AMT49701

AMT49701 Quad DMOS Full-Bridge PWM Motor Driver FEATURES AND BENEFITS 18 V output rating 4 full bridges Dual stepper motor driver High-current outputs 3.3 and 5 V compatible logic Synchronous rectification Internal undervoltage lockout (UVLO) Thermal shutdown circuitry Crossover-current protection Overcurrent protection Low-profile QFN package PACKAGE: Package EV, 36-pin QFN 0.90 mm nominal height with exposed thermal pad Not to scale DESCRIPTION The AMT49701 is a quad DMOS full-bridge driver capable of driving up to two stepper motors or four DC motors. Each full-bridge output is rated up to 1 A and 18 V. The AMT49701 includes fixed off-time pulse-width modulation (PWM) current regulators, along with 2- bit nonlinear DACs (digital-to-analog converters) 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, undervoltage lockout (UVLO) and crossover-current protection. Special power-up sequencing is not required. TheAMT49701 is supplied in the EV package, a 6  mm  ×  6  mm, 36-pin QFN package with a nominal overall package height of 0....