MTS2916A-LGC1

The MTS2916A motor driver is a CMOS device capable of driving both windings of a bipolar stepper motor or bidirectionally control two DC motors. Each of the two independent H-bridge outputs is capable of sustaining 40V and delivering up to 750 mA of continuous current. The output current level is controlled by an internal pulse-width modulation (PWM) circuit that is configured using two logic inputs, a current sense resistor and a selectable reference voltage. The H-bridge outputs have been optimized to provide a low output saturation voltage drop.

Full, half, and micro-stepping operations are possible with the PWM current control and logic inputs. The maximum output current is set by a sensing resistor and a user selectable reference voltage. The output current limit is selected using two logic level inputs. The selectable output current limits are 0%, 33%, 67%, or 100% of the maximum output current. Each bridge has a PHASE input signal which is used to control the direction of current flow through the H-bridge and the load.

The H-bridge power stage is controlled by non-overlapping signals which prevent current cross conduction when switching the direction of the current flow. Internal clamp diodes protect against inductive transients. Thermal protection circuitry disables the outputs when the junction temperature exceeds the safe operating limit. No special power-up sequencing is required. Undervoltage Lockout circuitry prevents the chip from operating when the load supply is applied prior to the logic supply.