AMT49700 Datasheet | Allegro MicroSystems

FEATURES AND BENEFITS - Peak motor current up to 1.6 A at 28 V. - Low RDS(ON) outputs, 0.5 Ω source and sink typical - Continuous operation at high ambient temperature - 3.7 to 42 V supply operation - Adaptive mixed current decay - Synchronous rectification for low power dissipation - Output slew control and PWM frequency spreading for EMC noise reduction - Internal overvoltage and undervoltage lockout - Hot warning and overtemperature shutdown - Short-circuit, open-load diagnostics - Programmable motion control - Configurable through serial interface - Simple step and direction control option APPLICATIONS - Automotive stepper motors - Engine management - Headlamp positioning - HVAC flap and valve control PACKAGE: 32-Pin QFN with Exposed Thermal Pad (suffix ET) DESCRIPTION The AMT49700 is a flexible microstepping stepper motor driver with integrated phase current control, a built-in translator, and simple motion control. It is a single chip solution designed to operate bipolar stepper motors in full, half, quarter, eighth and sixteenth step modes, at up to 28 V. The current regulator operates with fixed frequency PWM and uses adaptive mixed current decay to reduce audible motor noise and increase step accuracy. The current in each phase of the motor is controlled through a DMOS full-bridge using synchronous rectification to improve power dissipation. Internal circuits and timers prevent cross-conduction and shoot through when switching between high-side and low-side drives. The outputs are protected from short circuits and features for low load current detection are included. Chip level protection includes hot thermal warning, overtemperature shutdown, overvoltage lockout, and undervoltage lockout. The AMT49700 is fully controlled and configured through an SPI-patible serial interface. It provides single step control with adjustable microstep resolution for fine positioning control and programmable motion control providing independent motor acceleration,...