STMicroelectronics has made available high power density fully integrated stepper-motor driver system-in-package with power density of up to 500W/cm2.
14mm x 11mm measuring System-in-Package need lesser external components and it integrates both the control circuitry and a complete power stage for driving the motor. ST says it is the first such highly integrated device suited to high-power applications up to 85V and 10A, significantly extending the scope of motor-control ICs used in industrial applications like automated machinery, industrial sewing machines, stage lighting, surveillance systems, and home automation.
The power stage consists of eight MOSFETs with low internal resistance (RDS(ON)) of just 16milli ohms typical, which maximizes energy efficiency and minimizes heat dissipation to simplify thermal management. The integrated control IC includes an intelligent motion engine to perform calculations normally executed in the main system microcontroller, which gives engineers extra freedom when selecting the microcontroller, and helps simplify software and firmware design, says ST.
ST’s patented voltage-mode motor control allows smooth and quiet motion with high position accuracy, or to use an advanced current-mode with predictive control and adaptive decay algorithm when required. Resolution of 128 microsteps per step is comparable with the best stepper-motor controllers being used today, according to ST.
SPI interface allows convenient programming, and current-sense management and sensorless stall detection.
The POWERSTEP01 is in full production now, in the 14mm x 11mm VFQFN package priced from $4.50 for orders of 1000 pieces. The associated EVLPOWERSTEP01 evaluation board is also available to assist advanced application design.