A4985SESTR-T Datasheet PDF - Allegro MicroSystems

●Description

●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 has the ability to operate in Slow or Mixed decay modes.

●The ET package meets customer requirements for no smoke no fire (NSNF) designs by adding no-connect pins between critical output, sense, and supply pins. So, in the case of a pin-to-adjacent-pin short, the device does not cause smoke or fire. Additionally, the device does not cause smoke or fire when any pin is shorted to ground or left open.

●Features and Benefits

●▪ 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)