New PWM motor driver IC designed for under 18V supply voltage applications

Allegro MicroSystems has introduced a new quad DMOS full-bridge driver capable of driving up to two stepper motors or four DC motors. The AMT49701 was designed particularly for dual axis, office automation, point of sale, surveillance, security, IP cameras, as well as industrial automation applications. Each full-bridge output is rated up to 1A and 18V. This new driver combines fixed off-time PWM current regulators, along with 2-bit nonlinear 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 increased step accuracy, reduced motor noise, and reduced power dissipation. The driver is supplied in an EV package, a 6mm × 6mm, 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% matt-tin leadframe plating.