STMicroelectronics – World’s smallest motor drivers boost run-time of battery-powered devices

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STMicroelectronics has launched the STSPIN series of tiny, single-chip motor drivers which combine low power consumption, a small form factor and outstanding performance.

Measuring just 3mm x 3mm, ST’s new devices are the world’s smallest single-chip motor drivers to integrate both the logic and power functions required to drive small, battery- powered motors. At its launch, the series is comprised of:

• the STSPIN220, which can drive stepper motors at a resolution of 256 microsteps per step, enabling extremely smooth motion and fine positional accuracy
• the STSPIN230 three-phase brushless DC (BLDC) motor driver
• the STSPIN240, which has two complete on-chip MOSFET bridges for driving two brushed DC motors

They operate from a supply voltage as low as 1.8V, and feature an ultra-low stand-by current of less than 80nA, effectively offering a zero-power state when the motor is inactive, as the device will run on battery leakage current.

The STSPIN parts still have ample ability to meet peak motor-power requirements, supplying up to 1.3Arms to drive the motor. The power stage of the STSPIN devices features efficient integrated MOSFETs which minimise energy losses and heat dissipation.

In addition, all devices benefit from comprehensive built-in protection features including over-current, over-temperature, and short-circuit protection.

FEATURES

  • Operating-voltage range: 1.8V to 10V
  • 0.4Ω combined high-side and low-side on-resistance
  • 1μA maximum leakage current
  • Current control with programmable off-time
  • 2kV ESD protection on the human body model

APPLICATIONS

  • Portable medical pumps and drivers
  • Personal wellness devices
  • Portable point-of-sale devices
  • Miniature robots
  • Surveillance equipment
  • Precision tools
  • Portable printers
  • Robotic positioning systems
  • Camera auto-focus mechanisms
  • Toothbrush motors

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