic braking options, product includes fixed off-time PWM current...

Sensors, Monitors & Transducers

Sensor detects tiny, symmetrical gear-tooth geometries.

Model ATS645 differential sensor is offered with 2-wire back-biased package, peak detecting algorithms, and automatic gain control. Digital detection of gear tooth edges provides true zero-speed, gear-tooth sensing. Product consists of single-shot molded plastic package containing single chip differential Halt-effect sensor IC, Samarium Cobalt magnet, and flat ferrous pole piece. Hall elements,...