Allegro MicroSystems, Inc. Announces New Dual DMOS Full-Bridge Motor Driver and Dual Regulators

With Overcurrent Protection and Serial Port Control

June 5, 2012

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Worcester, MA – Allegro MicroSystems, Inc. announces a new integrated power IC that is designed to supply the motor driver and power supply requirements for office automation such as printers and scanners as well as industrial applications. Allegro’s A3998 incorporates two high current, high performance, DMOS full-bridge outputs that are capable of 1.5 A at 50 V. Additionally, two power supply rails are provided for microprocessor or DSP supplies. A switching buck regulator steps the supply down to an adjustable low voltage output from 3.3 to 5 V. This voltage can be used to supply external 3.3 V or 5 V rails and also feeds back into the part supplying the adjustable, integrated linear regulator from 1 V to 2.5 V.

The A3998 serial port provides flexible configuration for the dual full-bridge motor driver. Two full-bridges can be programmed to control one stepper motor or two DC motors. Both bridges have integrated fixed off-time PWM current control with programmable decay mode selection. Maximum output current is set by an external VREF input voltage, sense resistor and serial port controlled four bit DAC for each bridge. The four bit non-linear DAC can be programmed to produce up to 16 current levels for full, half, 1/4, 1/8 and 1/16 microstep per step resolution in stepper motor configurations.

Internal circuit protection includes: thermal shutdown with hysteresis, under voltage lockout (UVLO), over current and crossover-current protection.

The A3998SETTR-T is supplied in a low profile, 32-contact QFN, 5 × 5 mm, 0.90 mm nominal height, with exposed thermal pad (suffix ET) package. The package is lead (Pb) free with 100% matte-tin leadframe plating.

Über Allegro MicroSystems

Allegro MicroSystems Inc. ist ein führendes Unternehmen bei der Entwicklung, Fertigung und Vermarktung von leistungsfähigen Power- und Halleffekt-Sensor-ICs. Die innovativen Lösungen von Allegro zielen auf die Wachstumsmärkte in den Bereichen Automobilelektronik, Kommunikation, Computer/Büroautomatisierung, Konsumer- und Industrieelektronik. Allegro hat seinen Firmensitz in Worcester, MA, USA mit Design- und Applikationszentren in Nord- und Südamerika, Asien und Europe. Weitere Informationen findet man unter:

Allegro MicroSystems Europe hat seinen Firmensitz in Chertsey, Großbritannien, und stellt die europäische Vertriebs- und Marketing-Niederlassung dar. Von hier aus wird ein Netzwerk von Repräsentanten und Distributoren in Europa geführt. Allegro unterhält außerdem Applikations- und Marketingzentren in Heidelberg, Deutschland sowie in Annecy, Frankreich. Hinzu kommt ein Entwicklungszentrum in Edinburgh, Schottland.


Allegro MicroSystems Germany GmbH
Tel: +49 (0) 6221 8723 5


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