Allegro MicroSystems Europe introduces quad full-bridge PWM motor driver IC
A quad DMOS full-bridge driver capable of driving up to two stepper motors or four DC motors has been announced by Allegro MicroSystems Europe. The AMT49701 was designed specifically for dual axis, point of sale, office automation, security, surveillance, IP cameras, as well as industrial automation applications.
Each full-bridge output is rated up to 1.0A and 18V. The AMT49701 driver includes fixed off-time pulse-width modulation (PWM) current regulators, along with two-bit non-linear DACs that allow stepper motors to be controlled in full, half, and quarter steps, and DC motors in forward, reverse, and coast modes. The PWM current regulator uses the Allegro patented mixed decay mode for reduced audible motor noise, increased step accuracy, and reduced power dissipation.
Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation. Protection features include thermal shutdown with hysteresis, under-voltage lockout (UVLO) and crossover-current protection. Special power-up sequencing is not required.
The AMT49701 is supplied in an EV package, a 6.0 x 6.0mm, 36-pin QFN package with a nominal overall package height of 0.9mm, and with an exposed thermal pad for enhanced thermal performance. The package is lead (Pb) free, with 100 per cent matt-tin leadframe plating.
Allegro MicroSystems develops, manufactures and markets high-performance semiconductors, serving high-growth applications within the automotive market, with additional focus on office automation, industrial, and consumer/communications solutions. Allegro is headquartered in Worcester, Massachusetts (USA) with design, applications, and sales support centres located worldwide.
Allegro MicroSystems Europe, headquartered in Chertsey, United Kingdom, is the European sales and marketing operation, and operates a network of representatives and distributors throughout Europe. Allegro has a technical and marketing centre in Heidelberg in Germany. Allegro also has an engineering design centre in Edinburgh in Scotland and a technical and marketing centre in Annecy in France.
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