A4985 - Allegro

A4985 DMOS Microstepping Driver

The A4985 is a complete microstepping motor driver with built-in translator for easy operation. It is designed to operate bipolar stepper motors in full-, half-, quarter-, and eighth-step modes. Step modes are selectable by MSx logic inputs. It has an output drive capacity of up to 35 V and ±1 A. The A4985 includes a fixed off-time current regulator which ha.

Features

▪ Low RDS(ON) outputs ▪ Automatic current decay mode detection/selection ▪ Mixed and Slow current decay modes ▪ Synchronous rectification for low power dissipation ▪ Internal UVLO ▪ Crossover-current protection ▪ 3.3 and 5 V compatible logic supply ▪ Thin profile QFN and TSSOP packages ▪ Thermal shutdown circuitry ▪ Short-to-ground protection ▪ Shorted load protection ▪ Low current Sleep mode, < 10 µA ▪ No smoke no fire (NSNF) compliance (ET package) PACKAGES: 24-contact QFN with exposed thermal pad 4 mm × 4 mm × 0.75 mm (ES package) 32-contact QFN with exposed thermal pad 5 mm × 5 mm × 0.90.