Allegro announces new dual, full-bridge PWM motor driver IC

by K C Krishnadas, TechOnline India - January 28, 2012

It will make for a significant reduction in the quiescent and switching power losses

Allegro MicroSystems has announced a new dual, full-bridge PWM motor driver IC aimed at the office automation, automotive, industrial and consumer markets. Allegro’s A4970 motor driver IC utilizes a DMOS output technology that drives both windings of a bipolar stepper motor or bidirectionally controls two DC motors. Both bridges are capable of sustaining 45 V and include internal pulse-width modulation (PWM) control of the output current to 750 mA.

For PWM current control, the maximum output current is determined by user selection of a reference voltage and sensing resistor. Two logic-level inputs select output current limits of 0%, 33%, 67%, or 100% of the maximum level. A PHASE input to each bridge determines load current direction.

The device is supplied in a 24-pin surface-mount wide SOIC with two pairs of batwing leads (LB). The webbed-pin construction provides for maximum package power dissipation in the smallest possible construction. The package is lead (Pb) free, with 100% matte tin leadframe plating. 

The A4970SLBTR-T is priced at $2.08 and the A4970GLBTR-T is priced at $2.29 – both prices are stated in quantities of 1,000.
 

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